The invention belongs to the technical field of bioengineering, and particularly relates to an IL-12-CD137 chimeric
protein, a function-enhanced engineered NK
cell, and preparation and application thereof. The IL-12-CD137 chimeric
protein comprises a
signal peptide, an IL-12a
protein molecule, a CD137 transmembrane structural domain and a CD137
intracellular structural domain, and has an
amino acid sequence as shown in SEQ ID NO: 1. According to the function-enhanced engineered NK
cell, the IL-12-CD137 chimeric protein sequence is introduced into an original NK
cell, the function-enhanced engineered NK cell expressing Chime-IL12-CD137 is obtained, the amplification capacity and killing capacity of the NK cell can be enhanced, and the function-enhanced engineered NK cell is applied to treatment of tumor and
virus-infected diseases of companion animals for the first time.