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Eagle SR, Basantani MK, Preszler J, Sherry N, McIntyre P, Kershaw EE, Puccio AM, Okonkwo DO. Interaction of obesity and proteins associated with the NLRP3 inflammasome following mild traumatic brain injury. Sci Rep 2024; 14:10178. [PMID: 38702410 PMCID: PMC11068868 DOI: 10.1038/s41598-024-61089-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Accepted: 04/30/2024] [Indexed: 05/06/2024] Open
Abstract
The NOD-like receptor pyrin domain-containing protein 3 (NLRP3) inflammasome has been associated with worse outcomes from severe traumatic brain injury (TBI). The NLRP3 inflammasome is also strongly associated with other pro-inflammatory conditions, such as obesity. Little is known about the potential effect of mild TBI (mTBI) on the NLRP3 inflammasome and the extent to which modifying factors, such as obesity, may augment the inflammatory response to mTBI. The purpose of this study was to evaluate the association of NLRP3 inflammasome proteins with obese body mass index (BMI ≥ 30) within 24 h of mTBI after presenting to a level 1 trauma center emergency department. This is a secondary analysis of prospectively enrolled patients with mTBI who presented to the emergency department of one U.S. Level 1 trauma center from 2013 to 2018 (n = 243). A series of regression models were built to evaluate the association of NLRP3 proteins obtained from blood plasma within 24 h of injury and BMI as well as the potential interaction effect of higher BMI with NLRP3 proteins (n = 243). A logistic regression model revealed a significant association between IL-18 (p < 0.001) in mTBI patients with obese BMI compared to mTBI patients with non-obese BMI (< 30). Moderation analyses revealed statistically significant interaction effects between apoptotic speck-like protein (ASC), caspase-1, IL-18, IL-1β and obese BMI which worsened symptom burden, quality of life, and physical function at 2 weeks and 6 months post-injury. Higher acute concentrations of IL-1β in the overall cohort predicted higher symptoms at 6-months and worse physical function at 2-weeks and 6-months. Higher acute concentrations of IL-18 in the overall cohort predicted worse physical function at 6-months. In this single center mTBI cohort, obese BMI interacted with higher acute concentrations of NLRP3 inflammasome proteins and worsened short- and long-term clinical outcomes.
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Affiliation(s)
- Shawn R Eagle
- Department of Neurological Surgery, University of Pittsburgh, 3550 Terrace St, Pittsburgh, PA, 15261, USA.
| | - Mahesh K Basantani
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | | | - Natalie Sherry
- Department of Neurological Surgery, University of Pittsburgh, 3550 Terrace St, Pittsburgh, PA, 15261, USA
| | - Peyton McIntyre
- Department of Neurological Surgery, University of Pittsburgh, 3550 Terrace St, Pittsburgh, PA, 15261, USA
| | - Erin E Kershaw
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Ava M Puccio
- Department of Neurological Surgery, University of Pittsburgh, 3550 Terrace St, Pittsburgh, PA, 15261, USA
| | - David O Okonkwo
- Department of Neurological Surgery, University of Pittsburgh, 3550 Terrace St, Pittsburgh, PA, 15261, USA
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Parveen R, Vaish S, Gupta D, Basantani MK. Bioinformatics characterization of patatin-related phospholipase A (pPLA) gene family in agriculturally important crops viz Vigna radiata, Vigna angularis, and Glycine max. Biologia (Bratisl) 2022. [DOI: 10.1007/s11756-022-01026-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bhadouriya SL, Mehrotra S, Basantani MK, Loake GJ, Mehrotra R. Role of Chromatin Architecture in Plant Stress Responses: An Update. Front Plant Sci 2021; 11:603380. [PMID: 33510748 PMCID: PMC7835326 DOI: 10.3389/fpls.2020.603380] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 12/07/2020] [Indexed: 05/08/2023]
Abstract
Sessile plants possess an assembly of signaling pathways that perceive and transmit environmental signals, ultimately resulting in transcriptional reprogramming. Histone is a key feature of chromatin structure. Numerous histone-modifying proteins act under different environmental stress conditions to help modulate gene expression. DNA methylation and histone modification are crucial for genome reprogramming for tissue-specific gene expression and global gene silencing. Different classes of chromatin remodelers including SWI/SNF, ISWI, INO80, and CHD are reported to act upon chromatin in different organisms, under diverse stresses, to convert chromatin from a transcriptionally inactive to a transcriptionally active state. The architecture of chromatin at a given promoter is crucial for determining the transcriptional readout. Further, the connection between somatic memory and chromatin modifications may suggest a mechanistic basis for a stress memory. Studies have suggested that there is a functional connection between changes in nuclear organization and stress conditions. In this review, we discuss the role of chromatin architecture in different stress responses and the current evidence on somatic, intergenerational, and transgenerational stress memory.
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Affiliation(s)
- Sneha Lata Bhadouriya
- Department of Biological Sciences, Birla Institute of Technology and Sciences, Sancoale, India
| | - Sandhya Mehrotra
- Department of Biological Sciences, Birla Institute of Technology and Sciences, Sancoale, India
| | - Mahesh K. Basantani
- Institute of Bioscience and Technology, Shri Ramswaroop Memorial University, Lucknow, India
| | - Gary J. Loake
- School of Biological Sciences, Institute of Molecular Plant Sciences, University of Edinburg, Edinburg, United Kingdom
| | - Rajesh Mehrotra
- Department of Biological Sciences, Birla Institute of Technology and Sciences, Sancoale, India
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Schoiswohl G, Stefanovic-Racic M, Menke MN, Wills RC, Surlow BA, Basantani MK, Sitnick MT, Cai L, Yazbeck CF, Stolz DB, Pulinilkunnil T, O'Doherty RM, Kershaw EE. Impact of Reduced ATGL-Mediated Adipocyte Lipolysis on Obesity-Associated Insulin Resistance and Inflammation in Male Mice. Endocrinology 2015; 156. [PMID: 26196542 PMCID: PMC4588821 DOI: 10.1210/en.2015-1322] [Citation(s) in RCA: 129] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Emerging evidence suggests that impaired regulation of adipocyte lipolysis contributes to the proinflammatory immune cell infiltration of metabolic tissues in obesity, a process that is proposed to contribute to the development and exacerbation of insulin resistance. To test this hypothesis in vivo, we generated mice with adipocyte-specific deletion of adipose triglyceride lipase (ATGL), the rate-limiting enzyme catalyzing triacylglycerol hydrolysis. In contrast to previous models, adiponectin-driven Cre expression was used for targeted ATGL deletion. The resulting adipocyte-specific ATGL knockout (AAKO) mice were then characterized for metabolic and immune phenotypes. Lean and diet-induced obese AAKO mice had reduced adipocyte lipolysis, serum lipids, systemic lipid oxidation, and expression of peroxisome proliferator-activated receptor alpha target genes in adipose tissue (AT) and liver. These changes did not increase overall body weight or fat mass in AAKO mice by 24 weeks of age, in part due to reduced expression of genes involved in lipid uptake, synthesis, and adipogenesis. Systemic glucose and insulin tolerance were improved in AAKO mice, primarily due to enhanced hepatic insulin signaling, which was accompanied by marked reduction in diet-induced hepatic steatosis as well as hepatic immune cell infiltration and activation. In contrast, although adipocyte ATGL deletion reduced AT immune cell infiltration in response to an acute lipolytic stimulus, it was not sufficient to ameliorate, and may even exacerbate, chronic inflammatory changes that occur in AT in response to diet-induced obesity.
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Affiliation(s)
- Gabriele Schoiswohl
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Maja Stefanovic-Racic
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Marie N Menke
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Rachel C Wills
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Beth A Surlow
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Mahesh K Basantani
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Mitch T Sitnick
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Lingzhi Cai
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Cynthia F Yazbeck
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Donna B Stolz
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Thomas Pulinilkunnil
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Robert M O'Doherty
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
| | - Erin E Kershaw
- Division of Endocrinology and Metabolism (G.S., M.S.-R., R.C.W., B.A.S., M.K.B., M.T.S., L.C., C.F.Y., R.M.O., E.E.K.), Department of Medicine, and Department of Cell Biology (D.B.S.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261; Department of Obstetrics, Gynecology, and Reproductive Sciences (M.N.M.), Magee-Womens Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania 15213; and Department of Biochemistry and Molecular Biology (T.P.), Dalhousie Medicine New Brunswick, Dalhousie University, St John, Canada NB E2L 4L5
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5
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Dubé JJ, Sitnick MT, Schoiswohl G, Wills RC, Basantani MK, Cai L, Pulinilkunnil T, Kershaw EE. Adipose triglyceride lipase deletion from adipocytes, but not skeletal myocytes, impairs acute exercise performance in mice. Am J Physiol Endocrinol Metab 2015; 308:E879-90. [PMID: 25783895 PMCID: PMC4436997 DOI: 10.1152/ajpendo.00530.2014] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 03/09/2015] [Indexed: 12/22/2022]
Abstract
Adipose triglyceride lipase (ATGL) is the rate-limiting enzyme mediating triacylglycerol hydrolysis in virtually all cells, including adipocytes and skeletal myocytes, and hence, plays a critical role in mobilizing fatty acids. Global ATGL deficiency promotes skeletal myopathy and exercise intolerance in mice and humans, and yet the tissue-specific contributions to these phenotypes remain unknown. The goal of this study was to determine the relative contribution of ATGL-mediated triacylglycerol hydrolysis in adipocytes vs. skeletal myocytes to acute exercise performance. To achieve this goal, we generated murine models with adipocyte- and skeletal myocyte-specific targeted deletion of ATGL. We then subjected untrained mice to acute peak and submaximal exercise interventions and assessed exercise performance and energy substrate metabolism. Impaired ATGL-mediated lipolysis within adipocytes reduced peak and submaximal exercise performance, reduced peripheral energy substrate availability, shifted energy substrate preference toward carbohydrate oxidation, and decreased HSL Ser(660) phosphorylation and mitochondrial respiration within skeletal muscle. In contrast, impaired ATGL-mediated lipolysis within skeletal myocytes was not sufficient to reduce peak and submaximal exercise performance or peripheral energy substrate availability and instead tended to enhance metabolic flexibility during peak exercise. Furthermore, the expanded intramyocellular triacylglycerol pool in these mice was reduced following exercise in association with preserved HSL phosphorylation, suggesting that HSL may compensate for impaired ATGL action in skeletal muscle during exercise. These data suggest that adipocyte rather than skeletal myocyte ATGL-mediated lipolysis plays a greater role during acute exercise in part because of compensatory mechanisms that maintain lipolysis in muscle, but not adipose tissue, when ATGL is absent.
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Affiliation(s)
- John J Dubé
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; and
| | - Mitch T Sitnick
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; and
| | - Gabriele Schoiswohl
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; and
| | - Rachel C Wills
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; and
| | - Mahesh K Basantani
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; and
| | - Lingzhi Cai
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; and
| | - Thomas Pulinilkunnil
- Department of Biochemistry and Molecular Biology, Dalhousie Medicine New Brunswick, Dalhousie University, Saint John, New Brunswick, Canada
| | - Erin E Kershaw
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; and
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6
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Sitnick MT, Basantani MK, Cai L, Schoiswohl G, Yazbeck CF, Distefano G, Ritov V, DeLany JP, Schreiber R, Stolz DB, Gardner NP, Kienesberger PC, Pulinilkunnil T, Zechner R, Goodpaster BH, Coen P, Kershaw EE. Skeletal muscle triacylglycerol hydrolysis does not influence metabolic complications of obesity. Diabetes 2013; 62:3350-61. [PMID: 23835334 PMCID: PMC3781480 DOI: 10.2337/db13-0500] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Intramyocellular triacylglycerol (IMTG) accumulation is highly associated with insulin resistance and metabolic complications of obesity (lipotoxicity), whereas comparable IMTG accumulation in endurance-trained athletes is associated with insulin sensitivity (the athlete's paradox). Despite these findings, it remains unclear whether changes in IMTG accumulation and metabolism per se influence muscle-specific and systemic metabolic homeostasis and insulin responsiveness. By mediating the rate-limiting step in triacylglycerol hydrolysis, adipose triglyceride lipase (ATGL) has been proposed to influence the storage/production of deleterious as well as essential lipid metabolites. However, the physiological relevance of ATGL-mediated triacylglycerol hydrolysis in skeletal muscle remains unknown. To determine the contribution of IMTG hydrolysis to tissue-specific and systemic metabolic phenotypes in the context of obesity, we generated mice with targeted deletion or transgenic overexpression of ATGL exclusively in skeletal muscle. Despite dramatic changes in IMTG content on both chow and high-fat diets, modulation of ATGL-mediated IMTG hydrolysis did not significantly influence systemic energy, lipid, or glucose homeostasis, nor did it influence insulin responsiveness or mitochondrial function. These data argue against a role for altered IMTG accumulation and lipolysis in muscle insulin resistance and metabolic complications of obesity.
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Affiliation(s)
- Mitch T. Sitnick
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Mahesh K. Basantani
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Lingzhi Cai
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Gabriele Schoiswohl
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Cynthia F. Yazbeck
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Giovanna Distefano
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Vladimir Ritov
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - James P. DeLany
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Renate Schreiber
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Donna B. Stolz
- Department of Cell Biology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Noah P. Gardner
- Novartis Institute of Biomedical Research, Cambridge, Massachusetts
| | - Petra C. Kienesberger
- Department of Biochemistry and Molecular Biology, Dalhousie University, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada
| | - Thomas Pulinilkunnil
- Department of Biochemistry and Molecular Biology, Dalhousie University, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada
| | - Rudolf Zechner
- Department of Cell Biology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Bret H. Goodpaster
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Paul Coen
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Health and Physical Activity, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Erin E. Kershaw
- Division of Endocrinology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
- Corresponding author: Erin E. Kershaw,
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Metukuri MR, Zhang P, Basantani MK, Chin C, Stamateris RE, Alonso LC, Takane KK, Gramignoli R, Strom SC, O’Doherty RM, Stewart AF, Vasavada RC, Garcia-Ocaña A, Scott DK. ChREBP mediates glucose-stimulated pancreatic β-cell proliferation. Diabetes 2012; 61:2004-15. [PMID: 22586588 PMCID: PMC3402328 DOI: 10.2337/db11-0802] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Glucose stimulates rodent and human β-cell replication, but the intracellular signaling mechanisms are poorly understood. Carbohydrate response element-binding protein (ChREBP) is a lipogenic glucose-sensing transcription factor with unknown functions in pancreatic β-cells. We tested the hypothesis that ChREBP is required for glucose-stimulated β-cell proliferation. The relative expression of ChREBP was determined in liver and β-cells using quantitative RT-PCR (qRT-PCR), immunoblotting, and immunohistochemistry. Loss- and gain-of-function studies were performed using small interfering RNA and genetic deletion of ChREBP and adenoviral overexpression of ChREBP in rodent and human β-cells. Proliferation was measured by 5-bromo-2'-deoxyuridine incorporation, [(3)H]thymidine incorporation, and fluorescence-activated cell sorter analysis. In addition, the expression of cell cycle regulatory genes was measured by qRT-PCR and immunoblotting. ChREBP expression was comparable with liver in mouse pancreata and in rat and human islets. Depletion of ChREBP decreased glucose-stimulated proliferation in β-cells isolated from ChREBP(-/-) mice, in INS-1-derived 832/13 cells, and in primary rat and human β-cells. Furthermore, depletion of ChREBP decreased the glucose-stimulated expression of cell cycle accelerators. Overexpression of ChREBP amplified glucose-stimulated proliferation in rat and human β-cells, with concomitant increases in cyclin gene expression. In conclusion, ChREBP mediates glucose-stimulated proliferation in pancreatic β-cells.
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Affiliation(s)
- Mallikarjuna R. Metukuri
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
- Laboratory of Signal Transduction, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina
| | - Pili Zhang
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Mahesh K. Basantani
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Connie Chin
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Rachel E. Stamateris
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Laura C. Alonso
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Karen K. Takane
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Roberto Gramignoli
- Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Stephen C. Strom
- Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Robert M. O’Doherty
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Andrew F. Stewart
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Rupangi C. Vasavada
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Adolfo Garcia-Ocaña
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Donald K. Scott
- Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh, Pittsburgh, Pennsylvania
- Corresponding author: Donald K. Scott,
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Basantani MK, Sitnick MT, Cai L, Brenner DS, Gardner NP, Li JZ, Schoiswohl G, Yang K, Kumari M, Gross RW, Zechner R, Kershaw EE. Pnpla3/Adiponutrin deficiency in mice does not contribute to fatty liver disease or metabolic syndrome. J Lipid Res 2011; 52:318-29. [PMID: 21068004 PMCID: PMC3023552 DOI: 10.1194/jlr.m011205] [Citation(s) in RCA: 175] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2010] [Revised: 11/02/2010] [Indexed: 12/11/2022] Open
Abstract
PNPLA3 (adiponutrin, calcium-independent phospholipase A(2) epsilon [iPLA(2)ε]) is an adipose-enriched, nutritionally regulated protein that belongs to the patatin-like phospholipase domain containing (PNPLA) family of lipid metabolizing proteins. Genetic variations in the human PNPLA3 gene (i.e., the rs738409 I148M allele) has been strongly and repeatedly associated with fatty liver disease. Although human PNPLA3 has triacylglycerol (TAG) hydrolase and transacylase activities in vitro, its in vivo function and physiological relevance remain controversial. The objective of this study was to determine the metabolic consequences of global targeted deletion of the Pnpla3 gene in mice. We found that Pnpla3 mRNA expression is altered in adipose tissue and liver in response to acute and chronic nutritional challenges. However, global targeted deletion of the Pnpla3 gene in mice did not affect TAG hydrolysis, nor did it influence energy/glucose/lipid homoeostasis or hepatic steatosis/injury. Experimental interventions designed to increase Pnpla3 expression (refeeding, high-sucrose diet, diet-induced obesity, and liver X receptor agonism) likewise failed to reveal differences in the above-mentioned metabolic phenotypes. Expression of the Pnpla3 paralog, Pnpla5, was increased in adipose tissue but not in liver of Pnpla3-deficient mice, but compensatory regulation of genes involved in TAG metabolism was not identified. Together these data argue against a role for Pnpla3 loss-of-function in fatty liver disease or metabolic syndrome in mice.
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Affiliation(s)
- Mahesh K. Basantani
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA
| | - Mitch T. Sitnick
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA
| | - Lingzhi Cai
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA
| | - Daniel S. Brenner
- Division of Endocrinology and Metabolism, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA
| | - Noah P. Gardner
- Division of Endocrinology and Metabolism, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA
| | - John Zhong Li
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX
| | | | - Kui Yang
- Division of Bioorganic Chemistry and Molecular Pharmacology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - Manju Kumari
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Richard W. Gross
- Division of Bioorganic Chemistry and Molecular Pharmacology, Department of Medicine, Washington University School of Medicine, St. Louis, MO
| | - Rudolf Zechner
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Erin E. Kershaw
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA
- Division of Endocrinology and Metabolism, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA
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Basantani MK, Sitnick MT, Cai L, Brenner DS, Gardner NP, Li JZ, Schoiswohl G, Yang K, Kumari M, Gross RW, Zechner R, Kershaw EE. Pnpla3/Adiponutrin deficiency in mice does not contribute to fatty liver disease or metabolic syndrome. J Lipid Res 2010. [PMID: 21068004 DOI: 10.1194/jlr.m01120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
PNPLA3 (adiponutrin, calcium-independent phospholipase A(2) epsilon [iPLA(2)ε]) is an adipose-enriched, nutritionally regulated protein that belongs to the patatin-like phospholipase domain containing (PNPLA) family of lipid metabolizing proteins. Genetic variations in the human PNPLA3 gene (i.e., the rs738409 I148M allele) has been strongly and repeatedly associated with fatty liver disease. Although human PNPLA3 has triacylglycerol (TAG) hydrolase and transacylase activities in vitro, its in vivo function and physiological relevance remain controversial. The objective of this study was to determine the metabolic consequences of global targeted deletion of the Pnpla3 gene in mice. We found that Pnpla3 mRNA expression is altered in adipose tissue and liver in response to acute and chronic nutritional challenges. However, global targeted deletion of the Pnpla3 gene in mice did not affect TAG hydrolysis, nor did it influence energy/glucose/lipid homoeostasis or hepatic steatosis/injury. Experimental interventions designed to increase Pnpla3 expression (refeeding, high-sucrose diet, diet-induced obesity, and liver X receptor agonism) likewise failed to reveal differences in the above-mentioned metabolic phenotypes. Expression of the Pnpla3 paralog, Pnpla5, was increased in adipose tissue but not in liver of Pnpla3-deficient mice, but compensatory regulation of genes involved in TAG metabolism was not identified. Together these data argue against a role for Pnpla3 loss-of-function in fatty liver disease or metabolic syndrome in mice.
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Affiliation(s)
- Mahesh K Basantani
- Division of Endocrinology and Metabolism, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
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