Competitive enzyme immunoassay for bovine growth hormone

Area of Science:

• Biochemistry
• Endocrinology
• Animal Science

Background:

• Bovine growth hormone (bGH) plays a crucial role in animal growth and metabolism.
• Accurate quantification of bGH is essential for research and agricultural applications.
• Existing methods like radioimmunoassay (RIA) involve radioactive reagents, posing safety and disposal challenges.

Purpose of the Study:

• To develop and validate a non-radioactive enzyme immunoassay (EIA) for the accurate detection of bovine growth hormone (bGH).
• To establish a reliable and safe alternative to radioimmunoassay (RIA) for bGH measurement in bovine pituitary cell cultures.

Main Methods:

• Indirect competitive immunoassay utilizing a 96-well microplate format.
• Incubation steps involved bGH standards/samples, rabbit anti-bGH antibody, biotin-labeled bGH, and streptavidin-peroxidase conjugate.
• Enzyme activity was measured via substrate addition and subsequent absorbance reading at 450 nm using an ELISA reader.

Main Results:

• The developed EIA demonstrated good precision with intra-assay coefficients of variation ranging from 4.13% to 7.59% and inter-assay variations from 3.71% to 8.27%.
• A high correlation (r=0.9701) was observed between the EIA and radioimmunoassay (RIA) results, with the regression equation y(RIA) = 1.9986 x (EIA) - 1.3921.
• The assay effectively measured bGH in bovine pituitary cell culture medium.

Conclusions:

• The developed enzyme immunoassay (EIA) is a reliable and sensitive method for quantifying bovine growth hormone (bGH).
• This EIA serves as a safe and practical alternative to radioimmunoassay (RIA), eliminating the need for radioactive reagents and specialized counting equipment.
• The assay is suitable for measuring bGH in cell culture supernatants, facilitating endocrinological research.