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Horm Metab Res 2005; 37(2): 84-88
DOI: 10.1055/s-2005-861159
Original Clinical
© Georg Thieme Verlag KG Stuttgart · New York

Time Course of Vasopressin and Oxytocin Secretion after Stress in Adrenalectomized Rats

M.  T.  C.  Laguna-Abreu1 , M.  Koenigkam-Santos1 , A.  M.  D.  Colleta1 , P.  C.  L.  Elias2 , A.  C.  Moreira2 , J.  Antunes-Rodrigues1 , L.  L.  Elias1 , M.  Castro2
  • 1Department of Physiology · School of Medicine of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, Brazil
  • 2Division of Endocrinology - Department of Internal Medicine · School of Medicine of Ribeirao Preto · University of Sao Paulo, Ribeirao Preto, Brazil
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Publikationsverlauf

Received 20 April 2004

Accepted after revision 20 July 2004

Publikationsdatum:
21. März 2005 (online)

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Abstract

To characterize the participation of vasopressin (AVP) and oxytocin (OT) in hypothalamus-pituitary-adrenal regulation after adrenalectomy (ADX), we evaluated corticosterone, ACTH, AVP and OT plasma concentrations and AVP and OT content of the paraventricular nucleus (PVN) at different periods (3 h, 1, 3, 7 and 14 days) in sham or ADX rats under basal conditions and after immobilization stress. ADX animals showed undetectable corticosterone levels, while sham animals showed a marked increase in corticosterone and ACTH 3 h after surgery, then lowering to basal control levels. ADX rats showed high basal ACTH levels with a triphasic response without changes after immobilization. After three hours, the ADX group showed higher OT levels than the sham group. OT was increased after immobilization stress in sham and ADX groups. AVP plasma levels did not change throughout the basal or stress studies in either group. There was a decrease in hypothalamic AVP content 1 and 3 days after ADX under basal and stress conditions. Plasma osmolality showed a significant decrease in the ADX group at 3, 7, and 14 days. In conclusion, there are different pituitary-adrenal axis set points after removal of the glucocorticoid negative feedback. The role of vasopressinergic and oxytocinergic neurons in the ACTH secretion after ADX or immobilization stress appears to differ. Magnocellular AVP is unlikely to contribute to ACTH secretion in response to ADX or immobilization stress. On the other hand, OT is elicited by immobilization stress and might contribute to the ACTH secretion during short-term ADX.

Key words

Hypothalamo-pituitary-adrenal axis · Immobilization stress · Oxytocinergic neurons · Vasopressinergic neurons · Paraventricular nucleus

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M. de Castro, M. D., Ph. D.

Depto de Clínica Médica, Faculdade de Medicina de Ribeirao Preto · USP ·

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