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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+One
2017 ; 12
(8
): e0183976
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gab.com Text
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Transfer of in vitro-expanded naïve T cells after lymphodepletion enhances
antitumor immunity through the induction of polyclonal antitumor effector T
cells
#MMPMID28854279
Tanaka T
; Watanabe S
; Takahashi M
; Sato K
; Saida Y
; Baba J
; Arita M
; Sato M
; Ohtsubo A
; Shoji S
; Nozaki K
; Ichikawa K
; Kondo R
; Aoki N
; Ohshima Y
; Sakagami T
; Abe T
; Moro H
; Koya T
; Tanaka J
; Kagamu H
; Yoshizawa H
; Kikuchi T
PLoS One
2017[]; 12
(8
): e0183976
PMID28854279
show ga
The adoptive transfer of effector T cells combined with lymphodepletion has
demonstrated promising antitumor effects in mice and humans, although the
availability of tumor-specific T cells is limited. We and others have also
demonstrated that the transfer of polyclonal naïve T cells induces tumor-specific
effector T cells and enhances antitumor immunity after lymphodepletion. Because
tumors have been demonstrated to induce immunosuppressive networks and regulate
the function of T cells, obtaining a sufficient number of fully functional naïve
T cells that are able to differentiate into tumor-specific effector T cells
remains difficult. To establish culture methods to obtain a large number of
polyclonal T cells that are capable of differentiating into tumor-specific
effector T cells, naïve T cells were activated with anti-CD3 mAbs in vitro. These
cells were stimulated with IL-2 and IL-7 for the CD8 subset or with IL-7 and
IL-23 for the CD4 subset. Transfer of these hyperexpanded T cells after
lymphodepletion showed significant antitumor efficacy, and tumor-specific
effector T cells were primed from these expanded T cells in tumor-bearing hosts.
Moreover, these ex vivo-expanded T cells maintained T cell receptor diversity and
showed long-term persistence of memory against specific tumors. Further analyses
revealed that combination therapy consisting of vaccination with dendritic cells
that were co-cultured with irradiated whole tumor cells and the transfer of ex
vivo-expanded T cells significantly enhanced antitumor immunity. These results
indicate that the transfer of ex vivo-expanded polyclonal T cells can be combined
with other immunotherapies and augment antitumor effects.