Abstract
Experiments were conducted to test the concept that the results of secretion studies employing pancreatic tissue slices are significantly biased by the distribution of exocrine secretory proteins between the tissue and the incubation medium. The findings demonstrate (1) that the kinetics of release of pulse-labelled secretory proteins from cholinergically-stimulated tissue slices are independent of the concentration of exogenous exocrine secretory proteins and (2) that if there are bidirectional fluxes of secretory proteins across the cell membrane of pancreatic exocrine cells, these fluxes do not account for the fractional release of pulse-labelled secretory proteins.
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