Abstract:
:A substantial number of studies have demonstrated increased imidazoline receptors (I1 binding sites) on platelets of depressed patients and downregulation following antidepressant treatments. Herein, imidazoline receptor binding protein (IRBP) antiserum was used to quantify imidazoline receptors on platelets of depressed patients before and after treatment with the atypical aminoketone antidepressant, bupropion. Western blots revealed an increase in IRBP-immunodensity (p = 0.01, two-tailed) in a 33 kDa protein band in untreated depressed patients (n = 21) as compared with controls (n = 17). This band has been positively correlated with I1 binding sites on platelets. Following 6 weeks' treatment with bupropion, IRBP-immunodensity was downregulated in depressed patients (p = 0.03, paired t-test); predominantly in responders (p = 0.005). Patients non-responsive to bupropion (n = 5) were significantly different from responders (p = 0.05) by exhibiting no elevation in IRBP-immunodensity at pre-treatment and no downregulation of the 33 kDa band after treatment. IRBP-immunodensity was negatively correlated (r = -0.79, p = 0.01) with plasma concentrations of bupropion and its metabolites at week-4 of BUP treatment. Thus, a 33-kDa IRBP on platelet plasma membranes is elevated in depression and normalized in responders to bupropion.
journal_name
J Psychiatr Resjournal_title
Journal of psychiatric researchauthors
Zhu H,Halaris A,Madakasira S,Pazzaglia P,Goldman N,DeVane CL,Andrew M,Reis D,Piletz JEdoi
10.1016/s0022-3956(99)00009-6subject
Has Abstractpub_date
1999-07-01 00:00:00pages
323-33issue
4eissn
0022-3956issn
1879-1379pii
S0022-3956(99)00009-6journal_volume
33pub_type
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