Abstract: A combination of two recombinant adeno-associated viral (rAAV) vectors comprising in the first a capsid and a cassette comprising a 5? ITR sequence, a liver-specific promotor, a nucleic acid sequence coding for a transgene of interest useful to be tolerated by the immune system and a poly A chain and in the second a capsid and a cassette comprising a 5? ITR sequence, a promotor specific for a tissue of interest, a nucleic acid sequence corresponding to the nucleic acid sequence inserted into the cassette of the first rAAV vector, a transmembrane sequence, a poly A chain, wherein the nucleic acid sequences is administered towards to the tissue of interest, is disclosed. Said combination can be used in inducing an immune tolerance to a protein product encoded, and so be used as a drug in a subject, particularly for treating muscular dystrophies. Pharmaceutical compositions, kits and methods are also disclosed.

Abstract: A pharmaceutical composition comprising CD4+ CD25+ regulatory T cells specific for at least one minor histocompatibility antigen, and stem cells, advantageously haematopoietic, carrying at least the antigen can be used as a medicament for increasing the immune tolerance of a histocompatible host.