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Loss of the post-translational control of nutrient transport in in vitro and in vivo virus-transformed chicken cells

✍ Scribed by James F. Perdue

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
718 KB
Volume
89
Category
Article
ISSN
0021-9541

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✦ Synopsis

Abstract

The removal of serum from the medium of uninfected fibroblasts decreased the rate of uptake of uridine, 2‐deoxyglucose, α‐aminoisobutyrate and thymidine. Its subsequent addition rapidly and reversibly stimulated the uptake of all the nutrients but thymidine and this response was not inhibited by treatment of the cells with cycloheximide. The cycloheximide insensitive, rapid increase in the rate of transport has been designated post‐translational control. The nutrient transport systems in chick embryo fibroblasts transformed in vitro with avian sarcoma viruses and virus‐induced cultured chicken tumor cells do not respond to serum removal or addition. Two possible levels for the control of nutrient transport, i.e., mitogen receptor occupancy and mitogen‐induced activation of the transport system, are presented to explain these observations.

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