Innervation of thermogenic adipose tissue via a calsyntenin 3β–S100b axis

Xing Zeng, Mengchen Ye, Jon M. Resch, Mark P. Jedrychowski, Bo Hu, Bradford B. Lowell, David D. Ginty and Bruce M. Spiegelman ()
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Xing Zeng: Dana Farber Cancer Institute
Mengchen Ye: Howard Hughes Medical Institute, Harvard Medical School
Jon M. Resch: Harvard Medical School
Mark P. Jedrychowski: Dana Farber Cancer Institute
Bo Hu: Dana Farber Cancer Institute
Bradford B. Lowell: Harvard Medical School
David D. Ginty: Howard Hughes Medical Institute, Harvard Medical School
Bruce M. Spiegelman: Dana Farber Cancer Institute

Nature, 2019, vol. 569, issue 7755, 229-235

Abstract: Abstract The sympathetic nervous system drives brown and beige adipocyte thermogenesis through the release of noradrenaline from local axons. However, the molecular basis of higher levels of sympathetic innervation of thermogenic fat, compared to white fat, has remained unknown. Here we show that thermogenic adipocytes express a previously unknown, mammal-specific protein of the endoplasmic reticulum that we term calsyntenin 3β. Genetic loss or gain of expression of calsyntenin 3β in adipocytes reduces or enhances functional sympathetic innervation, respectively, in adipose tissue. Ablation of calsyntenin 3β predisposes mice on a high-fat diet to obesity. Mechanistically, calsyntenin 3β promotes endoplasmic-reticulum localization and secretion of S100b—a protein that lacks a signal peptide—from brown adipocytes. S100b stimulates neurite outgrowth from sympathetic neurons in vitro. A deficiency of S100b phenocopies deficiency of calsyntenin 3β, and forced expression of S100b in brown adipocytes rescues the defective sympathetic innervation that is caused by ablation of calsyntenin 3β. Our data reveal a mammal-specific mechanism of communication between thermogenic adipocytes and sympathetic neurons.

Date: 2019
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DOI: 10.1038/s41586-019-1156-9

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