Behavioral control of the stressor modulates stress-induced changes in neurogenesis and fibroblast growth factor-2

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The controllability of stressors modulates many of the consequences of stressor exposure. Here, we used immunohistochemistry to examine neural progenitor cell proliferation and survival and basic fibroblast growth factor-2 in the hippocampus of male rats after controllable or uncontrollable tailshock. A series of identical tailshocks were delivered to yoked pairs of rats. One rat could terminate shocks to both rats of the pair. Reductions in neural progenitor cells were observed at 1–2 days and at 28 days in rats exposed to uncontrollable shock. Controllable shock produced an increase in fibroblast growth factor-2 in the dentate gyrus and CA1 2 h after stress and in the dentate gyrus 24 h after stress. Thus, stressor controllability modulates stress-induced decreases in neurogenesis and increases in fibroblast growth factor-2.

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