The present invention discloses nano switch molecules and activation control
solid tumor targeted CAR-T cells thereof. The
solid tumor targeted CAR-T cells are prepared by the following steps of 1) preparing the nano switch molecules, wherein switch molecules are loaded on
tumor targeted nanoparticles by adopting a double emulsification-volatilization method; 2) constructing assembled CAR-T plasmids, wherein T2A elements, FRB and
FKBP sequences and
solid tumor targeted ScFv fragments are introduced in CAR-T plasmids by using a
genetic recombination method; 3) preparing assembled CAR-T cells, wherein the assembled CAR-T plasmids are transfected with T lymphocytes; and 4) preparing the
solid tumor targeted CAR-T cells, wherein the assembled CAR-T cells endocytose the nano switch molecules. The switch molecules are loaded on the tumor
targeted nanoparticles, so that the switch molecules can be specifically gathered on the tumor tissues; and
FKBP and FRAP of CAR-T are connected by the switch molecules, so that two parts of CAR-T are combined to have the
attack activity, and the problem of CAR-
T cell off-target effect can be solved fundamentally.