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Related Experiment Videos

Thyrotrophin-releasing hormone in human ejaculate.

H Rui1, B S Welinder, K Purvis

  • 1Institute of Pathology, National Hospital, Oslo, Norway.

The Journal of Endocrinology
|August 1, 1987
PubMed
Summary
This summary is machine-generated.

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Thyrotropin-releasing hormone (TRH) in human ejaculate exists in forms larger than native peptide. Ejaculation may stimulate TRH appearance, suggesting a role in male reproductive function.

Area of Science:

  • Reproductive Endocrinology
  • Biochemistry

Background:

  • Thyrotropin-releasing hormone (TRH) is a peptide hormone primarily known for its role in the hypothalamic-pituitary-thyroid axis.
  • The presence and function of TRH in human ejaculate are not fully understood, prompting investigation into its local role in male reproduction.

Purpose of the Study:

  • To characterize the molecular forms of immunoassayable TRH in human ejaculate.
  • To investigate the stability and potential degradation products of TRH in ejaculates.
  • To explore the origin and contribution of different seminal fractions to TRH levels.

Main Methods:

  • Gel column chromatography to assess molecular weight.
  • Reverse-phase high-performance liquid chromatography (HPLC) for peptide separation and identification.

Related Experiment Videos

  • Incubation of ejaculates to study TRH stability over time.
  • Analysis of split ejaculates and seminal vesicle secretions.

    • Main Results:

    • Immunoassayable TRH in ejaculate initially appears as a high molecular weight form, but co-elutes with standard TRH on HPLC.
    • Incubation leads to an increase in total TRH, with a shift towards more hydrophobic, potentially degraded forms.
    • TRH activity is concentrated in later fractions of split ejaculates, but seminal vesicle secretions show undetectable levels, suggesting ejaculation is a stimulus.

    Conclusions:

    • Human ejaculates contain TRH in various molecular forms, including native peptide and larger precursors or degradation products.
    • TRH undergoes changes in ejaculate, potentially through proteolytic degradation, and its presence is linked to the ejaculation process rather than solely seminal vesicle secretion.
    • These findings support a localized role for TRH in male reproductive function.