Analysis of urinary human growth hormone (hGH) using hydrogel nanoparticles and isoform differential immunoassays after short recombinant hGH treatment: Preliminary results

Jaume Bosch, Alessandra Luchini, Simona Pichini, Davide Tamburro, Claudia Fredolini, Lance Liotta, Emanuel Petricoin, Roberta Pacifici, Francesco Facchiano, Jordi Segura, Enrico Garaci, Ricardo Gutiérrez-Gallego

Research output: Contribution to journalArticlepeer-review

Abstract

Successful application clinical-grade human growth hormone (hGH) immunoassays to the discovery of illegal doping cases has been rare. Indeed, the preferred biological matrix in doping control is urine, where the estimated baseline concentration of hGH falls well below the linear range and sensitivity threshold of all commercially available immunoassays, including hGH isoform differential immunoassays which can discriminate pituitary endogenous hGH from recombinant hGH. We employed hydrogel nanoparticles as a pre-processing step that concentrate urinary hGH into the linear range of isoform differential immunoassays.We explored the characteristics of immunoassays in urine spiked with both phGH or rhGH, after pre-treatment with the nanoparticles. Subsequently, pre-treatment was applied to urine obtained from 3 healthy volunteers administered during three days with daily subcutaneous injections of 0.026mg/kg/day rhGH, Genotonorm®.Linearity between both rhGH and phGH concentrations in urine measured by a chemoluminescent assay (Immulite) and in the particle eluate was evident for differential immunoassays (R square higher than 0.999). In case of treated individuals the recombinant/pituitary concentration ratios remained above the established World Anti-Doping Agency (WADA) criterion for hGH misuse up to 24. h after the last administration dose, using both assays for volunteer 1 and 2 while in case of volunteer 3 results were inconclusive.The use of nanoparticles appears to open the possibility of assessing rhGH misuse in urine.

Original languageEnglish
Pages (from-to)194-197
Number of pages4
JournalJournal of Pharmaceutical and Biomedical Analysis
Volume85
DOIs
Publication statusPublished - Nov 2013

Keywords

  • Differential immunoassays
  • Hydrogel nanoparticles
  • Pituitary growth hormone
  • Recombinant growth hormone

ASJC Scopus subject areas

  • Analytical Chemistry
  • Drug Discovery
  • Pharmaceutical Science
  • Spectroscopy
  • Clinical Biochemistry

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