Format

Send to

Choose Destination
Am J Physiol Endocrinol Metab. 2017 Jun 1;312(6):E471-E481. doi: 10.1152/ajpendo.00328.2016. Epub 2017 Feb 7.

S100B impairs glycolysis via enhanced poly(ADP-ribosyl)ation of glyceraldehyde-3-phosphate dehydrogenase in rodent muscle cells.

Author information

1
Department of Endocrinology and Diabetes, Nagoya University Graduate School of Medicine, Nagoya, Japan.
2
Department of Endocrinology and Diabetes, Nagoya University Graduate School of Medicine, Nagoya, Japan; yhama@med.nagoya-u.ac.jp.
3
Department of Diabetology and Nephrology, Ogaki Municipal Hospital, Ogaki City, Gifu Prefecture, Japan.
4
Department of Oral and Maxillofacial Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan; and.
5
Division of Diabetes, Department of Internal Medicine, Aichi Medical University School of Medicine, Nagakute, Japan.

Abstract

S100 calcium-binding protein B (S100B), a multifunctional macromolecule mainly expressed in nerve tissues and adipocytes, has been suggested to contribute to the pathogenesis of obesity. To clarify the role of S100B in insulin action and glucose metabolism in peripheral tissues, we investigated the effect of S100B on glycolysis in myoblast and myotube cells. Rat myoblast L6 cells were treated with recombinant mouse S100B to examine glucose consumption, lactate production, glycogen accumulation, glycolytic metabolites and enzyme activity, insulin signaling, and poly(ADP-ribosyl)ation of glyceraldehyde-3-phosphate dehydrogenase (GAPDH). Glycolytic metabolites were investigated by enzyme assays or metabolome analysis, and insulin signaling was assessed by Western blot analysis. Enzyme activity and poly(ADP-ribosyl)ation of GAPDH was evaluated by an enzyme assay and immunoprecipitation followed by dot blot with an anti-poly(ADP-ribose) antibody, respectively. S100B significantly decreased glucose consumption, glucose analog uptake, and lactate production in L6 cells, in either the presence or absence of insulin. In contrast, S100B had no effect on glycogen accumulation and insulin signaling. Metabolome analysis revealed that S100B increased the concentration of glycolytic intermediates upstream of GAPDH. S100B impaired GAPDH activity and increased poly(ADP-ribosyl)ated GAPDH proteins. The effects of S100B on glucose metabolism were mostly canceled by a poly(ADP-ribose) polymerase inhibitor. Similar results were obtained in C2C12 myotube cells. We conclude that S100B as a humoral factor may impair glycolysis in muscle cells independent of insulin action, and the effect may be attributed to the inhibition of GAPDH activity from enhanced poly(ADP-ribosyl)ation of the enzyme.

KEYWORDS:

S100 calcium-binding protein B; glucose; myoblast

PMID:
28174179
DOI:
10.1152/ajpendo.00328.2016
[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for Atypon
Loading ...
Support Center