NDLI: Participation of neuronal NO-synthase in regulation of hypothalamus vasopressinergic neurons of rat pups at early stages of postnatal ontogeny

Content Provider	Springer Nature Link
Author	Chernigovskaya, E. V. Taranukhin, A. G. Yamova, L. A. Komissarov, A. B. Glazova, M. V.
Copyright Year	2006
Abstract	To reveal character of interaction of catecholamines (CA) and NO in regulation of development and of the functional state of vasopressinergic (VP-ergic) neurons of supraoptic (SON) and paraventricular (PVN) nuclei, the female rats were injected intraperitoneally with the inhibitor of CA synthesis α-methyl-p-tyrosine, daily, from the 13th to the 20th days of pregnancy. Rat pups born by the females administered with saline at the same period of pregnancy as well as intact pups and adult rats were used as control. Expression of neuronal NO-synthase (nNOS) in neurons of SON and PVN of rat pups at early stages of postnatal development was found to be significantly higher than the definitive level, which allows suggesting participation of NO in development of hypothalamic VP-ergic neurons. The revealed differences of periods of the maximal nNOS expression in the SON and PVN neurons have permitted suggesting development of SON to be completed earlier than that of PVN. The pups exposed to stress at the last third of embryonic development had a long-lasting effect on the state of VP-ergic neurons of the pups after birth. The nNOS expression in neurons does not change, which suggests that NO is not involved in regulation of VP-ergic neurons after exposure to stress at early stages of ontogenesis. A decrease of CA level in the brain at the last third of embryogenesis led to a long preserved decrease of the functional activity of VP-ergic neurons. The nNOS expression in VP-ergic neurons of SON and PVN rose substantially under effect of a compensatory enhancement of tyrosine hydroxylase (TH) expression in neurons of SON and of an increase of the level of CA-ergic innervation of PVN. Thus, we have shown that a decrease of CA level in the embryonic brain leads to an increase of nNOS expression of hypothalamic VP-ergic neurons of rat pups after birth and that the character of NO action on function of VP-ergic neurons does not differ from that of adult animals as soon as at early stages of ontogenesis.
Starting Page	98
Ending Page	108
Page Count	11
File Format	PDF
ISSN	00220930
Journal	Journal of Evolutionary Biochemistry and Physiology
Volume Number	42
Issue Number	1
e-ISSN	16083202
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2006-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biochemistry Evolutionary Biology Animal Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Ecology, Evolution, Behavior and Systematics

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