Related Experiment Video

Updated: Aug 8, 2026

Use of Interferon-γ Enzyme-linked Immunospot Assay to Characterize Novel T-cell Epitopes of Human Papillomavirus
13:41

Use of Interferon-γ Enzyme-linked Immunospot Assay to Characterize Novel T-cell Epitopes of Human Papillomavirus

Published on: March 8, 2012

Interferon-beta induces S phase slowing via up-regulated expression of PML in squamous carcinoma cells

S Vannucchi1, Z A Percario, M V Chiantore

  • 1Laboratory of Virology, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.

Oncogene
|October 24, 2000
PubMed

Insights

Type I Interferon (IFN) and all-trans retinoic acid (RA) inhibit squamous cell carcinoma (SCC) proliferation. PML protein up-regulation by IFN-beta causes cell cycle arrest, offering insights into tumor suppression mechanisms.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Type I Interferon (IFN) and all-trans retinoic acid (RA) are known to inhibit cancer cell proliferation.
  • Squamous cell carcinoma (SCC) lines, such as ME-180 and SiHa, exhibit sensitivity to these agents, but the underlying mechanisms require further elucidation.

Purpose of the Study:

  • To investigate the cell cycle effects of IFN-beta and RA on SCC.
  • To explore the role of PML (Promyelocytic Leukemia) protein in IFN-beta-induced growth inhibition.
  • To determine if PML overexpression can replicate the cell cycle alterations observed with IFN-beta treatment.

Main Methods:

  • Treatment of SCC cell lines (ME-180, SiHa) with IFN-beta and/or RA.
  • Flow cytometry analysis to assess cell cycle progression (S phase, G1 accumulation).
  • Retroviral transduction using PML-PINCO to overexpress PML protein in SCC cells.

Main Results:

  • IFN-beta treatment induced a specific S phase delay and subsequent cell death in SCC lines.
  • RA potentiated IFN-beta's effect in ME-180 cells but had limited impact on the RA-resistant SiHa line.
  • IFN-beta treatment led to increased PML expression, which correlated with S phase lengthening.
  • Overexpression of PML via retroviral vectors reproduced the IFN-beta-induced S phase delay.

Conclusions:

  • PML protein up-regulation is a key mechanism by which IFN-beta inhibits SCC cell cycle progression.
  • PML overexpression alone can induce S phase lengthening, suggesting its direct role in IFN-beta's anti-proliferative effects.
  • These findings highlight the tumor-suppressive function of PML and its potential involvement in IFN-mediated cancer therapies.

More Related Videos

Vaccinia Reporter Viruses for Quantifying Viral Function at All Stages of Gene Expression10:48

Vaccinia Reporter Viruses for Quantifying Viral Function at All Stages of Gene Expression

Published on: May 15, 2014

A Murine Cell Line Based Model of Chronic CDK9 Inhibition to Study Widespread Non-Genetic Transcriptional Elongation Defects (TEdeff) in Cancers10:49

A Murine Cell Line Based Model of Chronic CDK9 Inhibition to Study Widespread Non-Genetic Transcriptional Elongation Defects (TEdeff) in Cancers

Published on: September 26, 2019

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...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...