Hepatic STAMP2 alleviates high fat diet-induced hepatic steatosis and insulin resistance.

Journal of hepatology (2015-02-04)
Hye Y Kim, So Y Park, Mi H Lee, Jee H Rho, Yoo J Oh, Hye U Jung, Seung H Yoo, Na Y Jeong, Hye J Lee, SungHwan Suh, Su Y Seo, JaeHun Cheong, Jin S Jeong, Young H Yoo
RESUMEN

Most studies on the role of STAMP2 in metabolism have used adipose tissue. Little knowledge exists concerning the role of STAMP2 in the liver, which is a metabolically central target. We hypothesized that STAMP2 is involved in non-alcoholic fatty liver disease (NAFLD) pathogenesis. We examined our hypothesis using human NAFLD patient pathology samples and a high-fat diet (HFD)-induced NAFLD mouse model. The molecular mechanism underlying hepatic STAMP2-mediated lipid imbalance was explored using an oleic acid (OA)-induced NAFLD in vitro model. Noticeably, the expression level of STAMP2 protein was reduced in the livers obtained from NAFLD patients and HFD-induced NAFLD mice. In vivo knockdown of hepatic STAMP2 by siRNA accelerated hepatic steatosis and insulin resistance in mice fed a HFD. Conversely, the delivery of adenoviral STAMP2 (Ad-STAMP2) improved hepatic steatosis in HFD-induced NAFLD mice. The expression of lipogenic or adipogenic factors was increased in both in vitro and in vivo NAFLD models but was reversed by Ad-STAMP2. Adenoviral overexpression of STAMP2 improved insulin resistance in the HFD-induced NAFLD mice. In vivo and in vitro assays demonstrated that STAMP2 modulates insulin sensitivity and glucose metabolism and that STAMP2 counteracts OA-induced insulin resistance by modulating insulin receptor substrate-1 stability. The present study revealed that hepatic STAMP2 plays a pivotal role in preventing HFD-induced NAFLD and that STAMP2 overexpression improves hepatic steatosis and insulin resistance in NAFLD. Our findings indicate that STAMP2 may represent a suitable target for interventions targeting NAFLD.

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Sigma-Aldrich
Oleic acid, ≥99% (GC)
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Cycloheximide, from microbial, ≥94% (TLC)
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Palmitic acid, ≥99%
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Oleic acid, technical grade, 90%
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Cycloheximide solution, Ready-Made Solution, microbial, 100 mg/mL in DMSO, 0.2 μm filtered
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Cycloheximide, ≥95% (HPLC)
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Stearic acid, Grade I, ≥98.5% (capillary GC)
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Stearic acid, reagent grade, 95%
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Oleic acid, suitable for cell culture, BioReagent
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Stearic acid, ≥95%, FCC, FG
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Palmitic acid, BioXtra, ≥99%
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Oleic acid, natural, FCC
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Cycloheximide, Biotechnology Performance Certified
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Palmitic acid, ≥95%, FCC, FG
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Palmitic acid, natural, 98%, FG
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Palmitic acid, ≥98% palmitic acid basis (GC)