CD4＋Foxp3＋ regulatory T cells converted by rapamycin from peripheral CD4＋ CD25-naive T cells display more potent regulatory ability in vitro  

作　　者：CHEN Jian-fei GAO Jie ZHANG Dong WANG Zi-han ZHU Ji-ye 

机构地区：[1]Department of Hepatobiliary Surgery, Peking University People's Hospital, Peking University Center for Transplantation, Beijing 100044, China [2]Department of Hepatobiliary Surgery, Peking University People's Hospital, Peking University Center for Transplantation, Beijing 100044, China [3]Division of Plastic and Reconstructive Surgery, Department of Surgery, UPMC, Starzl Transplantation Institute, BST W 1500, Lothrop Street 200, Pittsburgh, PA 15261, USA

出　　处：《Chinese Medical Journal》2010年第7期942-948,共7页中华医学杂志（英文版）

基　　金：This work was supported by a grant from the National Natural Science Foundation of China （No. 30772050）.

摘　　要：Background Rapamycin （RAPA） is a relatively new immunosuppressant drug that functions as a serine/threonine kinase inhibitor to prevent rejection in organ transplantation. RAPA blocks activation of T-effector （Teff） cells by inhibiting the response to interleukin-2. Recently, RAPA was also shown to selectively expand the T-regulator （Treg） cell population. To date, no studies have examined the mechanism by which RAPA converts Teff cells to Treg cells. Methods Peripheral CD4＋CD25- naive T cells were cultivated with RAPA and B cells as antigen-presenting cells （APCs） in vitro. CD4＋CD25- T cells were harvested after 6 days and analyzed for expression of forkhead box protein 3 （Foxp3） using flow cytometry. CD4＋CD25＋CD127- subsets as the converted Tregs were isolated from the mixed lymphocyte reactions （MLR） with CD127 negative selection, followed by CD4 and CD25 positive selection using microbeads and magnetic separation column （MSC）. Moreover, mRNA was extracted from converted Tregs and C57BL/6 naive CD4＋CD25＋ T cells and Foxp3 levels were examined by quantitative real-time polymerase chain reaction （rt-PCR）. A total of 1×105 carboxyfluorescein succinimidyl ester （CFSE）-labeled naive CD4＋CD25- T cells/well from C57BL/6 mice were cocultured with DBA/2 or C3H maturation of dendritic cells （mDCs） （0.25×105/well） in 96-well round-bottom plates for 6 days. Then 1×105 or 0.25×105 converted Treg cells were added to every well as regulatory cells. Cells were harvested after 6 days of culture and analyzed for proliferation of CFSE-labeled naive CD4＋CD25- T cells using flow cytometry. Data were analyzed using CellQuest software.Results We found that RAPA can convert peripheral CD4＋CD25- naive T Cells to CD4＋Foxp3＋ Treg cells using B cells as APCs, and this subtype of Treg can potently suppress Teff proliferation and maintain antigenic specificity. Conclusion Our findings provide evidence that RAPA induces Treg cell conversion from Teff cells and uncovers anBackground Rapamycin （RAPA） is a relatively new immunosuppressant drug that functions as a serine/threonine kinase inhibitor to prevent rejection in organ transplantation. RAPA blocks activation of T-effector （Teff） cells by inhibiting the response to interleukin-2. Recently, RAPA was also shown to selectively expand the T-regulator （Treg） cell population. To date, no studies have examined the mechanism by which RAPA converts Teff cells to Treg cells. Methods Peripheral CD4＋CD25- naive T cells were cultivated with RAPA and B cells as antigen-presenting cells （APCs） in vitro. CD4＋CD25- T cells were harvested after 6 days and analyzed for expression of forkhead box protein 3 （Foxp3） using flow cytometry. CD4＋CD25＋CD127- subsets as the converted Tregs were isolated from the mixed lymphocyte reactions （MLR） with CD127 negative selection, followed by CD4 and CD25 positive selection using microbeads and magnetic separation column （MSC）. Moreover, mRNA was extracted from converted Tregs and C57BL/6 naive CD4＋CD25＋ T cells and Foxp3 levels were examined by quantitative real-time polymerase chain reaction （rt-PCR）. A total of 1×105 carboxyfluorescein succinimidyl ester （CFSE）-labeled naive CD4＋CD25- T cells/well from C57BL/6 mice were cocultured with DBA/2 or C3H maturation of dendritic cells （mDCs） （0.25×105/well） in 96-well round-bottom plates for 6 days. Then 1×105 or 0.25×105 converted Treg cells were added to every well as regulatory cells. Cells were harvested after 6 days of culture and analyzed for proliferation of CFSE-labeled naive CD4＋CD25- T cells using flow cytometry. Data were analyzed using CellQuest software.Results We found that RAPA can convert peripheral CD4＋CD25- naive T Cells to CD4＋Foxp3＋ Treg cells using B cells as APCs, and this subtype of Treg can potently suppress Teff proliferation and maintain antigenic specificity. Conclusion Our findings provide evidence that RAPA induces Treg cell conversion from Teff cells and uncovers an

关 键 词：RAPAMYCIN foxp3 B cells CD127 

分 类 号：R[医药卫生]