
Abstract Background Multiple lines of evidence suggest that genetic factors contribute to stroke recovery. The matrix metalloproteinases -2 (MMP-2) and -9 (MMP-9) are modulators of extracellular matrix components, with important regulatory functions in the Central Nervous System (CNS). Shortly after stroke, MMP-2 and MMP-9 have mainly damaging effects for brain tissue. However, MMPs also have a beneficial activity in angiogenesis and neurovascular remodelling during the delayed neuroinflammatory response phase, thus possibly contributing to stroke functional recovery. Methods In the present study, the role of MMP-2 and MMP-9 genetic variants in stroke recovery was investigated in 546 stroke patients. Functional outcome was assessed three months after a stroke episode using the modified Rankin Scale (mRS), and patients were classified in two groups: good recovery (mRS ≤ 1) or poor recovery (mRS>1). Haplotype tagging single nucleotide polymorphisms (SNPs) in the MMP-2 (N = 21) and MMP-9 (N = 4) genes were genotyped and tested for association with stroke outcome, adjusting for significant non-genetic clinical variables. Results Six SNPs in the MMP-2 gene were significantly associated with stroke outcome (0.0018<P < 0.0415), two of which survived the Bonferroni correction for multiple testing. In the subset of ischemic stroke patients, association of five of these SNPs remained positive (0.0042<P < 0.0306). No significant associations were found for the MMP-9 gene. Conclusions The results presented strongly indicate that MMP-2 genetic variants are an important mediator of functional outcome after stroke.
Adult, Male, Time Factors, Genotype, Brain, QH426-470, Middle Aged, RC31-1245, Polymorphism, Single Nucleotide, Stroke, Treatment Outcome, Gene Frequency, Haplotypes, Matrix Metalloproteinase 9, Genetics, Humans, Matrix Metalloproteinase 2, Genetics(clinical), Female, Internal medicine, Research Article
Adult, Male, Time Factors, Genotype, Brain, QH426-470, Middle Aged, RC31-1245, Polymorphism, Single Nucleotide, Stroke, Treatment Outcome, Gene Frequency, Haplotypes, Matrix Metalloproteinase 9, Genetics, Humans, Matrix Metalloproteinase 2, Genetics(clinical), Female, Internal medicine, Research Article
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