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Mohsin MA, Yu H, He R, Wang P, Gan L, Du Y, Huang Y, Abro MB, Sohaib S, Pierzchala M, Sobiech P, Miętkiewska K, Pareek CS, He BX. Differentiation of Subclinical Ketosis and Liver Function Test Indices in Adipose Tissues Associated With Hyperketonemia in Postpartum Dairy Cattle. Front Vet Sci 2022; 8:796494. [PMID: 35187139 PMCID: PMC8850981 DOI: 10.3389/fvets.2021.796494] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Accepted: 12/28/2021] [Indexed: 11/17/2022] Open
Abstract
Past studies suggested that during early lactation and the transition period, higher plasma growth hormone (GH) levels in subclinical ketosis (SCK) might involve the initiation of body adipose tissues mobilization, resulting in metabolic disorders in ruminants particularly hyperketonemia. The upregulated GH mRNA expression in adipose tissue may take part in the adipolysis process in SCK-affected cows that paves a way for study further. This study aimed to characterize the plasma levels of GH, β-hydroxybutyrate acid (BHBA) and non-esterified fatty acid (NEFA) and glucose (GLu) in ketotic cows and healthy control (CON) cows; to measure the liver function test (LFT) indices in ketotic and healthy CON cows, and finally the quantitative real-time PCR (qRT-PCR) assay of candidate genes expressed in adipose tissues of ketotic and healthy CON cows during 0 to 7 week postpartum. Three experiments were conducted. Experiment-1 involved 21 Holstein cows weighing 500–600 kg with 2–5 parities. Results showed that GH, BHBA, and NEFA levels in ketotic cows were significantly higher and the GLu level significantly lower. Pearson's correlation analysis revealed a significant positive correlation of GH with BHBA, NEFA, and GLu in ketotic and healthy CON cows. In experiment-2, dynamic monitoring of LFT indices namely, alanine aminotransferase (ALT), aspartate aminotransferase (AST), γ-glutamyl transpeptidase (GGT), total bilirubin (TBIL), direct bilirubin (DBIL), total protein (TP), albumin (ALB), globulin (GLOB) and albumin/globulin (A/G) were examined. The TBIL, DBIL, and GGT indices were significantly higher in ketotic cows and TP was significantly lower. In experiment-3, mRNA expression levels of GHR and peroxisome-proliferator-activated receptor alpha (PPARα) genes in adipose tissue were significantly upregulated in ketotic cows. However, the mRNA expression of insulin-like growth factor-I (IGF-1), insulin-like growth factor-I receptor (IGF-1R), and sterol regulatory element-binding protein-1c (SREBP-1c) genes in adipose tissue were downregulated in ketotic cows. Our study concluded that during postpartum, higher plasma GH levels in SCK cows might involve the initiation of body adipose tissue mobilization, resulting in hyperketonemia.
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Affiliation(s)
- Muhammad Ali Mohsin
- Laboratory of Clinical Veterinary Medicine, College of Animal Science and Technology, Guangxi University, Nanning, China
| | - Huiru Yu
- Laboratory of Clinical Veterinary Medicine, College of Animal Science and Technology, Guangxi University, Nanning, China
- Shanghai Animal Disease Prevention and Control Center, Shanghai, China
| | - Rongze He
- Laboratory of Clinical Veterinary Medicine, College of Animal Science and Technology, Guangxi University, Nanning, China
| | - Peng Wang
- Laboratory of Clinical Veterinary Medicine, College of Animal Science and Technology, Guangxi University, Nanning, China
| | - Linli Gan
- Laboratory of Clinical Veterinary Medicine, College of Animal Science and Technology, Guangxi University, Nanning, China
| | - Yulan Du
- Laboratory of Clinical Veterinary Medicine, College of Animal Science and Technology, Guangxi University, Nanning, China
| | - Yunfei Huang
- School of Life Science and Engineering, Foshan University, Guangdong, China
| | - Muhammad Bakhsh Abro
- Department of Veterinary Medicine, Faculty of Veterinary and Animal Science, Lasbela University of Agriculture, Water, and Marine Sciences, Uthal, Pakistan
| | - Sarmad Sohaib
- Department of Veterinary Medicine, Faculty of Veterinary and Animal Science, Lasbela University of Agriculture, Water, and Marine Sciences, Uthal, Pakistan
| | - Mariusz Pierzchala
- Department of Genomics and Biodiversity, Institute of Genetics and Animal Biotechnology of the Polish Academy of Sciences, Jastrzebiec, Poland
| | - Przemysław Sobiech
- Internal Disease Unit, Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Klaudia Miętkiewska
- Department of Basic and Preclinical Sciences, Institute of Veterinary Medicine, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Torun, Poland
- Division of Functional Genomics in Biological and Biomedical Research, Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University, Torun, Poland
| | - Chandra S. Pareek
- Department of Basic and Preclinical Sciences, Institute of Veterinary Medicine, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Torun, Poland
- Division of Functional Genomics in Biological and Biomedical Research, Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University, Torun, Poland
| | - Bao Xiang He
- Laboratory of Clinical Veterinary Medicine, College of Animal Science and Technology, Guangxi University, Nanning, China
- *Correspondence: Bao Xiang He
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Able AA, Richard AJ, Stephens JM. Loss of DBC1 (CCAR2) affects TNFα-induced lipolysis and Glut4 gene expression in murine adipocytes. J Mol Endocrinol 2018; 61:195-205. [PMID: 30139876 PMCID: PMC6193813 DOI: 10.1530/jme-18-0154] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 07/30/2018] [Accepted: 08/23/2018] [Indexed: 01/01/2023]
Abstract
STAT5A (signal transducer and activator of transcription 5A) is a transcription factor that plays a role in adipocyte development and function. In this study, we report DBC1 (deleted in breast cancer 1; also known as CCAR2) as a novel STAT5A-interacting protein. DBC1 has been primarily studied in tumor cells, but there is evidence that loss of this protein may promote metabolic health in mice. Currently, the functions of DBC1 in mature adipocytes are largely unknown. Using immunoprecipitation and immunoblotting techniques, we confirmed that there is an association between endogenous STAT5A and DBC1 proteins under physiological conditions in the adipocyte nucleus that is not dependent upon STAT5A tyrosine phosphorylation. We used siRNA to knockdown DBC1 in 3T3-L1 adipocytes to determine the impact on STAT5A activity, adipocyte gene expression, and TNFα (tumor necrosis factor α)-regulated lipolysis. The loss of DBC1 did not affect the expression of several STAT5A target genes including Socs3, Cish, Bcl6, Socs2, and Igf1 However, we did observe decreased levels of TNFα-induced glycerol and free fatty acids released from adipocytes with reduced DBC1 expression. In addition, DBC1-knockdown adipocytes had increased Glut4 expression. In summary, DBC1 can associate with STAT5A in adipocyte nucleus, but it does not appear to impact regulation of STAT5A target genes. Loss of adipocyte DBC1 modestly increases Glut4 gene expression and reduces TNFα-induced lipolysis. These observations are consistent with in vivo observations that show loss of DBC1 promotes metabolic health in mice.
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Affiliation(s)
- Ashley A. Able
- Adipocyte Biology Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA 70808
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803
| | - Allison J. Richard
- Adipocyte Biology Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA 70808
| | - Jacqueline M. Stephens
- Adipocyte Biology Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA 70808
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803
- To whom correspondence should be addressed, Jacqueline Stephens, Louisiana State University, Pennington Biomedical Research Center, Baton Rouge, LA 70808, Phone (225)-763-2648, FAX (225)-763-0273,
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Fenugreek supplementation during high-fat feeding improves specific markers of metabolic health. Sci Rep 2017; 7:12770. [PMID: 28986580 PMCID: PMC5630574 DOI: 10.1038/s41598-017-12846-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 09/14/2017] [Indexed: 12/12/2022] Open
Abstract
To assess the metabolically beneficial effects of fenugreek (Trigonella foenum-graecum), C57BL/6J mice were fed a low- or high-fat diet for 16 weeks with or without 2% (w/w) fenugreek supplementation. Body weight, body composition, energy expenditure, food intake, and insulin/glucose tolerance were measured regularly, and tissues were collected for histological and biochemical analysis after 16 weeks of diet exposure. Fenugreek did not alter body weight, fat mass, or food intake in either group, but did transiently improve glucose tolerance in high fat-fed mice. Fenugreek also significantly improved high-density lipoprotein to low-density lipoprotein ratios in high fat-fed mice without affecting circulating total cholesterol, triglycerides, or glycerol levels. Fenugreek decreased hepatic expression of fatty acid-binding protein 4 and increased subcutaneous inguinal adipose tissue expression of adiponectin, but did not prevent hepatic steatosis. Notably, fenugreek was not as effective at improving glucose tolerance as was four days of voluntary wheel running. Overall, our results demonstrate that fenugreek promotes metabolic resiliency via significant and selected effects on glucose regulation, hyperlipidemia, and adipose pathology; but may not be as effective as behavioral modifications at preventing the adverse metabolic consequences of a high fat diet.
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Zhao P, Stephens JM. Identification of STAT target genes in adipocytes. JAKSTAT 2014; 2:e23092. [PMID: 24058802 PMCID: PMC3710315 DOI: 10.4161/jkst.23092] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Revised: 12/02/2012] [Accepted: 12/03/2012] [Indexed: 02/08/2023] Open
Abstract
Adipocytes play important roles in lipid storage, energy homeostasis and whole body insulin sensitivity. Studies in the last two decades have identified the hormones and cytokines that activate specific STATs in adipocytes in vitro and in vivo. Five of the seven STAT family members are expressed in adipocyte (STATs 1, 3, 5A, 5B and 6). Many transcription factors, including STATs, have been shown to play an important role in adipose tissue development and function. This review will summarize the importance of adipocytes, indicate the cytokines and hormones that utilize the JAK-STAT signaling pathway in fat cells and focus on the identification of STAT target genes in mature adipocytes. To date, specific target genes have been identified for STATs, 1, 5A and 5B, but not for STATs 3 and 6.
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Affiliation(s)
- Peng Zhao
- Department of Biological Sciences; Louisiana State University; Baton Rouge, LA USA ; Adipocyte Biology Lab; Pennington Biomedical Research Center; Baton Rouge, LA USA
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The role of JAK-STAT signaling in adipose tissue function. Biochim Biophys Acta Mol Basis Dis 2013; 1842:431-9. [PMID: 23735217 DOI: 10.1016/j.bbadis.2013.05.030] [Citation(s) in RCA: 125] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 05/20/2013] [Accepted: 05/22/2013] [Indexed: 01/14/2023]
Abstract
Adipocytes play important roles in lipid storage, energy homeostasis and whole body insulin sensitivity. The JAK-STAT (Janus Kinase-Signal Transducer and Activator of Transcription) pathway mediates a variety of physiological processes including development, hematopoiesis, and inflammation. Although the JAK-STAT signaling pathway occurs in all cells, this pathway can mediate cell specific responses. Studies in the last two decades have identified hormones and cytokines that activate the JAK-STAT signaling pathway. These cytokines and hormones have profound effects on adipocytes. The content of this review will introduce the types of adipocytes and immune cells that make up adipose tissue, the impact of obesity on adipose cellular composition and function, and the general constituents of the JAK-STAT pathway and how its activators regulate adipose tissue development and physiology. A summary of the identification of STAT target genes in adipocytes reveals how these transcription factors impact various areas of adipocyte metabolism including insulin action, modulation of lipid stores, and glucose homeostasis. Lastly, we will evaluate exciting new data linking the JAK-STAT pathway and brown adipose tissue and consider the future outlook in this area of investigation. This article is part of a Special Issue entitled: Modulation of Adipose Tissue in Health and Disease.
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Zhang Y, Liu Y, Li X, Gao W, Zhang W, Guan Q, Jiang J, Frank SJ, Wang X. Effects of insulin and IGF-I on growth hormone- induced STAT5 activation in 3T3-F442A adipocytes. Lipids Health Dis 2013; 12:56. [PMID: 23631823 PMCID: PMC3653719 DOI: 10.1186/1476-511x-12-56] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Accepted: 04/18/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Growth hormone (GH) and insulin signaling pathways are known important regulators of adipose homeostasis. The cross-talk between GH and insulin signaling pathways in mature adipocytes is poorly understood. METHODS In the present study, the impact of insulin on GH-mediated signaling in differentiated 3T3-F442A adipocytes and primary mice adipocytes was examined. RESULTS Insulin alone did not induce STAT5 tyrosine phosphorylation, but enhanced GH-induced STAT5 activation. This effect was more pronounced when insulin was added 20 min prior to GH treatment. The above results were further confirmed by in vivo study, showing that insulin pretreatment potentiated GH- induced STAT5 tyrosine phosphorylation in visceral adipose tissues of C57/BL6 mice. In addition, our in vitro results showed that IGF-I had similar potentiating effect as insulin on GH-induced STAT5 activation. In vitro, insulin and IGF-I had an additive effect on GH- induced MAPK activation. CONCLUSION These results indicate that both insulin and IGF-I specifically potentiated GH mediated STAT5 activation in mature adipose cells. These findings suggest that insulin and GH, usually with antagonistic functions, might act synergistically to regulate some specific functions in mature adipocytes.
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Affiliation(s)
- Yuchao Zhang
- The Institute of Cell Biology, Shandong University School of Medicine, Jinan 250012, China
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Traum D, Timothee P, Silver J, Rose-John S, Ernst M, LaRosa DF. IL-10-induced gp130 expression in mouse mast cells permits IL-6 trans-signaling. J Leukoc Biol 2011; 91:427-35. [PMID: 22140267 DOI: 10.1189/jlb.0411209] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
It is reported that human and mouse mast cells express the IL-27R, which consists of WSX-1 (the IL-27Rα subunit) and the signal-transducing subunit gp130. Although it has been proposed that IL-27 may negatively regulate mast cell-dependent, immediate hypersensitivity responses directly, this has yet to be examined specifically. We found that mouse BMMC and primary peritoneal mast cells are unresponsive to IL-27. Consistent with this, gp130 protein in resting BMMC was not on the cell surface to a measurable degree but was found intracellularly, and data are consistent with incompletely processed N-linked glycosylation. Furthermore, BMMC constitutively expressed SOCS3, a major negative regulator of gp130 signaling. However, BMMC stimulation with IL-10 and consequential STAT3 activation increased gp130 expression, which resulted in a functional gp130 receptor on the BMMC cell surface. IL-10 has not been previously shown to regulate gp130 expression, which on the BMMC surface, permitted IL-6 trans-signaling, found to increase survival under limiting conditions and enhance IL-13 and TNF-α secretion. This study identifies factors that regulate mouse mast cell gp130 expression and signaling and makes conspicuous the limitations of using cultured mouse mast cells to study the effects of the IL-6/IL-12 cytokine family on mast cell biology.
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Affiliation(s)
- Daniel Traum
- Department of Medicine, University of Pennsylvania School of Medicine, 421 Curie Blvd., Philadelphia, PA 19104, USA
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Richard AJ, Stephens JM. Emerging roles of JAK-STAT signaling pathways in adipocytes. Trends Endocrinol Metab 2011; 22:325-32. [PMID: 21561789 PMCID: PMC3149764 DOI: 10.1016/j.tem.2011.03.007] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Revised: 03/16/2011] [Accepted: 03/30/2011] [Indexed: 01/14/2023]
Abstract
Twenty years ago, adipocytes were largely considered to be inert energy-storage depots. We now know that fat cells are highly insulin-sensitive with significant endocrine functions. Alterations in adipocyte development or function can contribute to metabolic disease, in particular type 2 diabetes. The current obesity epidemic that plagues many nations provides a strong rationale for understanding basic adipocyte biology. The JAK-STAT signaling pathway mediates the action of a variety of hormones that have profound effects on adipocyte development and function. In addition, adipocytes secrete hormones that utilize this signaling pathway. This review summarizes research on the expression and function of JAKs and STATs in adipocytes and highlights the roles of JAK-STAT-activating cytokines in adipose tissue.
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Affiliation(s)
| | - Jacqueline M. Stephens
- To whom correspondence should be addressed, Louisiana State University, Department of Biological Sciences, 202 Life Sciences Bldg., Baton Rouge, LA 70803, Phone (225)-578-1749, FAX (225)-578-2597,
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