Cytochemical localization of lectin labeled vesicles in GERL region of hepatoma ascites cells |
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Authors: | P C Moller J J Wang M Yokoyama J P Chang |
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Institution: | (1) Division of Cell Biology, Department of Human Biological Chemistry and Genetics, Graduate School of Biomedical Sciences, The University of Texas Medical Branch, 77550 Galveston, Texas, USA;(2) Present address: Department of Biomorphics, NDMC, P.O. Box 8244, (107) Taipei, Taiwan Republic of China;(3) Present address: Department of Urology. Branch Hospital, Faculty of Medicine, The University of Tokyo, 3-28-6 Meijirodai Bunkyo-Ku, Tokyo, Japan |
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Abstract: | Summary The fate of lectin labeled internalized plasma membrane in the ascites tumor form of the Chang rat hepatoma growing under in vivo and in vitro conditions was investigated cytochemically. Ascites cells were incubated in Concanavalin A (Con A) and horseradish peroxidase (PO), either with or without prior glutaraldehyde fixation and subsequently treated with 3 ,3-diaminobenzidine. In cells fixed before Con-A-PO labeling the reaction product was localized as a continuous and even layer upon the external surface of the plasma membrane. If unfixed cells were treated with Con A, coupled with PO at 4°C and reinbated in phosphate buffered saline at 37°C for varying periods of time, the Con-A-PO layer was of irregular thickness. In as little as 15 min of reincubation endocytotic vesicles containing PO positive material were closely associated with GERL components of the Golgi Apparatus. Localization of acid phosphatase (ACPase) within GERL vesicles, similar in size and location to those containing Con-A-PO reaction product, indicates that the Con-A-PO labeled vesicles may be a component of the Golgi apparatus in hepatoma cells.Supported by NIH Grant CA 16663. |
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