TLR4 and Myocardial fibrosis: Subcutaneously administered tannic acid decreased myocardial fibrosis and reduced the levels of inflammatory cytokines and apoptosis-associated mediators such as toll-like receptor 4 (TLR4), Nuclear factor kappa B (NF-κB), B-cell lymphoma-2 (Bcl-2), Bcl-2-associated protein (Bax) and the stress-responding kinase p38 in a myocardial fibrosis mouse model induced by isoproterenol 47.