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Related Concept Videos

Types of Toxins01:36

Types of Toxins

Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Toxicity Testing in Animals01:23

Toxicity Testing in Animals

Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
Spermatogenesis01:41

Spermatogenesis

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 reproductive...
Toxic Reactions: Overview01:26

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Infertility in Males01:23

Infertility in Males

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...
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...

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Related Experiment Video

Updated: May 29, 2026

Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants
07:08

Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants

Published on: March 6, 2018

Environmental toxicants and male reproductive function.

C Yan Cheng1, Elissa W P Wong, Pearl P Y Lie

  • 1Center for Biomedical Research; The Population Council; New York, NY USA.

Spermatogenesis
|August 26, 2011
PubMed
Summary

Environmental toxicants like cadmium and BPA disrupt male reproductive function by damaging the blood-testis barrier (BTB). MAPK pathways are implicated, suggesting potential therapeutic targets for managing toxicant-induced injury.

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Transgenic Rodent Assay for Quantifying Male Germ Cell Mutant Frequency
14:45

Transgenic Rodent Assay for Quantifying Male Germ Cell Mutant Frequency

Published on: August 6, 2014

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Last Updated: May 29, 2026

Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants
07:08

Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants

Published on: March 6, 2018

Transgenic Rodent Assay for Quantifying Male Germ Cell Mutant Frequency
14:45

Transgenic Rodent Assay for Quantifying Male Germ Cell Mutant Frequency

Published on: August 6, 2014

Area of Science:

  • Endocrinology
  • Toxicology
  • Reproductive Biology

Background:

  • Environmental toxicants, including cadmium and bisphenol A (BPA), are known endocrine disruptors.
  • Exposure to BPA during development can impair male reproductive function by affecting the blood-testis barrier (BTB) integrity in rats.

Purpose of the Study:

  • To investigate the mechanisms by which environmental toxicants like cadmium and BPA disrupt male reproductive function.
  • To explore the role of mitogen-activated protein kinases (MAPK) in toxicant-induced testicular dysfunction.
  • To identify potential therapeutic strategies for mitigating the effects of these toxicants.

Main Methods:

  • The study examined the effects of BPA and cadmium on BTB integrity in immature rats.
  • Investigated the involvement of specific signaling pathways, including extracellular signal-regulated kinases 1/2 (Erk1/2) and other MAPKs.
  • Utilized MAPK inhibitors to assess their protective effects against toxicant-induced testicular injury.

Main Results:

  • BPA exposure disrupted BTB integrity by affecting gap junction function and activating Erk1/2 signaling, leading to increased protein endocytosis.
  • Cadmium disrupted testicular function by affecting the occludin/ZO-1/FAK complex, leading to BTB disruption and redistribution of proteins at the Sertoli-Sertoli cell interface.
  • MAPK activation was identified as a common pathway for both toxicants, affecting actin dynamics and causing BTB dysfunction and premature germ cell release.

Conclusions:

  • A common MAPK-based signaling pathway involving polarity proteins and actin regulators is likely shared by different toxicants that induce male reproductive dysfunction.
  • MAPK inhibitors show promise in blocking or delaying cadmium-induced testicular injury, suggesting potential therapeutic applications.
  • Targeting specific MAPKs could offer a strategy to manage toxicant-induced male reproductive illnesses and protect exposed workers.