Instituto de Investigacion Sanitaria Hospital 12 de Octubre (imas12) 1 article published in JoVE Immunology and Infection An In Vivo Mouse Model to Measure Naïve CD4 T Cell Activation, Proliferation and Th1 Differentiation Induced by Bone Marrow-derived Dendritic Cells Raquel Toribio-Fernandez1, Virginia Zorita1, Beatriz Herrero-Fernandez2, Jose M. Gonzalez-Granado1,2,3 1LamImSys Lab, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), 2LamImSys Lab, Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), 3CIBER de Enfermedades Cardiovasculares Here, we present a protocol for the in vivo determination of naïve CD4 T cell (T cell) activation, proliferation, and Th1 differentiation induced by GM-CSF bone marrow (BM)-derived dendritic cells (DCs). In addition, this protocol describes BM and T-cell isolation, DC generation, and DC and T-cell adoptive transfer.