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Related Concept Videos

Abnormal Proliferation02:23

Abnormal Proliferation

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 daughter...
Abnormal Proliferation02:23

Abnormal Proliferation

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 daughter...
Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
Cancer Stem Cells and Tumor Maintenance02:40

Cancer Stem Cells and Tumor Maintenance

Early diagnosis and treatment can often cure cancer. However, even with treatment, residual cells called cancer stem cells (CSC) might remain, often causing tumor recurrence. These cancer stem cells possess the potential for self-renewal and multi-lineage differentiation and are often responsible for the therapeutic resistance displayed in most cancers.
Cancer stem cells are thought to originate from tissue-specific normal stem cells or progenitor cells. The normal stem cells usually reside in...
Cancers Originate from Somatic Mutations in a Single Cell02:21

Cancers Originate from Somatic Mutations in a Single Cell

Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
Treatment Resistant Cancers02:56

Treatment Resistant Cancers

Cancer is the second leading cause of death in the United States. A cancer cell is genetically unstable and hence can mutate faster. They can also modify their microenvironment and escape immune surveillance. The difficulties in treating cancer are further compounded by the emergence of rapid resistance to anticancer drugs. The most common ways to attain resistance in cancer cells include alteration in drug transport and metabolism, modification of drug target, elevated DNA damage response, or...

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Manipulation of Ploidy in Caenorhabditis elegans
07:54

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Published on: March 15, 2018

Illicit survival of cancer cells during polyploidization and depolyploidization.

I Vitale1, L Galluzzi, L Senovilla

  • 1INSERM U848, Villejuif, France.

Cell Death and Differentiation
|November 13, 2010
PubMed
Summary

Tetraploidy, a state of having four sets of chromosomes, can drive cancer development. Cells that bypass safeguards against tetraploidy often become unstable, leading to new cancer-driving mechanisms.

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Area of Science:

  • Cell Biology
  • Genetics
  • Cancer Research

Background:

  • Tetraploidy (four sets of chromosomes) and subsequent depolyploidization are implicated in oncogenesis.
  • Cells possess evolved mechanisms to prevent the generation, survival, proliferation, and depolyploidization of tetraploid cells.
  • Illicitly surviving tetraploid cells exhibit chromosomal instability and aneuploidization.

Purpose of the Study:

  • To describe the regulation and molecular mechanisms of the polyploidization-depolyploidization cascade.
  • To focus on the role of oncogenes and tumor suppressor genes in tetraploidy-driven tumorigenesis.
  • To explore novel therapeutic strategies targeting tetraploid or aneuploid cancer cells.

Main Methods:

  • Review of regulatory pathways governing tetraploidy.
  • Analysis of molecular mechanisms of chromosomal instability and rearrangements.
  • Investigation of oncogene and tumor suppressor gene involvement in tetraploidization.

Main Results:

  • Tetraploids undergo chromosomal rearrangements, leading to pseudodiploidy via multipolar or illicit bipolar divisions.
  • Dysregulation of cell cycle checkpoints contributes to tetraploid cell survival and proliferation.
  • Oncogenes and tumor suppressor genes play critical roles in tetraploidy-driven cancer development.

Conclusions:

  • Understanding the tetraploidy-depolyploidization cascade is crucial for cancer research.
  • Targeting specific survival pathways in tetraploid/aneuploid cancer cells may offer novel therapeutic avenues.
  • Further research into signaling/metabolic cascades could lead to broad-spectrum anticancer agents.