PMID: 6105141Jan 1, 1980Paper

Studies on vinblastine-induced autophagocytosis in mouse liver. II. Origin of membranes and acquisition of acid phosphatase

Histochemistry
P Hirsimäki, H Reunanen

Abstract

The origin of the membranes of autophagic vacuoles (AV) and acquisition of acid phosphatase into AV's were studied in vinblastine-induced autophagocytosis (VBL, 50 mg/kg, i.p.) in mouse hepatocytes. Using unbuffered OsO4, very intense staining was observed in the outer cisternae of the Golgi apparatus and also frequently in the cavity between the double membranes obviously destined to form AV's as well as in the cavity between the double membranes of newly formed AV's. There may occur a transformation process in the membranes limiting an AV analogous to that observed at the Golgi cisternae. The transformation of the outer AV membrane occurs independently of fusion with lysosomes. Inosine diphosphatase activity was localized within the cisternae and on the membranes of the endoplasmic recticulum and occasionally within the innermost cisterna of the Golgi apparatus. The results together with the unbuffered OsO4-staining pattern suggest that the membranes of most AV's are derived from the transformed smooth surfaced cisternae of the endoplasmic reticulum which do not have inosine diphosphatase activity. Acid phosphatase activity was localized in lysosomes, occasionally within the innermost cisternae of the Golgi apparatus, between...Continue Reading

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Citations

Jan 1, 1988·Comparative Biochemistry and Physiology. A, Comparative Physiology·H ReunanenE L Punnonen
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