Microtubule Assembly in Cultivated Greene Melanoma Cells is Stimulated by Dibutyryl Adenosine 3':5'-cyclic Monophosphate or Cholera Toxin

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 1976 Dec 1

PMID 186462

Citations 7

Authors

A M DiPasquale

J McGuire

G Moellmann

S J Wasserman

Affiliations

Soon will be listed here.

Abstract

Both dibutyryl cyclic AMP (DBcAMP) and cholera toxin promote the formation and elongation of processes of cultivated Greene hamster melanoma cells. The formation and maintenance of these processes, which contain many microtubules, are sensitive to colcemid and vinblastine. Tubulin was measured by [3H]colchicine binding and by acrylamide gel electrophoresis. We found that DBcAMP or cholera toxin increases the ratio of polymerized to unpolymerized tubulin but not the total amount of tubulin per cell. The sum of the lengths of microtubules per unit area was significantly greater in cells treated with DBcAMP than in control cells. Our findings support the hypothesis that cyclic AMP promotes the elongation of cell processes by stimulating the assembly of microtubules from existing tubulin.

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