Nuclear Transport in 3T3 Fibroblasts: Effects of Growth Factors, Transformation, and Cell Shape

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 1988 Jan 1

PMID 2448310

Citations 14

Authors

L W Jiang

M Schindler

Affiliations

Soon will be listed here.

Abstract

Nucleocytoplasmic transport of fluorescent-labeled macromolecules was investigated in transformed and nontransformed 3T3 fibroblasts. Insulin and epidermal growth factor enhanced transport three-fold after 1-2-h incubation with nontransformed adhering fibroblasts; no enhancement of transport was observed for spherical unattached fibroblasts. The concentration of growth factor for maximal enhancement was 3-10 nM. Nuclear transport for Kirsten murine sarcoma virus-transformed BALB/c 3T3 fibroblasts, however, was maximally enhanced before addition of growth factors; addition of insulin or epidermal growth factor causes no additional transport enhancement. Transformation also minimizes cell shape effects on macromolecular nuclear transport. These results provide evidence that protein growth factors and oncogenic transformation may use a similar mechanism for activation of nuclear transport.

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