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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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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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Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
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Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
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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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The accessory ducts involved in sperm maturation and transportation include the epididymides, vasa deferentia, ejaculatory ducts, and urethra. These ducts play a critical role in the maturation, storage, and transportation of sperm from the testes to the urethra, where it is then released during ejaculation.
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Epididymal macrophage senescence contributes to sperm motility decrease upon environmental stress.

Xin-Run Wang1,2, Hao Li1,2,3, Yong-Wei Xiong1,2

  • 1Department of Toxicology, Center for Big Data and Population Health of IHM, School of Public Health, Anhui Medical University, Hefei 230000, China.

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This summary is machine-generated.

Environmental toxins like lead, cadmium, and mercury harm sperm motility by causing aging in epididymal macrophages. Clearing these aged cells can help prevent male infertility caused by environmental stress.

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Area of Science:

  • Reproductive Biology
  • Immunology
  • Environmental Health

Background:

  • Male infertility is a growing public health concern, often linked to environmental factors.
  • The precise immunological mechanisms behind environmental stress-induced reductions in sperm motility are not fully understood.
  • Heavy metals such as lead, cadmium, and mercury are identified as significant contributors to decreased sperm motility.

Purpose of the Study:

  • To investigate the immunological pathway linking environmental stressors to reduced sperm motility.
  • To identify the role of epididymal macrophages in environmental stress-induced male infertility.
  • To explore potential therapeutic strategies targeting macrophage senescence.

Main Methods:

  • Experiments utilizing in vivo and in vitro models exposed to lead, cadmium, and mercury.
  • Analysis of macrophage senescence markers and Foxo3 expression in the epididymis.
  • Investigating the role of N6-methyladenosine modification of Foxo3 and FTO activity.
  • Evaluating the effects of Fto overexpression and S-adenosylhomocysteine supplementation.

Main Results:

  • Environmental stressors (lead, cadmium, mercury) significantly reduce sperm motility.
  • Environmental stress induces senescence in epididymal macrophages.
  • Clearing senescent macrophages alleviates stress-induced reductions in sperm motility.
  • Macrophage senescence is mediated by the downregulation of Foxo3 expression due to increased N6-methyladenosine levels and FTO inhibition.
  • Modulating FTO activity or S-adenosylhomocysteine levels can mitigate stress-induced macrophage senescence.

Conclusions:

  • Epididymal macrophage senescence is a key contributor to environmental stress-induced male infertility.
  • Targeting and clearing senescent epididymal macrophages presents a novel strategy for preventing male infertility.
  • Understanding the Foxo3-N6-methyladenosine-FTO pathway offers insights into male reproductive health.