BDNF protein levels are decreased in transformed lymphoblasts from lithium-responsive patients with bipolar disorder |
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Authors: | Tseng Michael Alda Martin Xu Li Sun Xiujun Wang Jun-Feng Grof Paul Turecki Gustavo Rouleau Guy Young L Trevor |
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Institution: | Department of Psychiatry, Centre for Addiction and Mental Health, University of Toronto, Toronto, Ontario, Canda. |
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Abstract: | ObjectiveBrain-derived neurotrophic factor (BDNF) is a key factor in neuroplasticity and has been implicated in the affective disorders; studies have demonstrated elevated BDNF in patients taking lithium and other mood stabilizers. The objective of our study was to analyze BDNF in lithium-responsive patients with bipolar disorder (BD) to further understand the role of BDNF in the pathophysiology of BD.MethodsUsing enzyme-linked immunosorbent assay, we measured transformed B lymphocytes for BDNF protein.ResultsBDNF levels were 36% lower in lymphoblasts from patients with BD (n = 12), compared with matched control participants (n = 13), and 55% lower when compared with their unaffected relatives (n = 14). Lithium significantly decreased BDNF levels in patients with BD and healthy control participants, although BDNF levels remained lower (33%) in the BD group posttreatment.ConclusionDecreased BDNF may constitute part of the pathophysiologic process of BD in a lithium-responsive subgroup of individuals with this disease. A compensatory mechanism protecting the genetically predisposed unaffected relatives from phenotypic expression of BD is suggested.Medical subject headings: bipolar disorder, brain-derived neurotrophic factor, enzyme-linked immunosorbent assay, lithium |
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