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    GH responsiveness varies during the menstrual cycle.

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    Authors
    Gleeson, Helena K
    Shalet, Stephen M
    Affiliation
    Department of Endocrinology, Christie Hospital, Wilmslow Road, Withington, Manchester M20 4BX, UK. Helena.Gleeson@christie-tr.nwest.nhs.uk
    Issue Date
    2005-12
    
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    Abstract
    OBJECTIVE: The GH-IGF-1 axis is affected by oestrogen. Both endogenous and exogenous oestrogen facilitates the central drive of pulsatile GH secretion. However, the effect on IGF-1 levels is more subtle, and a reduction in GH sensitivity has been proposed. The IGF generation test has confirmed reduced GH sensitivity with high doses of exogenous oestrogen. It is not known, however, whether fluctuant levels of endogenous oestrogen modify GH sensitivity. To investigate this further, women were challenged with the IGF-1 generation test at different stages of the menstrual cycle. METHODS: Nine women (age 38(6) years (mean (s.d.)) with regular menstrual cycles were recruited. An IGF-1 generation test, s.c. injection of 7 mg GH, was performed in the early-follicular (EF), periovulatory (PO) and midluteal (ML) phases. IGF-1, insulin-like growth factor binding protein (IGFBP)-3 and acid-labile subunit (ALS) levels were measured at baseline and 24 h after GH administration. RESULTS: Oestradiol levels were lower in the EF than PO or ML phases (32.6(7.8) vs 69.6(16.2) vs 66.6(23.6) pg/ml respectively (repeated measures ANOVA, P < 0.001)). Baseline IGF-1 was lower, but increment IGF-1 (peak minus baseline) was higher in the EF than PO or ML phases (baseline: 291.8(56.6) vs 335.0(55.2) vs 346.6(78.2) ng/ml (P = 0.008); increment IGF-1: 234.6(59.2) vs 194.7(37.8) vs 185.2(37.3) ng/ml (P = 0.008)). CONCLUSIONS: Increased endogenous oestrogen levels are associated with only a modestly elevated baseline IGF-1 from midcycle onward despite a previously reported twofold increase in GH secretion. In parallel with this apparent GH insensitivity, increased endogenous oestrogen levels are associated with reduction in GH sensitivity evidenced by reduction in increment IGF-1. This may have clinical implications for women with isolated GH deficiency with regular menstrual cycles on a fixed dose of GH. This possibility requires further study.
    Citation
    GH responsiveness varies during the menstrual cycle. 2005, 153 (6):775-9 Eur. J. Endocrinol.
    Journal
    European Journal of Endocrinology
    URI
    http://hdl.handle.net/10541/76409
    DOI
    10.1530/eje.1.02037
    PubMed ID
    16322382
    Type
    Article
    Language
    en
    ISSN
    0804-4643
    ae974a485f413a2113503eed53cd6c53
    10.1530/eje.1.02037
    Scopus Count
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