BACKGROUND: Prior work reported elevated gray matter (GM) lactate and Glx (glutamate + glutamine + GABA) concentrations in unmedicated patients with bipolar disorder (BP) compared with healthy controls (HC). This study examined whether lithium (Li) and valproic acid (VPA) treatment modulated these chemicals. METHODS: A subset of previously reported BP patients were treated with Li (n = 12, 3.6 +/- 1.9 months) or VPA (n = 9, 1.4 +/- 1.7 months) and compared untreated HC subjects (n = 12, 2.9 +/- 2.4 months) using proton echo-planar spectroscopic imaging. Regression analyses (voxel gray/white composition by chemistry) were performed at each time point, and change scores computed. Metabolite relaxation and regions of interest (ROI) were also examined. RESULTS: Across treatment, Li-treated BP subjects demonstrated GM Glx decreases (Li-HC, p =.08; Li-VPA p =.04) and GM myo-inositol increases (Li-HC p =.07; Li-VPA p =.12). Other measures were not significant. Serum Li levels were positively correlated with Glx decreases at the trend level. CONCLUSIONS: Li treatment of BP was associated with specific GM Glx decreases and myo-inositol increases. Findings are discussed in the context of cellular mechanisms postulated to underlie Li and VPA therapeutic efficacy.
BACKGROUND: Prior work reported elevated gray matter (GM) lactate and Glx (glutamate + glutamine + GABA) concentrations in unmedicated patients with bipolar disorder (BP) compared with healthy controls (HC). This study examined whether lithium (Li) and valproic acid (VPA) treatment modulated these chemicals. METHODS: A subset of previously reported BP patients were treated with Li (n = 12, 3.6 +/- 1.9 months) or VPA (n = 9, 1.4 +/- 1.7 months) and compared untreated HC subjects (n = 12, 2.9 +/- 2.4 months) using proton echo-planar spectroscopic imaging. Regression analyses (voxel gray/white composition by chemistry) were performed at each time point, and change scores computed. Metabolite relaxation and regions of interest (ROI) were also examined. RESULTS: Across treatment, Li-treated BP subjects demonstrated GM Glx decreases (Li-HC, p =.08; Li-VPA p =.04) and GM myo-inositol increases (Li-HC p =.07; Li-VPA p =.12). Other measures were not significant. Serum Li levels were positively correlated with Glx decreases at the trend level. CONCLUSIONS: Li treatment of BP was associated with specific GM Glx decreases and myo-inositol increases. Findings are discussed in the context of cellular mechanisms postulated to underlie Li and VPA therapeutic efficacy.
Authors: Marquis P Vawter; Abdul Rezzak Hamzeh; Edgar Muradyan; Olivier Civelli; Geoffrey W Abbott; Amal Alachkar Journal: Mol Neuropsychiatry Date: 2019-08-08
Authors: In Kyoon Lyoo; Stephen R Dager; Jieun E Kim; Sujung J Yoon; Seth D Friedman; David L Dunner; Perry F Renshaw Journal: Neuropsychopharmacology Date: 2010-03-31 Impact factor: 7.853
Authors: C I Giakoumatos; P Nanda; I T Mathew; N Tandon; J Shah; J R Bishop; B A Clementz; G D Pearlson; J A Sweeney; C A Tamminga; M S Keshavan Journal: J Psychiatr Res Date: 2014-12-23 Impact factor: 4.791
Authors: D G Kondo; T L Hellem; X-F Shi; Y H Sung; A P Prescot; T S Kim; R S Huber; L N Forrest; P F Renshaw Journal: AJNR Am J Neuroradiol Date: 2014-02-20 Impact factor: 3.825