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475; p http://www.selleckchem.com/products/17-AAG(Geldanamycin).html correlated with portal CD8+ (AST: SR = 0.299; p = 0.028; ALT: SR = 0.269; p = 0.049) and not CD4+ infiltration (AST: p = 0.47; ALT: p = 0.266; data not shown). The clinical diagnoses, treatment of ACR and epicrisis are summarized in Table 2. Seven patients (13%) experienced a second ACR in average 24.4 �� 13 months after the initial episode. These initial biopsies were characterized by a lower portal CD4/CD8 ratio (p = 0.005) and a higher RAI (p = 0.005; Figure 7A and B). In addition, patients with severe ACR (RAI �� 7) tend to have a lower graft survival compared to lower ACR grades (RAI 3�C6) and other causes of graft hepatitis (RAI http://www.selleckchem.com/products/lgk-974.html during various rejection grades in kidney and heart transplants (25�C31). However, this is the first study describing in detail the portal infiltration density and portal T cell ratios in relation to the severity of ACR in human liver allografts. Although Kubota et al. described a continuous decrease of portal CD4 infiltration with severity of ACR after LT, their data concerning growing CD8+ T cell infiltration are consistent with our http://www.selleck.cn/products/VX-809.html results (32). The correlation of CD8+ and not CD4+ cell densities with serum transaminases suggests that CD8+ T cells might be more important for hepatocyte damage in severe ACR. Moreover, patients with increased CD8+ T cell concentration had an increased risk for subsequent ACRs. Increased portal CD8+ densities were also reported in chronic rejections (22). Consistently increased levels of CD8+ T cells markers are found in kidney and lung during ACR (26,33,34). Recent reports provided conflicting data concerning intrahepatic Treg content during ACR. An increase of intrahepatic Tregs was reported in a rat model of LT, but the Treg/Teff ratio remained obscure in that setting (35). Although Li et al. described a higher portal FOXP3+ cell infiltration density in tolerated compared to chronically rejected grafts (22), Stenard et al.