Related Experiment Video

Updated: Jun 21, 2026

Visualization and Quantitative Analysis of Genotoxin-Induced PARP1/PARP2 Activation in Cells Using a Fluorescent Fusion Protein-Based Reporter
07:53

Visualization and Quantitative Analysis of Genotoxin-Induced PARP1/PARP2 Activation in Cells Using a Fluorescent Fusion Protein-Based Reporter

Published on: April 17, 2026

Inhibition of matrix metalloproteinase-2 by PARP inhibitors

Adrian C Nicolescu1, Andrew Holt, Arulmozhi D Kandasamy

  • 1Departments of Pharmacology and Pediatrics, Cardiovascular Research Centre, University of Alberta, Edmonton, Alta., Canada.

Biochemical and Biophysical Research Communications
|July 22, 2009
PubMed

Insights

Certain poly(ADP-ribosyl) polymerase (PARP) inhibitors demonstrate potential in mitigating heart injury by inhibiting matrix metalloproteinase-2 (MMP-2) activity, suggesting a dual therapeutic mechanism.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Cardiovascular Research

Background:

  • Nitroxidative stress activates matrix metalloproteinase-2 (MMP-2) and poly(ADP-ribosyl) polymerase (PARP).
  • MMP-2 contributes to heart injury under nitroxidative stress, with MMP-2 and PARP inhibitors showing therapeutic benefits.
  • The potential interaction between PARP inhibitors and MMP-2 activity remains largely unexplored.

Purpose of the Study:

  • To investigate the hypothesis that PARP inhibitors can modulate MMP-2 activity.
  • To determine the concentration-dependent effects of various PARP inhibitors on MMP-2.
  • To assess the combined effects of PARP inhibitors and known MMP-2 inhibitors on MMP-2 activity.

Main Methods:

  • Enzyme activity assays utilizing substrate degradation were employed to quantify MMP-2 activity.
  • Four distinct PARP inhibitors (3-AB, PJ-34, 5-AIQ, and EB-47) were tested.
  • IC(50) values were calculated, and experiments involving co-incubation with doxycycline were performed.

Main Results:

  • All four tested PARP inhibitors exhibited concentration-dependent inhibition of 64kDa MMP-2.
  • PJ-34 and 5-AIQ displayed IC(50) values in the high micromolar range, comparable to established MMP-2 inhibitors.
  • 3-AB and EB-47 showed inhibition with millimolar IC(50) values, and 3-AB demonstrated additive inhibition with doxycycline.

Conclusions:

  • This study demonstrates that certain PARP inhibitors can directly inhibit MMP-2 activity.
  • The findings suggest that MMP-2 inhibition may contribute to the cardioprotective effects observed with some PARP inhibitors.
  • These results highlight a potential dual mechanism of action for PARP inhibitors in pathologies involving nitroxidative stress and MMP-2 activation.

More Related Videos

Silencing of BRCA2 to Identify Novel BRCA2-regulated Biological Functions in Cultured Human Cells09:24

Silencing of BRCA2 to Identify Novel BRCA2-regulated Biological Functions in Cultured Human Cells

Published on: August 12, 2015

Cell Death Associated with Abnormal Mitosis Observed by Confocal Imaging in Live Cancer Cells15:53

Cell Death Associated with Abnormal Mitosis Observed by Confocal Imaging in Live Cancer Cells

Published on: August 21, 2013

Related Concept Videos

The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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...
Role of Matrix Metalloproteases in Degradation of ECM01:23

Role of Matrix Metalloproteases in Degradation of ECM

Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult body.
A...
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...
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...
The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...