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Related Concept Videos

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Sperm Structure and Semen Composition

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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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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
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Fertilization01:38

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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Related Experiment Video

Updated: Nov 10, 2025

Medium-throughput Screening Assays for Assessment of Effects on Ca2+-Signaling and Acrosome Reaction in Human Sperm
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Sperm Cholesterol Content Modifies Sperm Function and TRPV1-Mediated Sperm Migration.

Luca De Toni1, Iva Sabovic2, Vincenzo De Filippis3

  • 1Unit of Andrology and Reproduction Medicine, Department of Medicine, University of Padova, 35128 Padova, Italy.

International Journal of Molecular Sciences
|April 3, 2021
PubMed
Summary

Membrane cholesterol regulates human sperm migration via TRPV1 channels. Lowering cholesterol enhances sperm movement in response to capsaicin, while increasing it inhibits migration, revealing a direct interaction mechanism.

Keywords:
cholesterol recognition amino acid consensus sequenceepicholesterolmolecular modelingsperm membranethermotaxis

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Area of Science:

  • Reproductive Biology
  • Molecular Physiology
  • Biophysics

Background:

  • Transient receptor potential channels-vanilloid receptor 1 (TRPV1) plays a role in sperm thermotaxis.
  • Membrane cholesterol (Chol) is a key regulator of ion channel function.
  • The specific role of membrane cholesterol in TRPV1-mediated human sperm migration remains unclear.

Purpose of the Study:

  • To investigate the impact of membrane cholesterol levels on TRPV1-mediated human sperm migration.
  • To elucidate the interaction between cholesterol and TRPV1 in regulating sperm function.

Main Methods:

  • Human semen samples were analyzed.
  • Sperm membrane cholesterol content was modulated using 2-hydroxypropyl-ß-cyclodextrin (CD) and cholesterol-cyclodextrin complexes (CD:Chol).
  • Sperm migration in response to capsaicin (CPS), a TRPV1 agonist, was assessed using Sperm Class Analyser, alongside calcium influx and acrosome reaction measurements. Computational molecular modeling (MM) was employed to study TRPV1-Chol interactions.

Main Results:

  • Modulating membrane cholesterol levels dose-dependently altered sperm migration in a capsaicin gradient.
  • Reduced cholesterol (via CD) increased sperm migration, while increased cholesterol (via CD:Chol) decreased it.
  • Molecular modeling confirmed direct interaction of cholesterol with a specific TRPV1 domain, a binding not observed with epicholesterol.

Conclusions:

  • Membrane cholesterol directly inhibits TRPV1-mediated human sperm migration by interacting with a specific receptor domain.
  • Cholesterol's influence on TRPV1 channel function is critical for regulating sperm motility and directional movement.
  • Targeting membrane cholesterol could be a novel strategy for modulating sperm function.