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Thyroid hormone binds to human corpus luteum.

S Bhattacharya1, J Banerjee, M Jamaluddin

  • 1School of Life Science, Department of Zoology, Visva-Bharati University, West Bengal, India.

Experientia
|December 1, 1988
PubMed
Summary

Thyroid hormone (T3) specifically binds to human corpus luteal nuclei, indicating a direct effect on the corpus luteum. This discovery reveals a novel mechanism in reproductive endocrinology.

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Area of Science:

  • Endocrinology
  • Reproductive Biology
  • Molecular Biology

Background:

  • Thyroid hormones play crucial roles in metabolism and development.
  • The corpus luteum is essential for female reproduction, regulating the menstrual cycle and early pregnancy.
  • The presence and function of thyroid hormone receptors in the corpus luteum are not well understood.

Purpose of the Study:

  • To investigate the presence and characteristics of thyroid hormone binding in human corpus luteal nuclei.
  • To determine if 3,5,3'-triiodo-L-thyronine (T3) binding is specific and saturable.
  • To explore the potential direct impact of thyroid hormones on corpus luteum function.

Main Methods:

  • Utilized an in vitro thyroid hormone binding assay with human corpus luteal nuclei preparations.
  • Employed 40% polyethylene glycol for efficient separation of bound and free hormone.
  • Conducted competitive binding studies using hormone analogues to assess specificity.
  • Quantified binding affinity (Kd) and maximum binding capacity (Bmax) under standardized conditions (pH 8.6, 37°C, 2-h incubation).

Main Results:

  • Detected high-affinity, low-capacity, and specific binding of 3,5,3'-triiodo-L-thyronine (T3) in human corpus luteal nuclei.
  • Binding was saturable, with a dissociation constant (Kd) of 4.94 x 10(-10) M and a maximum binding capacity of 1.70 pmol/mg DNA.
  • Competitive binding assays confirmed the hormone-specific nature of T3 binding to corpus luteal nuclei.

Conclusions:

  • Demonstrated the existence of specific thyroid hormone (T3) binding sites within human corpus luteal nuclei.
  • Provided evidence for a direct effect of thyroid hormone on the human corpus luteum.
  • Suggests a potential regulatory role of thyroid hormones in corpus luteum function and female reproductive health.

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