Abstract
Human growth hormone (GH), a 191 amino acid proteohormone, is abused in sports. Although there were only few positive test result reported from accredited antidoping laboratories until today, there is enough evidence to assume its wider abuse for performance enhancement: Former athletes have confessed to have abused GH, and ampoules containing recombinant GH have been found in the possession of active athletes or trainers by police and customs officials. For a long time, the detection of GH abuse by testing laboratories was not possible. The main reason why it was difficult to develop an appropriate test was the identity in amino acid sequence between pituitary and recombinant GH, making a distinction by means of physicochemical characterization impossible. Over the last decade, two approaches have been followed to detect abuse of GH. One approach, based on characterization of changes in concentrations of proteins which are produced in response to GH (the “marker approach”), is described elsewhere in this book. Here, we are describing an alternative strategy, called the “differential immunoassay” or “isoform approach.” Pituitary GH consists of a spectrum of molecular isoforms, whereas recombinant hGH preparations are made of the 22 kD isoform only. After injection, secretion of the pituitary-derived isoforms is blunted by negative feedback, and the 22 kD isoform becomes predominant in circulation. Specific immunoassays employing monoclonal antibodies with a preference for the one or the other isoform can be used to detect these changes. Two sets of specific assays have been validated for this purpose and are currently implemented in antidoping laboratories. Future directions for developing the isoform approach include the specific measurement of the 20 kD isoform, which is reduced after application of 22 kD GH, and also the identification of GH isoforms by methods other than immunoassays, including plasmon surface resonance, two dimensional gel electrophoresis, and mass spectrometry.
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Bidlingmaier, M., Wu, Z., Strasburger, C.J. (2011). Problems with Growth Hormone Doping in Sports: Isoform Methods. In: Ghigo, E., Lanfranco, F., Strasburger, C. (eds) Hormone Use and Abuse by Athletes. Endocrine Updates, vol 29. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-7014-5_14
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