Electroacupuncture at PC6 inhibited myocardial fibrosis on hypertension-induced myocardial fibrosis in spontaneously hypertensive rats (SHRs), which may be mediated by down-regulation of the enhanced Ang II-TGF-β1-CTGF/TNF-α pathway and up-regulation of the reduced MMP-9 expression [50]. This evidence concerns the gene MMP9 and Myocardial fibrosis.