High gene transfer by the osmotic polysorbitol-mediated transporter through the selective caveolae endocytic pathway.
Cationic polymers have been the subject of intense research as nonviral gene delivery systems due to several advantages in comparison with viral vectors. However, the nonsimultaneous combination of high transfection efficiency and low cytotoxicity of nonviral vectors for gene delivery has long been an issue for scientists looking into ways to deliver genes into cells. Toward this goal, we designed, synthesized, and evaluated a safe and accelerated gene transfer system through polysorbitol-mediated transporter (PSMT) based on sorbitol diacrylate (SDA) and low molecular weight polyethylenimine (LMW PEI). The PSMT formed stable complexes with plasmid DNA in serum. The nano sizes and spherical shapes of PSMT/DNA complexes are not toxic, even at a high concentration of PSMT. The higher transfection efficiency of PSMT compared to PEI 25K was observed both in vitro, despite the existence of many hydroxyl groups, and in vivo. These improvements presumably stem from the osmotic property of polysorbitol and endosomal buffer capacity of PEI in PSMT. Most importantly, we confirmed that the selective cavaeolae endocytic pathway played a role in high transfection efficiency by osmotic PSMT-mediated gene delivery. We propose that PSMT is a promising nonviral carrier for the effective gene delivery to cancer cells via synergistic effects derived from rapid cellular uptake through the caveolae endocytic pathway and a high endosomal buffering capacity.
Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Republic of Korea.
Quynh-Phuong
QP
Luu
Ji-Young
JY
Shin
You-Kyoung
YK
Kim
Mohammad Ariful
MA
Islam
Sang-Kee
SK
Kang
Myung-Haing
MH
Cho
Yun-Jaie
YJ
Choi
Chong-Su
CS
Cho
D000818:Animals; D045744:Cell Line, Tumor; D004705:Endocytosis / Q000502:physiology*; D005434:Flow Cytometry; D018014:Gene Transfer Techniques; D006367:HeLa Cells; D006801:Humans; D008297:Male; D051379:Mice; D009995:Osmosis; D011091:Polyesters / Q000737:chemistry* / Q000378:metabolism*; D011094:Polyethyleneimine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D014162:Transfection / Q000379:methods*
D011091:Polyesters; C569756:polysorbitol-based osmotically active transporter polymer; D011094:Polyethyleneimine