A TRPC1-mediated increase in store-operated Ca2+ entry is required for the proliferation of adult hippocampal neural progenitor cells

Cell Calcium
Maoquan LiZhengping Yu

Abstract

Adult hippocampal neurogenesis plays an important role in brain function and neurological diseases. Adult neural progenitor cell (aNPC) proliferation is a critical first step in hippocampal neurogenesis. However, the mechanisms that modulate aNPC proliferation have not been fully identified. Ample evidence has demonstrated that cell proliferation is dependent on the intracellular Ca(2+) concentration. We hypothesized that store-operated Ca(2+) channels (SOCs), which are ubiquitously expressed in all cell types, participate in aNPC proliferation. We found that store-operated Ca(2+) entry (SOCE) was involved in the proliferation of aNPCs and that 2-APB, Gd(3+) and SKF96365, antagonists of SOCE and canonical transient receptor potential (TRPC), respectively, inhibited the increase in SOCE and aNPC proliferation. We therefore analyzed the expression of TRPCs in aNPCs and showed that TRPC1 is the most significantly upregulated member under proliferative conditions. Interestingly, knockdown of TRPC1 and using an antibody against TRPC1 markedly reduced the degree of SOCE and aNPC proliferation. In parallel, we observed the suppression of aNPC proliferation was found to be associated with cell cycle arrest in G0/G1 phase. Furthermore, ...Continue Reading

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