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- W4385069596 abstract "<p>Altered endoplasmic reticulum (ER) Ca2+ signaling has been linked with β cell dysfunction and diabetes development. Store-operated Ca2+ entry (SOCE) replenishes ER Ca2+ through reversible gating of plasma membrane Ca2+ channels by the ER Ca2+ sensor, stromal interaction molecule 1 (STIM1). To characterize the <em>in vivo</em> impact of STIM1 loss, mice with a β cell-specific STIM1 deletion (STIM1Δβ mice) were generated and challenged with high-fat diet. Interestingly, β cell dysfunction was observed in female, but not male, mice. Female STIM1Δβ mice displayed reductions in β cell mass, a concomitant increase in α cell mass, and reduced expression of markers of β cell maturity, including MafA and UCN3. Consistent with these findings, STIM1 expression was inversely correlated with HbA1c levels in islets from female, but not male, organ donors. Mechanistic assays demonstrated that the sexually dimorphic phenotype observed in STIM1Δβ mice was due, in part, to loss of signaling through the noncanonical 17-β estradiol receptor (GPER1), as GPER1 knockdown and inhibition led to a similar loss of expression of β cell maturity genes in INS-1 cells. Together, these data suggest that STIM1 orchestrates pancreatic β cell function and identity through GPER1-mediated estradiol signaling. </p> <p> </p>" @default.
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- W4385069596 date "2023-07-21" @default.
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- W4385069596 title "<strong>Stromal Interaction Molecule 1 Maintains β Cell Identity and Function in Female Mice through Preservation of G Protein-Coupled Estrogen Receptor 1 Signaling </strong>" @default.
- W4385069596 doi "https://doi.org/10.2337/figshare.23710011.v1" @default.
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