Abstract
Autophagic-lysosomal degradation is essential for the maintenance of normal homeostasis in eukaryotic cells. Several types of such self-degradative and recycling pathways have been identified. From these, probably the least known autophagic process is crinophagy, during which unnecessary or obsolete secretory granules directly fuse with late endosomes/lysosomes as a means of rapid elimination of unused secretory material from the cytoplasm. This process was identified in 1966, but we are only beginning to understand the molecular mechanisms and regulation of crinophagy. In this review, we summarize the current examination methods and possible model systems, discuss the recently identified factors that are required for crinophagy, and give an overview of the potential medical relevance of this process.
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