Exogenous gitr ligand-expressing cells

The present invention, cells expressing exogenous GITRL or GITRL derivative, a method of manufacturing the cell, the therapeutic agent or prophylactic agent containing the cell as an active ingredient, in the manufacture of the cell of the therapeutic agent or prophylactic agent, the comprising administering cells to a subject, a viral vector comprising a gene encoding a GITRL or GITRL derivative, therapeutic agent or prophylactic agent containing the viral vector as an active ingredient, the therapeutic agent or prophylactic agent of the viral vector in the preparation, and a method comprising administering to the subject the virus vector is provided.