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Journal compilation \u00a9 2012 John Wiley &amp; Sons A\/S.<\/jats:p><jats:p><jats:bold>Objectives:\u2002<\/jats:bold> Gamma aminobutyric acid (GABA) and glutamate (Glu) are the major neurotransmitters of the human central nervous system, and their actions are determined by specific transporters. Several studies suggest that GABA\u2010 and Glu\u2010uptake mechanisms are modified in patients with bipolar disorder (BD). We explored the functionality of the GABA and Glu transporters in three groups of patients with BD, each with a different polarity of index episode (manic, depressive, or euthymic) at the time of blood draw.<\/jats:p><jats:p><jats:bold>Methods:\u2002<\/jats:bold> Forty patients with a diagnosis of BD, according to DSM\u2010IV\u2010TR criteria, and 15 healthy subjects were enrolled in the study. GABA and Glu uptake were evaluated in freshly prepared platelets using [<jats:sup>3<\/jats:sup>H]GABA or [<jats:sup>3<\/jats:sup>H]glutamate.<\/jats:p><jats:p><jats:bold>Results:\u2002<\/jats:bold> Compared to controls, GABA uptake was significantly increased in patients with depressive episodes and significantly decreased in subjects with manic episodes. Glu uptake was significantly increased in patients with index manic episodes and in euthymic patients compared to healthy controls. Moreover, a positive correlation was found between GABA platelet uptake and Hamilton Depression Rating Scale scores and between Glu platelet uptake and Young Mania Rating Scale scores in patients with manic episodes.<\/jats:p><jats:p><jats:bold>Conclusions:\u2002<\/jats:bold> We found a relationship between GABA\u2010 and Glu\u2010uptake levels and the polarity of episodes in patients with BD. Our data suggest that the functionality of both GABA and Glu transporters could represent a useful neurobiological marker to characterize the real polarity of an index episode of illness in patients with BD.<\/jats:p>","DOI":"10.1111\/j.1399-5618.2012.01005.x","type":"journal-article","created":{"date-parts":[[2012,5,2]],"date-time":"2012-05-02T11:04:25Z","timestamp":1335956665000},"page":"301-308","source":"Crossref","is-referenced-by-count":16,"title":["Platelet uptake of GABA and glutamate in patients with bipolar disorder"],"prefix":"10.1111","volume":"14","author":[{"given":"Simona","family":"Daniele","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eleonora","family":"Da 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