Regulation of matrix metalloproteinase expressions in astrocytes, microglia and neurons

Neuroimmunomodulation
P E Gottschall, S Deb

Abstract

In neurodegenerative disease or after brain injury, parenchymal cells in the central nervous system are activated to produce inflammatory mediators, mainly consisting of cytokine-induced factors, in a manner similar to, but clearly different from a peripheral inflammatory response. The upregulated expression of several extracellular matrix proteins in astrocytes located surrounding a neuritic plaque in Alzheimer's disease is a good example of such a response. A family of mediators which is cytokine-induced during an inflammatory response in the periphery are the matrix metalloproteinases. Matrix metalloproteinases are calcium-requiring, zinc-containing endopeptidases that constitute a major component of the enzyme cascade responsible for degradation of extracellular matrix proteins such as collagen, proteoglycan and laminin. Little is known about the cellular source or the function of matrix metalloproteinases in the central nervous system or how their expression is regulated in brain. Thus, it was of interest to determine which factors of the so-called 'brain inflammatory response' regulate the expression of these proteases in the nervous system. To this end, we measured the expression of matrix metalloproteinases in cultured ...Continue Reading

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