Dietary curcumin enhances insulin clearance in diet-induced obese mice via regulation of hepatic PI3K-AKT axis and IDE, and preservation of islet integrity.
Level 5 - mechanism / opinion, no new human data
Preclinical animal model and in vitro cell culture study (no human clinical data)
PubMed 31372175 · doi:10.1186/s12986-019-0377-0
What was done
Male C57BL/6J mice were divided into three groups (n = 16 per group) and fed a control diet, a high-fat/high-sugar (HFS) diet, or an HFS diet supplemented with 0.4% (w/w) curcumin for 16 weeks. The researchers evaluated body weight, hepatic fat accumulation, fasting insulin, hepatic insulin-degrading enzyme (IDE), and hepatic PI3K-AKT signaling components. They also measured thioredoxin-interacting protein (TXNIP) expression in mouse and human islets cultured under HFS-mimicking conditions.
What was found
The abstract reports directional effects without exact numerical values or confidence intervals. Mice fed HFS plus curcumin had lower body weight, reduced liver fat, and lower fasting insulin levels compared to HFS alone, alongside upregulation of hepatic IDE. Expression of PI3K subunits (p110alpha, p110beta, p101) and phosphorylated AKT was restored in liver tissue. Curcumin-fed mice also showed smaller islets of Langerhans and increased glucagon content. In cultured mouse and human islets, curcumin mitigated HFS-induced elevations in TXNIP expression.
Why it matters
The study outlines a potential mechanism whereby curcumin enhances hepatic insulin clearance and preserves pancreatic islet morphology in the context of diet-induced obesity.
Limits
Findings are limited to male mice and cultured islets; clinical efficacy, safety, and oral bioavailability in humans cannot be inferred. The abstract omits all numerical point estimates, variance, and exact p-values. Female animals were not tested.
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