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- W2091444400 abstract "We have shown that adoptive transfer of tumor-sensitized lymphocytes activated in vitro with bryostatin-1 and ionomycin (B/I), and expanded in culture, can induce regression of small established tumors. We set out to determine whether similar treatment would be effective against larger tumors and what cells mediate this effect. We also attempted to shorten the ex vivo culture period with the ultimate aim of developing a more clinically useful protocol. BALB/c mice were injected in one footpad with IL-2-transfected 4T07 mammary tumor cells. Ten days later, popliteal draining lymph nodes (DLN) were harvested and activated with B/I for 18 h. Mice with either 3-day or 10-day 4T07 flank tumors were treated with cyclophosphamide (100 mg/ kg ip, CYP) alone or CYP followed the next day by infusion of either B/I-activated lymphocytes transferred immediately or activated cells that had been expanded in vitro for 3 or 10 days. In some experiments, mice were also treated with rat anti-mouse CD4 monoclonal antibody (GK1.5) or anti-CD8 antibody (2.43). All mice receiving CYP alone or CYP + sensitized, nonactivated DLN cells demonstrated progressive tumor growth. One hundred percent (6/6) of mice treated with CYP + AIT with B/I-activated,10-day expanded cells had complete regression of 3-day flank tumors. Treatment with activated, nonexpanded cells, induced tumor regression in a majority of mice, but was not as reliable as AIT with expanded cells. We developed a protocol with a shortened expansion period (3-day) that was efficacious for treatment of 4T07 when adoptively transferred to either 3 or 10 day tumor-bearing mice. In vivo depletion of CD4(+) cells had no effect on regression of 3-day tumors, but treatment with anti-CD8 antibody abrogated the effect of immunotherapy. Adoptive transfer of B/I-activated cells, with or without long-term expansion, induced regression of early and late stage 4T07 tumors and is dependent on CD8(+) but not CD4(+) T cells." @default.
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- W2091444400 date "2001-06-01" @default.
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- W2091444400 title "Bryostatin/Ionomycin-Activated T Cells Mediate Regression of Established Tumors" @default.
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- W2091444400 doi "https://doi.org/10.1006/jsre.2001.6181" @default.
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