Folate-associated lipoplexes mediate efficient gene delivery and potent antitumoral activity in vitro and in vivo

• Published in: International journal of pharmaceutics Vol. 423; no. 2; pp. 365 - 377
• Main Authors: Duarte, Sónia, Faneca, Henrique, Lima, Maria C. Pedroso de
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 28.02.2012
• Subjects: Animal models; Animals; Antitumoral activity; Carcinoma, Squamous Cell - genetics; Carcinoma, Squamous Cell - metabolism; Carcinoma, Squamous Cell - pathology; Carcinoma, Squamous Cell - therapy; Cationic liposomes; Cell Cycle; Cell Line, Tumor; Cell Survival; Cholesterol; Cholesterol - chemistry; Connexin 43 - metabolism; DNA; DNA - chemistry; DNA - metabolism; Expression vectors; Female; Folate Receptors, GPI-Anchored - metabolism; Folate-associated lipoplexes; Folic acid; Folic Acid - chemistry; Folic Acid - metabolism; Gene delivery; Gene therapy; Gene transfer; Genes, Reporter; Genes, Transgenic, Suicide; Genetic Therapy - methods; Lipids; Liposomes; Mice; Mice, Inbred C3H; Mouth Neoplasms - genetics; Mouth Neoplasms - metabolism; Mouth Neoplasms - pathology; Mouth Neoplasms - therapy; neoplasms; nucleic acids; Phosphatidylcholines - chemistry; Solid tumors; Suicide gene therapy; suicide genes; Thymidine Kinase - biosynthesis; Thymidine Kinase - genetics; Time Factors; Transfection; Transfection - methods; Tumor cell lines; Tumors; Viral Proteins - biosynthesis; Viral Proteins - genetics; Suicide gene therapy; Gene delivery; Chol; SCC-VII; TSA; Cationic liposomes; EPOPC; FA; Folate-associated lipoplexes; VGCV; Antitumoral activity
• ISSN: 0378-5173; 1873-3476
• DOI: 10.1016/j.ijpharm.2011.12.035

The lack of suitable vectors for efficient nucleic acid delivery into target cells represents a major hurdle for the successful application of gene therapy. Cationic liposomes exhibit attractive features for gene delivery, but their efficacy is still unsatisfactory, particularly for in vivo applications, which justifies the drive to further improve their performance by developing novel and efficient formulations. In the present study, we generated a new formulation of lipoplexes through electrostatic association of folate (FA) to 1-palmitoyl-2-oleoyl-sn-glycero-3-ethylphosphocholine (EPOPC):cholesterol (Chol) liposomes, prepared at different lipid/DNA charge ratios, and explored their potential to mediate gene delivery. The optimal FA-lipoplex formulation was evaluated for its efficacy to mediate antitumoral activity upon application of HSV-tk suicide gene therapy, both in vitro and in an animal model of oral cancer. Our results demonstrate that FA-EPOPC:Chol/DNA lipoplexes were able to promote a great enhancement of transfection and high in vitro antitumoral activity compared to plain lipoplexes in two different cancer cell lines. Most importantly, a considerable reduction of tumor growth was achieved with the developed FA-lipoplexes as compared to that observed for control FA-lipoplexes or plain lipoplexes. Overall, our study shows that FA-EPOPC:Chol/DNA lipoplexes constitute a promising system for the successful application of suicide gene therapy aiming at treating solid tumors.