The sweating apparatus in growth hormone deficiency, following treatment with r-hGH and in acromegaly

Wohaib Hasan, Timothy Cowen, Philip S. Barnett, Emma Elliot, Patsy Coskeran, Pierre M.G. Bouloux

    Research output: Contribution to journalArticle

    12 Scopus citations

    Abstract

    Adult growth hormone deficient patients are known to exhibit reduced sweating and their ability to thermoregulate is diminished. Treatment of these patients with recombinant human growth hormone (r-hGH) is claimed to reverse these abnormalities. We have investigated this claim, as well as the mechanism underlying these altered sweating responses in GH-deficient patients as part of a placebo-controlled study on the effects of 6-12 months r-hGH therapy. Skin biopsies were obtained from these subjects and changes in morphology and innervation parameters for the eccrine sweat glands were examined. These included histochemistry for acetylcholinesterase (AChE) and immunohistochemistry for the neuropeptide vasoactive intestinal polypeptide (VIP) and for PGP9.5, a general neuronal marker. Sweat gland acinar size and periacinar innervation were measured by computerised image analysis. The patients underwent pilocarpine iontophoresis sweat rate tests and their serum insulin-like growth factor 1 (IGF-1) levels were assessed. Since active acromegaly involves excess GH secretion and hyperhidrosis, skin biopsies and sweat tests were also carried out on a group of these patients, as well as on control subjects. We have demonstrated a sweating defect in adult GH-deficiency which is accompanied by a reduction in AChE and VIP levels in the nerve supply to sweat glands. Following r-hGH therapy, an increase in AChE and VIP staining is seen in the sudomotor nerves accompanied by restoration of sweat rates and serum IGF-1 levels. Hence, normalization of sweat gland function includes recovery of sudomotor synapse constituents. A trophic effect of GH on sweat gland epithelium and/or on the associated nerves is proposed, supported by the observation that in acromegaly the size of sweat gland acini and the density of innervation to the sweat glands was greater than in controls.

    Original languageEnglish (US)
    Pages (from-to)100-109
    Number of pages10
    JournalAutonomic Neuroscience: Basic and Clinical
    Volume89
    Issue number1-2
    DOIs
    StatePublished - Jun 20 2001

    Keywords

    • Acromegaly
    • Adult growth hormone deficiency
    • Autonomic nerves
    • Growth hormone
    • Insulin-like growth factor
    • Neuronal plasticity
    • Sweat gland innervation
    • Sweating
    • Sympathetic nerves
    • Vasoactive intestinal polypeptide

    ASJC Scopus subject areas

    • Endocrine and Autonomic Systems
    • Clinical Neurology
    • Cellular and Molecular Neuroscience

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