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2016 ; 5
(7
): e1175800
Nephropedia Template TP
gab.com Text
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Regulatory T cells with multiple suppressive and potentially pro-tumor activities
accumulate in human colorectal cancer
#MMPMID27622025
Timperi E
; Pacella I
; Schinzari V
; Focaccetti C
; Sacco L
; Farelli F
; Caronna R
; Del Bene G
; Longo F
; Ciardi A
; Morelli S
; Vestri AR
; Chirletti P
; Barnaba V
; Piconese S
Oncoimmunology
2016[Jul]; 5
(7
): e1175800
PMID27622025
show ga
Tregs can contribute to tumor progression by suppressing antitumor immunity.
Exceptionally, in human colorectal cancer (CRC), Tregs are thought to exert
beneficial roles in controlling pro-tumor chronic inflammation. The goal of our
study was to characterize CRC-infiltrating Tregs at multiple levels, by
phenotypical, molecular and functional evaluation of Tregs from the tumor site,
compared to non-tumoral mucosa and peripheral blood of CRC patients. The
frequency of Tregs was higher in mucosa than in blood, and further significantly
increased in tumor. Ex vivo, those Tregs suppressed the proliferation of
tumor-infiltrating CD8(+) and CD4(+) T cells. A differential compartmentalization
was detected between Helios(high) and Helios(low) Treg subsets (thymus-derived
versus peripherally induced): while Helios(low) Tregs were enriched in both
sites, only Helios(high) Tregs accumulated significantly and specifically in
tumors, displayed a highly demethylated TSDR region and contained high
proportions of cells expressing CD39 and OX40, markers of activation and
suppression. Besides the suppression of T cells, Tregs may contribute to CRC
progression also through releasing IL-17, or differentiating into Tfr cells that
potentially antagonize a protective Tfh response, events that were both detected
in tumor-associated Tregs. Overall, our data indicate that Treg accumulation may
contribute through multiple mechanisms to CRC establishment and progression.