Related Experiment Video

Updated: May 18, 2026

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
05:17

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay

Published on: February 9, 2021

Thymoquinone hydrazone derivatives cause cell cycle arrest in p53-competent colorectal cancer cells

André Wirries1, Sandra Breyer, Karl Quint

  • 1Department of Medicine 1, University Hospital Erlangen, 91054 Erlangen;

Experimental and Therapeutic Medicine
|September 21, 2012
PubMed

Insights

Modified thymoquinone (TQ) derivatives show promise in cancer therapy. These compounds inhibit cancer cell proliferation by activating p21(cip1/waf1), particularly in p53-competent cells, suggesting improved clinical development potential.

Area of Science:

  • Pharmacology
  • Molecular Biology
  • Cancer Research

Background:

  • Thymoquinone (TQ), a key component of black seed oil, exhibits anti-cancer properties by inducing apoptosis.
  • Clinical application of TQ is hindered by poor membrane permeability and chemical instability.
  • Fatty acid modifications of TQ were explored to enhance its anti-cancer efficacy.

Purpose of the Study:

  • To synthesize and evaluate novel TQ derivatives with improved cellular uptake and anti-cancer activity.
  • To investigate the effects of these derivatives on cancer cell proliferation, apoptosis, and cell cycle regulation.
  • To determine the role of p53 status in the response to TQ derivatives.

Main Methods:

  • Synthesis of thymoquinone-fatty acid hydrazone derivatives (TQ-H-10, TQ-H-11).
  • In vitro evaluation of cell proliferation and apoptosis in HCT116, HCT116(p53-/-), and HepG2 cancer cell lines.
  • Analysis of cell cycle progression and key regulatory proteins (p21, cyclin E).

Main Results:

  • TQ derivatives (TQ-H-10, TQ-H-11) induced cytostatic effects, notably in p53-competent HCT116 colon cancer cells.
  • Treatment led to cell cycle arrest at the S/G2 phase, mediated by increased p21(cip1/waf1) and decreased cyclin E.
  • Cells lacking p53 (HCT116(p53-/-)) and HepG2 cells showed a diminished response to TQ-H-10.

Conclusions:

  • TQ derivatives inhibit cancer cell proliferation in a p53-dependent manner.
  • Activation of p21(cip1/waf1) is a key mechanism for TQ derivative-induced cell cycle arrest.
  • Structural modification of TQ offers a viable strategy for developing more effective anti-cancer agents.

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

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...
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...
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...
Drugs that Destabilize Microtubules01:10

Drugs that Destabilize Microtubules

Microtubules are dynamic structures and can be regulated by microtubule targeting agents (MTAs). Microtubule destabilizing drugs are a class of MTAs that destabilize and prevent microtubules' polymerization. Both natural and synthetic chemicals can be found under this class of drugs. Vincristine and vinblastine, two vinca alkaloids, and colchicine were among the first to be discovered. These drugs can affect cells in various ways, either by inducing a change in cell morphology, preventing...