Related Experiment Video

Updated: Aug 14, 2026

Synthesis and Characterization of an Aspirin-fumarate Prodrug that Inhibits NFκB Activity and Breast Cancer Stem Cells
13:38

Synthesis and Characterization of an Aspirin-fumarate Prodrug that Inhibits NFκB Activity and Breast Cancer Stem Cells

Published on: January 18, 2017

Activation of NFkappaB is inhibited by curcumin and related enones

Waylon M Weber1, Lucy A Hunsaker, C Nathaniel Roybal

  • 1Department of Chemistry, University of New Mexico, Albuquerque, NM 87131, USA.

Bioorganic & Medicinal Chemistry
|December 13, 2005
PubMed

Insights

Curcumin analogues were tested for their ability to inhibit NFkappaB activation in cancer cells. Several analogues, particularly those with a 5-carbon spacer, showed greater inhibitory activity than curcumin itself.

Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Nuclear factor kappa B (NFkappaB) is upregulated in many cancers, promoting cell survival and inhibiting apoptosis.
  • Curcumin, a natural product, is known to inhibit NFkappaB activation.
  • Enone analogues of curcumin offer potential for enhanced therapeutic properties.

Purpose of the Study:

  • To synthesize and evaluate novel enone analogues of curcumin for their inhibitory activity against NFkappaB activation.
  • To compare the efficacy of these analogues with curcumin in a cancer cell model.
  • To explore structure-activity relationships, including spacer length and heterocyclic ring incorporation.

Main Methods:

  • Utilized Panomics' NFkappaB Reporter Stable Cell Line to assess NFkappaB activation.
  • Tested curcumin and various enone analogues with different carbon spacer lengths (3, 5, and 7 carbons).
  • Determined the inhibitory concentration (IC50) for potent analogues.

Main Results:

  • Inhibitors of NFkappaB activation were identified across all tested analogue series.
  • Several analogues demonstrated greater inhibitory activity than curcumin.
  • Enone analogues with a 5-carbon spacer, including those with heterocyclic rings, were particularly potent, with 1,5-Bis(3-pyridyl)-1,4-pentadien-3-one showing the highest activity (IC50 = 3.4 μM).
  • Inhibitory activity did not correlate with antioxidant properties, suggesting a mechanism beyond general antioxidant effects.

Conclusions:

  • Curcumin and its enone analogues can effectively inhibit NFkappaB activation.
  • Specific structural modifications, such as a 5-carbon spacer and heterocyclic rings, enhance inhibitory potency.
  • The anti-cancer effects of these compounds likely stem from direct inhibition of NFkappaB pathway targets, not solely from antioxidant activity.

Related Concept Videos

NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Enzyme-linked Receptors01:00

Enzyme-linked Receptors

Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
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...
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...