کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3257974 1207435 2008 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ag-specific type 1 CD8 effector cells enhance methotrexate-mediated antitumor responses by modulating differentiated T cell localization, activation and chemokine production in established breast cancer
موضوعات مرتبط
علوم زیستی و بیوفناوری ایمنی شناسی و میکروب شناسی ایمونولوژی
پیش نمایش صفحه اول مقاله
Ag-specific type 1 CD8 effector cells enhance methotrexate-mediated antitumor responses by modulating differentiated T cell localization, activation and chemokine production in established breast cancer
چکیده انگلیسی

The chemotherapeutic agent methotrexate is widely used in the treatment of breast cancer. Although its mechanism-of-action has been defined, less is known about its interaction with T cell-mediated antitumor responses. Type 1 CD8 T cell-mediated immune responses (Tc1) are cytolytic, produce IFN-gamma and are associated with effective antitumor responses. Using a murine transgenic TCR tumor model, we show that single-dose treatment with methotrexate enhanced CD8-mediated type 1 antitumor responses when administered 3 days prior to Tc1 effector cell transfer. Co-treatment with methotrexate not only enhanced donor Tc1 cell accumulation and persistence at sites of primary tumor growth, but also promoted elevated levels of activated donor TIL cells. This markedly enhanced the appearance of endogenous differentiated (CD44High) CD8 tumor-infiltrating cells when compared to that of corresponding groups receiving either MTX or Tc1 cell transfer alone. Such cells were acutely activated as defined by co-expression of surface markers associated with TCR engagement (CD69) and T cell activation (CD25) at both early (days 1–8) and late (days 12–20) stages following treatment. Conversely, such animals showed an early decrease in CD4+/CD44High/CD25+/CD69+ T cells that correlated with delays in tumor growth in vivo. Moreover, cellular response kinetics appeared to further correlate with the up-regulation of endogenous T cells producing the chemokine IP-10 in vivo. This suggested that Tc1 cell transfer, in combination with chemotherapy, can enhance antitumor responses by modulating immunoregulatory T cells involved in homeostasis and immune tolerance within the tumor environment. These studies offer insight into mechanisms that enhance T cell-based immunotherapy in cancer.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Clinical Immunology - Volume 128, Issue 2, August 2008, Pages 205–218
نویسندگان
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