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T follicular helper and memory cell responses and the mTOR pathway in murine heart transplantation.


ABSTRACT:

Background

The mammalian target of rapamycin (mTOR) inhibitors are valuable immunosuppressants in clinical transplantation; however, the mTOR regulation of allogeneic T-cell responses is not fully understood yet. Therefore, the objective of this study is to investigate the effects of T-cell-specific mTOR deletion on the allogeneic T-cell responses and heart transplant survival.

Methods

BALB/c heart allografts, with or without BALB/c skin sensitization, were transplanted in the wild-type C57BL/6, Mtorfl/flCd4-Cre, Stat3fl/flCd4-Cre, and Mtorfl/flStat3fl/flCd4-Cre mice. Graft survival and histology, as well as T-cell frequencies and phenotypes, were evaluated after transplantation.

Results

In the absence of donor skin sensitization, long-term heart allograft survival was achieved in the Mtorfl/flCd4-Cre recipients, which was associated with significantly decreased frequencies of CD62L-CD44+ effector T cells and BCL-6+CXCR5+ T follicular helper (Tfh) cells in the periphery. Long-term heart allograft survival was also achieved in the donor skin-sensitized Mtorfl/flStat3fl/flCd4-Cre mice, whereas the heart allograft survival was prolonged in the donor skin-sensitized Mtorfl/flCd4-Cre and Stat3fl/flCd4-Cre mice.

Conclusions

mTOR is required for Tfh cell response in murine heart transplantation. T-cell-specific deletion of both mTOR and Stat3 abrogates the memory response to heart transplants. These findings help us to better understand the molecular mechanisms underlying the T cell immunity to transplanted organs.

SUBMITTER: Xie A 

PROVIDER: S-EPMC6981023 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Publications

T follicular helper and memory cell responses and the mTOR pathway in murine heart transplantation.

Xie Aini A   Yan Hui H   Fu Jinfei J   He Adam A   Xiao Xiang X   Li Xian C XC   Chen Wenhao W  

The Journal of heart and lung transplantation : the official publication of the International Society for Heart Transplantation 20191126 2


<h4>Background</h4>The mammalian target of rapamycin (mTOR) inhibitors are valuable immunosuppressants in clinical transplantation; however, the mTOR regulation of allogeneic T-cell responses is not fully understood yet. Therefore, the objective of this study is to investigate the effects of T-cell-specific mTOR deletion on the allogeneic T-cell responses and heart transplant survival.<h4>Methods</h4>BALB/c heart allografts, with or without BALB/c skin sensitization, were transplanted in the wil  ...[more]

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