1. Academic Validation
  2. Rapid responses of adipocytes to iron overload increase serum TG level by decreasing adiponectin

Rapid responses of adipocytes to iron overload increase serum TG level by decreasing adiponectin

  • J Cell Physiol. 2021 Nov;236(11):7544-7553. doi: 10.1002/jcp.30391.
Yuxiao Tang 1 Dongyao Wang 2 3 Hongwei Zhang 1 4 Yinyin Zhang 1 Jie Wang 1 Ruirui Qi 1 Jianxin Yang 1 Hui Shen 1 Yan Xu 5 Min Li 1 5
Affiliations

Affiliations

  • 1 Department of Nutrition, Second Military Medical University, Shanghai, China.
  • 2 School of Pharmacy, Second Military Medical University, Shanghai, China.
  • 3 Faculty of Pharmacy, Shanghai University, Shanghai, China.
  • 4 Department of Clinical Nutrition, Zhumadian Second People's Hospital, Henan, China.
  • 5 Institute of International Medical Science and Technology, Sanda University, Shanghai, China.
Abstract

Iron overload is tightly connected with metabolic disorders. Excess iron in the adipose and its roles in dyslipidemia are of interest to be identified. In acute iron overload mice receiving intraperitoneal injection of 100 mg/kg/day dextran-iron for 5 days, the epididymis adipose showed a remarkable increase in iron. Serum triglyceride and low-density lipoprotein Cholesterol (LDL-C) levels were increased and high-density lipoprotein Cholesterol (HDL-C) level was decreased, while serum Alkaline Phosphatase, aspartate aminotransferase, glucose, and Insulin were not affected. The serum-cytokine-microarray showed that adipocytokines, including Adiponectin, Leptin, and resistin were significantly decreased. Other serum cytokines, including pro-insulin cytokines, inflammatory cytokines, chemokines, and growth factors were not changed, except that ghrelin and chemokine RANTES were increased. Iron overload decreased expressions of Adiponectin and Leptin both in vivo and in vitro. Intraperitoneal injection of recombinant Leptin at 1 μg/g in acute iron overload mice had no significant effects on serum levels of TC, TG, HDL-C, and LDL-C, while intraperitoneal injection of recombinant Adiponectin at 3 μg/g partially restored serum TG level through improving activities of lipoprotein Lipase and hepatic Lipase, but abnormal serum LDL-C and HDL-C were not redressed, suggesting other mechanisms also existed. In conclusion, the adipose responds to iron overload at an early stage to interfere with lipid metabolism by secreting adipocytokines, which may further affect glucose metabolism, inflammation, and other iron overload-induced effects on the body.

Keywords

adiponectin; adipose tissue; dyslipidemia; hepatic lipase; iron overload; lipoprotein lipase.

Figures
Products