{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T19:37:51Z","timestamp":1790278671382,"version":"4.1.0"},"reference-count":62,"publisher":"Canadian Science Publishing","issue":"1","license":[{"start":{"date-parts":[[2018,1,1]],"date-time":"2018-01-01T00:00:00Z","timestamp":1514764800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Psychiatry Neurosci"],"published-print":{"date-parts":[[2018,1]]},"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Many studies have measured central and peripheral \u03b3-aminobutyric acid (GABA) levels in patients with depression. We performed a meta-analysis to provide an objective overview of GABA changes in those with unipolar or bipolar depression.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>After a systematic database search, original data were extracted with the help of seminal authors to calculate standardized mean differences. We compared GABA levels between patients with current major depressive episodes and controls, between euthymic patients and controls, and in patients before and after treatment. We performed meta-regressions to explore the influence of demographic and clinical variables on GABA significant mean differences.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>For unipolar depression, central and peripheral GABA levels were diminished in currently depressed patients, but normal in euthymic patients, compared with the healthy controls. For bipolar disorder, GABA levels were diminished in medication-free patients, but seemed to be normalized in medicated patients, compared with the healthy controls. We found no significant association with demographic or clinical variables.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Limitations<\/jats:title>\n                    <jats:p>There was a great heterogeneity across studies, probably because of the substantial variation of clinical characteristics in the included samples. Many subanalyses were performed to assess how the diagnosis, medications, or the type of measurements of peripheral or central GABA levels may affect the main results.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>The GABA levels evolved differentially in patients with unipolar and bipolar disorders. Our results suggest that GABA levels could represent a biomarker of symptomatic states in patients with unipolar disorder and would be normalized by mood stabilizers in those with bipolar disorder.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1503\/jpn.160228","type":"journal-article","created":{"date-parts":[[2017,12,18]],"date-time":"2017-12-18T18:21:25Z","timestamp":1513621285000},"page":"58-66","source":"Crossref","is-referenced-by-count":66,"title":["Meta-analysis of central and peripheral \u03b3-aminobutyric acid levels in patients with unipolar and bipolar depression"],"prefix":"10.1139","volume":"43","author":[{"given":"Bruno","family":"Romeo","sequence":"first","affiliation":[{"name":"From the AP-HP, Piti\u00e9-Salp\u00eatri\u00e8re Hospital, Department of Psychiatry, Paris, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Walid","family":"Choucha","sequence":"additional","affiliation":[{"name":"From the AP-HP, Piti\u00e9-Salp\u00eatri\u00e8re 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