Postpartum hyperprolactinemia and hyporesponsiveness of growth hormone (GH) to GH-releasing peptide

被引:15
作者
de Zegher, F
Spitz, B
Van den Berghe, G
Lemmens, D
Vanweser, K
Keppens, K
Bowers, CY
机构
[1] Univ Louvain, Dept Pediat, Louvain, Belgium
[2] Univ Louvain, Dept Obstet & Gynecol, Louvain, Belgium
[3] Univ Louvain, Dept Intens Care Med, Louvain, Belgium
[4] Tulane Univ, Dept Endocrinol, New Orleans, LA 70112 USA
关键词
D O I
10.1210/jc.83.1.103
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Human PRL and GH as well as their respective receptors have closely related origins. In peripartal women, physiological hyperprolactinemia is associated with a pronounced hyposomatotropism that remains to be fully characterized. Through paracrine mechanisms, PRL-secreting "pregnancy cells" may modulate the secretory function of somatotropes, which are known to express PRL receptors. Within a randomized, placebo-controlled design, we examined GH responsiveness in 10 nonpregnant women and in 58 mothers either in early (median, 48 h; range, 42-54 h after delivery; all lactating) or late postpartum (median, 10 weeks; range, 3-25 weeks;lactating and nonlactating subgroups), using GH-releasing peptide-1 (GHRP-1; 100-mu g iv bolus) as the GH secretagogue. Baseline serum PRL concentrations were low and similar (median, 5 mu g/L) in nonpregnant controls and nonlactating, late postpartum women and were elevated in lactating women, particularly in the early postpartum period(median, 102 mu g/L), compared to those in the late postpartum period (median, 27 mu g/L). GHRP-1 elicited GH responses in all study groups; lactation was associated with lower and slower GH responses. Serum GH concentrations (20 min after GHRP-1 treatment) in controls (median, 78 mu g/L) were 7- and 5-fold higher than those in lactating women studied, respectively, early or late postpartum. Baseline prolactinemia presented an inverse correlation with GH responsiveness; the higher baseline PRL concentration, the lower and the slower the GH response to GHRP-1. GH hyporesponsiveness in postpartum women is herewith further characterized to include the GHRP pathway. The inverse relationship between baseline prolactinemia and GH responsiveness is consistent with the concept that pregnancy cells may exert, either directly or indirectly, an inhibitory effect on the secretory capacity of somatotropes.
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页码:103 / 106
页数:4
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