Human, bovine, and equine growth hormone antibodies in patients treated with human growth hormone.

This study investigated the immune response in patients with hypopituitarism – a condition where the pituitary gland doesn’t produce enough hormones – who were treated with human growth hormone (hGH). The researchers found that these patients developed antibodies not only against hGH, but also against bovine and equine growth hormones. The exact mechanism behind this response remains unclear.

Objective of the Research

• The research aimed to explore the immunological behavior in hypopituitary patients who were treated with human growth hormones (hGH). The specific focus was on the production of antibodies directed against the human, bovine, and equine growth hormones.

Methods Used in the Study

• The study used homologous and heterologous radioimmunoassays (RIAs) technology. This involved the use of labeled hormones for identification and analysis.
• Displacement experiments were also conducted to test the effectiveness of hormone competition.

Findings of the Research

• The findings revealed the presence of antibodies against hGH. Additionally, antibodies exhibiting anti-bovine growth hormone (bGH) and anti-equine growth hormone (eGH) activities were also detected.
• The displacement experiments showed that hGH was an effective competitor of labeled hGH whereas bGH and eGH were quite inefficient.
• The affinity constants of different antibodies found in human sera were similar to each other and to those detected after the immunization of rabbits.

Implications of the Research

• The results suggest that the antibodies against bGH and eGH appear to belong to a separate population from those that target the human hormone.
• The mechanism whereby hGH expresses determinants of other animal growth hormones remains unclear. However, the structural conservation of these molecules during evolution is likely to be a significant factor.

Conclusion

• This research provides critical insights into the immunological responses observed in hypopituitary patients treated with hGH. The discovery of antibodies against animal growth hormones in addition to human ones opens new possibilities for further research into therapeutic strategies, as well as the potential influences of evolutionary processes on hormonal structure and function.