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Response of the serotoninergic brain system to social stress of various duration in male mice C57BL/6J and CBA/Lac

Avgustinovich, D.F.; Lipina, T.V.; Kudriavtseva, N.N.

Rossiiskii Fiziologicheskii Zhurnal Imeni I.M. Sechenova 87(4): 532-542

2001

ISSN/ISBN: 0869-8139
PMID: 11449981
Document Number: 540004
The effects of social stress caused by experience of defeats in mice during 3 or 10 consecutive days of intermale confrontations on serotonergic brain activity (5-HT, 5-HIAA levels and 5-HIAA/5-HT ratio) in some brain regions of CBA/Lac (CBA) and C57BL/6J (C57) inbred mice have been studied. It was revealed the significant changes in 5-HT methabolism in the brain regions of defeated mice (losers) of CBA strain after 3 intermale confrontations. However, after 10 days of social stress these changes (excluded amygdala) turned to the control measures testifying to the adaptive mechanisms of serotonergic system in CBA losers. In C57 strain, the three-day social stress produced the mild changes in the brain serotonergic activity both quantitatively as well as qualitatively. Nevertheless, losers subjected to ten-day intermale confrontations had more expressed changes in 5-HT, 5-HIAA levels of 5-HIAA/5-HT ratios in the brain regions studied. It seems that long lasting social stress induced the development of disbalance of the brain serotonergic activity in C57 losers: it was shown the hyperactivity in the hypothalamus and hypoactivity in the amygdala and nucl. accumbens. Apparently, this cause leads to the development of the pronounced anxiety shown earlier in this mouse strain.

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