Patent Application
20210145914
This invention relates to a plant extract and to its therapeutic use.
WO 03/101479 A1 describes the valuable therapeutic properties of a composition comprising various components, typically administered together by intramuscular injection. The composition that was used in the examples comprises a camomile extract, although no direct therapeutic activity is ascribed to it; rather, it is described as an anti-irritant whose presence may alleviate the unpleasant effects of the injection per se.
WO 2007/057651 A1 discloses a process for the removal of water-soluble contaminants having lipid groups, especially endotoxins from aqueous compositions of camomile.
In WO 01/13929 A1 is described a substantially pure biologically active extract isolated from Achillea millefolium. This extract, preferably a methanolic extract, has antineoplastic activity, and is used as anti-cancer agent.
In WO 2008/146009 A1 are described the effects of camomile essential oil or the seed oil of black cumin or a mixture of both oils on 5-lipoxygenase activity in the human granulocyte cell line HL 60 and on the DNA-synthesis in the human glioblastoma cell line U87MG. In this reference are also described the effects of said oils on the IL-6 release in the human macrophage cell line THP1 and on the DNA-synthesis in the human prostate cancer cell DU 145.
In U.S. Pat. No. 6,300,370 B1 is described a process for manufacturing essential camomile oil. In this process a camomile extraction residue is subjected to a steam distillation or to an aqueous distillation. Said camomile extraction residue is obtained by the treatment of camomile flowers and stalks with an aqueous or organic solvent or a mixture thereof, with or without a preceding steam distillation of the starting material.
P.Vilaginès, P. Delaveau and R. Vilaginès “Inhibition de la replication du poliovirus par un extrait de Matricaria chamomilla (L.)”, Comptes Rendus de l'Acadèmie des Sciences, Sèrie III, Tome 301, No. 6, 1985, pages 289 to 294 describe the effect of a hydroalcoholic extract of Matricaria chamomilla L. on the growth of poliovirus type 1. When this camomile extract is added during the early stage of poliovirus development, then said extract inhibits cellular and viral RNA synthesis. This inhibition is partially reversible.
It is an object of the present invention to provide a composition for the treatment of an abnormal proliferative and/or viral condition.
It is a further object of the present invention to provide a composition for the synchronization and the S-phase arrest of abnormal proliferative mammalian cells, especially of cancer cells, in the human or animal body.
This synchronization shall comprise the induction of ornithine decarboxylase and/or the inhibition of topoisomerase II.
It is also an object of the present invention to provide a composition for the treatment of an abnormal proliferative condition wherein the treatment comprises the simultaneous or sequential administration of this composition and of at least one anti-tumor agent.
These objects are attained with the present invention.
The invention is characterized by the characteristics as defined in the independent claims.
Preferred embodiments are defined in the dependent claims.
This composition may also consist of an aqueous and/or organic extract of at least one Chamomilla plant and/or of at least one Achillea plant and of at least one anti-tumor agent, and occasionally of at least one pharmaceutical and/or dermatological acceptable auxiliary agent.
Surprisingly, it has now been found that a camomile extract, obtained from the flower heads, such as that described in WO 2007/057651 A1, has valuable therapeutic properties. In particular, it has been found that it can reduce the DNA- and RNA-synthesis without substantial effect on protein synthesis, from which utility in the treatment of cancer may be deduced.
Even more surprisingly it has been found that organic extracts of the tubular flowers of Matricaria recutita L. (Flores tubiformis) are suitable for the synchronization and the S-phase arrest of abnormal proliferative mammalian cells, especially of cancer cells.
This synchronization takes place due to the induction of ornithine decarboxylase (transfer from G0-phase into G1-phase) and the inhibition of topoisomerase II (accumulation and arrest in the early S-phase).
It was also found that the inhibition of topoisomerase II was more than 100-fold stronger with an organic extract than with an aqueous extract (with respect to the concentration for complete inhibition of the enzyme).
Due to the fact that the inhibition of the topoisomerase II is crucial for the effectiveness of cell synchronization the organic extracts of the tubular flowers of Matricaria recutita L., (Flores tubiformis) of the present invention are much more potent than the corresponding aqueous extracts.
The invention is based on data obtained using an aqueous extract of camomile and on data obtained using organic extracts, especially alcoholic extracts, for example ethanolic extracts, of the tubular flowers of Matricaria recutita L., (Flores tubiformis).
The available evidences show that the aqueous camomile extract obtained as described below maintains proteinbiosynthesis, whereas DNA- and RNA-biosynthesis is reduced. This is a good measure of the desirable properties of this extract.
The aqueous and/or organic extracts may be obtained by any suitable procedure known to those of ordinary skill in the art. The extracts may be obtained by using an aqueous and/or organic medium, especially an alcoholic medium, such as an ethanolic medium, and separated from other components.
A preferred procedure for the preparation of an aqueous extract is described in WO 2007/057651 A1.
Preferably, the composition according to the present invention additionally comprises at least one component selected from the group consisting of pharmaceutical aids, preferably selected from the group consisting of pharmaceutical agents and pharmaceutical excipients.
The aqueous extract may be subjected to a purification process. Such an extract comprises a multi-component mixture of water-soluble components. It may be obtained by adding water to the appropriate plant part, to obtain a suspension that is then usually heated to a temperature below the boiling point of water, e.g. 90-94° C., and then cooled to room temperature.
The aqueous extract is then subjected to two filtration steps. For the purposes of illustration only, these will be described below as microfiltration and ultrafiltration, respectively. Other techniques, such as use of a lipophilic barrier, may be suitable. Each filtration step may be conducted in one, two or more than two stages, if desired.
Microfiltration is applied in order to remove material that would otherwise compromise the effectiveness of the ultrafiltration step.
In the following part are described possible embodiments of the present invention.
The following examples illustrate the present invention.
The analysis of bacterial endotoxins of the samples obtained in the Examples was performed with the Cambrex PyroGene assay using a dilution factor of 1:10.000.
45 g of yellow tubular camomile flowers (Chamomilla recutita) were mixed with 900 g of water (Aqua purificata, Ph. Helv.). This mixture was heated to a temperature between 90° C. and 94° C. within 20 to 30 minutes. Thereafter the mixture was stored at room temperature (15° C. to 25° C.) until a temperature between 30° C. and 35° C. was reached.
The drug residue was removed by deep layer filtration. The obtained crude filtrate was clarified by filtration through a 0.22 μm membrane.
To the clarified filtrate, 0.3% (Example 1) or 0.1% (Example 2), with respect to the extract mass, of ricinus oil (Ph.Eur.) was added. The obtained mixture was homogenized for 5 minutes. This so prepared extract was filtered (in tangential flow mode) with retentate recovery via a 0.22 μm membrane.
The obtained permeate was filtered (in tangential flow mode) with retentate recovery via a 0.1 μm membrane. Finally, the obtained permeate was filtered (in tangential flow mode) with retentate recovery via a 1000 kDa membrane.
Residue of bacterial endotoxins in each final filtrate: <100 EU/ml.
Example 1 was repeated, except that, instead of ricinus oil, 0.3% (Example 3), 1.0% (Example 4; VIP-E_Matr'06_1003) and 3.0% (Example 5), with respect to the extract mass, of mygliol (Ph. Eur.) was added to the clarified filtrate.
Residue of bacterial endotoxins in each final filtrate: <100 EU/ml.
This Example uses a revised protocol, in which heating and cooling were performed, not in an autoclave but in a 10 L double layer vessel under stirring (max. temperature of heating device 140° C.).
Mygliol was added instead of ricinus oil. The mygliol was “Mygliol 812 for parenteral use” from Hanseler. The mixture was stirred at room temperature for 10 minutes, instead of homogenization.
Microfiltrations according to the above described process were all performed with Millipore Pellicon 2 systems. For better practicability and to avoid time-consuming cleaning procedures, the microfiltrations in this Example were performed with the following equipment:
In addition, phenol was added, for stabilization of the extract. The amount of added phenol was 6.0-8.0 mg/ml. It was added after the 1000 kDa filtration. After the addition, the suspension was stirred for approximately 10 minutes, until all phenol was dissolved.
The endotoxin level was low in each case.
100 g of tubular flowers from the inflorescence of Matricaria recutita L. were extracted under stirring at a temperature between 40° C. and 60° C. during 2 hours with 500 g 80% (m/m) ethanol, corresponding to a drug to solvent ratio of 1/5. Subsequently the preparation was subjected to a deep layer filtration using a cellulose filter (AF 6 Filtrox®). 385 g of a clear dark brown liquid extract with a solid content of 4.43% (m/m) were obtained.
100 g of tubular flowers from the inflorescence of Matricaria recutita L. were extracted under stirring at a temperature between 40° C. and 60° C. during 2 hours with 500 g 90% (m/m) ethanol, corresponding to a drug to solvent ratio of 1/5. Subsequently the preparation was subjected to a deep layer filtration using a cellulose filter (AF 6 Filtrox®). 398 g of a clear dark brown liquid extract with a solid content of 1.89% (m/m) were obtained.
100 g of tubular flowers from the inflorescence of Matricaria recutita L. were extracted under stirring at a temperature between 40° C. and 60° C. during 2 hours with 500 g 99.9% (m/m) ethanol, corresponding to a drug to solvent ratio of 1/5. Subsequently the preparation was subjected to a deep layer filtration using a cellulose filter (AF 6 Filtrox®). 412 g of a clear dark brown liquid extract with a solid content of 1.54% (m/m) were obtained.
The following examples illustrate the pharmacological activity profile of the extracts of examples 4, 7, 8 and 9.
With the liquid extract VIP-E_Matr'06_1003 prepared according to example 4 were carried out ornithine decarboxylase expression experiments.
For the measurement of the induction of ornithine decarboxylase expression this extract was added to HepG2 cells in concentrations of 150, 100, or 30 μg/ml. The so treated cells were cultivated during 6 hours, 24 hours, or 48 hours in 10% FBS culture medium.
Then was determined the change of the amount of the ornithine decarboxylase by means of the Westernblot analysis. It is obvious from the data shown in
With the liquid extract ViP-E_Matr'08_1102 prepared according to example 7 were carried out topoisomerase I activity experiments with extract concentrations of 0.3, 1, 3, 10, or 30 μg/ml. As positive control camptothecin was carried along.
For the measurement of the inhibition of topoisomerase 1 activity this extract was added to purified human DNA topoisomerase I and the “Topoisomerase I Drug Screening Kit” from TopoGEN. Thereby it was proceeded according to the manufacturer's protocol. The DNA was separated by electrophoresis on an agarose gel and visualized under UV light after staining with ethidium bromide. With this approach the relaxed DNA (topoisomers) generated by topoisomerase I could be detected and clearly separated from the supercoiled DNA substrate.
It is obvious from the data shown in
With the liquid extract ViP-E_Matr'08_1102, prepared according to example 7, the liquid extract ViP-E_Matr'08_1106, prepared according to example 8, or the liquid extract ViP-E_Matr'08_1105, prepared according to example 9, were carried out topoisomerase II activity experiments with extract concentrations of 0.3, 1, or 3 μg/ml. As positive control etoposide was carried along.
The inhibition of topoisomerase II was determined using purified human DNA topoisomerase IIα and the “Topoisomerase II Drug Screening Kit” from TopoGEN. Thereby it was proceeded according to the manufacturer's protocol. The DNA was separated by electrophoresis on an agarose gel and visualized under UV light after staining with ethidium bromide. With this approach the relaxed DNA (topoisomers) generated by topoisomerase II could be detected and clearly separated from the supercoiled DNA substrate.
It is obvious from the data shown in
This inhibition was more than 100-fold stronger than the inhibition obtained with the aqueous extract of example 4. Nearly 150 μg/ml were necessary for complete inhibition (data not shown).
With the liquid extract VIP-E_Matr'06_1003 prepared according to example 4 were carried out cell cycle analysis experiments. As positive control for cell cycle arrest in S-phase camptothecin was carried along.
For the measurement of the induction of cell cycle arrest this extract was added to HepG2 cells in concentrations of 10, 50, 100, or 150 μg/ml. The so treated cells were cultivated during 48 hours in 10% FBS culture medium.
Then was determined the change of the amount of cells in G1-, S- or G2-phase of the cell cycle by means of the cell cytometry analysis.
It is obvious from the data shown in
From a liquid extract obtained in analogy to example 9 the solvent was evaporated under reduced pressure (300 to 10 mbar) and at slightly elevated temperature (35° C. to 45° C.). 6.4 g of a dark brown resinous extract with a dry material content of >99% (m/m) were obtained.
The obtained resinous extract was found to be free or nearly free of essential oils (<0.01% m/m). The content of ethanol was found to be <0.05% (m/m), and the content of water was found to be <0.01% (m/m).
To 6.4 g of a liquid extract obtained in analogy to example 9 were added 6.4 g of oleic acid (Ph.Eur.) and 19.2 g of Macrogol 400 (Ph.Eur.).
The ethanol was evaporated under reduced pressure (300 to 10 mbar) and at slightly elevated temperature (35° C. to 45° C.). 31.8 g of a dark brown free-flowing liquid extract with a content of non-volatile components of >99% (m/m) were obtained.
The obtained water-free liquid extract was found to be free or nearly free of essential oils (<0.01% m/m). The content of ethanol was found to be <0.05% (m/m), and the content of water was found to be <0.01% (m/m).
To 10 g of the resinous extract obtained in analogy to example 14 were added 10 g of oleic acid (Ph.Eur.) and 20 g of Macrogol 400 (Ph.Eur.).
This mixture was homogenized. The so obtained water-free liquid extract had a content of non-volatile components of >99% (m/m).
20 g of yellow tubular camomile flowers (Anthemis nobilis L.) were mixed with 380 g of water (Aqua purificata, Ph. Helv.). This mixture was heated to a temperature between 90° C. and 94° C. within 20 to 30 minutes. Thereafter the mixture was stored at room temperature (22° C.) until a temperature between 30° C. and 35° C. was reached.
The drug residue was removed by deep layer filtration. The obtained crude filtrate was clarified by filtration through a 0.22 μm membrane.
To the clarified filtrate, 0.3% mygliol (Ph. Eur.), with respect to the extract mass, was added. The obtained mixture was homogenized for 5 minutes. This so prepared extract was filtered (in tangential flow mode) with retentate recovery via a 0.22 μm membrane.
The obtained permeate was filtered (in tangential flow mode) with retentate recovery via a 0.1 μm membrane. Finally, the obtained permeate was filtered (in tangential flow mode) with retentate recovery via a 1000 kDa membrane.
There were obtained 309 g of a clear, aqueous extract with a dry material content of 1.1% m/m.
Same procedure as in Example 17 but 20 g of the whole flower heads of Anthemis nobilis L were used.
There were obtained 295 g of a clear, aqueous extract with a dry material content of 1.6% m/m.
40 g of yellow tubular flowers (Achillea millefolium L.) were mixed with 760 g of water (Aqua purificata, Ph. Helv.). This mixture was heated to a temperature between 90° C. and 94° C. within 20 to 30 minutes. Thereafter the mixture was stored at room temperature (22° C.) until a temperature between 30° C. and 35° C. was reached.
The drug residue was removed by deep layer filtration. The obtained crude filtrate was clarified by filtration through a 0.22 μm membrane.
To the clarified filtrate, 0.3% mygliol (Ph. Eur.), with respect to the extract mass, was added. The obtained mixture was homogenized for 5 minutes. This so prepared extract was filtered (in tangential flow mode) with retentate recovery via a 0.22 μm membrane.
The obtained permeate was filtered (in tangential flow mode) with retentate recovery via a 0.1 μm membrane. Finally, the obtained permeate was filtered (in tangential flow mode) with retentate recovery via a 1000 kDa membrane.
There were obtained 667 g of a clear, aqueous extract with a dry material content of 1.3% m/m.
Same procedure as in Example 19 but 40 g of the whole flower heads of Achillea millefolium L.) were used.
There were obtained 634 g of a clear, aqueous extract with a dry material content of 1.4% m/m.
20 g of tubular flowers from the inflorescence of Anthemis nobilis L. were extracted under stirring at a temperature between 40° C. and 60° C. during 2 hours with 100 g 99.9% (m/m) ethanol, corresponding to a drug to solvent ratio of 1/5. Subsequently the preparation was subjected to a deep layer filtration using a cellulose filter (AF 6 Filtrox®). 71 g of a clear dark brown liquid extract with a solid content of 1.62% (m/m) were obtained.
40 g of tubular flowers from the inflorescence of Achillea millefolium L. were extracted under stirring at a temperature between 40° C. and 60° C. during 2 hours with 200 g 99.9% (m/m) ethanol, corresponding to a drug to solvent ratio of 1/5. Subsequently the preparation was subjected to a deep layer filtration using a cellulose filter (AF 6 Faroe). 153 g of a clear dark brown liquid extract with a solid content of 1.62% (m/m) were obtained.
The liquid extract according to Example 21 was examined on its ability to inhibit DNA synthesis in human hepatocellular carcinoma cells (HepG2) in vitro. To determine cellular proliferation, freshly synthesized DNA was quantified using the 5-Bromo-2′-deoxy-uridine (BrdU) Labeling and Detection Kit III (Roche Applied Science; Mannheim, Germany). BrdU is a thymidine analog which would be incorporated into new cellular DNA. [See: Gratzner, H. G. (1982) Science 218, 474-475].
In short, human hepatocellular carcinoma cells (HepG2) were harvested by trypsinisation and seeded at 10′000 cells/well in 96 well micro-plates. After 24 hours of pre-incubation at 37° C. and 5% CO2, the cells were treated with the liquid extract according to Example 21 at the following concentrations for 30 hours: 0, 1, 3, 10 and 100 μg/ml.
10 μl of BrdU (100 μM) were then added to the cells and further incubated for 18 hours. After incubation, the cells were washed 3 times with culture media to remove the excess BrdU before being fixed with ethanol. Prior to incubation with the anti-BrdU antibody, labeled with peroxidase (POD), DNA was partially digested with nucleases to allow the antibody to access the incorporated BrdU. After washing the excess antibody, the POD substrate ABTS was added. POD catalyzes the cleavage of ABTS, producing a coloured reaction product. The absorbance of the reaction product was measured at 405 nm (reference wavelength at 490 nm) with a Safire multifunctional microplate reader (Tecan, Mannedorf, Switzerland). The measured absorbance per well correlates directly to the level of BrdU incorporated into cellular DNA.
Sample points were measured as triplicates; errors were expressed as standard deviation (data no shown).
The data of the samples were expressed as a percentage of the solvent control values, and the IC50 values were calculated using GraphPad Software Inc (Prism, version 5, San Diego, Calif. USA).
Results
The results showed that the liquid extract according to Example 21 had an IC50 value of approximately 7 μg/ml (6.228 to 7.881 μg/ml). Thus, said liquid extract inhibited the growth of human hepatocellular carcinoma cells (HepG2) in a dose dependent manner.
Compositions according to the invention can be formulated by methods known to those skilled in the art. Pharmaceutically acceptable components should be used.
Administration is preferably by intravenous or, more preferably, intramuscular injection.
The pharmaceutical composition containing the active ingredient may be also in a form suitable for oral use.
Therapeutic use involves the treatment (and possibly also the prevention) of cancer, for example lung cancer, liver cancer and cancer of the pancreas. Other uses include topical conditions such as psoriasis, scleroderma and pemphigus, infectious bronchitis, cancers including sarcomas (such as Kaposi's sarcoma), leukemia, skin cancer and the carcinomas whose treatment is specifically illustrated below, as well as AIDS. More generally, the composition may be used for therapy of proliferative and viral conditions, especially those associated with DNA- or RNA-viruses. The action on RNA-viruses may be direct, while the action on DNA-viruses and cancer at least may be progressive. The medicament may also be useful in therapy of other genetic disorders such as motor neurone diseases and multiple sclerosis.
The medicament can also be used to treat other viral conditions. For example, the virus may be a coronavirus, as in the case of SARS (severe acute respiratory syndrome). Further, the medicament may have utility in veterinary medicine, e.g. in fowl's diseases such as Newcastle disease and fowl pox.
The following study illustrates further aspects of the invention obtained with the extract according to example 4.
In the following part is given a short description of the Figures:
The influence of the extract according to example 4 on RNA-, DNA- and proteinbiosynthesis using three different cell lines (HepG2: liver carcinoma cells; C33-A: cervix carcinoma cells and HT1376: bladder carcinoma cells) was examined in vitro.
Additionally the influence of the extract according to example 4 on the induction of apoptosis was tested on HepG2 cells. At the same time the cytotoxicity (membrane integrity) of the extract according to example 4 was examined on HepG2 cells.
Matricaria
recutita
VIP-E_Matr'06_1003 was prepared according to example 4.
For the RNA- and DNA-synthesis, assay cells (HepG2: hepatocellular carcinoma, human; C33-A: cervical carcinoma, human and HT1376: bladder carcinoma, human) were harvested by trypsinisation and seeded at 10'000 cells/well in a 96 well plate. After treatment of the cells with the samples at the required concentrations the plate was incubated for 2 hours at 37° C. and 5% CO2. The cells were pulsed with 5-3H-Uridine (1 μCi/ml) (Perkin Elmer) for the RNA-synthesis and with 6-3H-Thymidine (1 μCi/ml) (Perkin Elmer) for the DNA-synthesis during a further incubation period of 24 hours. The cells were washed with PBS and fixed twice with methanol for 5 min. The protein was precipitated by 0.3N TCA. After a washing step 150 μl 0.3N NaOH was added for 15 min to lyse the cells. Negative controls t(0) were carried out with the samples without cells.
To detect the incorporated 5-3H-Uridine for the RNA-synthesis and the 6-3H-Thymidine for the DNA-synthesis the samples were transferred in scintillation tubes with scintillation cocktail. The quantification was performed in a Tri-Garb 1900 TR liquid scintillation counter (Packard, USA).
The effect of several concentrations of samples was measured by determining amount of radiolabel (dpm) under the assay conditions. Dose related values were expressed as a percentage of the positive control values. Sample points were measured as duplicates, errors are expressed as difference from the mean.
The specific cellular 5-3H-Uridine incorporation ratio (%) was calculated in consideration of the results from the DNA-synthesis assay. The respective synthesis values (%) were divided by the DNA-synthesis coefficient.
For the proteinbiosynthesis assay cells (HepG2: hepatocellular carcinoma, human; C33-A: cervical carcinoma, human and HT1376: bladder carcinoma, human) were harvested by trypsinisation and seeded at 10'000cells/well in a 96 well plate. After treatment of the cells with the samples at the required concentrations the plate was incubated for 2 hours at 37° C. and 5% CO2. The cells were pulsed with L-[3,4,5-3H(N)]-Leucine, (1 μCi/ml) (Perkin Elmer) during a further incubation period of 24 hours. The cells were washed twice with PBS, lysed with RIPA-buffer and incubated on ice for 15 min. The lysate was transferred in a tube. 250 μl ice cold TCA (20%) was added and the samples were incubated on ice for further 15 min. After centrifugation for 20 min at 10'000×g and 4° C. the supernatant was removed and the pellet was resuspended in 250p1 TCA (5%) and centrifuged again. The received lysates of each sample were resuspended in 250 μl NaOH (0.2N) and heated for 2 min at 50° C. Negative controls t(0) were carried out with the samples without cells.
To detect the incorporated L-[3,4,5-3H(N)]-Leucine the samples were transferred in scintillation tubes with scintillation cocktail. The quantification was performed in a Tri-Carb 1900 TR liquid scintillation counter (Packard, USA).
The effect of several concentrations of the sample was measured by determining the amount of radiolabel (dpm) under the assay conditions. Dose related values were expressed as a percentage of the positive control values. Sample points were measured as quadruplicates, errors are expressed as standard deviations.
The specific cellular L-[3,4,5-3H(N)]-Leucine incorporation ratio (%) was calculated in consideration of the results from the DNA-synthesis assay. The respective synthesis values (%) were divided by the proliferation coefficient.
HepG2 cells (hepatocellular carcinoma, human) were harvested by trypsinisation and seeded at 10'000 cells/well in 100 μl in a 96 well plate. After 24 h, 20 μl samples and 80 μl of fresh medium (total volume 200 μl) were added. The plate was further incubated for 24 hours and in an additional experiment for 48 hours. After the centrifugation of the plate for 10 min at 200×g, the supernatant was discarded and the pellet was lysed for 30 min at room temperature in 200 μl Lysis buffer. The lysate was finally centrifuged for 10 min at 200×g. The solvent controls (=negative controls) were performed with solvent instead of sample. Seeding and incubation were performed in an incubator at 37° C. and 5% CO2.
The cytoplasmatic histone associated DNA-fragments (mono- and oligonucleosomes) in lysate supernatant were determined in vitro with a Cell Death Detection ELISAplus Kit (Roche, Cat-No: 11 774 425 001) according to the supplier recommendation.
The absorbance was measured with a microplate reader device (TECAN Infinite M200) at a wavelength of λ=405 nm and a reference wavelength of λ=490 nm. The specific enrichment factor of mono- and oligonucleosomes released into the cytoplasm was calculated as following:
Enrichment factor=absorbance sample/absorbance of the is corresponding negative control
Sample points were measured as duplicates, errors are expressed as difference from the mean.
LDH-Cytotoxicity assay (membrane integrity/induction of necrosis): the cytotoxicity was tested on HepG2 cells (hepatocellular carcinoma, human). The cells were seeded in a 96 well plate at 10'000 cells per well over night. 20 μl of the respective samples and solvent controls at the indicated concentrations and 80 μl of fresh medium (total volume 200 μl) were added. Seeding and incubation were performed in an incubator at 37° C. and 5% CO2. After an incubation period of 24 hours, the membrane integrity was measured with a LDH-cytotoxicity Assay Kit (BioVision, #K311-400, CA USA).
The membrane integrity of the cells was determined by measuring the activity of cytosolic lactate dehydrogenase (LDH) released into the medium under the influence of samples. The activity of the enzyme was measured by determining the formazan produced from the tetrazolium salt INT as substrate. The quantity of formazan was measured directly by determining the optical density (OD) with a plate reader (TECAN Infinite M200) at a wavelength of λ=490 nm.
For each test concentration, the OD values of the background (assay mixture with samples but without cells) was subtracted from OD measurements with cells. OD490-values were transformed into percentage values with cytotoxicity readings of 100% corresponding to measurements of the cells lysed (triton X-100) with solvent, and cytotoxicity readings of 0% corresponding to cells incubated with solvent only. The optical measurements were performed as duplicates. Errors were expressed as difference from the mean.
With respect to the DNA-, RNA- and proteinbiosynthesis the extract according to example 4 showed the following effects: the DNA-synthesis is dose dependent suppressed, while up to considerably high doses the RNA-synthesis is still intact and the proteinbiosynthesis is only marginal affected or, if adapted to the amount of proliferating cells, even increased (
In the subsequently initiated experiments with HepG2 cells for discrimination between apoptosis and necrosis (indicated by LDH-leakage and loss of cell membrane integrity), after 24 hours we detected no induction of apoptosis even in the highest tested dosage. The extract according to example 4 did not show any effects, neither apoptosis nor cytotoxicity.
Therefore it was decided to conduct an additional experiment with an incubation of the cells for 48 hours. Interestingly, after 48 hours it was found also no induction of apoptosis.
It is obvious from
α-Bisabolol, one of the main components of the essential oil of a Chamomilla plant, did not influence the topoisomerase II activity in all tested concentrations.
The essential oil of Matricaria recutita L. hardly inhibited the topoisomerase II activity. Only an incomplete inhibition at a relatively high concentration of 30 μg/ml was observed.
For the purpose of the present invention the terms “containing” or “comprising” shall mean that also additional compounds or components may be present, whereas the term “consist” shall mean that no additional compounds or components than those explicitly mentioned are present.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0808974.0 | May 2008 | GB | national |
| 01998/08 | Dec 2008 | CH | national |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12992957 | May 2011 | US |
| Child | 15652985 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15652985 | Jul 2017 | US |
| Child | 17159716 | US |
