S100A9 extends lifespan in insulin deficiency

Nature Communications
Giorgio RamadoriRoberto Coppari

Abstract

Tens of millions suffer from insulin deficiency (ID); a defect leading to severe metabolic imbalance and death. The only means for management of ID is insulin therapy; yet, this approach is sub-optimal and causes life-threatening hypoglycemia. Hence, ID represents a great medical and societal challenge. Here we report that S100A9, also known as Calgranulin B or Myeloid-Related Protein 14 (MRP14), is a leptin-induced circulating cue exerting beneficial anti-diabetic action. In murine models of ID, enhanced expression of S100A9 alone (i.e. without administered insulin and/or leptin) slightly improves hyperglycemia, and normalizes key metabolic defects (e.g. hyperketonemia, hypertriglyceridemia, and increased hepatic fatty acid oxidation; FAO), and extends lifespan by at least a factor of two. Mechanistically, we report that Toll-Like Receptor 4 (TLR4) is required, at least in part, for the metabolic-improving and pro-survival effects of S100A9. Thus, our data identify the S100A9/TLR4 axis as a putative target for ID care.

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Datasets Mentioned

BETA
PXD013466

Methods Mentioned

BETA
transmission electron microscopy
nuclear magnetic resonance
electrophoresis
PCR
ELISA
Assay

Software Mentioned

PRISM
IsoQuant
pLIVE
iTEM
HTVI
GraphPad
EasyProt
DT

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