Effect of salsalate on insulin action, secretion, and clearance in nondiabetic, insulin-resistant individuals: a randomized, placebo-controlled study

Sun H Kim, Alice Liu, Danit Ariel, Fahim Abbasi, Cindy Lamendola, Kaylene Grove, Vanessa Tomasso, Hector Ochoa, Gerald Reaven, Sun H Kim, Alice Liu, Danit Ariel, Fahim Abbasi, Cindy Lamendola, Kaylene Grove, Vanessa Tomasso, Hector Ochoa, Gerald Reaven

Abstract

Objective: Salsalate treatment has been shown to improve glucose homeostasis, but the mechanism remains unclear. The aim of this study was to evaluate the effect of salsalate treatment on insulin action, secretion, and clearance rate in nondiabetic individuals with insulin resistance.

Research design and methods: This was a randomized (2:1), single-blind, placebo-controlled study of salsalate (3.5 g daily for 4 weeks) in nondiabetic individuals with insulin resistance. All individuals had measurement of glucose tolerance (75-g oral glucose tolerance test), steady-state plasma glucose (SSPG; insulin suppression test), and insulin secretion and clearance rate (graded-glucose infusion test) before and after treatment.

Results: Forty-one individuals were randomized to salsalate (n = 27) and placebo (n = 14). One individual from each group discontinued the study. Salsalate improved fasting (% mean change -7% [95% CI -10 to -14] vs. 1% [-3 to 5], P = 0.005) but not postprandial glucose concentration compared with placebo. Salsalate also lowered fasting triglyceride concentration (-25% [-34 to -15] vs. -6% [-26 to 14], P = 0.04). Salsalate had no effect on SSPG concentration or insulin secretion rate but significantly decreased insulin clearance rate compared with placebo (-23% [-30 to -16] vs. 3% [-10 to 15], P < 0.001). Salsalate was well tolerated, but four individuals needed a dose reduction due to symptoms.

Conclusions: Salsalate treatment in nondiabetic, insulin-resistant individuals improved fasting, but not postprandial, glucose and triglyceride concentration. These improvements were associated with a decrease in insulin clearance rate without change in insulin action or insulin secretion.

Trial registration: ClinicalTrials.gov NCT02007577.

© 2014 by the American Diabetes Association.

Figures

Figure 1
Figure 1
Changes during the OGTT in glucose (A and B) and insulin (C and D) profile following salsalate (A and C) and placebo (B and D) treatment. Curves at baseline (closed circles) and 4 weeks (open circles) after treatment are shown. Glucose AUC was significantly lower after placebo (P = 0.004), and insulin AUC was significantly higher after salsalate (P = 0.001). P values represent within-group difference in AUC.
Figure 2
Figure 2
Change in MCR-I during the IST (A) and GGIT (B). Salsalate significantly decreased MCR-I during both the IST and GGIT.

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Source: PubMed

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