Obesity-Linked PPAR gamma S273 Phosphorylation Promotes Insulin Resistance through Growth Differentiation Factor 3

Author(s):Show less -

Hall, Jessica A. ^{[1, 2]} ; Ramachandran, Deepti ^{[1, 2]} ; Roh, Hyun C. ^{[1, 2]} ; DiSpirito, Joanna R. ^[3] ; Belchior, Thiago ^{[1, 2]} ; Zushin, Peter-James H. ^{[1, 2]} ; Palmer, Colin ^{[1, 2]} ; Hong, Shangyu ^{[1, 2]} ; Mina, I, Amir ; Liu, Bingyang ^{[4, 5]} ; Deng, Zhaoming ^{[4, 5]} ; Aryal, Pratik ^{[4, 5]} ; Jacobs, Christopher ^{[4, 5]} ; Tenen, Danielle ^{[4, 5]} ; Brown, Chester W. ^[6] ; Charles, Julia F. ^[7] ; Shulman, I, Gerald ; Kahn, Barbara B. ^{[4, 5]} ; Tsai, Linus T. Y. ^{[4, 5]} ; Rosen, Evan D. ^{[4, 5]} ; Spiegelman, Bruce M. ^{[8, 9]} ; Banks, Alexander S. ^{[4, 5]}

Affiliation

^[1] Beth Israel Deaconess Med Ctr, Div Endocrinol Diabet & Metab, Boston, MA 02215 - USA

^[2] Harvard Med Sch, Boston, MA 02215 - USA

^[3] Harvard Med Sch, Dept Immunol, Boston, MA 02115 - USA

^[4] Mina, Amir, I, Beth Israel Deaconess Med Ctr, Div Endocrinol Diabet & Metab, Boston, MA 02215 - USA

^[5] Mina, Amir, I, Harvard Med Sch, Boston, MA 02215 - USA

^[6] Univ Tennessee, Dept Pediat, Hlth Sci Ctr, Memphis, TN 38103 - USA

^[7] Harvard Med Sch, Brigham & Womens Hosp, Dept Orthoped, Boston, MA 02115 - USA

^[8] Harvard Med Sch, Dana Farber Canc Inst, Dept Canc Biol, Boston, MA 02215 - USA

^[9] Harvard Med Sch, Dept Cell Biol, Boston, MA 02215 - USA

• Document type: Journal article
• Source: Cell Metabolism; v. 32, n. 4, p. 665+, OCT 6 2020.
• Web of Science Citations: 0

Abstract

The thiazolidinediones (TZDs) are ligands of PPAR gamma that improve insulin sensitivity, but their use is limited by significant side effects. Recently, we demonstrated a mechanism wherein TZDs improve insulin sensitivity distinct from receptor agonism and adipogenesis: reversal of obesity-linked phosphorylation of PPAR gamma at serine 273. However, the role of this modification hasn't been tested genetically. Here we demonstrate that mice encoding an allele of PPAR gamma that cannot be phosphorylated at S273 are protected from insulin resistance, without exhibiting differences in body weight or TZD-associated side effects. Indeed, hyperinsulinemic-euglycemic clamp experiments confirm insulin sensitivity. RNA-seq in these mice reveals reduced expression of Gdf3, a BMP family member. Ectopic expression of Gdf3 is sufficient to induce insulin resistance in lean, healthy mice. We find Gdf3 inhibits BMP signaling and insulin signaling in vitro. Together, these results highlight the diabetogenic role of PPAR gamma S273 phosphorylation and focus attention on a putative target, Gdf3. (AU)

• FAPESP's process: 17/25881-0 - ERK Kinase regulation of insulin signaling and inflammation: honing the antidiabetic effects of PPARgamma activation
• Grantee: Thiago Belchior de Oliveira
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor