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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 J+Biomed+Sci
2017 ; 24
(1
): 35
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English Wikipedia
Cancer immunotherapy by targeting immune checkpoints: mechanism of T cell
dysfunction in cancer immunity and new therapeutic targets
#MMPMID28545567
Tsai HF
; Hsu PN
J Biomed Sci
2017[May]; 24
(1
): 35
PMID28545567
show ga
Immune checkpoints or coinhibitory receptors, such as cytotoxic T lymphocyte
antigen (CTLA)-4 and programmed death (PD)-1, play important roles in regulating
T cell responses, and they were proven to be effective targets in treating
cancer. In chronic viral infections and cancer, T cells are chronically exposed
to persistent antigen stimulation. This is often associated with deterioration of
T cell function with constitutive activation of immune checkpoints, a state
called 'exhaustion', which is commonly associated with inefficient control of
tumors and persistent viral infections. Immune checkpoint blockade can
reinvigorate dysfunctional/exhausted T cells by restoring immunity to eliminate
cancer or virus-infected cells. These immune checkpoint blocking antibodies have
moved immunotherapy into a new era, and they represent paradigm-shifting
therapeutic strategies for cancer treatment. A clearer understanding of the
regulatory roles of these receptors and elucidation of the mechanisms of T cell
dysfunction will provide more insights for rational design and development of
cancer therapies that target immune checkpoints. This article reviews recent
advance(s) in molecular understanding of T cell dysfunction in tumor
microenvironments. In addition, we also discuss new immune checkpoint targets in
cancer therapy.