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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The mannose-6-phosphate receptor for lysosomal enzymes is concentrated in cis Golgi cisternae.

Mannose-6-phosphate (Man-6-P) receptors for lysosomal enzymes were localized by immunocytochemistry in several secretory and adsorptive cell types using monospecific antireceptor antibodies. By immunofluorescence, the receptors were found in the Golgi region of polarized cells. When localized by immunoperoxidase at the electron microscope level, they were detected in Golgi cisternae, coated vesicles, endosomes, and lysosomes of all cell types examined (hepatocytes, exocrine pancreatic and epididymal epithelia). Within the Golgi complex, immunoreactive receptors were restricted in their distribution to one or two cisternae on the cis side of the Golgi stacks. They were not detected in trans Golgi or GERL cisternae. Based on their high concentration of Man-6-P receptors, we propose that the cis Golgi cisternae represent the site where the secretory and lysosomal pathways diverge: lysosomal enzymes bearing the Man-6-P recognition marker bind to Man-6-P receptors in this location and are delivered to endosomes and lysosomes via coated vesicles.[1]


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