Regulation of circulating CTRP-2/CTRP-9 and GDF-8/GDF-15 by intralipids and insulin in healthy control and polycystic ovary syndrome women following chronic exercise training

Jerobin, Jayakumar; Ramanjaneya, Manjunath; Bettahi, Ilham; Parammal, Raihanath; Siveen, Kodappully Sivaraman; Alkasem, Meis; Aye, Myint; Sathyapalan, Thozhukat; Skarulis, Monica; Atkin, Stephen L.; Abou-Samra, Abdul Badi

Abstract

Background: Polycystic ovary syndrome (PCOS) is associated with obesity, diabetes, and insulin resistance. The circulating C1Q/TNF-related proteins (CTRP-2, CTRP-9) and growth differentiation factors (GDF-8, GDF-15) contribute to glucose and lipid homeostasis. The effects of intralipids and insulin infusion on CTRP-2, CTRP-9, GDF-8 and GDF-15 in PCOS and control subjects before and after chronic exercise training were examined. Methods: Ten PCOS and nine healthy subjects were studied at baseline status and after moderate-intensity chronic exercise training (1 h exercise, 3 times per week, 8 weeks). All participants were infused with 1.5 mL/min of saline or intralipids (20%) for 5 h, and during the last 2 h of saline or intralipids infusion hyperinsulinemic-euglycemic clamp (HIEC) was performed. CTRP-2, CTRP-9, GDF-8 and GDF-15 levels were measured at 0, 3 and 5 h. Results: Intralipids dramatically increased CTRP-2 levels in PCOS (P = 0.02) and control (P = 0.004) subjects, which was not affected by insulin infusion or by exercise. Intralipids alone had no effects on CTRP-9, GDF-8, or GDF-15. Insulin increased the levels of GDF-15 in control subjects (P = 0.05) during the saline study and in PCOS subjects (P = 0.04) during the intralipid infusion. Insulin suppressed CTRP9 levels during the intralipid study in both PCOS (P = 0.04) and control (P = 0.01) subjects. Exercise significantly reduced fasting GDF-8 levels in PCOS (P = 0.03) and control (P = 0.04) subjects; however, intralipids infusion after chronic exercise training increased GDF-8 levels in both PCOS (P = 0.003) and control (P = 0.05) subjects and insulin infusion during intralipid infusion reduced the rise of GDF-8 levels. Conclusion: This study showed that exogenous lipids modulate CTRP-2, which might have a physiological role in lipid metabolism. Since chronic exercise training reduced fasting GDF-8 levels; GDF-8 might have a role in humoral adaptation to exercise. GDF-15 and CTRP-9 levels are responsive to insulin, and thus they may play a role in insulin responses.

Citation

Jerobin, J., Ramanjaneya, M., Bettahi, I., Parammal, R., Siveen, K. S., Alkasem, M., Aye, M., Sathyapalan, T., Skarulis, M., Atkin, S. L., & Abou-Samra, A. B. (2021). Regulation of circulating CTRP-2/CTRP-9 and GDF-8/GDF-15 by intralipids and insulin in healthy control and polycystic ovary syndrome women following chronic exercise training. Lipids in Health and Disease, 20(1), Article 34. https://doi.org/10.1186/s12944-021-01463-3

• Journal Article Type: Article
• Acceptance Date: Apr 6, 2021
• Online Publication Date: Apr 19, 2021
• Publication Date: Dec 1, 2021
• Deposit Date: May 15, 2021
• Publicly Available Date: May 18, 2021
• Journal: Lipids in Health and Disease
• Print ISSN: 1476-511X
• Electronic ISSN: 1476-511X
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 20
• Issue: 1
• Article Number: 34
• DOI: https://doi.org/10.1186/s12944-021-01463-3
• Keywords: C1Q/TNF related proteins; Growth differentiation factors; Lipid; Insulin; Insulin resistance; Euglycemic clamp; Exercise and polycystic ovary syndrome
• Public URL: https://hull-repository.worktribe.com/output/3761834