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.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Lutz-Bucher B,Boudjada T,Heisler S,Pelletier G,Koch Bdoi
10.1016/s0006-291x(88)81052-0subject
Has Abstractpub_date
1988-08-30 00:00:00pages
83-90issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(88)81052-0journal_volume
155pub_type
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