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Am J Mens Health. 2017 Nov;11(6):1752-1757. doi: 10.1177/1557988317718662. Epub 2017 Aug 22.

Growth Hormone Secretagogue Treatment in Hypogonadal Men Raises Serum Insulin-Like Growth Factor-1 Levels.

Author information

1
1 Baylor College of Medicine, Houston, TX, USA.
2
2 Center for Reproductive Medicine, Baylor College of Medicine, Houston, TX, USA.
3
3 Scott Department of Urology, Baylor College of Medicine, Houston, TX, USA.
4
4 University of Illinois at Chicago College of Medicine, Chicago, IL, USA.
5
5 The Brady Urological Institut, John's Hopkins Bayview Medical Center Baltimore, MD, USA.
6
6 University of Oklahoma College of Medicine, Department of Urology, Oklahoma City, OK, USA.

Abstract

Realizing the reported misuse of human growth hormone (GH), investigation of a safe alternative mechanism for increasing endogenous GH is needed. Several GH secretagogues are available, including GH-releasing peptides (GHRPs) GHRP-2 and GHRP-6, and the GH-releasing hormone analog, sermorelin (SERM). Insulin-like growth factor 1 (IGF-1) serves as a surrogate marker for GH. Here, the effect of GHRP/SERM therapy on IGF-1 levels is evaluated. A retrospective review of medical records was performed for 105 men on testosterone (T) therapy seeking increases in lean body mass and fat loss who were prescribed 100 mcg of GHRP-6, GHRP-2, and SERM three times daily. Compliance with therapy was assessed, and 14 men met strict inclusion criteria. Serum hormone levels of IGF-1, T, free T (FT), estradiol (E), luteinizing hormone (LH), and follicle-stimulating hormone (FSH) were evaluated. Mean (SD) age of the cohort was 33.2 (2.9) years, and baseline IGF-1 level was 159.5 (26.7) ng/mL. Mean (SD) duration of continuous GHRP/SERM treatment was 134 (88) days. Mean posttreatment IGF-1 level was 239.0 (54.6) ng/mL ( p < .0001). Three of the 14 men were on an aromatase inhibitor and/or tamoxifen prior to treatment and another 4 men were coadministered an aromatase inhibitor and/or tamoxifen during treatment. Inhibition of E production or estrogen receptor blockade resulted in smaller increases in IGF-1 levels. GHRP/SERM therapy increases serum IGF-1 levels with strict compliance to thrice-daily dosing. The results suggest that combination therapy may be beneficial in men with wasting conditions that can improve with increased GH secretion.

KEYWORDS:

IGF-1 levels; growth hormone; growth hormone secretagogue; growth hormone–releasing peptides; hypogonadism

PMID:
28830317
PMCID:
PMC5675260
DOI:
10.1177/1557988317718662
[Indexed for MEDLINE]
Free PMC Article

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