Patent Application
20250189515
The present invention relates to methods for identifying compounds that can have an effect on lipid metabolism, and thereby have a high relevance for several human diseases including but not restricted to obesity, type 2 diabetes (T2D), non-alcoholic fatty liver disease (NAFLD), non-alcoholic steatohepatitis (NASH), fatty pancreas disease, and fatty kidney disease. More specifically, the present invention relates to methods for identifying modulators of the expression or the activity of the human kinase Mammalian Sterile20-like 3 (MST3).
The human kinome features a large branch of the so-called “STE” kinases, named after the yeast Sterile20 kinase. The STE superfamily includes several subfamilies, one of which is named the “Mammalian Sterile20-like” (MST) family (Creasy et al. 1996). There are five MST kinases in mammals, MST1 (also called STK4), MST2 (also called STK3), MST3 (also called STK24), MST4, and YSK1 (also called STK25 or SOK1). The five mammalian MST kinases can be broadly divided into three subgroups: MST1/2, MST3/4, and YSK1 depending on their respective regulation, substrates, and function (Thompson and Sahai, 2015).
MST1 and MST2 have been identified to be involved growth control, proliferation, and regulation of migration. MST3 and MST4 have been identified to influence cell migration, cell polarity, and apoptosis.
YSK1 has recently been shown to be a regulator of lipid and glucose metabolism (Nerstedt et al. 2012).
MST3 has been shown to regulate actin dynamics in many contexts. In the developing nervous system, MST3 is required for dendritic spine maintenance and limits filopodia formation (Ultanir et al. 2014). MST3 also limits actin-dependent protrusions in other cell types. This has been suggested to result in increased migration on 2D surfaces when it is depleted, but lead to defects in squeezing through gaps in 3D matrices (Lu et al. 2006; Madsen et al. 2015).
Mammalian cell culture studies also implicate MST3 in regulation of cell polarity. MST3 can localize to the Golgi apparatus possibly through interaction with Striatin proteins (Lu et al. 2006). Interaction with CCM3 or Mo25 can trigger the translocation of MST3 away from the Golgi apparatus to the plasma membrane.
MST3 can be cleaved by caspases (Lee et al. 1998; Lee et al. 2001). The cleavage occurs at amino acid 313 and separates the N-terminal kinase domain from the C-terminal regulatory sequences. This results in nuclear accumulation of the active kinase domain, which can promote apoptosis (Huang et al. 2002; Lee et al. 2004).
Consistent with its role in cell migration, MST3 has been implicated in cancer. It has been suggested that CCM3 promotes the activity of MST3 at the cell cortex, where it coordinates the phosphorylation of ERM proteins and MLC, enabling cancer cells to squeeze through small gaps (Madsen et al. 2015; Tozluoglu et al. 2015).
Proteomic work in mammalian cells has identified MST3 as a component of a large PP2A complex, termed the STRIPAK complex (Glatter et al. 2009; Kean et al. 2011). Recently, cancer genome sequencing has implicated the STRIPAK complex in cancer. FAM40B is mutated with a high frequency, and the number and type of mutations suggest that it has an oncogenic function (Davoli et al. 2013). Analysis of truncation mutants of FAM40B found in tumors reveals that they are not able to bind to the catalytic subunits of PP2A and may be defective in negatively regulating MST3 (Madsen et al. 2015).
Defective regulation of MST3 is also implicated in the pathology of endothelial malformations (Stockton et al. 2010; Zheng et al. 2010).
The prior art fails to identify a role for MST3 in lipid metabolism.
A method for treating or preventing a metabolic disease in a subject is disclosed. The method comprises administering a pharmaceutically effective amount of an oligonucleotide or polynucleotide 8-80 bases in length. The oligonucleotide or polynucleotide is hybridizable to the nucleic acid sequence of SEQ ID NO:1, or a nucleic acid sequence complementary to SEQ ID NO:1, thereby suppressing intracellular accumulation of cholesteryl ester and treating the subject having a metabolic disease. The metabolic disease is selected from the group consisting of non-alcoholic fatty liver disease (NAFLD), non-alcoholic steatohepatitis (NASH), fatty pancreas disease, and fatty kidney disease.
In some embodiments, the metabolic disease is non-alcoholic fatty liver disease (NAFLD).
In some embodiments, the metabolic disease is non-alcoholic steatohepatitis (NASH).
In some embodiments, the oligonucleotide or polynucleotide is selected from the group consisting of siRNA, shRNA, and antisense RNA or DNA.
In some embodiments, the oligonucleotide or polynucleotide is antisense RNA or DNA.
In some embodiments, the antisense oligonucleotide or polynucleotide is 8-30 bases in length.
In some embodiments, the subject is human.
In some embodiments, a nucleotide in the oligonucleotide or polynucleotide comprises an RNA residue, a DNA residue, or a nucleotide analogue.
In some embodiments, the oligonucleotide or polynucleotide is selected from the group consisting of a peptide nucleic acid (PNA), a phosphorodiamidate morpholino oligomer (PMO), and a phosphorothioate oligonucleotide (PS-ODN).
FIG. 1 shows (A) Representative Western blot with anti-MST3 antibodies, in which actin was used as a loading control; and (B) Oil Red O staining for neutral lipids, in which representative cell images are shown (scale bars, 100 μm).
NTC siRNA Basal,
MST3 siRNA Basal, □ NTC siRNA+OA, ▪ MST3 siRNA+OA; and (B) Oxidation of radio-labelled palmitate.
siRNA; and (B) Uptake of OA, -Δ- NTC siRNA Basal, -▴- MST3 siRNA Basal, -□- NTC siRNA+OA, -▪- MST3 siRNA+OA.
For
For
The present inventor has identified a role for MST3 in mammalian lipid metabolism. More specifically, the present inventor has recognized that MST3 has a role in regulation of lipid partitioning in mammalian cell system, and that MST3 controls the dynamic metabolic balance of lipid utilization versus lipid storage in peripheral tissues prone to lipotoxicity and is thereby expected to regulate insulin sensitivity, which has a high relevance for several human diseases including but not restricted to obesity, type 2 diabetes (T2D), non-alcoholic fatty liver disease (NAFLD), non-alcoholic steatohepatitis (NASH), fatty pancreas disease, and fatty kidney disease.
Accordingly, in one aspect the present invention provides methods for identifying modulators of mammalian lipid metabolism.
The methods comprise the use of mammalian MST3, preferably human MST3.
The methods can comprise determination of MST3 activity and/or MST3 expression.
MST3 activity and/or MST3 expression can be determined in mammalian cells expressing MST3. The mammalian cells can be cells with constitutive MST3 expression or cells overexpressing recombinant MST3.
The mammalian cells can be human or rodent cells.
In one embodiment the method according to the invention comprises a method for identifying an agent capable of modulating the activity and/or expression of MST3, which method comprises: (i) contacting a candidate compound modulator with a host-cell which expresses a polynucleotide sequence encoding a MST3 polypeptide; and (ii) determining an effect of the candidate compound modulator on the activity and/or expression of MST3 thereby identifying the compound as a MST3 modulator, and thereby identifying the compound as a potential modulator of mammalian lipid metabolism.
MST3 activity can be determined by measurement of lipid deposition, lipid catabolism e.g. fatty acid oxidation and/or lipid secretion, and/or lipid anabolism, e.g. lipid uptake and/or lipid synthesis. Since lipid deposition regulates insulin sensitivity, also the insulin sensitivity parameters such as insulin-stimulated glucose uptake (ISGU) can be used as a measure of MST3 activity.
MST3 expression can be determined using techniques such as quantitative real-time PCR (qRT-PCR), Western blot, or proximity ligation assay (PLA).
In another embodiment the method according to the invention comprises a method for identifying an agent capable of modulating the activity of MST3, which method comprises: (i) contacting a candidate compound modulator with a MST3 polypeptide; and (ii) determining an effect of the candidate compound modulator on the activity of MST3 to thereby identify the compound as a MST3 modulator, and thereby identifying the compound as a potential modulator of mammalian lipid metabolism.
MST3 activity can be determined using an MST3 polypeptide, preferably a recombinantly produced and purified MST3 polypeptide, and an MST3 peptide substrate, and determining the level of phosphorylation of the peptide substrate as a measure of MST3 activity.
In yet another embodiment the method according to the invention comprises a method for identifying an agent capable of modulating the activity of MST3, which method comprises: (i) contacting a candidate compound modulator with an MST3 polypeptide; and (ii) determining the binding of the candidate compound modulator to MST3 to thereby identify the compound as an MST3 binder, and thereby identifying the compound as a potential modulator of mammalian lipid metabolism.
MST3 binding can be determined using an MST3 polypeptide, preferably a recombinantly produced and purified MST3 polypeptide, and candidate compound, and determining the effect of the compound on the melting temperature of MST3 as described by Olesen et al. 2016.
The MST3 polypeptide can be a human MST3. The amino acid sequence of human MST3 can e.g. be found in UniProtKB database accession nr—Q9Y6E0 (STK24_HUMAN) and in the NCBI GenBank database accession nr NP_003567, here identified as SEQ ID NO:2.
The MST3 polypeptide according to the invention can comprise the amino acid sequence according to SEQ ID NO:2 or a variant of thereof having at least 80% sequence identity to the amino acid sequence according to SEQ ID NO:2 or a functionally active fragment thereof.
Functionally active fragments of MST3 are defined as MST3 polypeptides retaining at least 90% MST3 kinase activity, such as least 80%, 70%, 60%, or 50% MST3 kinase activity, as compared to the MST3 kinase activity of the MST3 polypeptide having the amino acid sequence according to SEQ ID NO:2.
Methods for screening for modulators of MST3 can be based on the use of a recombinantly produced and purified MST3 polypeptide and a MST3 peptide substrate. Enzymatic assays, such as TR-FRET or ADP hunter assay, can be adapted for MST3 assays, and used to determine the level of phosphorylation of the peptide substrate.
Selectivity of identified modulators can be assessed against a panel of kinases using standard radiometric filter plate assay. Surface plasmon resonance (SPR) can be used to assess binding of candidate compounds to MST3.
Candidate compounds which may be tested in the methods according to the invention include simple organic molecules, commonly known as “small molecules”, for example those having a molecular weight of less than 2000 Daltons. The methods may also be used to screen compound libraries such as peptide libraries, including synthetic peptide libraries and peptide phage libraries.
Once a modulator, i.e. an inhibitor or stimulator, of MST3 activity is identified then medicinal chemistry techniques can be applied to further refine its properties, for example to enhance efficacy and/or reduce side effects.
Other suitable candidate molecules include oligonucleotides and polynucleotides, such as dsRNA, siRNA, shRNA, miRNA and anti-sense RNA or DNA, and any other molecules which potentially can modulate the activity and/or expression of MST3.
The cDNA sequence encoding human MST can be e.g. found in the NCBI GenBank database accession nr NM_003576, here identified as SEQ ID NO:1.
Preferred oligonucleotides and polynucleotides consist of 8-80 bases in length, comprising a sequence hybridisable to the nucleic acid sequence SEQ ID NO:1.
It will be appreciated that there are many procedures known in the art which may be employed to perform the present invention. Examples of suitable procedures which may be used to identify a MST3 modulator include rapid filtration of equilibrium binding mixtures, enzyme linked immunosorbent assays (ELISA), radioimmunoassays (RIA) and fluorescence resonance energy transfer assays (FRET), scintillation proximity assay (SPA), electrophoretic mobility shift assay (EMSA), chromatin immunoprecipitation analysis (ChIP), surface plasmon resonance (SPR), qRT-PCR, Western blot, and PLA assays.
In a second aspect the present invention provides compounds, pharmaceutical composition, and methods for the treatment of metabolic diseases.
In one embodiment the invention provides oligonucleotides and polynucleotides consisting of 8-80 bases in length, comprising a sequence hybridisable to the nucleic acid sequence SEQ ID NO: 1 or the complementary sequences thereto for use in the treatment of metabolic diseases.
In another embodiment the invention provides a pharmaceutical composition comprising an oligonucleotide or a polynucleotide consisting of 8-80 bases in length, comprising a sequence hybridisable to the nucleic acid sequence SEQ ID NO:1 or the complementary sequences thereto for use in the treatment of metabolic diseases.
In another embodiment the invention provides oligonucleotides and polynucleotides consisting of 8-80 bases in length, comprising a sequence hybridisable to the nucleic acid sequence SEQ ID NO: 1 or the complementary sequences thereto for use in the manufacture of a medicament for the treatment of metabolic diseases.
In yet another embodiment the invention provides methods for treatment of metabolic diseases comprising administering a pharmaceutical effective amount of an oligonucleotide or a polynucleotide consisting of 8-80 bases in length, comprising a sequence hybridisable to the nucleic acid sequence SEQ ID NO:1 or the complementary sequences thereto to a subject in need of such treatment.
The metabolic disease can be selected from, but not limited to, obesity, type 2 diabetes (T2D), non-alcoholic fatty liver disease (NAFLD), non-alcoholic steatohepatitis (NASH), fatty pancreas disease, and fatty kidney disease.
Preferred oligonucleotides and polynucleotides are dsRNA, siRNA, shRNA, miRNA and anti-sense RNA or DNA.
The oligonucleotides and polynucleotides can be 8-80 bases in length, preferable 8-70, 8-60, 8-50, 8-40, or 8-30 bases in length.
A nucleotide in the antisense oligonucleotide or polynucleotide may be an RNA residue, a DNA residue, or a nucleotide analogue.
Antisense oligonucleotides and polynucleotides may be selected from the group consisting of a peptide nucleic acid (PNA), a phosphorodimidate mopholino oligomer (PMO), and a phosphorothioate oligonucleotide (PS-ODN).
Immortalised human hepatocytes (IHHs; liver cell line of human origin) were maintained in Complete William's E medium (Gibco, Paisley, UK) supplemented with bovine insulin (20 U/1; Sigma-Aldrich, St Louis, MO, USA) and dexamethasone (50 nmol/l; Sigma-Aldrich). Culture medium was also supplemented with 10% (vol./vol.) fetal bovine serum (FBS), L-glutamine (2 mmol/l), and 1% (vol./vol.) penicillin/streptomycin (Gibco). After transfections, cells were incubated with oleic acid (OA) for 48 h, which is known to efficiently induce steatosis in vitro (Amrutkar et al. 2016).
MST3 was depleted by small interfering RNA (siRNA) technique using Lipofectamine RNAiMax (Invitrogen, San Diego, CA, USA), according to manufacturer's instructions. The efficient target depletion was confirmed by Western blot using anti-MST3 antibodies.
To measure lipid storage, transfected cells were stained with Oil Red O for neutral lipids as previously described (Amrutkar et al. 2016). In addition, for lipidomic analysis, lipids were extracted using the Folch method (Folch et al. 1957) and quantified using ultraperformance liquid chromatography/mass spectrometry and direct-infusion mass spectrometry (Stahlman et al. 2013).
To measure β-oxidation, transfected cells were incubated in the presence of [9,10-3H(N)]-palmitic acid, and [3H]-labelled water was measured as the product of free fatty acid oxidation as previously described (Nerstedt et al. 2012).
To measure triacylglycerol (TAG) secretion, transfected cells were incubated with pulse media [Complete William's E containing 18,500 Bq/ml [3H]OA (PerkinElmer, Waltham, MA, USA), 360 μmol/l OA (Sigma-Aldrich), and 1% vol./vol. fatty acid-free BSA] for 8 h, followed by incubation with chase media (Complete William's E supplemented with 30% vol./vol. fatty acid-free BSA) for up to 8 h. Media was collected for lipid extraction, followed by lipid separation by thin-layer chromatography on silica gel plates. Radiolabelled TAG was detected by iodine vapor and quantified by a scintillation counter.
The oleic acid (OA) uptake was measured using the Quencher-Based Technology (QBT) Fatty Acid Uptake Assay Kit (Molecular Devices, San Jose, CA, USA), according to manufacturer's instructions.
Incorporation of Oleic Acid and Glucose into Triacylglycerol
The incorporation of [14C] OA and [14C] glucose into TAG was measured as previously described (Amrutkar et al. 2016).
Liquid Chromatography Mass Spectrometry (LC-MS) Analysis in Lipid Droplets from Mouse Liver
Male mice of C57BL6/J genetic background were fed a pelleted high-fat diet (45% kilocalories from fat; D12451; Research Diets, New Brunswick, NJ, USA) for 16-18 weeks. The mice were killed and lipid droplets (LDs) were isolated from freshly excised livers using the method of Zhang et al (Zhang et al. 2011). LC-MS analysis was performed as previously described (Chursa et al. 2017) with the following modifications. The proteins from LD extract were precipitated using ProteoExtract Kit (Millipore, Burlington, MA, USA) and dissolved in buffer [50 mmol/l triethylammonium bicarbonate (TEAB), 4% SDS] prior to protein concentration determination. Total protein TMT 10-plex sets were fractionated using Pierce High pH Reversed-Phase Peptide Fractionation Kit to 8 fractions prior to LC-MS analysis.
MST3 is Associated with Lipid Droplets in Mouse Liver
Global quantitative phosphoproteomics was performed by LC-MS technique in lipid droplets (LDs) isolated from the livers of high-fat diet-fed mice to identify valid constituents of the hepatic LD proteome. It has been previously shown that the LD fraction prepared by this isolation protocol is largely free of contamination as assessed by the relative enrichment of LD-resident proteins and the absence of markers that correspond to other intracellular compartments (Zhang et al. 2011). Notably Zhang failed to identify MST3 as a component of the LD fraction.
Surprisingly, the present study demonstrates that MST3, as well as phospho-MST3 (Thr172), are present in the LD fraction, which provides the first evidence that this kinase is associated with LDs in mouse liver.
Depletion of MST3 in Human Hepatocytes Suppresses Lipid Accumulation through Increased β-Oxidation and TAG Secretion Combined with Reduced Free Fatty Acid Uptake and Lipid Synthesis
Because of its subcellular localization on liver LDs, it is concluded that MST3 regulates hepatic lipid metabolism. To investigate the possible impact of MST3 on lipid catabolism and anabolism in the liver, human IHHs were transfected with MST3-specific siRNA or with an NTC siRNA. In cells transfected with MST3 siRNA, the protein levels of MST3 were significantly reduced as assessed by Westem blot (
Before metabolic assessments, the transfected cells were incubated with OA for 48 h, which is known to efficiently induce steatosis in vitro. Notably, cellular lipid storage and FFA uptake were studied both with and without OA incubation.
Knockdown of MST3 significantly reduced intrahepatocellular lipid accumulation as assessed by Oil Red O staining for neutral lipids (
In this study, the present inventor provides the first evidence that MST3 is associated with intracellular lipid droplets in liver. Hepatic lipid droplets, once thought to be only inert energy storage depots, are increasingly recognized as organelles that play a key role in the regulation of liver lipid partitioning (Mashek et al. 2015) providing a substrate for mitochondrial β-oxidation and secretion of very low-density lipoproteins (VLDL)-triacylglycerol (TAG). Because of its localization on liver lipid droplets, we hypothesized that MST3 regulates hepatic lipid storage. Indeed, it is demonstrated that siRNA knockdown of MST3 in human cultured hepatocytes significantly reduced intracellular lipid accumulation. There are several possible mechanisms that could underlie the suppression in lipid storage in hepatocytes where MST3 is deleted: (i) reduced rates of lipid uptake and synthesis, (ii) increased lipid secretion as TAG-rich VLDLs, (iii) enhanced levels of fatty acid oxidation—or any combination of these mechanisms. Indeed, it is demonstrated that MST3 regulates the metabolic balance of lipid catabolism versus lipid anabolism in hepatocytes, as it is demonstrated that depletion of MST3 stimulated β-oxidation and TAG secretion and inhibited FFA influx and TAG synthesis (
In summary, the present disclosure provides consistent evidence for a cell-specific role of lipid droplet-associated protein MST3 in regulation of liver lipid storage. Importantly, large body of recent evidence suggests that ectopic lipid accumulation in the liver, also known as nonalcoholic fatty liver disease (NAFLD), exacerbates hepatic and systemic insulin resistance and actively contributes to the pathogenesis of type 2 diabetes and metabolic syndrome (Anstee et al. 2013).
Furthermore, hepatic lipid storage is the main risk factor for development of aggressive liver disease nonalcoholic steatohepatitis (NASH) (Anstee et al. 2013).
Consequently, the present disclosure highlights MST3 modulators as potential drug candidates for the prevention and treatment of NAFLD/NASH and related complex metabolic diseases.
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The material in the XML file, named “NOVI-71218US2-Sequence-Listing.xml”, created Feb. 26, 2025, file size of 8,192 bytes, is hereby incorporated by reference.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1730249-8 | Sep 2017 | SE | national |
This application is a continuation of U.S. application Ser. No. 17/129,311, filed Dec. 21, 2020, which is a divisional of U.S. application Ser. No. 16/634,996, filed Jan. 29, 2020, which is a national stage application of International Appl. PCT/SE2018/050918, filed Sep. 12, 2018, and which claims priority of Swedish Patent Appl. No. 1730249-8, filed Sep. 13, 2017, all of which are hereby incorporated by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16634996 | Jan 2020 | US |
| Child | 17129311 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17129311 | Dec 2020 | US |
| Child | 19063933 | US |
