Loss of Ca²⁺ entry via Orai-TRPC1 induces ER stress, initiating immune activation in macrophages.

ABSTRACT: Activation of cellular stresses is associated with inflammation; however, the mechanisms are not well identified. Here, we provide evidence that loss of Ca²⁺ influx induces endoplasmic reticulum (ER) stress in primary macrophages and in murine macrophage cell line Raw 264.7, in which the unfolded protein response is initiated to modulate cytokine production, thereby activating the immune response. Stressors that initiate the ER stress response block store-dependent Ca²⁺ entry in macrophages prior to the activation of the unfolded protein response. The endogenous Ca²⁺ entry channel is dependent on the Orai1-TRPC1-STIM1 complex, and the presence of ER stressors decreased expression of TRPC1, Orai1 and STIM1. Additionally, blocking Ca²⁺ entry with S

SUBMITTER: Nascimento Da Conceicao V 

PROVIDER: S-EPMC10682644 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature