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Spermatogenesis01:41

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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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Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously...
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Embryonic stem (ES) cells were first discovered in mice in 1981 by Martin Evans. In 1998, James Thomson identified a method to isolate embryonic stem cells from humans. Human embryonic stem cells (hESCs) are obtained from 3-5 day old embryos that remain unused after an in vitro fertilization procedure.
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Spermatogonial stem cells and in vitro spermatogenesis.

Takehiko Ogawa1

  • 1Department of Urology Yokohama City University Graduate School of Medicine 3-9 Fukuura, Kanazawa-ku 236-0004 Yokohama Japan.

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Spermatogonial stem cells (SSCs) are dynamic, not dormant, and their colonies change size. New culture and in vitro systems can now produce functional sperm from SSCs, advancing reproductive medicine.

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Area of Science:

  • Reproductive Biology
  • Cell Biology
  • Developmental Biology

Background:

  • Spermatogonial stem cells (SSCs) are crucial for continuous sperm production throughout life.
  • Previously, SSCs were thought to be largely dormant and static within their niche.
  • Recent research reveals a more dynamic nature of SSCs within the seminiferous tubules.

Purpose of the Study:

  • To clarify the behavior and characteristics of spermatogonial stem cells.
  • To investigate the dynamic nature of SSC colonies.
  • To develop methods for culturing SSCs and achieving in vitro spermatogenesis.

Main Methods:

  • Observation of SSC behavior in seminiferous tubules.
  • Development of a culture method for SSCs.
  • Establishment of an in vitro system for spermatogenesis.

Main Results:

  • SSCs exhibit dynamic behavior and their colony sizes can change rapidly.
  • SSCs possess stable yet fragile characteristics when cultured.
  • An in vitro system successfully produced functional sperm from SSCs.

Conclusions:

  • Spermatogonial stem cells are more dynamic than previously understood.
  • Advances in SSC culture and in vitro spermatogenesis hold promise for reproductive medicine.
  • These findings contribute to a better understanding of male fertility and potential therapeutic strategies.