A novel HLA-DR alpha 1-MOG-35-55 construct treats experimental stroke

作者：Benedek Gil; Zhu Wenbin; Libal Nicole; Casper Amanda; Yu Xiaolin; Meza Romero Roberto; Vandenbark Arthur A; Alkayed Nabil J; Offner Halina^*

来源：Metabolic Brain Disease, 2014, 29(1): 37-45.

DOI：10.1007/s11011-013-9440-0

• Stroke
• Inflammation
• Immunotherapy
• Recombinant T-cell receptor Ligand
• MHC class II invariant chain

Chemoattraction of leukocytes into the brain after induction of middle cerebral artery occlusion (MCAO) increases the lesion size and worsens disease outcome. Our previous studies demonstrated that partial MHC class II constructs can reverse this process. However, the potential application of pMHC to human stroke is limited by the need to rapidly match recipient MHC class II with the beta 1 domain of the pMHC construct. We designed a novel recombinant protein comprised of the HLA-DR alpha 1 domain linked to MOG-35-55 peptide but lacking the beta 1 domain found in pMHC and treated MCAO after 4 h reperfusion in humanized DR2 mice. Infarct volumes were quantified after 96 h reperfusion and immune cells from the periphery and CNS were evaluated for expression of CD74 and other cell surface, cytokine and pathway markers. This study demonstrates that four daily treatments with DR alpha 1-MOG-35-55 reduced infarct size by 40 % in the cortex, striatum and hemisphere, inhibited the migration of activated CD11b(+)CD45(high) cells from the periphery to the brain and reversed splenic atrophy. Furthermore, DR alpha 1-MOG-35-55 bound to CD74 on monocytes and blocked both binding and downstream signaling of macrophage migration inhibition factor (MIF) that may play a key role in infarct development. The novel DR alpha 1-MOG-35-55 construct is highly therapeutic in experimental stroke and could be given to all patients at least 4 h after stroke onset without the need for tissue typing due to universal expression of DR alpha 1 in humans.

• 出版日期2014-3