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Studies on Vinblastine-induced Autophagocytosis in Mouse Liver. IV. Origin of Membranes

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Journal Histochemistry
Specialty Biochemistry
Date 1983 Jan 1
PMID 6139354
Citations 7
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Abstract

The origin of the limiting membranes of autophagic vacuoles (AV) in mouse hepatocytes was studied by cytochemical techniques. Autophagocytosis was induced by an intraperitoneal injection of vinblastine (50 mg/kg). The marker enzymes used were adenosine triphosphatase for the plasma membrane, glucose-6-phosphatase for the endoplasmic reticulum and thiamine pyrophosphatase for the Golgi apparatus and the endoplasmic reticulum. All the three enzymes showed a characteristic localization in both control and vinblastine-treated hepatocytes. The space between the limiting membranes of a few apparently newly formed AV's showed weak glucose-6-phosphatase activity. Neither adenosine triphosphatase nor thiamine pyrophosphatase activities were observed on or between the AV membranes. It was suggested that endoplasmic reticulum membranes may be used as a source of AV membranes in hepatocytes. The lack of glucose-6-phosphatase activity in the limiting membranes even of most of the newly formed AV's suggests a transformation process of the membranes destined to form AV, during which the enzyme activity characteristic for endoplasmic reticulum may disappear from them.

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