Platelet alpha 2-adrenoceptors, defined with agonist and antagonist ligands, in depressed patients, prior to and following treatment.

Abstract:

:Saturation binding of the alpha 2-adrenoceptor antagonist, 3H-yohimbine, and displacement of 3H-yohimbine with the alpha 2-adrenoceptor agonist, UK-14,304, were performed concurrently in platelet membranes obtained from drug-free depressed patients and healthy volunteers. Where possible platelet binding was repeated in depressed patients following treatment. The number and affinity of 3H-yohimbine binding sites did not differ between controls and depressed patients, or when depressed patients were divided on the basis of endogenicity (Newcastle or RDC criteria) or dexamethasone test result. The proportion of alpha 2-adrenoceptor binding sites with high affinity for UK-14,304 and KD values for the two states of the receptor did not differ in the total sample of depressed patients compared to controls. The KD for both states of the receptor and the proportion of sites with high affinity for UK-14,304 was lower in RDC non-endogenous patients than RDC endogenous patients. Treatment did not alter the total number of alpha 2-adrenoceptors or the proportion of sites with high affinity for UK-14,304, but reduced the KD for 3H-yohimbine and the KD of UK-14,304 for the low affinity state of the alpha 2-adrenoceptor.

journal_name

J Affect Disord

authors

Theodorou AE,Lawrence KM,Healy D,Whitehouse AM,White W,Wilton-Cox H,Kerry SM,Horton RW,Paykel ES

doi

10.1016/0165-0327(91)90021-j

subject

Has Abstract

pub_date

1991-11-01 00:00:00

pages

99-106

issue

3

eissn

0165-0327

issn

1573-2517

pii

0165-0327(91)90021-J

journal_volume

23

pub_type

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