PMID: 6411734Aug 1, 1983Paper

Reversible blockage of membrane retrieval and endocytosis in the garland cell of the temperature-sensitive mutant of Drosophila melanogaster, shibirets1

The Journal of Cell Biology
T Kosaka, K Ikeda

Abstract

Temperature-induced structural changes in the cortical region of the garland cell, which is considered to be active in endocytosis, were investigated in a temperature-sensitive, single gene mutant of Drosophila melanogaster, shibirets1 (shi) and wild-type (Oregon-R). At 19 degrees C, both shi and wild type showed similar structural features: an irregularly extended network of labyrinthine channels, coated pits and vesicles, tubular elements and alpha vacuoles. Tannic acid (TA) impregnation showed that coated pits comprised approximately 20-25% of the total coated profiles at 19 degrees C in both shi and wild-type. When flies were incubated in a horseradish peroxidase (HRP) solution for 5 min, organelles such as coated profiles, tubular elements, and alpha vacuoles were labeled. In wild-type at 30 degrees C, minor changes were observed--mainly a decrease in the distribution of the labyrinthine channels and an increase in HRP uptake. On the other hand, in shi at 30 degrees C, the labyrinthine channels were much elongated and their network became far more complex, indicating the expansion of the surface area of the cell. Also, the coated profiles were increased in number while the number of tubular elements was decreased considera...Continue Reading

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