Fluorescently labeled endocytic cargos enable imaging of caveolar endocytosis in the intact zebrafish intestine. Fluorescently labeled endocytic cargos.

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Fluorescently labeled endocytic cargos enable imaging of caveolar endocytosis in the intact zebrafish intestine. Fluorescently labeled endocytic cargos enable imaging of caveolar endocytosis in the intact zebrafish intestine. (A) Representative images show that the caveolar-specific cargos Alexa Fluor–albumin and BODIPY–d-LacCer are internalized from the basolateral PM of enterocytes, but not the intestinal lumen. In contrast, the cargo transported specifically by clathrin-coated vesicles, BODIPY–l-LacCer, is transported into enterocytes from both the basolateral and luminal PMs. BB, brush border; L, lateral membrane; B, basolateral membrane; I, intracellular; N, nucleus; arrowhead, intracellular puncta. (B) The mean fluorescence intensity of Alexa Fluor–albumin and BODIPY–d-LacCer on the lateral PM of enterocytes is significantly greater following basolateral injection compared to luminal injection. In contrast, the mean fluorescence intensity of BODIPY–l-LacCer on the lateral PM of enterocytes is the same following basolateral and luminal injection. Data is presented relative to lateral PM mean fluorescence intensity following luminal injection. Mean±s.e.m, n=3: nine fish per replicate, three areas of each region per fish; Student's t-test; *P<0.05. Jessica P. Otis et al. Dis. Model. Mech. 2017;10:283-295 © 2017. Published by The Company of Biologists Ltd