Biomarker detection of rhGH doping: an excretion study

Area of Science:

• Sports Science
• Biochemistry
• Anti-Doping

Background:

• The GH-2000 project proposed an indirect method for detecting exogenous growth hormone (GH) using GH-dependent markers.
• Insulin-like growth factor-I (IGF-I) and Type III pro-collagen (P-III-P) levels increase in a dose-dependent manner following GH administration.

Purpose of the Study:

• To validate the biomarker-based approach for detecting recombinant human growth hormone (rhGH) doping in athletes.
• To assess the efficacy of IGF-I, IGF-BP3, and P-III-P as biomarkers for rhGH detection in anti-doping programs.

Main Methods:

• An administration study involving 25 Chinese male volunteers receiving rhGH at 0.1 IU/kg/day for 14 days.
• Serum concentrations of IGF-I, IGF-BP3, and P-III-P were measured throughout the study period.
• Statistical analysis using SPSS was performed to establish a discriminant formula.

Main Results:

• Serum IGF-I levels increased significantly in the rhGH group compared to baseline from day 4 to day 16.
• P-III-P levels showed a delayed but sustained increase, remaining elevated from day 4 to day 28.
• A valid discriminant formula was established, confirming the reliability of the biomarker methodology.

Conclusions:

• The biomarker methodology using IGF-I and P-III-P is valid and universally applicable for detecting rhGH doping.
• This indirect detection assay provides a robust tool for modern anti-doping strategies.
• The study supports the implementation of this biomarker approach in sports anti-doping programs.