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Matrix metalloproteinases as therapeutic targets for stroke
1Department of Neurology, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA.
Abstract:
Matrix metalloproteinases (MMPs) are important in injury and recovery in ischemic injury. They are proteolytic enzymes that degrade all components of the extracellular matrix (ECM). They are secreted in a latent form, protecting the cell from damage, but once activated induce injury prior to rapid inactivation by four tissue inhibitors to metalloproteinases (TIMPs). Normally the constitutive enzymes, MMP-2 and membrane type MMP (MMP-14), are activated in a spatially specific manner and act close to the site of activation, while the inducible enzymes, MMP-3 and MMP-9, become active through the action of free radicals and other enzymes during neuroinflammation. Because of the complex nature of the interactions with tissues during development, injury and repair, the MMPs have multiple roles, participating in the injury process in the early stages and contributing to recovery during the later stages. This dual role complicates the planning of treatment strategies. This article is part of a Special Issue entitled SI: Cell Interactions In Stroke.
Insights
Matrix metalloproteinases (MMPs) play a dual role in ischemic injury, causing damage early on and aiding recovery later. Understanding these enzymes is key for developing effective stroke treatments.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- Matrix metalloproteinases (MMPs) are enzymes that degrade the extracellular matrix (ECM).
- MMPs are secreted in a latent form and activated upon specific triggers.
- Tissue inhibitors of metalloproteinases (TIMPs) inactivate MMPs.
Purpose of the Study:
- To explore the complex roles of MMPs in ischemic injury and recovery.
- To understand the dual function of MMPs in early injury and later repair phases.
- To highlight the challenges in developing MMP-targeted stroke therapies.
Main Methods:
- Review of existing literature on MMPs in ischemic injury.
- Analysis of the activation mechanisms of constitutive (MMP-2, MMP-14) and inducible (MMP-3, MMP-9) MMPs.
- Discussion of MMPs' interactions with extracellular matrix components and inflammatory processes.
Main Results:
- MMPs contribute to both the initial injury and subsequent repair processes in ischemic conditions.
- Constitutive MMPs are activated spatially specifically, while inducible MMPs are activated during neuroinflammation.
- The dual role of MMPs complicates therapeutic strategies for stroke.
Conclusions:
- MMPs exhibit complex, context-dependent functions in ischemic injury and recovery.
- Targeting MMPs for stroke treatment requires careful consideration of their beneficial and detrimental effects.
- Further research is needed to elucidate MMPs' precise roles in different stages of stroke for optimized therapeutic interventions.
