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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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Seminal Plasma: Relevant for Fertility?

Heriberto Rodriguez-Martinez1, Emilio A Martinez2, Juan J Calvete3

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International Journal of Molecular Sciences
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Seminal plasma (SP) plays crucial roles in sperm function and fertility. This review examines SP

Keywords:
accessory sexual glandsantioxidantscytokinesejaculateepididymisfemale genital tractfertilitygene expressionhumanlivestockproteomeseminal fluid

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Area of Science:

  • Reproductive Biology
  • Biochemistry
  • Genetics

Background:

  • Seminal plasma (SP) is a complex fluid containing ions, hormones, proteins, and nucleic acids.
  • SP influences sperm function and prepares the female reproductive tract for pregnancy, thus modulating fertility.
  • While SP-free sperm are fertile, SP's in vivo and in vitro roles differ significantly.

Purpose of the Study:

  • To critically review the reproductive roles of SP components in vivo and in assisted reproduction.
  • To explore SP's potential as diagnostic biomarkers and additives for reproductive strategies.
  • To reconcile the balance between SP molecular concentration and its effects on fertility.

Main Methods:

  • Literature review of seminal plasma functions.
  • Analysis of existing research on SP in natural and assisted reproduction.
  • Inclusion of original research findings from model animal species.

Main Results:

  • SP components are vital for sperm function and female reproductive tract preparation.
  • Differences exist between SP's in vivo roles and its effects in artificial reproduction techniques.
  • SP components show potential as biomarkers and additives for improving fertility outcomes.

Conclusions:

  • Seminal plasma is essential for optimizing fertility, with distinct roles in natural and assisted reproduction.
  • Understanding SP composition and function can refine reproductive biotechnologies.
  • Further research is needed to harness SP's full potential in human and livestock fertility.