2020, Number 2
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Rev Biomed 2020; 31 (2)
Depressive and antidepressant indices during the forced swim test are differentially associated with the seasonality and estrous cycle in female Wistar rats
Jaffar-Medina V, Rosado-Pérez AL, Flores-Serrano AG, Torres-Escalante JL, Pineda JC
Language: Spanish
References: 21
Page: 69-75
PDF size: 660.88 Kb.
ABSTRACT
Introduction. Both, the influence of antidepressant drugs and the antidepressant
behaviors in animal models are conditioned both by seasons of the year and by
estrus stage in depressive individuals. However, at present, the influence of these
factors remains poorly studied in the animal models. In the forced swimming
test (FST) the depressant indexes are referred to the basal behavior produced in
the early five minutes of the test. In this period, unconditioned depressant- and
antidepressant-like behaviors are developed, and they are the control parameter
of the model, which are used as the basal index to compare the depressive-like
indexes in its second part of the test. Estrous cycle and season affect this test.
However, the influences of these factors have not been studied.
Objective. Identify the influence of season and estrous cycle on the depressant-
(immobility time; IT) and antidepressant-like indexes (CT and ST) in the forced
swimming in a basal condition.
Methods. We measured depressive and antidepressant index, during a five
minute session of forced swimming, at different seasons of the year and estrous
stages in female Wistar rats.
Results. While no differences in the open field test were detected in different
seasons, the IT was larger in the summer or autumn, than in winter during the
forced swim. While ST was larger in the winter than summer or autumn only
during diestrus stage. The estrous stage length, but not the estrous cycle length,
was longer in summer than winter.
Conclusion. These results suggest that estrous cycle and seasons of the year are
involved differentially and selectively in adaptive responses to stress produced
during time learning in FST in female rats and may help in developing indices
to predict sensitivity or resilience in depression.
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