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Related Experiment Videos

Effect of actinomycin D and cycloheximide on human sperm function

R K Naz1

  • 1Department of Obstetrics and Gynecology, Medical College of Ohio, Toledo 43614-5809, USA. RNAZ@GEMINI.MCO.EDU

Archives of Andrology
|September 8, 1998
PubMed
Summary

Human sperm exhibit transcriptional and translational activities during capacitation. Inhibiting protein synthesis with cycloheximide reduced sperm function, while blocking transcription with actinomycin D increased it.

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Area of Science:

  • Reproductive Biology
  • Molecular Biology
  • Sperm Physiology

Background:

  • Human sperm were traditionally considered transcriptionally and translationally inert.
  • Understanding sperm cell activity during capacitation is crucial for reproductive science.

Purpose of the Study:

  • To investigate potential transcriptional and translational activities in human sperm during capacitation and acrosome reaction.
  • To determine the impact of inhibiting transcription and translation on human sperm function.

Main Methods:

  • Examined the effects of actinomycin D (transcription inhibitor) and cycloheximide (translation inhibitor) on human spermatozoal function.
  • Assessed the human sperm penetration of zona-free hamster oocytes assay (SPA) for penetration rates.
  • Incorporated [35(S)]methionine to detect de novo protein synthesis in human sperm.

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Main Results:

  • Actinomycin D significantly increased acrosome reaction and penetration rates.
  • Cycloheximide decreased acrosome reaction and penetration rates.
  • Protein synthesis was completely blocked by actinomycin D and slightly reduced by cycloheximide, with proteins synthesized in sperm head and midpiece.

Conclusions:

  • Human sperm possess transcriptional and translational capabilities, particularly in the head and midpiece regions.
  • These activities appear to play a role in sperm capacitation and the acrosome reaction.
  • Findings challenge the long-held view of sperm transcriptional and translational quiescence.