Altered binding properties of beta-adrenergic receptors and lack of coupling to adenylate cyclase in P815 mastocytoma cells.

Abstract:

:P815, a murine mastocytoma cell line, possesses beta-adrenergic binding sites as assessed by using [3H]dihydroalprenolol (antagonist) and [3H]hydroxybenzylisoproterenol (agonist). The number of binding sites per cell was 29 000 for the agonist and 75 000 for the antagonist, as determined by direct binding assays and inhibition experiments on intact cells. On membrane preparations from the same cells, binding of alprenolol was only displaceable by antagonists, while stereospecific binding of hydroxybenzylisoproterenol was only displaceable by agonists. The P815 membranes also possessed an adenylate cyclase stimulated by Gpp(NH)p and NaF but not by 1-isoproterenol. The intracellular cAMP level of intact cells was not modulated by 1-isoproterenol or by 1-epinephrine, but was increased by forskolin. These results suggest that the beta-adrenergic receptor of P815 mastocytoma cells is non-functional. This may explain the failure of agonists to stimulate adenylate cyclase activity in these cells.

journal_name

Eur J Pharmacol

authors

Durieu-Trautmann O,Delavier-Klutchko C,Hoebeke J,Strosberg AD

doi

10.1016/0014-2999(85)90717-4

subject

Has Abstract

pub_date

1985-01-22 00:00:00

pages

133-41

issue

2

eissn

0014-2999

issn

1879-0712

pii

0014-2999(85)90717-4

journal_volume

108

pub_type

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