Abstract
This study describes the development and validation of competitive antigen capture enzyme-linked immunosorbent assay (ELISA) for growth hormone (GH) of the catfish, Clarias batrachus. Isolated GH was characterized first through bioassay, amino acid sequencing, immunoblotting and immunocytochemistry, and then used to raise antibody to develop ELISA. The lowest detection limit of the assay system was 0.17 ng ml−1, and the standard curve had an ED50 value of 0.35 ng ml−1. Repeated determination of GH in a plasma pool exhibited intra- and interassay co-efficient of variation of 8.1% and 7.09% (n=5), respectively. Dose–response inhibition curves resulting from dilutions of plasma and pituitary homogenate of C. batrachus were parallel to the standard curve, while such parallelism in the case of Cyprinus carpio and H. fossilis was absent revealing no cross reaction of them in the present ELISA. In vivo effects of sGnRH, testosterone, 5-HT and morphine on plasma GH were also examined to validate the ELISA physiologically. sGnRH, testosterone and morphine increased, while 5-HT decreased GH level in a dose-dependent manner.
Similar content being viewed by others
References
Berghman LR, Lescroart O, Roelants I, Ollevier F, Kuhn ER, Verhaert PD, Loof AD, Van Leuven F, Vandesande F (1996) One step immunoaffinity purification and partial characterization of hypophyseal growth hormone from African catfish, Clarias gariepinus (Burchell). Comp Biochem Physiol 113B(4):773–780
Blaise O, Le Bail PY, Weil C (1995) Lack of gonadotropin action on in vitro and in vivo growth hormone release in rainbow trout, Onchorynchus mykiss. Comp Biochem Physiol 110C:133–141
Drennon K, Moriyama S, Kawauchi H, Small B, Silverstein J, Parhar I, Shepard B (2003) Development of an enzyme-linked immunosorbent assay for the measurement of plasma growth hormone (GH) levels in channel catfish (Ictalurus punctatus): assessment of environmental salinity and GH secretogogues on plasma GH levels. Gen Comp Endocrinol 133:314–322
Huggard D, Khakoo Z, Kassam G, Habibi HR (1996) Effect of testosterone on growth hormone gene expression in the goldfish pituitary. Can J Physiol 74:1039–1046
Lescroart O, Roelants I, Mikolajczyk T, Bosma PT, Schulz RW, Kuhn ER, Ollevier F (1996) A radioimmunoassay for African catfish growth hormone: validation and effects of substances modulating the release of growth hormone. Gen Comp Endocrinol 104:147–155
Nasaruddin K, Majumdar KC (2002) Clarias batrachus growth hormone mRNA sequence, complete CDS. Gene Bank Submission AF 416485
Peng C, Peter RE (1997) Neuroendocrine regulation of growth hormone secretion and growth in fish. Zool Stud 36(2):79–89
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lal, B., Singh, A.K. Immunological and physiological validation of enzyme-linked immunosorbent assay for growth hormone of the Asian catfish, Clarias batrachus . Fish Physiol Biochem 31, 289–293 (2005). https://doi.org/10.1007/s10695-006-0038-x
Issue Date:
DOI: https://doi.org/10.1007/s10695-006-0038-x