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Development of Bovine Specific Leptin Radioimmunoassay and Relationship of Plasma Leptin with Vitamin A and Age of Wagyu

  • Yang, S.H. (National Institute of Animal Science) ;
  • Kawachi, H. (Graduate School of Agriculture, Kyoto University) ;
  • Khan, M.A. (Department of Agricultural Biotechnology, Seoul National University) ;
  • Lee, S.Y. (Department of Agricultural Biotechnology, Seoul National University) ;
  • Kim, H.S. (National Institute of Animal Science) ;
  • Ha, Jong K. (Department of Agricultural Biotechnology, Seoul National University) ;
  • Lee, W.S. (National Institute of Animal Science) ;
  • Lee, H.J. (National Institute of Animal Science) ;
  • Ki, K.S. (National Institute of Animal Science) ;
  • Kim, S.B. (National Institute of Animal Science) ;
  • Sakaguchi, S. (GIFU Prefectural Livestock Research Institute) ;
  • Maruyama, S. (GIFU Prefectural Livestock Research Institute) ;
  • Yano, H. (Graduate School of Agriculture, Kyoto University)
  • Received : 2008.06.03
  • Accepted : 2008.07.18
  • Published : 2008.09.01

Abstract

Leptin is produced by adipocytes and its role in the regulation of lipid metabolism, feed intake, productive and reproductive performance of domestic animal species has been greatly stressed and extensively investigated in recent years. This study was conducted to develop a radioimmunoassay (RIA) for the estimation of plasma bovine leptin and to determine plasma leptin concentration in fattening Japanese Black cattle (Wagyu) and its crossbreds at commercial farms. Relationships of plasma leptin with plasma vitamin A and age of crossbred cattle were also determined. Recombinant bovine leptin (rbleptin) was produced by the E. coli overexpressed leptin as a GST (glutathione S-transferase)-fusion protein. Then antiserum against bovine leptin was obtained by its immunization in rabbits. Using this antiserum, a bovine specific RIA was developed and plasma leptin level was determined in 120 crossbred fattening cattle (WagyuHolstein, 50:50) at commercial farms. The plasma leptin level increased with the age of cattle and its level was greater in the crossbred heifers than in the steers. Plasma vitamin A level was negatively correlated with plasma leptin level in crossbred heifers and steers. This relationship was stronger in heifers than in steers. Plasma leptin was gradually increased with advancing age in fattening Wagyu cattle. In conclusion, development of a bovine specific RIA to estimate plasma leptin will contribute to better understanding of the role of leptin in cattle.

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