SAHA, an HDAC inhibitor, synergizes with tacrolimus to Prevent murine cardiac allograft rejection

• Published in: Cellular & molecular immunology Vol. 9; no. 5; pp. 390 - 398
• Main Authors: Zhang, Xin, Han, Shu, Kang, Yindong, Guo, Meng, Hong, Shanjuan, Liu, Fang, Fu, Shangxi, Wang, Liming, Wang, Quan-Xing
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01-09-2012; Nature Publishing Group
• Subjects: Allografts; Animals; Antibodies; Apoptosis; Biomedical and Life Sciences; Biomedicine; Calcineurin; Calcineurin inhibitors; CD4 antigen; CD4-Positive T-Lymphocytes - metabolism; Cell Proliferation; CTLA-4 Antigen - metabolism; CTLA-4 protein; Drug Synergism; Effector cells; Forkhead Transcription Factors - metabolism; Foxp3 protein; Graft rejection; HDAC; Heart Transplantation; Helper cells; Histone deacetylase; Histone Deacetylase Inhibitors - pharmacology; Hydroxamic acid; Hydroxamic Acids - pharmacology; Immunology; Immunosuppression; Immunosuppressive agents; Immunosuppressive Agents - pharmacology; Immunosuppressive Agents - therapeutic use; Interferon; Interleukin 10; Interleukin 17; Interleukin-17 - immunology; Interleukin-17 - metabolism; Lymphocytes T; Male; Medical Microbiology; Mice; Mice, Inbred BALB C; Mice, Inbred C57BL; Microbiology; research-article; Stat3 protein; Synergism; Tacrolimus; Tacrolimus - pharmacology; Tacrolimus - therapeutic use; Transplantation, Homologous - immunology; Vaccine; 协同作用; 小鼠; 心脏移植; 排斥反应; 组蛋白去乙酰化酶; 调节性T细胞; 酶抑制剂; HDAC inhibitor; allograft rejection; Th17; Treg
• ISSN: 1672-7681; 2042-0226
• DOI: 10.1038/cmi.2012.28

Suberoylanilide hydroxamic acid （SAHA）, as a histone deacetylase （HDAC） inhibitor （HDACi）, was recently found to exhibit an immunosuppressive effect. However, whether SAHA can synergize with calcineurin inhibitors （CNIs） to inhibit allograft rejection and its underlying mechanism remain elusive. In this study, we demonstrated the synergistic effects of SAHA and non-therapeutic dose of tacrolimus （FK506） in prolonging the allograft survival in a murine cardiac transplant model. Concomitant intragraft examination revealed that allografts from SAHA-treated recipients showed significantly lower levels of IL-17 expression, and no discernable difference for IL-17 expressions was detected between SAHA- and SAHA/FK506-treated allograft as compared with allografts from FK506-treated animals. In contrast, administration of FK506 significantly suppressed interferon （IFN）-y but increased IL-IO expression as compared with that of SAHA-treated animals, and this effect was independent of SAHA. Interestingly, SAHA synergizes with FK506 to promote Foxp3 and CTLA4 expression. In vitro, SAHA reduced the proportion of Th17 cells in isolated CD4＋ T-cell population and decreased expressions of IL-17A, IL-17F, STAT3 and RORyt in these cells. Moreover, SAHA enhances suppressive function of regulatory T （Treg） cells by upregulating the expression of CTLA-4 without affecting T effector cell proliferation, and increased the proportion of Treg by selectively promoting apoptosis of T effector cells. Therefore, SAHA, a HDACi, may be a promising immunosuppressive agent with potential benefit in conjunction with CNI drugs.