Gastrointestinal gene delivery by cyclodextrins--in vitro quantification of extracellular barriers.
Int J Pharm
; 456(2): 390-9, 2013 Nov 18.
Article
en En
| MEDLINE
| ID: mdl-24016741
Local gene delivery represents a promising therapeutic approach for diseases of the intestine. However, the gastrointestinal tract poses significant challenges to successful gene delivery. Cyclodextrins (CDs) have been extensively investigated as non-viral vectors. Here, we assessed the suitability of an amphiphilic cationic CD for intestinal gene transfer, with particular focus on extracellular barriers. Stability and transfection efficiency of CD·DNA complexes were assessed post incubation in simulated gastric and intestinal fluids, bile salts and mucin, or with intestinal enzymes to represent extracellular barriers to intestinal gene delivery. Stability was determined by gel electrophoresis and transfection was measured by luciferase expression in intestinal epithelial cells (Caco-2). Transfection efficiency of CD·DNA complexes was enhanced after incubation in bile salts but was reduced after incubation in gastric and intestinal fluids and mucin. CD·DNA complexes were stable after incubation with pancreatic enzymes and with a model lower intestinal enzyme. Furthermore, the CD protected pDNA from degradation by DNase. In summary, physiologically relevant in vitro models were established and used to quantify the barriers posed by the intestinal extracellular environment to gene delivery. This systematic assessment identified the advantages and limitations of the CD vector and facilitated the proposal of formulation strategies to overcome these barriers.
Palabras clave
3-(4,5dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide; CD; CMV; Cyclodextrins; DMEM; DNase I; Dulbecco's Modified Eagle's Medium; FBS; FaSSGF; FaSSIF; GDV; GI; Gene delivery; Intestinal barriers; Lf2000; Lipofectamine™ 2000; MTT; NaTC; Non-viral vectors; PBS; RLU; SDS; SIF; Stability; cyclodextrin; cytomegalovirus; deoxyribonuclease I; fasted simulated state gastric fluid; fasted simulated state intestinal fluid; foetal bovine serum; gastrointestinal; gene delivery vector; phosphate buffered saline; relative luminescence units; simulated intestinal fluid; sodium dodecyl sulphate; sodium taurocholate
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Técnicas de Transferencia de Gen
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Ciclodextrinas
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Tracto Gastrointestinal
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Líquido Extracelular
Límite:
Animals
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Humans
Idioma:
En
Revista:
Int J Pharm
Año:
2013
Tipo del documento:
Article
País de afiliación:
Irlanda