Related Experiment Video

Updated: Aug 8, 2026

Analysis of Cell Cycle Position in Mammalian Cells
12:19

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

Adriamycin induced G2/M cell cycle arrest in transitional cell cancer cells with wt p53 and p21(WAF1/CIP1) genes

V Bilim1, T Kawasaki, K Takahashi

  • 1Dept. of Urology. Niigata University School of Medicine, Japan.

Journal of Experimental & Clinical Cancer Research : CR
|March 30, 2001
PubMed

Insights

Adriamycin (ADM) treatment causes G2 cell cycle arrest in bladder cancer cells, even with wild-type p53 and p21(WAF1/CIP1). This unexpected arrest occurs despite increased p53 and p21(WAF1/CIP1) expression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Adriamycin (ADM) is a chemotherapy agent used for bladder tumors, known to induce apoptosis.
  • Understanding ADM's impact on cell cycle regulation is crucial for optimizing bladder cancer treatment.
  • The roles of p53 and p21(WAF1/CIP1) in ADM-induced cell cycle arrest require further elucidation.

Purpose of the Study:

  • To investigate the effect of Adriamycin (ADM) on cell cycle progression in bladder cancer cell lines.
  • To analyze the expression of cell cycle regulating proteins in response to ADM treatment.
  • To determine the influence of p53 and p21(WAF1/CIP1) status on ADM's effects on bladder cancer cells.

Main Methods:

  • Utilized flow cytometry to assess cell cycle distribution in T24, HT-1376, RT4, and SCaBER bladder cancer cell lines.
  • Employed immunoblotting to analyze the expression levels of key cell cycle regulatory proteins.
  • Examined the impact of ADM on wild-type p53, p21(WAF1/CIP1), Retinoblastoma (Rb), and PCNA protein expression.

Main Results:

  • ADM treatment of RT4 cells (wild-type p53 and p21(WAF1/CIP1)) induced G2 phase cell cycle arrest, not the anticipated G1 arrest.
  • ADM significantly increased the expression of both p53 and p21(WAF1/CIP1) proteins in RT4 cells.
  • A decrease in Retinoblastoma (Rb) protein expression was observed, while PCNA expression remained unchanged.

Conclusions:

  • Bladder cancer cells with wild-type p53 and p21(WAF1/CIP1) can undergo G2 cell cycle arrest upon Adriamycin (ADM) treatment.
  • The accumulation of p53 and p21(WAF1/CIP1) induced by genotoxic stimuli like ADM may lead to G2 arrest, independent of G1 arrest.
  • These findings highlight a complex mechanism of ADM-induced cell cycle regulation in bladder cancer, potentially influencing therapeutic strategies.

More Related Videos

Through the Looking Glass: Time-lapse Microscopy and Longitudinal Tracking of Single Cells to Study Anti-cancer Therapeutics06:00

Through the Looking Glass: Time-lapse Microscopy and Longitudinal Tracking of Single Cells to Study Anti-cancer Therapeutics

Published on: May 14, 2016

Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols12:02

Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols

Published on: June 6, 2017

Related Concept Videos

Negative Regulator Molecules01:23

Negative Regulator Molecules

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.
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

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...
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

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...
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...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

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...
Inhibition of CDK Activity02:34

Inhibition of CDK Activity

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...