Binding and effect of atrial natriuretic factor on cyclic GMP formation and alpha-MSH secretion of intermediate pituitary cells.

Abstract:

:The present study shows for the first time that in proopiomelanocortin cells of the rat intermediate pituitary gland ANF binds to two receptor forms, with apparent molecular weights of 150K and 70K. Scatchard plots revealed specific and high affinity non-interacting sites, with a KD value of about 3 nM and a density of 7,000 sites/cell. The presence of these binding sites was further confirmed by autoradiographic studies. Activation of these receptors led to an increase in cellular content of cGMP, with half-maximal effect being elicited with about 5 nM ANF, while cAMP formation was unaltered. Alpha-MSH secretion of intermediate pituitary cells was unaffected by ANF, whether the cells were incubated in the absence or presence of corticotropin-releasing factor or bromocryptine. These data thus indicate the presence of multiple ANF receptor sites in the intermediate pituitary which are coupled to cell production of cGMP, but independent of alpha-MSH secretion.

authors

Lutz-Bucher B,Boudjada T,Heisler S,Pelletier G,Koch B

doi

10.1016/s0006-291x(88)81052-0

subject

Has Abstract

pub_date

1988-08-30 00:00:00

pages

83-90

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(88)81052-0

journal_volume

155

pub_type

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