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Metabolic crosstalk between skeletal muscle cells and liver through IRF4-FSTL1 in nonalcoholic steatohepatitis

ABSTRACT: Inter-organ crosstalk has gained more and more attention recently. However, the mechanisms under this remain incompletely understood. Here, we revealed an endocrine pathway regulated by skeletal muscle IRF4 that manipulates liver pathology. We studied that skeletal muscle specifically deleted IRF4 (F4MKO) mice showed ameliorated liver steatosis, inflammation and fibrosis, without changes in body weight on NASH diet. Proteomics analysis of serum suggested that follistatin-like protein 1 (FSTL1), as a myokine, might linked the communication between skeletal muscle and liver. Dual luciferase assays showed that IRF4 can transcriptionally regulated FSTL1 and reconstitution of FSTL1 expression in skeletal muscle of F4MKO mice, using adeno-associated virus, was sufficient to restore the liver pathology. Furthermore, we performed co-culture experiments to verify different receptors contribute to FSTL1’s function in different cell types of liver. Finally, we found serum FSTL1 level was positively correlated with NASH progression in human, whereas the mRNA level of Fstl1 and its receptors were downregulated in liver biopsy from NASH patients. These data reveal a signaling pathway from skeletal muscle to liver via IRF4-FSTL1-receptors in the pathogenesis of NASH and implicate useful targets for the management of NASH.

ORGANISM(S): Mus musculus

PROVIDER: GSE216378 | GEO | 2023/09/11

REPOSITORIES: GEO

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Metabolic crosstalk between skeletal muscle cells and liver through IRF4-FSTL1 in 2 nonalcoholic steatohepatitis

Project description:In this study Guo et al. revealed an endocrine pathway regulated by skeletal muscle IRF4 that manipulates liver pathology. Mice with skeletal muscle specific ablation of IRF4 show ameliorated liver steatosis, inflammation, and fibrosis, without changes in body weight on nonalcoholic steatohepatitis (NASH) diet. Proteomics analysis of mouse serum suggested that follistatin-like protein 1 (FSTL1) might link the communication between muscle and liver. Dual luciferase assays showed that IRF4 could transcriptionally regulate FSTL1 and reconstitution of FSTL1 expression in muscle of F4MKO mice was sufficient to restore the liver pathology. Furthermore, co-culture experiments verified that FSTL1 exerts its function in hepatocyte, macrophage, and hepatic satellite cells through CD14 and DIP2A, CD14, DIP2A, respectively. In human, serum FSTL1 is increased in NASH patients, but the mRNA level of Fstl1 and its receptors are decreased in NASH liver biopsy, suggesting the increased serum FSTL1 is from skeletal muscle as studied in F4MKO mice. These data unveiled a signaling pathway from skeletal muscle to liver via IRF4-FSTL1-DIP2A/CD14 in the pathogenesis of NASH.

2023-09-13 | PXD045324 | Pride

FSTL1 promotes keratinocyte migration.

Project description:This study identifies FSTL1 as key component of intiating keratinocyte migration in skin Total RNA from N/TERT-1 keratinocytes transfected with a non-targeting siRNA or Smartpool siRNA against FSTL1 were subjected to microarray analysis

2013-03-02 | E-GEOD-41615 | biostudies-arrayexpress

FSTL1 promotes keratinocyte migration.

Project description:This study identifies FSTL1 as key component of intiating keratinocyte migration in skin

2013-03-02 | GSE41615 | GEO

Expression data from Chinese renal cell carcinoma cells with FSTL1 knocked down

Project description:Clear cell renal cell carcinoma (ccRCC), the major histotype of cancer derived from kidney, is lack of robust prognostic and/or predictive biomarker and powerful therapeutic target. We previously identified that follistatin-like protein 1 (FSTL1) was significantly down-regulated in ccRCC at the transcription level. In the present study, we characterized, for the first time, that FSTL1 immunostaining was selectively positive in the cytoplasm of distal convoluted tubules. The expression of FSTL1 was significantly lower in ccRCC tissues than in adjacent renal tissues (P<0.001), as measured using immunohistochemistry in 69 patients with paired specimens, and lower in most ccRCC cell lines than in human embryonic kidney cells, as measured by quantitative RT-PCR. Multivariate Cox regression analysis in 89 patients with follow-up data showed that FSTL1 expression in tumors conferred a favorable postoperative prognosis independently, with a hazard ratio of 0.325 (95% confidence interval: 0.118-0.894). FSTL1 knockdown promoted anchorage independent growth, mobility, and invasion of ccRCC cell lines and promoted cell cycle from G0/G1 phases into S phase; while over-expression of FSTL1 significantly attenuated cell migration ability in ACHN cells. FSTL1 knockdown resulted in decreased expression of E-cadherin and increased expression of N-cadherin in ccRCC cell lines significantly, indicating that FSTL1 may attenuate epithelial to mesenchymal transition in ccRCC. Microarray assay indicated that NF-ÎºB and HIF-2Î± pathways were activated following FSTL1 knockdown in ccRCC cells. Our study indicates that FSTL1 serves as a tumor suppressor in ccRCC, up-regulation of FSTL1 in cancer cells may be a candidate target therapy for advanced ccRCC. RNA samples were collected from NRCC-shsiscramble, NRCC-shFSTL1-1 and NRCC-shFSTL1-2 cells. Then samples were hybridized to Affymetrix arrays for mRNA profiling.

2016-01-20 | E-GEOD-76948 | biostudies-arrayexpress

Single-cell Transcriptome analysis reveals cellular heterogeneity and highlights Fstl1-regulated alveolar myofibroblasts in mouse lung at birth

Project description:The matricellular protein follistatin-like 1 (FSTL1) regulates lung development and saccular formation. Here, we employed single-cell RNA sequencing (scRNA-seq) to construct a transcriptomic atlas of 22,774 individual cells in wild-type (WT) and Fstl1–/– lung (E18.5) samples and identified 27 cell subtypes. We reveal abnormal population sizes and gene expression profiles in diverse cell subtypes in Fstl1–/– lung samples. We identify Pdgfra and Tgfbi as genetic markers specifically expressed in postnatal myofibroblasts (MyoFBs). Fstl1 deletion decreases the number of MyoFB cells and downregulates their roles in ECM organization and muscle tissue/vasculature development, in part, through the TGF-β1/BMP4 signaling pathway. Our data provide a single-cell view of the cellular heterogeneity and the molecular mechanisms underlying abnormal saccular formation and atelectatic lungs in Fstl1–/– mice.

2023-11-03 | GSE225463 | GEO

Expression data from Chinese renal cell carcinoma cells with FSTL1 knocked down

Project description:Clear cell renal cell carcinoma (ccRCC), the major histotype of cancer derived from kidney, is lack of robust prognostic and/or predictive biomarker and powerful therapeutic target. We previously identified that follistatin-like protein 1 (FSTL1) was significantly down-regulated in ccRCC at the transcription level. In the present study, we characterized, for the first time, that FSTL1 immunostaining was selectively positive in the cytoplasm of distal convoluted tubules. The expression of FSTL1 was significantly lower in ccRCC tissues than in adjacent renal tissues (P<0.001), as measured using immunohistochemistry in 69 patients with paired specimens, and lower in most ccRCC cell lines than in human embryonic kidney cells, as measured by quantitative RT-PCR. Multivariate Cox regression analysis in 89 patients with follow-up data showed that FSTL1 expression in tumors conferred a favorable postoperative prognosis independently, with a hazard ratio of 0.325 (95% confidence interval: 0.118-0.894). FSTL1 knockdown promoted anchorage independent growth, mobility, and invasion of ccRCC cell lines and promoted cell cycle from G0/G1 phases into S phase; while over-expression of FSTL1 significantly attenuated cell migration ability in ACHN cells. FSTL1 knockdown resulted in decreased expression of E-cadherin and increased expression of N-cadherin in ccRCC cell lines significantly, indicating that FSTL1 may attenuate epithelial to mesenchymal transition in ccRCC. Microarray assay indicated that NF-κB and HIF-2α pathways were activated following FSTL1 knockdown in ccRCC cells. Our study indicates that FSTL1 serves as a tumor suppressor in ccRCC, up-regulation of FSTL1 in cancer cells may be a candidate target therapy for advanced ccRCC.

2016-01-20 | GSE76948 | GEO

Obese Skeletal Muscle-Expressed Interferon Regulatory Factor 4 Transcriptionally Regulates Mitochondrial Branched-Chain Aminotransferase Reprogramming Metabolome

Project description:It is well established that obese animals and humans show deficiencies in skeletal muscle content and metabolism. However, the mechanisms under how skeletal muscle metabolism affects systemic energy homeostasis is not well-defined. Here, we compared the skeletal muscle transcriptome from obese and lean controls in different species. We found an immune-responsive transcription factor interferon regulatory factor 4 (IRF4) was conserved to be increased in obese subjects from the three species (humans, non-human primates and mice). Thus, we demonstrated that loss of IRF4 specifically in skeletal muscle of mice showed protection against the metabolic effects of high-fat diet, with unexpected increased plasma and muscle branched-chain amino acid (BCAA) levels. Conversely, overexpression of skeletal muscle IRF4 caused obesity and insulin resistance, with decreased BCAA contents. Mechanistically, IRF4 can transcriptionally regulate branched-chain aminotransferase isozyme (BCATm) expression, and that overexpression of BCATm can reverse the effects of IRF4 depletion regarding to metabolic phenotypes. Further, we demonstrated ablation of IRF4 in skeletal muscle increased mitochondrial activity and glycogen synthesis in a BCATm- dependent manner. These studies establish IRF4 as a novel driver of BCAA metabolism via BCATm in skeletal muscle and may interpret the BCAAs paradox in obesity.

2023-12-12 | GSE180906 | GEO

Metabolic regulation of BCAAs and glycogen via IRF4 in skeletal muscle

Project description:Skeletal muscle is not only a primary site for glucose uptake and storage, but also a reservoir for amino acids stored as protein. How the metabolism of these two fuels is coordinated in skeletal muscle is incompletely understood. Here, we demonstrate that interferon regulatory factor 4 (IRF4) integrate glucose and amino acids flux by regulating glycogen synthesis and branched-chain-amino acid (BCAA) metabolism in skeletal muscle. Mice with IRF4 specifically knocked out in skeletal muscle (MI4KO) showed elevated plasma BCAAs and skeletal muscle glycogen content, decreased adiposity and body weight, along with increased energy expenditure, remarkable improvements in glucose and insulin tolerance, and protection from diet-induced obesity (DIO). Loss of IRF4 caused downregulation of the mitochondrial branched-chain aminotransferase isozyme (BCATm) in myocytes, which encodes for the enzyme catalyzing the first step of BCAA metabolism. Lack of IRF4 also led to the upregulation of protein targeting to glycogen (PTG), which is associated with enhanced mitochondrial Complex II activity and mitochondria number. Additionally, overexpression of IRF4 in skeletal muscle caused obesity and reduced exercise capacity. Mechanistically, we found that IRF4 directly regulates both BCATm and PTG expression, and that overexpression of BCATm can partially reverse the effects of IRF4 deletion. These studies establish IRF4 as a novel driver of both glucose and BCAA metabolism in skeletal muscle.

2019-08-30 | GSE136623 | GEO

Loss of FSTL1 in the Myf5 lineage causes brown adipose tissue atrophy

Project description:Aim to investigate the role of FSTL1 in brown adipose tissue (BAT) development and function

2021-12-31 | GSE148888 | GEO

Expression data from FSTL1 antibody treatment for 6 hours in CL1-0 lung cancer cell line.

Project description:We demonstrate that FSTL1 down-regulation shRNAs significantly increased cell migration and invasion in lung cancer cell lines in vitro, as well as in lung metastases in vivo We used microarrays to analyze the FSTL1 regulated gene expression underlying invasion-metastasis cascade.

2021-03-31 | GSE79682 | GEO

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