Myonectin deletion promotes adipose fat storage and reduces liver steatosis

Hannah C. Little, Susana Rodriguez, Xia Lei, Stefanie Y. Tan, Ashley N. Stewart, Ageline Sahagun, Dylan C. Sarver, Guang William Wong

Research output: Contribution to journalArticle

Abstract

We recently described myonectin (also known as erythroferrone) as a novel skeletal muscle-derived myokine with metabolic functions. Here, we use a genetic mouse model to determine myonectin's requirement for metabolic homeostasis. Female myonectin-deficient mice had larger gonadal fat pads and developed mild insulin resistance when fed a high-fat diet (HFD) and had reduced food intake during refeeding after an unfed period but were otherwise indistinguishable from wild-type littermates. Male mice lacking myonectin, however, had reduced physical activity when fed ad libitum and in the postprandial state but not during the unfed period. When stressed with an HFD, myonectin-knockout male mice had significantly elevated VLDL-triglyceride (TG) and strikingly impaired lipid clearance from circulation following an oral lipid load. Fat distribution between adipose and liver was also altered in myonectin-deficient male mice fed an HFD. Greater fat storage resulted in significantly enlarged adipocytes and was associated with increased postprandial lipoprotein lipase activity in adipose tissue. Parallel to this was a striking reduction in liver steatosis due to significantly reduced TG accumulation. Liver metabolite profiling revealed additional significant changes in bile acids and 1-carbon metabolism pathways. Combined, our data affirm the physiologic importance of myonectin in regulating local and systemic lipid metabolism.-Little, H. C., Rodriguez, S., Lei, X., Tan, S. Y., Stewart, A. N., Sahagun, A., Sarver, D. C., Wong, G. W. Myonectin deletion promotes adipose fat storage and reduces liver steatosis.

Original languageEnglish (US)
Pages (from-to)8666-8687
Number of pages22
JournalFASEB journal : official publication of the Federation of American Societies for Experimental Biology
Volume33
Issue number7
DOIs
Publication statusPublished - Jul 1 2019

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Keywords

  • carbohydrate metabolism
  • diabetes
  • lipid metabolism
  • myokine
  • obesity

ASJC Scopus subject areas

  • Biotechnology
  • Biochemistry
  • Molecular Biology
  • Genetics

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