Treatment of growth hormone-deficient adults with recombinant human growth hormone increases the concentration of growth hormone in the cerebrospinal fluid and affects neurotransmitters

Neuroendocrinology
J O JohanssonB A Bengtsson

Abstract

In a double-blind, placebo-controlled trial, the effects of recombinant human growth hormone were studied on cerebrospinal fluid concentrations of growth hormone, insulin-like growth factor 1 (IGF-1), insulin-like growth factor binding protein-3 (IGFBP-3), monoamine metabolites, neuropeptides and endogenous opioid peptides. Twenty patients, 10 patients in each of 2 groups, with adult-onset, growth hormone deficiency were treated for 1 month with recombinant human growth hormone (0.25 U/kg/week) or placebo. All the patients received the appropriate thyroid, adrenal and gonadal hormone replacement. In cerebrospinal fluid, the mean concentration of growth hormone increased from 13.3 +/- 4.4 to 149.3 +/- 22.2 muU/l (p = 0.002), during recombinant human growth hormone treatment. The cerebrospinal fluid IGF-I concentration increased from 0.67 +/- 0.04 to 0.99 +/- 0.10 micrograms/l (p = 0.005) and the IGFBP-3 concentration rose from 13.4 +/- 1.25 to 17.5 +/- 1.83 micrograms/l (p = 0.002). The dopamine metabolite homovanillic acid decreased from 282.1 +/- 36.0 to 234.3 +/- 26.5 nmol/l (p = 0.02) and the vasoactive intestinal peptide decreased from 4.1 +/- 0.6 to 3.7 +/- 0.4 pmol/l (p = 0.03). Cerebrospinal fluid immunoreactive beta-end...Continue Reading

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