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Induced Pluripotent Stem Cells01:13

Induced Pluripotent Stem Cells

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Stem cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore...
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Induced Pluripotent Stem Cells01:06

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Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
Somatic...
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Induced Pluripotent Stem Cells01:13

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Spermatogenesis01:41

Spermatogenesis

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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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Spermatogenesis01:22

Spermatogenesis

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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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Somatic to iPS Cell Reprogramming01:29

Somatic to iPS Cell Reprogramming

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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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[Induced pluripotent stem cells in spermatogenesis: Progress in current studies].

Fang Fang, Ke Ni, Cheng-liang Xiong

    Zhonghua Nan Ke Xue = National Journal of Andrology
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    Human spermatogenesis research is limited, often relying on mouse models. In vitro models using induced pluripotent stem cells (iPSCs) offer insights into male infertility and potential treatments.

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    Area of Science:

    • Reproductive biology
    • Stem cell research
    • Human embryology

    Background:

    • Human spermatogenesis, the process of sperm formation, is not fully understood, particularly its initial stages.
    • Current research heavily relies on mouse models, limiting direct applicability to human reproductive biology.
    • Male infertility affects a significant portion of the population, highlighting the need for better understanding and treatment strategies.

    Purpose of the Study:

    • To review the current knowledge on generating germ cell-like cells from induced pluripotent stem cells (iPSCs) in vitro.
    • To discuss the potential of iPSCs in advancing the understanding of human male germ cell development.
    • To explore the therapeutic applications of iPSCs for treating male infertility.

    Main Methods:

    • Review of existing literature on in vitro spermatogenesis models.
    • Analysis of studies utilizing induced pluripotent stem cells (iPSCs) for germ cell generation.
    • Discussion of the implications of these findings for male reproductive health.

    Main Results:

    • Induced pluripotent stem cells (iPSCs) can be differentiated into cells resembling human germ cells in vitro.
    • These in vitro models provide a platform to study early human spermatogenesis.
    • The development of these models holds promise for understanding infertility mechanisms.

    Conclusions:

    • In vitro generation of germ cell-like cells from iPSCs is a promising avenue for studying human spermatogenesis.
    • This approach may offer novel insights into the causes and potential treatments for male infertility.
    • Further research is needed to fully translate these findings into clinical applications for male infertility management.