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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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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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Establishment of Proliferative Tetraploid Cells from Nontransformed Human Fibroblasts
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Ceramide Synthase 6 Maximizes p53 Function to Prevent Progeny Formation from Polyploid Giant Cancer Cells.

Ping Lu1, Shai White-Gilbertson1, Gyda Beeson2

  • 1Department of Microbiology & Immunology, Medical University of South Carolina, Charleston, SC 29425, USA.

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Polyploid giant cancer cells (PGCC) rely on acid ceramidase (ASAH1) for progeny formation. Targeting sphingolipid metabolism, specifically C16-ceramide accumulation via CerS6 and p53, inhibits PGCC proliferation, offering potential clinical interventions.

Keywords:
cancerceramideceramide synthasepolyploidysphingolipids: p53

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Area of Science:

  • Cell Biology
  • Cancer Research
  • Biochemistry

Background:

  • Polyploid giant cancer cells (PGCC) are transiently senescent cells arising from stress.
  • PGCC generate progeny through a cell division dependent on acid ceramidase (ASAH1).

Purpose of the Study:

  • To investigate sphingolipid metabolism differences in PGCC.
  • To understand the role of ASAH1 in PGCC progeny formation.

Main Methods:

  • Steady-state and flux analysis of sphingolipids.
  • Modulation of C16-ceramide levels using CerS6 and p53.
  • Assessment of PGCC progeny formation.

Main Results:

  • ASAH1 activity prevents accumulation of long-chain ceramides like C16-ceramide.
  • Co-expression of CerS6 and p53 abrogated PGCC progeny formation.
  • CerS6 enhanced p53's effect by increasing its protein half-life, suggesting a positive feedback loop.

Conclusions:

  • Sphingolipid metabolism is functionally important in PGCC.
  • Targeting ASAH1 and C16-ceramide pathways offers potential for cancer therapy.