AI Article Synopsis
- The study aimed to investigate how the pituitary proopiomelanocortin (POMC) response varies between women undergoing vaginal delivery and caesarean section stress, focusing on hormone interactions during these processes.
- Blood samples were collected from 10 women in labor and 16 women undergoing elective caesarean sections to measure levels of various hormones and POMC fragments at different stages of delivery.
- Results indicated that while the corticotroph-type POMC system was activated in both delivery methods, the melanotroph-type system showed no increase, and significant decreases in sexual steroids were observed.
Article Abstract
Objective: The aim of the study was to determine the reaction of the melanotroph and corticotroph-type pituitary proopiomelanocortin (POMC) response to vaginal delivery and caesarean section stress. Furthermore, the relationship between the release of pituitary POMC fragments, gonadotropins and sexual steroids were examined.
Study Design: Blood samples were obtained from 10 women in labour on arrival in the birth room (t(A)), at cervix dilatation of 5 cm (t(B)) and immediately after spontaneous delivery (t(C)) and in 16 patients undergoing elective caesarean section before induction of anaesthesia (t(B)) and immediately after delivery (t(C)). Samples were analysed for cortisol, ACTH, authentic beta-endorphin, beta-endorphin immunoreactive material (IRM), acetyl-N-beta-endorphin IRM (NAC), beta-lipotropin (beta-LPH) IRM, oestradiol (E(2)), progesterone (P), prolactin (PRL), FSH and LH.
Results: NAC representing the melanotroph-type pituitary POMC system did not increase during the course of caesarean section or spontaneous labour. In contrast, a significant increase of beta-endorphin IRM, beta-LPH IRM and ACTH were observed, representing an activation of the corticotroph-type POMC system. Highly significant correlations between POMC fragment concentrations during caesarean section and spontaneous labour were also observed. Sexual steroids (E(2) and P) decreased significantly. Except for beta-endorphin IRM and E(2) in course of spontaneous delivery no significant correlation was observed between POMC fragment and gonadotropins or sexual steroids.
Conclusion: Caesarean section and spontaneous delivery activated the corticotroph but not the melanotroph POMC system.
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| http://dx.doi.org/10.1016/j.ejogrb.2007.02.004 | DOI Listing |
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