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Recombinant T Cell Receptor Ligands Improve Outcome After Experimental Cerebral Ischemia

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Abstract

A key target for novel stroke therapy is the regulation of post-ischemic inflammatory mechanisms. Recent evidence emphasizes the role of T lymphocytes of differing subtypes in the evolution is ischemic brain damage. We have recently demonstrated the benefit of myelin antigen-specific immunodulatory agents known as recombinant T cell receptor ligands (RTLs) in a standard murine model of focal stroke. The aim of the current study was to extend this initial observation to RTL treatment in a therapeutically relevant timing after middle cerebral artery occlusion (MCAO) and verify functional benefit to complement histological outcome measures. We observed that the administration of mouse-specific RTL551 reduced infarct size and improved sensorimotor outcome when administered within a 3 h post-ischemic therapeutic window. RTL551 treatment reduced cortical, caudate putamen, and total infarct volume as compared to vehicle-treated mice. Using a standard behavioral testing repertoire, we observed that RTL551 reduced sensorimotor impairment 3 days after MCAO. Humanized RTL1000 (HLA-DR2 moiety linked to hMOG-35-55 peptide) also reduced infarct size in HLA-DR2 transgenic mice. These data indicate that this neuroantigen-specific immunomodulatory agent reduces damage when administered in a therapeutically relevant reperfusion timeframe.

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Acknowledgments

The authors thank Ms. Kathy Gage, grants and publications writer for the Department of Anesthesiology and Perioperative Medicine, OHSU, for her outstanding editorial work in the preparation of this paper. This material is based upon work supported in part by the Department of Veterans Affairs, Veterans Health Administration, Office of Research and Development, Biomedical Laboratory Research and Development. The contents do not represent the views of the Department of Veterans Affairs or the US government.

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Correspondence to Paco S. Herson.

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Akiyoshi, K., Dziennis, S., Palmateer, J. et al. Recombinant T Cell Receptor Ligands Improve Outcome After Experimental Cerebral Ischemia. Transl. Stroke Res. 2, 404–410 (2011). https://doi.org/10.1007/s12975-011-0085-1

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  • DOI: https://doi.org/10.1007/s12975-011-0085-1

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