Abstract
Tumor-induced T-cell tolerance is a major mechanism that facilitates tumor progression and limits the efficacy of immune therapeutic interventions. Regulatory T cells (Treg) play a central role in the induction of tolerance to tumor antigens, yet the precise mechanisms regulating its induction in vivo remain to be elucidated. Using the A20 B-cell lymphoma model, here we identify myeloid-derived suppressor cells (MDSC) as the tolerogenic antigen presenting cells capable of antigen uptake and presentation to tumor-specific Tregs. MDSC-mediated Treg induction requires arginase but is transforming growth factor-β independent. In vitro and in vivo inhibition of MDSC function, respectively, with NOHA or sildenafil abrogates Treg proliferation and tumor-induced tolerance in antigen-specific T cells. These findings establish a role for MDSCs in antigen-specific tolerance induction through preferential antigen uptake mediating the recruitment and expansion of Tregs. Furthermore, therapeutic interventions, such as in vivo phosphodiesterase 5-inhibition, which effectively abrogate the immunosuppressive role of MDSCs and reduce Treg numbers, may play a critical role in delaying and/or reversing tolerance induction.
| Original language | English |
|---|---|
| Pages (from-to) | 5439-5449 |
| Number of pages | 11 |
| Journal | Cancer Research |
| Volume | 68 |
| Issue number | 13 |
| DOIs | |
| State | Published - Jul 1 2008 |
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ASJC Scopus subject areas
- Cancer Research
- Oncology
Cite this
Myeloid-derived suppressor cells promote cross-tolerance in B-cell lymphoma by expanding regulatory T cells. / Serafini, Paolo; Mgebroff, Stephanie; Noonan, Kimberly; Borrello, Ivan.
In: Cancer Research, Vol. 68, No. 13, 01.07.2008, p. 5439-5449.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Myeloid-derived suppressor cells promote cross-tolerance in B-cell lymphoma by expanding regulatory T cells
AU - Serafini, Paolo
AU - Mgebroff, Stephanie
AU - Noonan, Kimberly
AU - Borrello, Ivan
PY - 2008/7/1
Y1 - 2008/7/1
N2 - Tumor-induced T-cell tolerance is a major mechanism that facilitates tumor progression and limits the efficacy of immune therapeutic interventions. Regulatory T cells (Treg) play a central role in the induction of tolerance to tumor antigens, yet the precise mechanisms regulating its induction in vivo remain to be elucidated. Using the A20 B-cell lymphoma model, here we identify myeloid-derived suppressor cells (MDSC) as the tolerogenic antigen presenting cells capable of antigen uptake and presentation to tumor-specific Tregs. MDSC-mediated Treg induction requires arginase but is transforming growth factor-β independent. In vitro and in vivo inhibition of MDSC function, respectively, with NOHA or sildenafil abrogates Treg proliferation and tumor-induced tolerance in antigen-specific T cells. These findings establish a role for MDSCs in antigen-specific tolerance induction through preferential antigen uptake mediating the recruitment and expansion of Tregs. Furthermore, therapeutic interventions, such as in vivo phosphodiesterase 5-inhibition, which effectively abrogate the immunosuppressive role of MDSCs and reduce Treg numbers, may play a critical role in delaying and/or reversing tolerance induction.
AB - Tumor-induced T-cell tolerance is a major mechanism that facilitates tumor progression and limits the efficacy of immune therapeutic interventions. Regulatory T cells (Treg) play a central role in the induction of tolerance to tumor antigens, yet the precise mechanisms regulating its induction in vivo remain to be elucidated. Using the A20 B-cell lymphoma model, here we identify myeloid-derived suppressor cells (MDSC) as the tolerogenic antigen presenting cells capable of antigen uptake and presentation to tumor-specific Tregs. MDSC-mediated Treg induction requires arginase but is transforming growth factor-β independent. In vitro and in vivo inhibition of MDSC function, respectively, with NOHA or sildenafil abrogates Treg proliferation and tumor-induced tolerance in antigen-specific T cells. These findings establish a role for MDSCs in antigen-specific tolerance induction through preferential antigen uptake mediating the recruitment and expansion of Tregs. Furthermore, therapeutic interventions, such as in vivo phosphodiesterase 5-inhibition, which effectively abrogate the immunosuppressive role of MDSCs and reduce Treg numbers, may play a critical role in delaying and/or reversing tolerance induction.
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UR - http://www.scopus.com/inward/citedby.url?scp=48549085973&partnerID=8YFLogxK
U2 - 10.1158/0008-5472.CAN-07-6621
DO - 10.1158/0008-5472.CAN-07-6621
M3 - Article
C2 - 18593947
AN - SCOPUS:48549085973
VL - 68
SP - 5439
EP - 5449
JO - Journal of Cancer Research
JF - Journal of Cancer Research
SN - 0099-7013
IS - 13
ER -