Exenatide exerts a potent antiinflammatory effect.
Level 2 - randomized trial
Individual randomized controlled trial
PubMed 22013105 · doi:10.1210/jc.2011-1508
What was done
Twenty-four patients (mean BMI ~39–40 kg/m², baseline HbA1c ~8.5–8.6%) were prospectively randomized to subcutaneous injections of exenatide 10 μg twice daily (n = 12) or placebo twice daily (n = 12) for 12 weeks. Fasting blood samples were obtained at baseline, 3, 6, and 12 weeks. Blood samples were also collected for up to 6 hours after a single dose of exenatide (5 μg) or placebo to evaluate acute responses.
What was found
Over 12 weeks, exenatide reduced fasting blood glucose from 139 ± 17 to 110 ± 9 mg/dl, HbA1c from 8.6 ± 0.4 to 7.4 ± 0.5% (P < 0.05), and free fatty acids by 21 ± 5% (P < 0.05) without weight loss. In mononuclear cells, exenatide significantly suppressed reactive oxygen species generation (-22 ± 9%), NF-κB binding (-26 ± 7%), and mRNA expression of TNFα (-31 ± 12%), IL-1β (-22 ± 10%), JNK-1 (-20 ± 11%), TLR-2 (-22 ± 9%), TLR-4 (-16 ± 7%), and SOCS-3 (-31 ± 10%) (all P < 0.05). Plasma concentrations of MCP-1 (-15 ± 7%), MMP-9 (-20 ± 11%), serum amyloid A (-16 ± 7%), and IL-6 (-22 ± 12%) were also significantly suppressed (P < 0.05). A single injection of exenatide produced acute reductions in free fatty acids (-20 ± 7%), reactive oxygen species generation (-19 ± 7%), NF-κB binding (-39 ± 11%), and related inflammatory transcripts within 6 hours (all P < 0.05).
Why it matters
This study demonstrates that exenatide exerts rapid and sustained anti-inflammatory and antioxidant effects at cellular and molecular levels independently of body weight changes.
Limits
The trial had a very small sample size (12 participants per group) and evaluated surrogate molecular and circulating inflammatory markers rather than hard clinical cardiovascular endpoints. The abstract reports within-group changes and does not provide detailed between-group comparative statistics.
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