Related Experiment Video
Updated: Jan 26, 2026
Detection of Functional Matrix Metalloproteinases by Zymography
Published on: November 8, 2010
PARP-1 inhibition provides protection against elastase-induced emphysema by mitigating the expression of matrix
Vivek Dharwal1, Rajat Sandhir1, Amarjit S Naura2
1Department of Biochemistry, Panjab University, Chandigarh, 160014, India.
Abstract:
In our previous study, we have shown that PARP-1 inhibition (genetic or pharmacological) ameliorates elastase-induced inflammation and emphysema. Since matrix metalloproteinases (MMPs) particularly MMP-2 and MMP-9 are known to play a critical role in emphysema development, the present work was designed to evaluate the effects of PARP-1 inhibition on their expression utilizing elastase-induced mouse model of emphysema. Our data show that olaparib administration at a dose of 5 mg/kg b.wt. (daily) significantly prevented the elastase-induced inflammation as indicated by decreased inflammatory cells particularly macrophages in BALF at 1 week post-injury. In addition, the drug restored the altered redox balance in the lungs of elastase-treated mice toward normal. Further, PCR data show that olaparib administration ameliorates the elastase-induced expression of MMP-2 and MMP-9 without having much effect on the expressions of their inhibitors TIMP-1 and TIMP-2. Next, our data on immunoblot, gelatin zymography, and immunohistochemical analysis indeed confirm that olaparib reduced the elastase-induced expression of MMP-2 and MMP-9. Reduction in the expression of metalloproteinases correlate well with the PARP activity as olaparib treatment suppressed the elastase-induced expression of PAR modified proteins markedly. Overall, our data strongly suggest that PARP-1 inhibition blunts elastase-induced MMP-2 and MMP-9 expression, which may be partly responsible for prevention of emphysema.
Insights
Poly (ADP-ribose) polymerase-1 (PARP-1) inhibition reduces inflammation and matrix metalloproteinase (MMP) expression in an emphysema model. This suggests PARP-1 inhibition may prevent emphysema by targeting MMP-2 and MMP-9.
Area of Science:
- Pulmonary Medicine
- Molecular Biology
- Pharmacology
Background:
- Emphysema involves inflammation and matrix metalloproteinases (MMPs), particularly MMP-2 and MMP-9.
- Previous studies indicated Poly (ADP-ribose) polymerase-1 (PARP-1) inhibition ameliorates inflammation and emphysema.
Purpose of the Study:
- To investigate the effect of PARP-1 inhibition on MMP-2 and MMP-9 expression in an elastase-induced mouse model of emphysema.
- To evaluate the therapeutic potential of PARP-1 inhibition in emphysema.
Main Methods:
- Elastase-induced mouse model of emphysema.
- Administration of olaparib (a PARP-1 inhibitor) at 5 mg/kg daily.
- Analysis of bronchoalveolar lavage fluid (BALF) for inflammatory cells (macrophages).
- Assessment of lung redox balance.
- Quantitative PCR (qPCR) for MMP-2, MMP-9, TIMP-1, and TIMP-2 expression.
- Immunoblotting, gelatin zymography, and immunohistochemistry for MMP-2 and MMP-9.
- Measurement of PAR-modified proteins to assess PARP activity.
Main Results:
- Olaparib significantly reduced elastase-induced inflammation and macrophage infiltration in BALF.
- Olaparib treatment restored the altered lung redox balance.
- PCR data showed olaparib ameliorated elastase-induced MMP-2 and MMP-9 expression without affecting TIMP-1 and TIMP-2.
- Immunoblotting, zymography, and immunohistochemistry confirmed reduced MMP-2 and MMP-9 expression.
- Reduced MMP expression correlated with suppressed PARP activity (decreased PAR-modified proteins).
Conclusions:
- PARP-1 inhibition effectively blunts elastase-induced MMP-2 and MMP-9 expression in an emphysema model.
- This reduction in MMPs may be a key mechanism by which PARP-1 inhibition prevents emphysema.
- Olaparib demonstrates potential as a therapeutic agent for emphysema by targeting inflammatory pathways and matrix remodeling.
Related Concept Videos
00:46Feedback Inhibition
01:42The Extracellular Matrix
01:42What is Gene Expression?
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
01:16Zones of Protection
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...
02:31Protection of Alcohols
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
01:27Protecting Self-Esteem