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Breast Cancer Research and Treatment

, Volume 60, Issue 2, pp 153–166 | Cite as

β-adrenoceptor signaling and its control of cell replication in MDA-MB-231 human breast cancer cells

  • Theodore A. Slotkin
  • Jian Zhang
  • Ria Dancel
  • Stephanie J. Garcia
  • Carrie Willis
  • Frederic J. Seidler
Article

Abstract

MDA-MB-231 human breast cancer cells express high β-adrenoceptor levels, predominantly the β2 subtype. Receptor stimulation by isoproterenol evoked immediate reductions in DNA synthesis which were blocked completely by propranolol and were of the same magnitude as effects elicited by high concentrations of 8-Br-cAMP. Isoproterenol-induced inhibition of DNA synthesis was maintained throughout several days of exposure, resulting in a decrement in total cell number, and the effects were augmented by cotreatment with dexamethason; an even greater effect was seen when cAMP breakdown was inhibited by theophylline, with or without addition of isoproterenol. Despite the persistent effect of isoproterenol, receptor downregulation was evident with as little as 1 h of treatment, and over 90% of the receptors were lost within 24 h. Receptor downregulation was paralleled by homologous desensitization of the adenylyl cyclase response to β-adrenoceptor stimulation. Dexamethasone augmented the effects of isoproterenol on DNA synthesis but did not prevent receptor downregulation or desensitization. These results indicate that β-adrenoceptors are effectively linked, through cAMP, to the termination of cell replication in MDA-MB-231 human breast cancer cells, and that activation of only a small number of receptors is sufficient for a maximal effect. Novel pharmacologic strategies that focus on cell surface receptors operating through adenylyl cyclase may offer opportunities to combat cancers that are unresponsive to hormonal agents, or that have developed multidrug resistance.

adenylyl cyclase β-adrenoceptors cell replication cyclic AMP DNA synthesis glucocorticoids 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Theodore A. Slotkin
    • 1
  • Jian Zhang
    • 1
  • Ria Dancel
    • 1
  • Stephanie J. Garcia
    • 1
  • Carrie Willis
    • 1
  • Frederic J. Seidler
    • 1
  1. 1.Department of Pharmacology and Cancer BiologyDuke University Medical CenterDurhamUSA

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