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- W2912921693 abstract "Upon fusion of the secretory granule with the plasma membrane, small molecules are discharged through the immediately formed narrow fusion pore, but protein discharge awaits pore expansion. Recently, fusion pore expansion was found to be regulated by tissue plasminogen activator (tPA), a protein present within the lumen of chromaffin granules in a subpopulation of chromaffin cells. Here, we further examined the influence of other lumenal proteins on fusion pore expansion, especially chromogranin A (CgA), the major and ubiquitous lumenal protein in chromaffin granules. Polarized TIRF microscopy demonstrated that the fusion pore curvature of granules containing CgA-EGFP was long lived, with curvature lifetimes comparable to those of tPA-EGFP–containing granules. This was surprising because fusion pore curvature durations of granules containing exogenous neuropeptide Y-EGFP (NPY-EGFP) are significantly shorter (80% lasting" @default.
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- W2912921693 date "2019-02-01" @default.
- W2912921693 modified "2023-09-30" @default.
- W2912921693 title "Chromogranin A, the Major Lumenal Protein in Chromaffin Granules, Controls Fusion Pore Expansion" @default.
- W2912921693 doi "https://doi.org/10.1016/j.bpj.2018.11.2826" @default.
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