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• W2308367073 endingPage "2618" @default.
• W2308367073 startingPage "2607" @default.
• W2308367073 abstract "We have developed an in vitro system in which C57BL/6 donor splenocytes are exposed to B10.BR host alloantigens in the context of deficient CD28:B7 signaling as a means of preventing graft-versus-host disease (GVHD). Although 54% to 82% of MLR alloresponse was inhibited by cytotoxic T-lymphocyte antigen 4 (CTLA4)-Ig treatment of host stimulator cells, treated splenocytes were still capable of causing GVHD when infused in vivo. By adding anti-leukocyte function antigen 1 (anti-LFA1) antibody to hCTLA4-Ig in vitro to coblock the LFA1:intercellular adhesion molecule (ICAM) signaling, splenic alloresponse was inhibited by > or = 89%, yet GVHD induction capabilities were retained. Because antigen-primed cells might be more susceptible to CD28:B7 blockade, we investigated whether hCTLA4-Ig alone, anti-LFA1 antibody alone, or the combination of both added to donor-antihost in vitro primed cells could reduce GVHD. To facilitate hyporesponsiveness induction and to block B7 and ICAM ligands that are upregulated during GVHD, these reagents were also administered to recipients post-BMT. We have shown that hCTLA4-Ig plus anti-LFA1 antibody is highly effective in preventing GVHD-induced lethality (88% to 100% of treated mice surviving versus 0% to 28% of controls surviving). For optimal prevention, both hCTLA4-Ig and anti-LFA1 must be used in vitro in the context of donor-antihost primed splenocytes and continued in vivo. This in vitro-in vivo combined approach was associated with donor engraftment, and recipients were not globally immunosuppressed. We conclude that blocking both the CD28/B7 and the LFA1:ICAM pathways are critical to effective GVHD prevention and may offer advantages to in vitro donor T-cell removal." @default.
• W2308367073 created "2016-06-24" @default.
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• W2308367073 date "1995-05-01" @default.
• W2308367073 modified "2023-10-02" @default.
• W2308367073 title "Coblockade of the LFA1:ICAM and CD28/CTLA4:B7 pathways is a highly effective means of preventing acute lethal graft-versus-host disease induced by fully major histocompatibility complex-disparate donor grafts" @default.
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• W2308367073 doi "https://doi.org/10.1182/blood.v85.9.2607.bloodjournal8592607" @default.
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