Abstract:
:The hallmarks of age-related immune senescence are chronic inflammation, aberrant expansion of effector memory, and loss of naive T lymphocytes due in part to systemic activation of innate immune sensor NLRP3 inflammasome in myeloid lineage cells. The endogenous mechanisms that regulate inflammasome activation during aging are unknown. Here, we present evidence that growth hormone receptor (GH-R)-dependent downregulation of NLRP3 inflammasome in macrophages is linked to pro-longevity effects that maintain immune system homeostasis in aging. Deletion of GH-R prevented the macrophage-driven age-related activation of inflammasome in response to NLRP3 ligands and also increased the preservation of naive T cells, even in advanced age and with higher IFNγ secretion from effector cells. The mechanism of inflammasome inhibition is linked to autocrine somatotropic axis as ablation of IGF1R in macrophages lowered the NLRP3 inflammasome activation. Together, our findings show that functional somatotropic axis in macrophages controls inflammation, thus linking NLRP3-mediated innate immune signaling to health span and longevity.
journal_name
Cell Repjournal_title
Cell reportsauthors
Spadaro O,Goldberg EL,Camell CD,Youm YH,Kopchick JJ,Nguyen KY,Bartke A,Sun LY,Dixit VDdoi
10.1016/j.celrep.2016.01.044subject
Has Abstractpub_date
2016-02-23 00:00:00pages
1571-1580issue
7issn
2211-1247pii
S2211-1247(16)30022-5journal_volume
14pub_type
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