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. 1977 Aug;74(8):3404–3408. doi: 10.1073/pnas.74.8.3404

Effects of colchicine on cyclic AMP levels in human leukocytes*

Stephen A Rudolph 1,2, Paul Greengard 1,2, Stephen E Malawista 1,2
PMCID: PMC431582  PMID: 198784

Abstract

The increase in human leukocyte adenosine 3′:5′-cyclic monophosphate (cyclic AMP) levels seen in response to various substances was markedly potentiated by colchicine and other agents that affect microtubule assembly. Addition of dl-isoproterenol (2 μM) or prostaglandin E1 (10 μM), together with the phosphodiesterase inhibitor isobutylmethylxanthine (1 mM), caused a much greater increase in cyclic AMP in colchicine-pretreated cells than in control cells. With isoproterenol (2 μM) plus isobutylmethylaxanthine (1 mM), cyclic AMP levels rose about 3-fold but, in combination with colchicine, these drugs caused a more than 15-fold increase in cyclic AMP. The effects of colchicine were both time- and dose-dependent; they could be seen within 1 min after addition of colchicine or at concentrations as low as 10 nM. In addition to its potentiation of hormonally induced increases in cyclic AMP levels, colchicine also potentiated the effect of isobutylmethylxanthine alone on leukocyte cyclic AMP levels. Vinblastine, vincristine, podophyllotoxin, and oncodazole all had effects similar to those of colchicine but lumicolchicine did not. The data suggest that cytoplasmic microtubules interact with the leukocyte plasma membrane to impose constraints on the expression of hormone-sensitive adenylate cyclase; the therapeutic effects of colchicine may depend in part upon the relaxation of such constraints. Moreover, the synergism described here between colchicine-like agents and hormones is of potential therapeutic importance in clinical conditions in which either alkaloid or hormone has been useful separately.

Keywords: microtubules, adenylate cyclase, catecholamines, prostaglandins

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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