Browsing by Author "Narvaez, Edgar"

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    Rapamycin-conditioned dendritic cells activated with monophosphoryl lipid A promote allograft acceptance in vivo
    (2015) Campos-Acuna, Javier; Perez, Francisco; Narvaez, Edgar; Campos-Mora, Mauricio; Gajardo, Tania; Catalan, Diego; Aguillon, Juan C.; Pino-Lagos, Karina
    Aim: To date, there is no human dendritic cell (DC) based therapy to prevent allograft rejection in transplanted patients. Here, we evaluate a potential protocol using a murine in vivo transplant model. Materials & methods: We generated murine bone marrow-derived DCs (BM-DCs), modulated with rapamycin (Rapa) and activated with monophosphoryl lipid A (Rapamycin-treated and monophosphoryl lipid A-matured DCs [Rapa-mDCs]). DCs phenotype was evaluated by flow cytometry, cytokine production by ELISA and their T-cell stimulatory ability was tested in co-cultures with CD4(+) T cells. Using an in vivo skin graft model, we evaluated DCs tolerogenicity. Results: In vitro, Rapa-mDCs exhibit a semi-mature phenotype given by intermediate levels of co-stimulatory molecules and cytokines, and inhibit CD4(+) T-cell proliferation. In vivo, skin-grafted mice treated with Rapa-mDCs show high allograft survival, accumulation of Foxp3(+) Tregs and cytokine pattern modification. Conclusion: Rapa-mDCs re-educate the inflammatory microenvironment, promoting skin-allograft survival.