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- W2895867783 abstract "Background and Purpose- Adoptive transfer of regulatory T cells (Tregs) protect against stroke; however, Treg-based therapy raises concerns in stroke patients with cancer because of the immunosuppressive function of Tregs. The purpose of this study was to investigate the role of Tregs in cerebral ischemic brain injury with concomitant cancer. Methods- To establish a cancer phenotype, MC38 colon cancer or B16 melanoma cells (5×105/mice) were injected subcutaneously into C57BL/6J mice 2 to 3 weeks before distal middle cerebral artery occlusion surgery. Infarct volume, neuroinflammation, and Tregs infiltration were measured by 2,3,5-triphenyltetrazolium chloride staining, immunofluorescence staining, real-time polymerase chain reaction, and flow cytometry. Mechanistically, Nrp1 (neuropilin-1) monoclonal antibody was used to block the Nrp1 effect on Tregs ex vivo before being transferred into recombination activating gene 1 (Rag1-/-) stroke mice, which are devoid of T and B cells, or a Nrp1 neutralization antibody was injected systemically into cancer-bearing wild-type mice after stroke. Results- Cancer-bearing mice with stroke exhibited augmented neuroinflammation and fewer Tregs in the brain, but more infiltration of Tregs to the tumor was apparent after distal middle cerebral artery occlusion. Depletion of Tregs increased infarct volume in stroke mice but did not further exacerbate brain injury in cancer-bearing stroke mice. Nrp1 blocking ex vivo or Nrp1 systemic neutralization attenuated ischemic brain injury and reversed accumulation of Tregs within tumor after stroke in cancer-bearing mice. Conclusions- Nrp1 signaling mediated accumulation of Tregs within tumor might play a critical role in exacerbating ischemic brain injury in cancer-bearing mice and may represent a promising immune modulatory target for the combined condition of cancer and stroke." @default.
- W2895867783 created "2018-10-26" @default.
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- W2895867783 date "2018-11-01" @default.
- W2895867783 modified "2023-10-12" @default.
- W2895867783 title "Cancer Exacerbates Ischemic Brain Injury Via Nrp1 (Neuropilin 1)-Mediated Accumulation of Regulatory T Cells Within the Tumor" @default.
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- W2895867783 doi "https://doi.org/10.1161/strokeaha.118.021948" @default.
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