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Related Concept Videos

Abnormal Proliferation02:23

Abnormal Proliferation

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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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Related Experiment Video

Updated: Apr 26, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Cadmium Impairs p53 Activity in HepG2 Cells.

C Urani1, P Melchioretto1, M Fabbri2

  • 1Department of Earth and Environmental Sciences, University of Milano Bicocca, piazza della Scienza 1, 20126 Milan, Italy.

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Cadmium exposure impairs the p53 tumor suppressor pathway by upregulating miR-372, which inhibits p21 activation, leading to cell proliferation and resistance to apoptosis. This molecular insight into cadmium toxicity is crucial for understanding its health risks.

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Area of Science:

  • Environmental Toxicology
  • Molecular Biology
  • Cell Biology

Background:

  • Cadmium (Cd) is an environmental contaminant found in food, water, and cigarette smoke.
  • Cd exposure is linked to health issues, necessitating research into its cellular and molecular effects.
  • Understanding Cd's impact on apoptosis resistance is critical.

Purpose of the Study:

  • To investigate the molecular mechanisms of p53 impairment by cadmium at the gene and protein levels.
  • To elucidate how cadmium exposure leads to resistance to apoptosis.
  • To analyze the role of specific microRNAs in cadmium-induced cellular changes.

Main Methods:

  • Utilized a human hepatoma cell line (HepG2) for cadmium exposure experiments.
  • Assessed p53 gene and protein levels, nuclear translocation, and p21(Cip1/WAF-1) activation.
  • Performed microRNA (miRNA) analysis to identify changes in miRNA expression.

Main Results:

  • Cadmium exposure did not induce cell cycle arrest or regulate p53 at the gene or protein level in HepG2 cells.
  • p53 correctly translocated to the nucleus, but its downstream target p21(Cip1/WAF-1) was not activated at high Cd concentrations.
  • Upregulation of miR-372 was observed, an miRNA known to inhibit p21(Cip1/WAF-1) expression and promote cell proliferation.

Conclusions:

  • Cadmium induces apoptosis resistance in HepG2 cells, not through direct p53 regulation, but via miR-372-mediated inhibition of p21(Cip1/WAF-1).
  • This study reveals a novel mechanism of cadmium toxicity involving miRNA dysregulation.
  • Further research should explore the role of metallothioneins and p53 conformational changes in cadmium toxicity.