Efficient gene vector with size changeable and nucleus targeting in cancer therapy.

The nucleus is one of the most important cellular organelles, where gene encode and transcribe at that location. However, nucleus-targeting gene delivery are rare been reported. It is important to develop a high-efficiency nucleus-targeting gene vector that can deliver targeted gene into nucleus directly for destroy of cancer cells. Here, special nucleus-targeting and size changeable deliver system based on TAT-SS-PAMAM-D3 with TAT functional on the surface and disulfide linked between D2 and D3 is designed to perform highly efficient nucleus-targeting gene delivery for effective cancer cell killing in vitro. CLSM observations reveal that more TAT-SS-PAMAM-D3 are enter into the nucleus when compare to SS-PAMAM-D3. The TAT modified vector can also act as gene deliver to reach high gene transfection efficiencies, high apoptosis and low viability in HeLa cells. This TAT functionalized and disulfide linking in the carrier may become a prospective vector for cancer gene treatment and also offered a different strategy for designing a better gene delivery system.