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Cantwell MT, Farrar JS, Lownik JC, Meier JA, Hyun M, Raje V, Waters MR, Celi FS, Conrad DH, Harris TE, Larner AC. STAT3 suppresses Wnt/β-catenin signaling during the induction phase of primary Myf5+ brown adipogenesis. Cytokine 2018; 111:434-444. [PMID: 29934048 PMCID: PMC6289720 DOI: 10.1016/j.cyto.2018.05.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 05/24/2018] [Accepted: 05/27/2018] [Indexed: 12/28/2022]
Abstract
Thermogenic fat is a promising target for new therapies in diabetes and obesity. Understanding how thermogenic fat develops is important to develop rational strategies to treat obesity. Previously, we have shown that Tyk2 and STAT3, part of the JAK-STAT pathway, are necessary for proper development of classical brown fat. Using primary preadipocytes isolated from newborn mice we demonstrate that STAT3 is required for differentiation and robust expression of Uncoupling Protein 1 (UCP1). We also confirm that STAT3 is necessary during the early induction stage of differentiation and is dispensable during the later terminal differentiation stage. The inability of STAT3-/- preadipocytes to differentiate can be rescued using Wnt ligand secretion inhibitors when applied during the induction stage. Through chemical inhibition and RNAi, we show that it is the canonical β-catenin pathway that is responsible for the block in differentiation; inhibition or knockdown of β-catenin can fully rescue adipogenesis and UCP1 expression in the STAT3-/- adipocytes. During the induction stage, Wnts 1, 3a, and 10b have increased expression in the STAT3-/- adipocytes, potentially explaining the increased levels and activity of β-catenin. Our results for the first time point towards an interaction between the JAK/STAT pathway and the Wnt/β-catenin pathway during the early stages of in-vitro adipogenesis.
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Affiliation(s)
- Marc T Cantwell
- Center for Clinical and Translational Research, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Jared S Farrar
- Center for Clinical and Translational Research, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Joseph C Lownik
- Center for Clinical and Translational Research, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Jeremy A Meier
- Center for Clinical and Translational Research, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Moonjung Hyun
- Department of Biochemistry and Molecular Biology, and Massey Cancer Center, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Vidisha Raje
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Michael R Waters
- Department of Biochemistry and Molecular Biology, and Massey Cancer Center, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Francesco S Celi
- Division of Endocrinology, Diabetes, and Metabolism, Department of Internal Medicine, Virginia Commonwealth University School of Medicine, Richmond, VA 23298, USA
| | - Daniel H Conrad
- Department of Microbiology and Immunology, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Thurl E Harris
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
| | - Andrew C Larner
- Department of Biochemistry and Molecular Biology, and Massey Cancer Center, Virginia Commonwealth University, Richmond, VA 23298, USA.
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