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The placenta has emerged as an attractive source of mesenchymal stem cells (MSCs) because of the absence of ethical issues, non-invasive access, and abundant yield. However, inflammatory cell invasion into grafts negatively impacts the survival and efficacy of transplanted cells. Previous studies have shown that synthetic C16 peptide can competitively block the transmigration of leukocytes into the central nerve system, while angiopoietin-1 (Ang-1) can inhibit inflammation-induced blood vessel leakage and inflammatory cell infiltration in rats with experimental allergic encephalomyelitis (EAE). In this study, we investigated the effects of intravenous administration of C16 and Ang-1 on the efficacy of placenta-derived MSC (PMSC) transplantation in a rat model of EAE. We found that, compared with PMSCs alone, treatment with PMSCs along with intravenously administered C16 and Ang-1 was more effective at ameliorating demyelination/neuronal loss and neurological dysfunction, reducing inflammatory cell infiltration, perivascular edema, and reactive astrogliosis (p < 0.05). Mechanistic studies revealed that intravenous C16 and Ang-1 increased PMSC engraftment in the central nervous system and promoted expression of the neurotropic proteins brain-derived neurotrophic factor, growth-associated protein 43, and p75 neurotrophin receptor as well as the neuronal-glial lineage markers neurofilament protein 200 and myelin basic protein in the engrafted PMSCs.

Intravenous C16 and angiopoietin-1 improve the efficacy of placenta-derived mesenchymal stem cell therapy for EAE