Patent Application
20240252657
The present invention relates to the technical field of biological medicine, and particularly to a heat shock protein 90 (HSP90)-mediated targeting chimera (HEMTAC) small-molecule degradation agent and an application thereof.
Information disclosed in the background section is merely for the purpose of facilitating the understanding of the general background of the present invention and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes prior art that is already known to those of ordinary skill in the art.
In the continuous exploration of pharmaceutical chemistry, new strategies for targeting disease kinesins are constantly being developed. The targeted protein degradation strategy induced by small molecules is the most noteworthy strategy in recent years. This strategy can target inactive sites or undruggable protein targets, making it possible to degrade any protein. At present, the main degradation technologies are proteolysis-targeting chimeras (PROTACs), lysosome-targeting chimeras (LYTACs) and antibody-based PROTACs (AbTACs). The candidate drugs ARV-110 and ARV-471 related to the PROTAC technology have entered the phase II clinical trial. The PROTAC technology is mainly suitable for intracellular proteins, while the LYTAC and AbTAC technologies can degrade exocrine proteins and membrane proteins. Protein degradation technologies have shown great potential in targeting undruggable targets and disease treatment.
Although the emergence of these novel degradation technologies can overcome the limitations of small molecule inhibitors, the emerging degradation technologies also have some limitations, which may lead to the degradation of targeted proteins that are not involved in the disease process in many tissues and organs, resulting in serious side effects in the treatment process. In addition, small molecule PROTAC plays its degradation role by “hijacking” E3 ligase. However, studies have shown that small molecule PROTAC based on VHL and CRBN can cause an off-target effect and drug resistant mechanism in cells. Therefore, it is urgent to expand the scope of targeted degradation technology and develop novel protein degradation technologies.
The heat shock protein 90 (HSP90) family is an ATP-dependent chaperone with a molecular weight of about 90 kDa. HSP90 exists in cells in the form of dimers. The dimerization of HSP90 is necessary for its intracellular function. The expression of HSP90 in the non-stressed state accounts for about 1% to 2% of the total intracellular protein, and is thousands of times the average content of protein. Under stress conditions, the content of HSP90 can increase to 4% to 6% of the total intracellular protein. In human cells, HSP90 protein is classified into HSP90α (inducible type) and HSP90β (constitutive type). The expression of HSP90α increases after heat induction, and is related to the maintenance of cell homeostasis under pressure. HSP90β can be expressed continuously, is indispensable in mammals, and is related to the life activities of mammals.
As an important molecular chaperone, HSP90 can activate different substrate proteins, and therefore participate in the regulation of various life activities. In order to make proteins perform their normal biological functions, molecular chaperones can activate newly synthesized proteins, assemble and depolymerize molecular complexes, help abnormally folded proteins refold, and coordinate with the ubiquitin-proteasome system to regulate and degrade misfolded proteins. In addition, it is found through research that heat shock protein family is closely related to tumors, the expression of HSP90 is abnormally increased in tumor cells induced by some oncogenes and their products, and HSP90 participates in tumor growth, invasion, and metastasis.
An objective of the present invention is to provide a HEMTAC small molecule degradation agent for inducing targeted protein degradation based on HSP90 and an application thereof. According to the characteristics that HSP90 has stable client protein, can degrade error protein by the ubiquitin-proteasome system, and has high expression in tumor cells, the present invention designs and develops a novel protein degradation technology, which is named as heat shock protein 90 (HSP90)-mediated targeting chimeras (HEMTACs). Based on the above research results, the present invention is attained.
The following technical solution is adopted in the present invention.
According to a first aspect of the present invention, a compound is provided, having a structure of formula (I) below:
The above compound is actually a heat shock protein 90 (HSP90)-mediated targeting chimeras (HEMTACs) small molecule degradation agent.
The small molecule HEMTACs includes three parts: a ligand bound to the targeted protein, a linker, and a ligand bound to HSP90. The linker connects the two ligands to form the small molecule HEMTACs. Similar to the PROTAC technology, the small molecule HEMTACs can induce formation of an HSP90-HEMTAC-targeted protein ternary complex, the targeted protein is spatially positioned at a position which is beneficial for being mistakenly recognized as an “abnormal” protein by the HSP90, is then introduced into a ubiquitin-proteasome system, and causes degradation of the targeted protein. HEMTACs are released to participate in the next degradation cycle. Therefore, the small molecule HEMTACs have a catalytic effect in targeted protein ubiquitin induction and degradation.
The targeted protein includes, but is not limited to, kinases, a G protein-coupled receptor, a transcription factor, phosphatase, and a member of the RAS superfamily.
Therefore, R1 is selected from compounds targeting the following: kinases, a G protein-coupled receptor, a transcription factor, phosphatase, and a member of the RAS superfamily.
Specifically, R1 is Palbociclib.
R2 is a ligand BIIB021 of HSP90 or a derivative thereof.
The compound further includes pharmaceutically acceptable salts, stereoisomers, esters, prodrugs, solvates, and deuterated compounds thereof.
According to a second aspect of the present invention, an application of the compound in preparing drugs for tumors, inflammation, and immune-related diseases.
Further, the diseases may also be diseases associated with cell cycle dependent protein kinases 4 and 6 (CDK4/6).
According to a third aspect of the present invention, a pharmaceutical composition is provided, including the above compound.
According to a fourth aspect of the present invention, a pharmaceutical preparation is provided, including the above compound and at least one pharmaceutically acceptable pharmaceutically inactive ingredient.
It is obvious that the pharmaceutical composition or pharmaceutical preparation can be used for the treatment of tumors, inflammation, immune-related diseases, especially, diseases associated with CDK4/6.
According to a fifth aspect of the present invention, a method of treating tumors, inflammation, and immune-related disease is provided. The method includes administering to a subject a therapeutically effective amount of the above compound, pharmaceutical composition, or pharmaceutical preparation.
The one or more technical solutions described above have the following technical effects:
The above technical solutions report for the first time a HEMTAC small molecule degradation agent for inducing targeted protein degradation based on HSP90 and an application thereof. It is found through research in the present invention that the HEMTAC small-molecule degradation agent can induce formation of an HSP90-HEMTAC-targeted protein ternary complex, the targeted protein is spatially positioned at a position which is beneficial for being mistakenly recognized as an “abnormal” protein by the HSP90, is then introduced into a ubiquitin-proteasome system, and causes degradation of the targeted protein. HEMTACs are released to participate in the next degradation cycle. Therefore, the HEMTACs have a catalytic effect in targeted protein ubiquitin induction and degradation, can be used for treating diseases related to tumors, inflammations, immunity and the like, and have a good prospect for practical application.
The drawings forming a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments and description of the present invention are used to explain the present invention but do not constitute an improper limitation on the present invention.
It should be noted that the following detailed description is exemplary and is intended to provide a further description of the present invention. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise indicated.
It is to be noted that the terminology used herein is for the purpose of describing particular embodiments, and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular terms are also intended to include the plural, and it is also to be understood that when the terms “include” and/or “comprise” are used in the specification, they indicate the presence of features, steps, operations, devices, components, and/or combinations thereof, unless otherwise indicated.
The present invention will be described in further detail with reference to specific examples. The following examples are illustrative of the present invention and the present invention is not limited thereto. Where no specific experimental conditions are given in the examples, conventional conditions or conditions recommended by reagent manufacturers are followed. The reagents and materials used in examples below are all commercially available, unless it is otherwise stated.
In a typical exemplary embodiment of the present invention, a compound is provided, having a structure of formula (I) below:
The above compound is actually a heat shock protein 90 (HSP90)-mediated targeting chimeras (HEMTACs) small molecule degradation agent. The small molecule HEMTACs includes three parts: a ligand bound to the targeted protein, a linker, and a ligand bound to HSP90. The linker connects the two ligands to form the small molecule HEMTACs. Similar to the PROTAC technology, the small molecule HEMTACs can induce formation of an HSP90-HEMTAC-targeted protein ternary complex, the targeted protein is spatially positioned at a position which is beneficial for being mistakenly recognized as an “abnormal” protein by the HSP90, is then introduced into a ubiquitin-proteasome system, and causes degradation of the targeted protein. HEMTACs are released to participate in the next degradation cycle. Therefore, the small molecule HEMTACs have a catalytic effect in targeted protein ubiquitin induction and degradation.
The targeted protein includes, but is not limited to, kinases, a G protein-coupled receptor, a transcription factor, phosphatase, and a member of the RAS superfamily.
Therefore, R1 is selected from compounds targeting the following: kinases, a G protein-coupled receptor, a transcription factor, phosphatase, and a member of the RAS superfamily.
Specifically, R1 is Palbociclib.
R2 is a ligand BIIB021 of HSP90 or a derivative thereof.
The general formula of the ligand BIIB021 of HSP90 or the derivative thereof is as follows:
In another exemplary embodiment of the present invention, the compound includes any one or more of:
In another exemplary embodiment of the present invention, the compound further includes pharmaceutically acceptable salts, stereoisomers, esters, prodrugs, solvates, and deuterated compounds thereof.
In another exemplary embodiment of the present invention, an application of the compound in preparing drugs for tumors, inflammation, and immune-related diseases.
In another exemplary embodiment of the present invention, the diseases may also be diseases associated with cell cycle dependent protein kinases 4 and 6 (CDK4/6).
In another exemplary embodiment of the present invention, a pharmaceutical composition is provided, including the above compound. The pharmaceutical composition can be used alone or in combination with other kinds of drugs for treating diseases such as tumors, inflammation, immunity, etc.
In another exemplary embodiment of the present invention, a pharmaceutical preparation is provided, including the above compound and at least one pharmaceutically acceptable pharmaceutically inactive ingredient.
The pharmaceutically inactive ingredient can be a carrier, an excipient, a diluent, etc. commonly used in pharmacy. Moreover, according to commonly used methods, the pharmaceutical preparation can be prepared into oral preparations such as powder, granule, tablet, capsule, suspension, emulsion, syrup and spray, external preparations, suppositories and sterile injection solutions for use.
The pharmaceutically inactive ingredient such as a carrier, an excipient, and a diluent that may be contained is well known in the art and can be determined by those of ordinary skill in the art to meet clinical standards.
In another exemplary embodiment of the present invention, the carrier, excipient and diluent include, but are not limited to, lactose, glucose, sucrose, sorbitol, mannitol, xylitol, erythritol, maltitol, starch, acacia, alginate, gelatin, calcium phosphate, calcium silicate, cellulose, methyl cellulose, microcrystalline cellulose, polyvinylpyrrolidone, water, methyl hydroxybenzoate, propyl hydroxybenzoate, talc powder, magnesium stearate and mineral oil.
In another exemplary embodiment of the present invention, the pharmaceutical preparation of the present invention can be administered to a body in a known manner. For example, the pharmaceutical preparation is delivered to a tissue of interest by intravenous systemic delivery or local injection. Optionally, the pharmaceutical preparation is administered via intravenous, percutaneous, intranasal, mucosal, or other means of delivery. Such administration can be performed via a single dose or multiple doses. It will be understood by those skilled in the art that the actual dose to be administered in the present invention may vary to a large extent depending on a number of factors, such as the target cell, the biological type or tissue thereof, the general condition of the subject to be treated, the route of administration, the mode of administration, and the like.
In another exemplary embodiment of the present invention, the pharmaceutical preparation can be administered to humans and non-human mammals, such as mice, rats, guinea pigs, rabbits, dogs, monkeys, orangutans, etc.
It is obvious that the pharmaceutical composition or pharmaceutical preparation can be used for the treatment of tumors, inflammation, immune-related diseases, especially, diseases associated with CDK4/6.
According to a fifth aspect of the present invention, a method of treating tumors, inflammation, and immune-related disease is provided. The method includes administering to a subject a therapeutically effective amount of the above compound, pharmaceutical composition, or pharmaceutical preparation.
The subject refers to an animal, preferably a mammal, most preferably a human, which has been the subject of treatment, observation or experiment.
The “therapeutically effective amount” refers to an amount of an active compound or agent, including the compound of the present invention, that elicits a biological or medical response of the tissue system, animal or human that is expected by a researcher, veterinarian, physician or other medical personnel. The biological or medical response includes alleviating or partially alleviating the symptoms of the disease, syndrome, disorder or condition under treatment.
Researchers, veterinarians, physicians or other medical personnel in the art may learn of the range of the therapeutically effective amount available from clinical trials or other means well known in the art.
The present invention is further illustrated through examples below; however the present invention is not limited thereto. It is to be understood that these examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention. In examples below where no specific conditions are given in the experimental methods, conventional conditions are usually followed.
Compound 1 (2 g, 11.86 mmol, 1.0 equiv.) was dissolved in 20 mL of pyridine. Then trimethyl acetyl chloride (4.45 mL, 35.59 mmol, 3 equiv.) was added and stirred overnight at room temperature to give a mixture of N(2) monoacylation and N(2),N(7) diacylation. The solvent was rotary dried. The residue was dissolved in a mixture of ammonia (25% NH3, 5 mL) and methanol (20 mL), and stirred at room temperature for 30 minutes, to selectively disconnect the neovaleryl group at N(7) position. The solid was filtered. The filter cake was washed with water (10 mL×3), and vacuum dried to obtain 2.55 g of Compound 2, yellow solid, with a yield of 85%. 1H NMR (400 MHz, DMSO-d6) δ 12.32 (s, 1H), 10.01 (s, 1H), 7.54 (d, J=3.6 Hz, 1H), 6.53 (d, J=3.5 Hz, 1H), 1.24 (s, 9H). ESI-MS: m/z [M+H]+ calculated for C11H14ClN4O+ 253.09, found 253.06.
Compound 2 (200 mg, 791.45 μmol, 1.0 equiv.) was dissolved in dry tetrahydrofuran (10 mL). Then N-iodosuccinimide (213.68 mg, 949.74 μmol, 1.2 equiv.) was added under the protection of N2. he mixture was reacted at room temperature for 1 hour. The solvent was rotary dried. The residue was dissolved in dichloromethane (60 mL), and washed with saturated Na2S2O3 solution (40 mL×3) and brine (30 mL×3). The organic layer was dried over anhydrous Na2SO4. The organic solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography (dichloromethane/methanol=60:1 to 30:1) to obtain 260 mg of Compound 3, brown solid, with a yield of 87%. 1H NMR (400 MHz, DMSO-d6) δ 12.69 (s, 1H), 10.09 (s, 1H), 7.77 (d, J=1.2 Hz, 1H), 1.23 (s, 9H). ESI-MS: m/z [M−H]− calculated for C11H11ClIN4O− 376.97, found 377.08.
Compound 3 (255 mg, 673.54 μmol, 1.0 equiv.), Compound 4 (157.08 mg, 707.21 μmol, 1.1 equiv.) and K2CO3 (279.26 mg, 2.02 mmol, 3.0 equiv.) were dissolved in dry DMF (5 mL) and stirred at room temperature for 24 hours. The reaction solution was added dropwise to a mixed solution of water (15 mL) and isopropanol (15 mL). The solid was filtered. The filter cake was washed with water (15 mL), and vacuum dried to obtain 323 mg of Compound 5, white solid, with a yield of 91%. 1H NMR (400 MHz, DMSO-d6) δ 10.14 (s, 1H), 8.05 (s, 1H), 7.73 (s, 1H), 5.46 (s, 2H), 3.74 (s, 3H), 2.33 (s, 3H), 2.16 (s, 3H), 1.21 (s, 9H). ESI-MS: m/z [M+H]+ calculated for C20H24ClIN5O2+ 528.07, found 528.31.
Compound 5 (2.0 g, 3.79 mmol, 1.0 equiv.) was dissolved in a mixed solvent of ethanol/water (20:1, 42 mL). Then ZnCl2 (2.58 g, 18.95 mmol, 5.0 equiv.) was added to the reaction solution, heated to 80° C. and stirred for 20 hours. The reaction solution was cooled to room temperature, and poured into water (50 mL). The solid was filtered. The filter cake was washed with water (10 mL×3), and vacuum dried to obtain 1.44 g of Compound 6, white solid, with a yield of 86%. 1H NMR (400 MHz, DMSO-d6) δ 8.07 (s, 1H), 7.26 (s, 1H), 6.71 (s, 2H), 5.29 (s, 2H), 3.73 (s, 3H), 2.26 (s, 3H), 2.17 (s, 3H). ESI-MS: m/z [M+H]+ calculated for C15H16ClIN5O+ 444.01, found 444.11.
Compound 6 (1.0 g, 2.25 mmol, 1.0 equiv.), CuI (42.93 mg, 225.39 μmol, 0.1 equiv.), PPh3 (59.12 mg, 225.39 μmol, 0.1 equiv.), 10% Pd/C (66.73 mg, 56.35 μmol, 0.025 equiv.), and K2CO3 (342.65 mg, 2.48 mmol, 1.1 equiv.) were dissolved in a mixed solvent of DMF (12 mL) and water (4 mL). 3-butynyl toluenesulfonate dissolved in DMF (4 mL) was added dropwise to the reaction solution under the protection of N2. The reaction solution was heated to 75° C. and stirred for 3 hours. The reaction solution was filtered with diatomite. The diatomite was washed with ethyl acetate. Then the filtrate was diluted with 100 mL of ethyl acetate. The organic phase was washed with water (40 mL×3) and brine (40 mL×3) and dried over anhydrous Na2SO4. The organic solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography (petroleum ether/ethyl acetate=1:1 to 1:3) to obtain 700 mg of Compound 7, white solid, with a yield of 74%. 1H NMR (400 MHz, DMSO-d6) δ 8.10 (s, 1H), 7.80 (d, J=7.7 Hz, 2H), 7.41 (d, J=7.6 Hz, 2H), 7.28 (s, 1H), 6.75 (s, 2H), 5.31 (s, 2H), 4.14 (t, J=5.1 Hz, 2H), 3.73 (s, 3H), 2.77 (t, J=5.1 Hz, 2H), 2.33 (s, 3H), 2.27 (s, 3H), 2.17 (s, 3H). ESI-MS: m/z [M+H]+ calculated for C26H27ClN5O4S+ 540.15, found 540.13.
Compound 7 (406 mg, 751.80 μmol, 1.0 equiv.) was dissolved in DMF (8 mL). Then NaN3 (146.63 mg, 2.26 mmol, 3.0 equiv.) was added to the reaction solution. The reaction solution was heated to 60° C. and stirred for 4 hours. After cooling to room temperature, the reaction solution was poured into water, and extracted with ethyl acetate three times (40 mL×3). The organic phases were combined, washed with water and brine, and dried over anhydrous Na2SO4. The organic solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography (petroleum ether/ethyl acetate=1:1 to 1:3) to obtain 290 mg of Compound 8, white solid, with a yield of 94%. 1H NMR (400 MHz, DMSO-d6) δ 8.06 (s, 1H), 7.28 (s, 1H), 6.71 (s, 2H), 5.29 (s, 2H), 3.73 (s, 3H), 3.51 (t, J=6.5 Hz, 2H), 2.72 (t, J=6.5 Hz, 2H), 2.25 (s, 3H), 2.17 (s, 3H). ESI-MS: m/z [M+H]+ calculated for C19H20ClN8O+ 411.14, found 411.03.
Compound 8 (810 mg, 1.97 mmol, 1.0 equiv.) was dissolved in a mixed solvent of tetrahydrofuran (30 mL) and water (2 mL). Then PPh3 (1.55 g, 5.91 mmol, 3.0 equiv.) was add to the reaction solution, and stirred overnight at room temperature. The solvent was rotary dried. The crude product was purified by silica gel column chromatography (dichloromethane/methanol=30:1 to 5:1) to obtain 480 mg of Compound 9, white solid, with a yield of 63%. 1H NMR (400 MHz, DMSO-d6) δ 8.06 (s, 1H), 7.30 (s, 1H), 6.73 (s, 2H), 5.28 (s, 2H), 3.73 (s, 3H), 2.92 (t, J=6.9 Hz, 2H), 2.65 (t, J=7.0 Hz, 2H), 2.25 (s, 3H), 2.16 (s, 3H), 1.23 (s, 2H). ESI-MS: m/z [M+H]+ calculated for C19H22ClN6O+ 385.15, found 385.10.
Compound 10 (150 mg, 335.16 μmol, 1.0 equiv.) and propargic acid (30.95 μL, 502.74 μmol, 1.5 equiv.) were dissolved in dichloromethane (15 mL). Then HATU (156.05 mg, 402.20 μmol, 1.2 equiv.) and DIPEA (169.58 μL, 1.01 mmol, 3.0 equiv.) were added to the suspension, and stirred at room temperature for 3 hours. The reaction solution was diluted with 100 mL of dichloromethane, and washed with water and brine. The organic phases were dried over anhydrous Na2SO4. The organic solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography (dichloromethane/methanol=70:1 to 40:1) to obtain 105 mg of Compound 11, yellow solid, with a yield of 63%. 1H NMR (400 MHz, DMSO-d6) δ 10.15 (s, 1H), 8.96 (s, 1H), 8.09 (d, J=2.7 Hz, 1H), 7.90 (d, J=9.0 Hz, 1H), 7.52 (dd, J=9.1, 2.7 Hz, 1H), 5.94-5.77 (m, 1H), 4.62 (s, 1H), 3.96-3.79 (m, 2H), 3.75-3.60 (m, 2H), 3.32-3.20 (m, 2H), 3.21-3.06 (m, 2H), 2.43 (s, 3H), 2.31 (s, 3H), 2.29-2.14 (m, 2H), 2.00-1.84 (m, 2H), 1.85-1.69 (m, 2H), 1.68-1.50 (m, 2H). ESI-MS: m/z [M+H]+ calculated for C27H30N7O3+ 500.24, found 500.17.
Compound 10 (1.0 g, 2.23 mmol, 1.0 equiv.) was dissolved in DMF (15 mL). Then tert-butyl bromoacetate (398.86 μL, 2.68 mmol, 1.2 equiv.) and DIPEA (1.13 mL, 6.70 mmol, 3.0 equiv.) were successively added to the reaction solution, and stirred overnight at room temperature. Then the reaction solution was poured into water (50 mL). The solid was filtered. The filter cake was washed with water (30 mL), and vacuum dried to obtain 1.2 g of Compound 12, yellow solid, with a yield of 95%. 1H NMR (400 MHz, CDCl3) δ 8.82 (s, 1H), 8.23 (s, 1H), 8.15 (d, J=9.1 Hz, 1H), 8.06 (d, J=2.8 Hz, 1H), 7.32 (dd, J=9.1, 2.9 Hz, 1H), 5.88 (p, J=8.9 Hz, 1H), 3.34-3.22 (m, 4H), 3.20 (s, 2H), 2.92-2.64 (m, 4H), 2.55 (s, 3H), 2.41-2.30 (m, 5H), 2.11-2.02 (m, 2H), 1.92-1.84 (m, 2H), 1.74-1.67 (m, 2H), 1.49 (s, 9H). ESI-MS: m/z [M+H]+ calculated for C30H40N7O4+ 562.31, found 562.25.
Compound 12 (1.0 g, 1.78 mmol, 1.0 equiv.) was dissolved in a mixed solvent of trifluoroacetic acid (5 mL) and dichloromethane (5 mL) and stirred at room temperature for 2 hours. Most of the solvent in the reaction solution was rotary dried. A small amount of toluene was added and then rotary dried. This operation was repeated many times until the residual trifluoroacetic acid was removed. The crude product was directly used for the next reaction without further purification.
Compound 13 (255 mg, 504.37 μmol, 1.0 equiv.) was dissolved in dry dichloromethane (20 mL). Then propargyl amine (49.44 μL, 756.56 μmol, 1.5 equiv.), HATU (287.67 mg, 757.5 μmol, 1.5 equiv.) and DIPEA (448.24 μl, 2.52 mmol, 5.0 equiv.) were successively added to the reaction solution, and stirred at room temperature for 5 hours. The reaction solution was diluted with 100 mL of dichloromethane, and washed with water and brine. The organic phases were dried over anhydrous Na2SO4. The organic solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography (dichloromethane/methanol=60:1 to 30:1) to obtain 185 mg of Compound 14, yellow solid, with a yield of 68%. 1H NMR (400 MHz, DMSO-d6) δ 10.09 (s, 1H), 8.95 (s, 1H), 8.20 (t, J=5.7 Hz, 1H), 8.06 (d, J=2.7 Hz, 1H), 7.85 (d, J=9.0 Hz, 1H), 7.48 (dd, J=9.1, 2.8 Hz, 1H), 5.89-5.76 (m, 1H), 3.89 (dd, J=5.7, 2.3 Hz, 2H), 3.21 (t, 4H), 3.07 (t, J=2.3 Hz, 1H), 3.02 (s, 2H), 2.60 (t, 4H), 2.42 (s, 3H), 2.31 (s, 3H), 2.28-2.14 (m, 2H), 1.97-1.82 (m, 2H), 1.82-1.68 (m, 2H), 1.65-1.50 (m, 2H). ESI-MS: m/z [M+H]+ calculated for C29H35N8O3− 543.28, found 543.22.
Compound 13 (257 mg, 508.33 μmol, 1.0 equiv.) was dissolved in dry dichloromethane (20 mL). Then N-tert-butoxycarbonyl-1,2-ethylenediamine (97.73 mg, 609.99 μmol, 1.2 equiv.), HATU (231.94 mg, 609.99 μmol, 1.2 equiv.) and DIPEA (451.76 μL, 2.54 mmol, 5.0 equiv.) were successively added to the reaction solution, and stirred overnight at room temperature. The reaction solution was diluted with 100 mL of dichloromethane, and washed with water and brine. The organic phases were dried over anhydrous Na2SO4. The organic solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography (dichloromethane/methanol=60:1 to 30:1) to obtain 243 mg of Compound 15, yellow solid, with a yield of 74%. 1H NMR (400 MHz, DMSO-d6) δ 10.10 (s, 1H), 8.96 (s, 1H), 8.06 (d, J=2.8 Hz, 1H), 7.96-7.73 (m, 2H), 7.47 (dd, J=9.1, 2.8 Hz, 1H), 6.86 (t, J=5.3 Hz, 1H), 5.88-5.77 (m, 1H), 3.29-3.11 (m, 6H), 3.08-2.90 (m, 4H), 2.61 (s, 4H), 2.43 (s, 3H), 2.32 (s, 3H), 2.29-2.18 (m, 2H), 1.95-1.84 (m, 2H), 1.83-1.72 (m, 2H), 1.64-1.55 (m, 2H), 1.38 (s, 9H). ESI-MS: m/z [M+H]+ calculated for C33H46N9O5+ 648.36, found 648.18.
According to the synthesis method of Compound 15, Compound 13 (166.52 mg, 329.36 μmol, 1.0 equiv.) and tert-butyl 2-(2-(2-aminoethoxy)ethoxy)ethylcarbamate (82.38 mg, 395.24 μmol, 1.2 equiv.) were used as raw materials to obtain 150 mg of Compound 16, yellow solid, with a yield of 66%. 1H NMR (400 MHz, DMSO-d6) δ 10.10 (s, 1H), 8.96 (s, 1H), 8.07 (d, J=2.6 Hz, 1H), 7.85 (d, J=9.1 Hz, 1H), 7.80 (s, 1H), 7.48 (dd, J=9.0, 2.6 Hz, 1H), 6.77 (t, J=4.9 Hz, 1H), 5.87-5.75 (m, 1H), 3.48-3.38 (m, 4H), 3.31-3.18 (m, 6H), 3.11-2.94 (m, 4H), 2.63 (s, 4H), 2.43 (s, 3H), 2.31 (s, 3H), 2.29-2.18 (m, 2H), 1.95-1.83 (m, 2H), 1.82-1.70 (m, 2H), 1.65-1.53 (m, 2H), 1.37 (s, 9H). ESI-MS: m/z [M+H]+ calculated for C35H50N9O6+ 692.39, found 692.21.
According to the synthesis method of Compound 15, Compound 13 (300 mg, 593.38 μmol, 1.0 equiv.) and tert-butyl [2-(2-aminoethoxy)ethoxy]ethylcarbamate (176.82 mg, 712.06 μmol, 1.2 equiv.) were used as raw materials to obtain 310 mg of Compound 17, yellow solid, with a yield of 71%. 1H NMR (400 MHz, DMSO-d6) δ 10.09 (s, 1H), 8.95 (s, 1H), 8.06 (d, J=2.6 Hz, 1H), 7.85 (d, J=9.0 Hz, 1H), 7.77 (s, 1H), 7.48 (dd, J=9.1, 2.7 Hz, 1H), 6.74 (t, J=5.4 Hz, 1H), 5.87-5.77 (m, 1H), 3.50 (s, 4H), 3.45 (t, J=5.8 Hz, 2H), 3.39-3.36 (m, 2H), 3.30-3.26 (m, 2H), 3.21 (s, 3H), 3.12-2.81 (m, 6H), 2.62 (s, 3H), 2.42 (s, 3H), 2.31 (s, 3H), 2.28-2.18 (m, 2H), 1.93-1.83 (m, 2H), 1.81-1.72 (m, 2H), 1.64-1.54 (m, 2H), 1.36 (s, 9H). ESI-MS: m/z [M+H]+ calculated for C37H54N9O7+ 736.41, found 736.10.
Compound 15 (245 mg, 378.21 μmol, 1.0 equiv.) was dissolved in a mixed solvent of dichloromethane (3 mL) and trifluoroacetic acid (3 mL) and stirred at room temperature for 30 minutes. Most of the solvent in the reaction solution was then rotary dried. A small amount of toluene was added and then rotary dried. This operation was repeated many times until the residual trifluoroacetic acid was removed. The obtained crude product of Compound 18 was directly used for the next reaction without further purification. The residue was dissolved in dichloromethane (15 mL). Then DIPEA (312.54 μL, 1.89 mmol, 5.0 equiv.) was added, and stirred at room temperature for 10 minutes until DIPEA was completely dissolved. Then propargic acid (38.80 μL, 567.31 μmol, 1.5 equiv.) and HATU (172.57 mg, 453.85 μmol, 1.2 equiv.) were added to the reaction solution and stirred at room temperature for 6 hours. The reaction solution was diluted with 100 mL of dichloromethane, and washed with water and brine. The organic phases were dried over anhydrous Na2SO4. The organic solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography (dichloromethane/methanol=60:1 to 30:1) to obtain 135 mg of Compound 21, yellow solid, with a yield of 60%. 1H NMR (400 MHz, DMSO-d6) δ 10.09 (s, 1H), 8.95 (s, 1H), 8.73 (s, 1H), 8.06 (d, J=2.9 Hz, 1H), 7.99-7.76 (m, 2H), 7.48 (dd, J=9.1, 2.9 Hz, 1H), 5.90-5.77 (m, 1H), 4.14 (s, 1H), 3.32-3.07 (m, 8H), 2.98 (s, 2H), 2.60 (s, 4H), 2.43 (s, 3H), 2.31 (s, 3H), 2.29-2.16 (m, 2H), 1.97-1.83 (m, 2H), 1.83-1.70 (m, 2H), 1.66-1.53 (m, 2H). ESI-MS: m/z [M+H]+ calculated for C31H38N9O4+ 600.30, found 600.26.
According to the synthesis method of Compound 21, Compound 16 (342 mg, 494.34 μmol, 1.0 equiv.) was used as a raw material to obtain 148 mg of Compound 22, yellow solid, with a yield of 47%. 1H NMR (400 MHz, DMSO-d6) δ 10.09 (s, 1H), 8.95 (s, 1H), 8.74 (t, 1H), 8.06 (d, J=2.8 Hz, 1H), 7.85 (d, J=9.0 Hz, 1H), 7.76 (t, J=5.8 Hz, 1H), 7.47 (dd, J=9.1, 2.9 Hz, 1H), 5.88-5.77 (m, 1H), 4.11 (s, 1H), 3.47-3.40 (m, 4H), 3.31-3.10 (m, 8H), 2.99 (s, 2H), 2.61 (s, 4H), 2.42 (s, 3H), 2.31 (s, 3H), 2.29-2.17 (m, 2H), 1.95-1.84 (m, 2H), 1.82-1.71 (m, 2H), 1.64-1.51 (m, 2H). ESI-MS: m/z [M+H]+ calculated for C33H42N9O5+ 644.33, found 644.29.
According to the synthesis method of Compound 21, Compound 17 (310 mg, 421.26 μmol, 1.0 equiv.) was used as a raw material to obtain 120 mg of Compound 23, yellow solid, with a yield of 41.5%. 1H NMR (400 MHz, DMSO-d6) δ 10.10 (s, 1H), 8.95 (s, 1H), 8.86-8.62 (m, 1H), 8.06 (d, J=2.7 Hz, 1H), 7.85 (d, J=9.0 Hz, 1H), 7.77 (t, J=5.6 Hz, 1H), 7.48 (dd, J=9.0, 2.7 Hz, 1H), 5.90-5.75 (m, 1H), 4.11 (s, 1H), 3.59-3.40 (m, 10H), 3.30-3.19 (m, 6H), 2.99 (s, 2H), 2.61 (s, 4H), 2.42 (s, 3H), 2.31 (s, 3H), 2.28-2.14 (m, 2H), 1.94-1.82 (m, 2H), 1.82-1.67 (m, 2H), 1.65-1.50 (m, 2H). ESI-MS: m/z [M+H]+ calculated for C35H46N9O6+ 688.36, found 688.20.
Compound 9 (100 mg, 259.83 μmol, 1.0 equiv.) and compound 13 (197.05 mg, 389.74 μmol, 1.5 equiv.) were dissolved in dry dichloromethane (15 mL). Then HATU (148.19 mg, 389.74 μmol, 1.5 equiv.) and DIPEA (226.29 μL, 1.30 mmol, 5.0 equiv.) were added to the reaction solution, and stirred overnight at room temperature. The reaction solution was diluted with 100 mL of dichloromethane, and washed with water and brine. The organic phases were dried over anhydrous Na2SO4. The organic solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography (dichloromethane/methanol=50:1 to 20:1) to obtain 80 mg of Compound 24, yellow solid, with a yield of 35%. 1H NMR (400 MHz, DMSO-d6) δ 10.07 (s, 1H), 8.95 (s, 1H), 8.01 (s, 1H), 7.97 (d, J=2.5 Hz, 1H), 7.93 (t, J=5.6 Hz, 1H), 7.82 (d, J=9.0 Hz, 1H), 7.33 (dd, J=9.1, 2.4 Hz, 1H), 7.25 (s, 1H), 6.68 (s, 2H), 5.82 (p, J=8.7 Hz, 1H), 5.24 (s, 2H), 3.70 (s, 3H), 3.41-3.34 (m, 2H), 3.13 (s, 4H), 3.00 (s, 2H), 2.68-2.54 (m, 6H), 2.43 (s, 3H), 2.31 (s, 3H), 2.29-2.18 (m, 5H), 2.13 (s, 3H), 1.93-1.82 (m, 2H), 1.81-1.71 (m, 2H), 1.64-1.51 (m, 2H). 13C NMR (100 MHz, DMSO) δ 202.92, 169.58, 163.78, 161.24, 160.00, 159.03, 158.72, 155.23, 153.87, 153.80, 152.07, 149.21, 144.76, 143.78, 142.55, 135.73, 131.49, 129.68, 125.50, 124.95, 123.85, 115.61, 107.96, 107.05, 95.52, 89.77, 74.82, 61.66, 60.26, 53.34, 53.06, 48.66, 46.86, 37.93, 31.78, 28.04, 25.58, 20.48, 14.10, 13.32, 10.69. ESI-HRMS: m/z [M+H]+ calculated for C45H51ClN13O4+ 872.3870, found 872.3872.
Compound 8 (123.36 mg, 300.26 μmol, 1.0 equiv.), compound 11 (150 mg, 300.26 μmol, 1.0 equiv.) and sodium ascorbate (237.93 mg, 1.20 mmol, 4.0 equiv.) were dissolved in t-BuOH/DCM (10 mL/5 mL). Then CuSO4 (71.88 mg, 450.39 μmol, 1.5 equiv.) was dissolved in 5 mL of water and added dropwise to the above reaction solution. The reaction solution was heated to 50° C. under the protection of N2 and stirred for 3 hours. After the reaction solution was cooled to room temperature, the solvent was rotary dried. The residue was dissolved in 2M aqueous ammonia (20 mL), and extracted with dichloromethane. The organic layers were combined, and washed with water and brine. The organic phases were dried over anhydrous Na2SO4. The organic solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography (dichloromethane/methanol=50:1 to 20:1) to obtain 110 mg of Compound 25, yellow solid, with a yield of 42%. 1H NMR (400 MHz, DMSO-d6) δ 10.15 (s, 1H), 8.96 (s, 1H), 8.67 (s, 1H), 8.10 (s, 1H), 8.05 (s, 1H), 7.90 (s, 1H), 7.52 (d, J=7.7 Hz, 1H), 7.26 (s, 1H), 6.70 (s, 2H), 5.90-5.76 (m, 1H), 5.27 (s, 2H), 4.65 (t, J=6.2 Hz, 2H), 4.25 (s, 2H), 3.81 (s, 2H), 3.71 (s, 3H), 3.23 (s, 4H), 3.12 (t, J=6.1 Hz, 2H), 2.43 (s, 3H), 2.34-2.22 (m, 8H), 2.14 (s, 3H), 1.95-1.87 (m, 2H), 1.82-1.74 (m, 2H), 1.63-1.56 (m, 2H). 13C NMR (100 MHz, DMSO) δ 202.94, 163.79, 161.21, 160.01, 159.88, 153.84, 153.79, 152.11, 149.26, 143.30, 131.93, 129.42, 125.51, 123.84, 107.81, 94.97, 87.75, 75.89, 60.28, 53.42, 48.96, 46.88, 31.78, 28.04, 25.61, 21.13, 14.10, 13.33, 10.71. ESI-HRMS: m/z [M+H]+ calculated for C46H49ClN15O4+ 910.3775, found 910.3773.
According to the synthesis method of Compound 25, Compound 8 (113.57 mg, 276.42 μmol, 1.0 equiv.) and Compound 14 (150 mg, 276.42 μmol, 1.0 equiv.) were used as raw materials to obtain 115 mg of Compound 25, yellow solid, with a yield of 43.6%. 1H NMR (400 MHz, DMSO-d6) δ 10.09 (s, 1H), 8.95 (s, 1H), 8.26 (t, J=5.8 Hz, 1H), 8.04 (s, 2H), 7.99 (s, 1H), 7.84 (d, J=9.0 Hz, 1H), 7.44 (d, J=8.9 Hz, 1H), 7.26 (s, 1H), 6.69 (s, 2H), 5.88-5.77 (m, 1H), 5.26 (s, 2H), 4.55 (t, J=6.6 Hz, 2H), 4.36 (d, J=5.7 Hz, 2H), 3.71 (s, 3H), 3.17 (s, 4H), 3.10-2.89 (m, 4H), 2.57 (s, 4H), 2.42 (s, 3H), 2.38-2.18 (m, 8H), 2.14 (s, 3H), 1.93-1.83 (m, 2H), 1.81-1.71 (m, 2H), 1.62-1.53 (m, 2H). 13C NMR (100 MHz, DMSO) δ 202.93, 169.61, 163.79, 161.23, 160.01, 159.03, 158.73, 155.23, 153.86, 153.79, 152.14, 149.24, 145.37, 144.75, 143.84, 142.56, 135.79, 131.90, 129.68, 125.51, 125.13, 123.82, 123.29, 115.64, 107.85, 107.03, 95.08, 88.04, 75.73, 61.50, 60.28, 53.36, 53.04, 48.64, 46.88, 34.57, 31.78, 28.03, 26.82, 25.59, 21.36, 14.10, 13.33, 10.70. ESI-HRMS: m/z [M+H]+ calculated for C48H54ClN16O4+ 953.4197, found 953.4205.
According to the synthesis method of Compound 25, Compound 8 (68.5 mg, 166.75 μmol, 1.0 equiv.) and Compound 21 (100 mg, 166.75 μmol, 1.0 equiv.) were used as raw materials to obtain 77 mg of Compound 27, yellow solid, with a yield of 45.7%. 1H NMR (400 MHz, DMSO-d6) δ 10.09 (s, 1H), 8.92 (s, 1H), 8.64 (s, 1H), 8.58 (t, J=5.3 Hz, 1H), 8.04 (s, 1H), 8.00 (s, 1H), 7.95-7.78 (m, 2H), 7.42 (dd, J=8.8, 1.7 Hz, 1H), 7.20 (s, 1H), 6.69 (s, 2H), 5.88-5.77 (m, 1H), 5.24 (s, 2H), 4.60 (t, J=6.5 Hz, 2H), 3.71 (s, 3H), 3.48-3.35 (m, 4H), 3.16-3.03 (m, 6H), 2.96 (s, 2H), 2.55 (s, 4H), 2.43 (s, 3H), 2.30-2.20 (m, 8H), 2.15 (s, 3H), 1.94-1.85 (m, 2H), 1.83-1.73 (m, 2H), 1.63-1.54 (m, 2H). 13C NMR (100 MHz, DMSO) δ 202.95, 169.84, 163.79, 161.22, 160.50, 159.98, 158.99, 158.65, 155.20, 153.84, 153.74, 152.11, 149.24, 144.81, 143.78, 143.18, 142.55, 135.78, 131.82, 129.67, 127.00, 125.51, 125.13, 123.84, 115.50, 107.79, 107.01, 94.96, 87.61, 75.80, 65.49, 60.28, 53.40, 52.98, 48.99, 48.61, 46.86, 38.75, 38.62, 31.78, 28.04, 25.61, 21.13, 14.06, 13.33, 10.70. ESI-HRMS: m/z [M+H]+ calculated for C50H57ClN17O5+ 1010.4412, found 1010.4421.
According to the synthesis method of Compound 25, Compound 8 (89.35 mg, 217.48 μmol, 1.0 equiv.) and Compound 22 (140 mg, 217.48 μmol, 1.0 equiv.) were used as raw materials to obtain 90 mg of Compound 28, yellow solid, with a yield of 39.2%. 1H NMR (400 MHz, DMSO-d6) δ 10.09 (s, 1H), 8.94 (s, 1H), 8.62 (s, 1H), 8.40 (t, J=5.0 Hz, 1H), 8.05 (s, 2H), 7.86 (d, J=8.3 Hz, 1H), 7.79 (s, 1H), 7.46 (d, J=7.7 Hz, 1H), 7.23 (s, 1H), 6.69 (s, 2H), 5.88-5.75 (m, 1H), 5.25 (s, 2H), 4.61 (t, J=6.0 Hz, 2H), 3.72 (s, 3H), 3.54-3.41 (m, 6H), 3.31-3.27 (m, 2H), 3.19 (s, 4H), 3.11-3.04 (m, 2H), 3.00 (s, 2H), 2.60 (s, 4H), 2.43 (s, 3H), 2.33-2.20 (m, 8H), 2.15 (s, 3H), 1.92-1.84 (m, 2H), 1.81-1.73 (m, 2H), 1.61-1.53 (m, 2H). 13C NMR (100 MHz, DMSO) δ 202.92, 167.43, 163.79, 161.23, 160.22, 159.99, 159.02, 158.69, 155.22, 153.84, 153.76, 152.13, 149.25, 144.76, 143.83, 143.14, 142.55, 135.82, 131.99, 129.13, 126.94, 125.50, 125.16, 123.84, 115.61, 107.82, 107.03, 94.98, 87.67, 75.80, 69.25, 69.06, 65.50, 60.28, 53.38, 52.99, 49.01, 48.63, 46.85, 38.74, 38.66, 31.77, 28.03, 25.58, 21.11, 14.07, 13.32, 10.70. ESI-HRMS: m/z [M+H]+ calculated for C52H61ClN17O6+ 1054.4674, found 1054.4683.
According to the synthesis method of Compound 25, Compound 8 (73.47 mg, 178.83 μmol, 1.0 equiv.) and Compound 23 (123 mg, 178.83 μmol, 1.0 equiv.) were used as raw materials to obtain 88 mg of Compound 29, yellow solid, with a yield of 44.8%. 1H NMR (400 MHz, DMSO-d6) δ 10.06 (s, 1H), 8.94 (s, 1H), 8.62 (s, 1H), 8.36 (t, J=4.9 Hz, 1H), 8.05 (s, 2H), 7.85 (d, J=8.8 Hz, 1H), 7.76 (s, 1H), 7.46 (d, J=8.1 Hz, 1H), 7.23 (s, 1H), 6.67 (s, 2H), 5.88-5.74 (m, 1H), 5.26 (s, 2H), 4.61 (t, J=6.0 Hz, 2H), 3.72 (s, 3H), 3.53 (s, 6H), 3.47-3.39 (m, 4H), 3.29-3.25 (m, 2H), 3.19 (s, 4H), 3.09 (t, J=6.0 Hz, 2H), 2.99 (s, 2H), 2.60 (s, 4H), 2.42 (s, 3H), 2.34-2.19 (m, 8H), 2.15 (s, 3H), 1.96-1.84 (m, 2H), 1.83-1.72 (m, 2H), 1.64-1.53 (m, 2H). 13C NMR (100 MHz, DMSO) δ 202.89, 169.55, 163.81, 161.24, 160.19, 160.00, 159.03, 158.69, 155.23, 153.84, 153.78, 152.14, 149.27, 144.78, 143.84, 143.15, 142.55, 135.84, 131.84, 129.69, 126.93, 125.50, 125.16, 123.86, 115.62, 107.84, 107.05, 95.00, 87.69, 75.81, 70.02, 69.97, 69.48, 69.28, 61.57, 60.28, 53.40, 53.00, 49.02, 48.70, 46.87, 38.69, 38.61, 31.76, 28.03, 25.57, 21.13, 14.07, 13.32, 10.71. ESI-HRMS: m/z [M+H]+ calculated for C54H65ClN17O7+ 1098.4936, found 1098.4947.
Biacore T200 control software was started to install CM5 chip according to the standard process, to prepare for the formal experiment. The buffer was used to flush the flow path system inside the whole system at a high flow rate. An appropriate program was selected according to the sample size. The trap chip was started, and the coupling buffer was PBS (pH 7.4). Sufficient sample, EDC/NHS, blocking buffer were prepared. The coupling program was started, and the final ligand coupling amount was about 12500 RU. After the coupling was completed, the assay was started. The buffer was changed to 1% DMSO PBS (pH 7.4). The analyte binding time was set to 120 s, with a flow rate of 30 μL/min. The dissociation time was set to 300 s, with a flow rate of 30 μL/min. The regeneration time was set to 30 s, with a flow rate of 30 μL/min. The corresponding samples to be tested were prepared according to the requirements, and the program was automatically run for testing. The results were analyzed. According to the operation results, data fitting analysis was carried out to obtain the final affinity fitting KD value.
The results in
After B16F10 cells were treated with the compound at different concentrations and for different periods of time, the levels of CDK4 and CDK6 proteins in the cells were measured by Western blot. Firstly, intracellular proteins were extracted and quantified. The cells were lysed with RIPA cell lysate (with a protease inhibitor), and proteins were collected, which were quantified by a BCA protein quantitative determination kit and quantified to the same concentration. Protein denaturation: The proteins were placed in a water bath at 100° C. for 8 minutes to denature the proteins. Loading and gel electrophoresis: The loading amount per cell was generally 20 μL. The electrophoretic voltage of the upper concentration gel was 75 V and the electrophoretic voltage of the lower separation gel was 120 V. When the protein marker of 40 KD reached about 1 cm at the end of the gel, the electrophoresis was ended. Membrane transfer: The membrane transfer was carried out using a wet transfer instrument, at a constant current of 250 mA for 90 minutes. The PVDF membrane should be soaked with methanol beforehand. Blocking: The PVDF membrane was placed in BSA blocking buffer for 1 h (with slow shaking in a shaker). Incubation with primary antibody: The primary antibody was diluted according to the instructions. The primary antibody was added, followed by incubation overnight at 4° C. Membrane washing: The membrane was washed with TBST washing buffer for 3 times, each time for 10 minutes. Incubation with secondary antibody: The second antibody was added, followed by incubation in a shaker at room temperature for 1 h. Membrane washing: The membrane was washed with TBST washing buffer for 3 times, each time for 10 minutes. Exposure: Equal volumes of ECL developing solutions A and B were mixed for exposure.
After B16F10 melanoma cells were treated with small molecule HEMTACs for 24 h, the Western blot results (
B16F10 cells (106 cells/mouse) were injected subcutaneously into the forelimb of C57BL/6 mice to establish an xenograft model of mouse B16F10 melanoma. When the tumor volume reached 100-200 mm3, the mice were randomly divided into four groups (n=6). The compound was injected intraperitoneally every day for two weeks, and the body weights and tumor volumes of the mice were measured every two days. The tumor length and width were measured along two orthogonal axes with a vernier caliper, and the tumor volume in the mouse was calculated based on an equation V (mm3)=(length×width2)/2.
According to
The above embodiments are merely illustrative of the technical concept and features of the present invention, and provided for facilitating the understanding and practice of the present invention by those skilled in the art. However, the protection scope of the invention is not limited thereto. Equivalent variations or modifications made without departing from the spirit and essence of the present invention are intended to be contemplated within the protection scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202210241970.5 | Mar 2022 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2022/093374 | 5/17/2022 | WO |
