The Effect of Hypoxia Mimetic Cobalt Chloride on the Expression of EC-SOD in 3T3-L1 Adipocytes

Overview

Journal Redox Rep

Specialties Biochemistry
Biology
Endocrinology

Date 2010 Jul 3

PMID 20594416

Citations 13

Authors

Tetsuro Kamiya

Hirokazu Hara

Naoki Inagaki

Tetsuo Adachi

Affiliations

Soon will be listed here.

Abstract

It is well known that adipose tissue is not only a passive reservoir for energy storage but also produces and secretes a variety of bioactive molecules called adipocytokines, including adiponectin and tumor necrosis factor-alpha (TNF-alpha). Recently, it has been reported that adipose tissue can suffer a chronic hypoxic condition during hypertrophy of adipocytes, and this condition leads to the dysregulation of adipocytokines. Further, hypoxic adipocytes are in an increased oxidative stress. Extracellular-superoxide dismutase (EC-SOD) is an anti-inflammatory enzyme that protects cells from reactive oxygen species (ROS) by scavenging superoxide anion. Previous reports showed that plasma EC-SOD levels in type 2 diabetes patients were significantly and inversely related to the body mass index, homeostasis model assessment-insulin resistance index; however, the mechanisms of EC-SOD and adiponectin reductions during hypoxia remain poorly understood. Here, we demonstrate that cobalt chloride (CoCl(2)), a hypoxia mimetic, decreases EC-SOD and adiponectin in 3T3-L1 adipocytes by intracellular ROS-independent, but TNF-alpha and c-jun N-terminal kinase (JNK)-dependent mechanisms. From these results, it is possible that TNF-alpha is a key regulator of the reduction of EC-SOD and adiponectin in CoCl(2)-treated 3T3-L1 adipocytes, and we speculated that the reduction of EC-SOD and adiponectin would lead to and/or promote metabolic disorders.

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