[Effect of rapamycin in inducing naïve murine effector T cell convert to regulatory T cell].
OBJECTIVE
To study the effect of rapamycin in inducing naïve murine effector T cell (Teff) convert to regulatory T cell (Treg) in vitro.


METHODS
The forkhead box protein 3 (FoxP3) negative Teff were isolated and purified from the spleen and lymph node of C57 BL/6 murines aged 6-8 weeks, then Teff were cultured in three groups with mature dendritic cells (mDC), B cells, and plate coated Anti-CD3. In addition, the control wells and the test wells were prepared in each group, rapamycin were not added in the control wells but added in the test wells with concentrations of 1, 10, 50, and 100 nmol/L. Percentages of FoxP3 positive Treg were examined by flow cytometry after 4 days in Anti-CD3 group and after 6 days in the other two groups.


RESULTS
As shown by the flow cytometry, the percentages of FoxP3 positive Treg were as follows in three group: in the mDC group, it was 0.01% in the control well and 0.39%, 0.47%, 0.34%, and 0.26% in test wells; in B cell group, it was 0.01% in the control wells and 5.56%, 5.89%, 7.15%, and 4.72% in the test wells; in Anti-CD3 group, it was 0.93% in the control wells and 1.35%, 1.07%, 1.02%, and 1.19% in test wells. No significant difference was found between the test wells and control wells in the mDC group and Anti-CD3 group; however, the percentages of FoxP3 positive Treg was significantly different between the test wells and control wells in the B cell group (P < 0.01).


CONCLUSIONS
When B cell is acted as the antigen-presenting cell, rapamycin can effectively induce Teff convert to Treg in vitro.
Gao
Jie
J
Department of Hepatobiliary Surgery, Peking University People's Hospital, Peking University Center for Organ Transplantation, Beijing 100044, China.
Chen
Jian-fei
JF
Wang
Zi-han
ZH
Song
Zhao-min
ZM
Zhu
Ji-ye
JY
D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D002454:Cell Differentiation / Q000187:drug effects*; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D005434:Flow Cytometry; D051858:Forkhead Transcription Factors / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D054504:Precursor Cells, T-Lymphoid / Q000166:cytology* / Q000187:drug effects* / Q000276:immunology; D020123:Sirolimus / Q000494:pharmacology*; D016176:T-Lymphocyte Subsets / Q000166:cytology* / Q000187:drug effects / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000166:cytology* / Q000187:drug effects / Q000276:immunology
D051858:Forkhead Transcription Factors; C498833:Foxp3 protein, mouse; D020123:Sirolimus