Opioid addiction is recognized as a chronic relapsing brain disease resulting from repeated exposure to opioid drugs. Cellular and molecular mechanisms underlying the ability of organism to return back to the physiological norm after cessation of drug supply are not fully understood. The aim of this work was to extend our previous studies of morphine-induced alteration of rat forebrain cortex protein composition to the hippocampus. Rats were exposed to morphine for 10 days and sacrificed 24 h (groups +M10 and -M10) or 20 days after the last dose of morphine (groups +M10/-M20 and -M10/-M20). The six altered proteins (≥2-fold) were identified in group (+M10) when compared with group (-M10) by two-dimensional fluorescence difference gel electrophoresis (2D-DIGE). The number of differentially expressed proteins was increased to thirteen after 20 days of the drug withdrawal. Noticeably, the altered level of α-synuclein, β-synuclein, α-enolase and glyceraldehyde-3-phosphate dehydrogenase (GAPDH) was also determined in both (±M10) and (±M10/-M20) samples of hippocampus. Immunoblot analysis of 2D gels by specific antibodies oriented against α/β-synucleins and GAPDH confirmed the data obtained by 2D-DIGE analysis. Label-free quantification identified nineteen differentially expressed proteins in group (+M10) when compared with group (-M10). After 20 days of morphine withdrawal (±M10/-M20), the number of altered proteins was increased to twenty. We conclude that the morphine-induced alteration of protein composition in rat hippocampus after cessation of drug supply proceeds in a different manner when compared with the forebrain cortex. In forebrain cortex, the total number of altered proteins was decreased after 20 days without morphine, whilst in hippocampus, it was increased.

Department of Biochemistry Faculty of Science Charles University Prague Prague 2 Czech Republic

Laboratory of Analysis of Biologically Important Compounds Institute of Physiology of the Czech Academy of Sciences Prague 4 Czech Republic

Laboratory of Membrane Receptors Department of Biomathematics Institute of Physiology of the Czech Academy of Sciences Prague 4 Czech Republic

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Long-term administration of morphine specifically alters the level of protein expression in different brain regions and affects the redox state

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