[Modifications of hypothalamic neurohormone expression in animal model of post-traumatic stress disorder].

: Neuroendocrine mechanisms of development of anxiety-like state in rats in experimental model of human post-traumatic stress disorder (PTSD), referred to as stress-restress paradigm, have been studied. Immunocytochemistry has revealed significant increase of CRH expression in both parvo- and magnocellular subdivisions of paraventricular nuclei up to 10th post-stress day. Significant reduction of vasopressin expression in rats' hypothalamic paravntricular nuclei has been detected on the 1st post-stress day. Vasopressin immunoreactivity in hypothalamus of stressed animals was indistinguishable from that in control group on the 10th post-stress day only in parvocellular subdivision of the paraventricular nucleus, while it was increased in magnocellular subdivision of the nucleus in experimental group compared to controls. The results imply a plausible role of hypothalamic vasopressin along with CRH on the development of PTSD.