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Administration study of recombinant human relaxin-2 in horse for doping control purpose.
Kwok, Wai Him; Choi, Timmy L S; Leung, Gary N W; Wong, April S Y; Yue, Samuel K; Wan, Terence S M; Ho, Emmie N M.
Afiliação
  • Kwok WH; Racing Laboratory, The Hong Kong Jockey Club, Sha Tin Racecourse, Sha Tin, N.T., Hong Kong, China.
  • Choi TLS; Racing Laboratory, The Hong Kong Jockey Club, Sha Tin Racecourse, Sha Tin, N.T., Hong Kong, China.
  • Leung GNW; Racing Laboratory, The Hong Kong Jockey Club, Sha Tin Racecourse, Sha Tin, N.T., Hong Kong, China.
  • Wong ASY; Racing Laboratory, The Hong Kong Jockey Club, Sha Tin Racecourse, Sha Tin, N.T., Hong Kong, China.
  • Yue SK; Minnesota Pain Center, St Paul, MN, USA.
  • Wan TSM; Racing Laboratory, The Hong Kong Jockey Club, Sha Tin Racecourse, Sha Tin, N.T., Hong Kong, China.
  • Ho ENM; Racing Laboratory, The Hong Kong Jockey Club, Sha Tin Racecourse, Sha Tin, N.T., Hong Kong, China.
Drug Test Anal ; 12(3): 361-370, 2020 Mar.
Article em En | MEDLINE | ID: mdl-31726484
The insulin-like peptide relaxin (RLX), an endogenous peptide hormone produced in human for pregnancy and reproduction, is also known to exert a range of physiological and pathological effects. Its use is banned in human sports, horseracing, and equestrian competitions due to its potential performance enhancing effect through vasodilation resulting in the increase of blood and oxygen supplies to muscles. Little is known about the biotransformation and elimination of RLX in horses. This paper describes an administration study of rhRLX-2 and its elimination in horses, and the development of sensitive methods for the detection and confirmation of rhRLX-2 in both horse plasma and urine by nano-liquid chromatography/high resolution mass spectrometry (nano-LC/HRMS) after immunoaffinity extraction with the objective of controlling the abuse of rhRLX-2 in horses. The limits of detection in plasma and urine are 2 pg/mL and 5 pg/mL, respectively. Two thoroughbred geldings were each administered one dose of 10 mg rhRLX-2 subcutaneously daily for 3 consecutive days. The rhRLX-2 could be detected and confirmed in the plasma and urine samples collected 105 h and 80 h, respectively, after the last dose of administration. For doping control purposes, rhRLX-2 ELISA could be used as a screening test to identify potential positive samples for further investigation using the nano-LC/HRMS methods.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Relaxina / Dopagem Esportivo Limite: Animals / Humans / Male Idioma: En Revista: Drug Test Anal Assunto da revista: FARMACOLOGIA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: China

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Relaxina / Dopagem Esportivo Limite: Animals / Humans / Male Idioma: En Revista: Drug Test Anal Assunto da revista: FARMACOLOGIA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: China