MMP12 and Alzheimer disease: Among the highest dysregulated genes are key AD genes, including markers of general inflammation (MMP12), specific T helper activation (e.g. Th2/CCL18, Th1/IFN/CXCL10, Th17/PI3/elafin, Th17/Th22 S100A7/A8/A9), and markers of epidermal proliferation (KRT16, Mki67).