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|Title:||Potent enhancement of transdermal absorption and stability of human tyrosinase plasmid (pAH7/Tyr) by Tat peptide and an entrapment in elastic cationic niosomes|
Rolf G. Werner
|Keywords:||Pharmacology, Toxicology and Pharmaceutics|
|Abstract:||Enhancement of transdermal absorption through rat skin and stability of the human tyrosinase plasmid (P) using Tat (T) and an entrapment in elastic cationic niosomes (E) were described. E (Tween61:cholesterol:DDAB at 1:1:0.5 molar ratio) were prepared by the freeze-dried empty liposomes (FDELs) method using 25% ethanol. TP was prepared by a simple mixing method. TPE was prepared by loading T and P in E at the T:P:E ratio of 0.5:1:160 w/w/w. For gel formulations, P, TP, PE and TPE were incorporated into Carbopol 980 gel (30 g of plasmid per 1 g of gel). For the transdermal absorption studies, the highest cumulative amounts and fluxes of the plasmid in viable epidermis and dermis (VED) were observed from the TPE of 0.31 ± 0.04 g/cm and 1.86 ± 0.24 g/cm/h (TPE solution); and 4.29 ± 0.40 g/cm and 25.73 ± 2.40 g/cm/h (TPE gel), respectively. Only plasmid from the PE and TPE could be found in the receiving solution with the cumulative amounts and fluxes at 6 h of 0.07 ± 0.01 g/cm and 0.40 ± 0.08 g/cm/h (PE solution); 0.10 ± 0.01 g/cm and 0.60 ± 0.06 g/cm/h (TPE solution); 0.88 ± 0.03 g/cm and 5.30 ± 0.15 g/cm/h (PE gel); and 1.02 ± 0.05 g/cm and 6.13 ± 0.28 g/cm/h (TPE gel), respectively. In stability studies, the plasmid still remained at 4 ± 2 °C and 25 ± 2 °C of about 48.00-65.20% and 27.40-51.10% (solution); and 12.34-38.31% and 8.63-36.10% (gel), respectively, whereas at 45 ± 2 °C, almost all the plasmid was degraded. These studies indicated the high potential application of Tat and an entrapment in elastic cationic niosomes for the development of transdermal gene delivery system. © 2013 Informa Healthcare USA, Inc.|
|Appears in Collections:||CMUL: Journal Articles|
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