Document Detail

Pregnancy and sex steroid hormones enhance circulating calcitonin gene-related peptide concentrations in rats.
MedLine Citation:
PMID:  10739848     Owner:  NLM     Status:  MEDLINE    
Calcitonin-gene-related peptide (CGRP) is a 37 amino acid neuropeptide synthesized primarily in dorsal root ganglia (DRG) and distributed widely in the perivascular nerves, suggesting that this peptide may play a role in the regulation of peripheral vascular tone. Since female sex steroid hormones have been implicated in the regulation of peripheral vascular tone during pregnancy, we postulated that they may alter the concentration of CGRP in the circulation and thus modulate the increased blood flow observed during pregnancy. In the present study, we measured changes in plasma concentrations of CGRP in non-pregnant, pregnant, and post-partum rats. Groups of ovariectomized rats were treated s.c. for 3 days either with 17beta-oestradiol (2.5 microg per injection twice daily), progesterone (2 mg per injection twice daily), or vehicle. Another group of adult, non-pregnant rats at dioestrus stage of the oestrous cycle was also used in this study. Plasma concentrations of CGRP were higher (P < 0.05) in rats on day 19 of pregnancy (22.0 +/- 3.0 pmol/l) compared to that during delivery (5. 0 +/- 2.0), post-partum day 2 (2.0 +/- 0.7) or in non-pregnant (4.9 +/- 1.6) state. Furthermore, in adult ovariectomized (6.0 +/- 0.6) rats, plasma CGRP concentrations were increased significantly (P < 0. 05) by oestradiol (10.0 +/- 1.0), progesterone (9.5 +/- 1.0) and oestradiol + progesterone (14.0 +/- 1.0). Thus, circulating concentrations of CGRP are elevated during pregnancy and by oestrogen and progesterone, suggesting that the elevated concentrations of CGRP may play an important role in vascular adaptations that occur during pregnancy.
P R Gangula; S J Wimalawansa; C Yallampalli
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Human reproduction (Oxford, England)     Volume:  15     ISSN:  0268-1161     ISO Abbreviation:  Hum. Reprod.     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-05-05     Completed Date:  2000-05-05     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8701199     Medline TA:  Hum Reprod     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  949-53     Citation Subset:  IM    
Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas, USA.
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MeSH Terms
Calcitonin Gene-Related Peptide / blood*
Estradiol / administration & dosage,  pharmacology
Gonadal Steroid Hormones / pharmacology*
Postpartum Period
Pregnancy, Animal / blood*
Progesterone / administration & dosage,  pharmacology
Rats, Sprague-Dawley
Grant Support
Reg. No./Substance:
0/Gonadal Steroid Hormones; 50-28-2/Estradiol; 57-83-0/Progesterone; 83652-28-2/Calcitonin Gene-Related Peptide

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