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. 2022 Aug 8;13:4621. doi: 10.1038/s41467-022-32425-7

Fig. 2. Accumulation of cytoplasmic proinsulin granules in β-cells during chronic ER stress is conserved in rat and human species.

Fig. 2

Fluorescence immunocytochemistry of MIN6 (a), INS1E (d), mouse islets (g) and EndoC βH3 (f), cells treated with CPA for 6 h and 18 h (MIN6), 6 h (INS1E) 18 h (mouse islets) and 72 h (EndoC βH3) for the indicated (color-coded) proteins. Boxes indicated the enlarged regions of images below each panel. b Quantitative analysis of the proinsulin puncta subcellular localization in the indicated treatments of MIN6 cells. c Fluorescence immunocytochemistry of MIN6 cells for the indicated proteins and treatments. e Reconstruction of stacking images represented by the box in d. h Schematic representation of the non-canonical exit of proinsulin from the ER. n, indicates number if cells from 3 independent experiments. The % of cells for the indicated phenotype are given in 2b in colored boxes and columns. Scale bar, 10 μm (a), 20 μm (c, d, f), 50 μm (g).