Enzyme- Responsive Intracellular- Controlled Release Using Silica Mesoporous Nanoparticles Capped with e- Poly- l- lysine

Autor: L. MONDRAGON, N. MAS, V. FERRAGUD, C. DE LA TORRE, A. AGOSTINI, R. MARTINEZ-MANEZ, F. SANCENON, P. AMOROS, E. PEREZ-PAYA, M. ORZAEZ
Rok vydání: 2014
Předmět:
Zdroj: CHEMISTRY-A EUROPEAN JOURNAL
r-CIPF: Repositorio Institucional Producción Científica del Centro de Investigación Principe Felipe (CIPF)
Centro de Investigación Principe Felipe (CIPF)
r-CIPF. Repositorio Institucional Producción Científica del Centro de Investigación Principe Felipe (CIPF)
instname
ISSN: 0947-6539
Popis: The synthesis and characterization of two new capped silica mesoporous nanoparticles for controlled delivery purposes are described. Capped hybrid systems consist of MCM-41 nanoparticles functionalized on the outer surface with polymer epsilon-poly-L-lysine by two different anchoring strategies. In both cases, nanoparticles were loaded with model dye molecule [Ru(bipy)(3)](2+). An anchoring strategy involved the random formation of urea bonds by the treatment of propyl isocyanate-functionalized MCM-41 nanoparticles with the lysine amino groups located on the epsilon-poly-L-lysine backbone (solid Ru-rLys-S1). The second strategy involved a specific attachment through the carboxyl terminus of the polypeptide with azidopropyl-functionalized MCM-41 nanoparticles (solid Ru-tLys-S1). Once synthesized, both nanoparticles showed a nearly zero cargo release in water due to the coverage of the nanoparticle surface by polymer epsilon-poly-L-lysine. In contrast, a remarkable payload delivery was observed in the presence of proteases due to the hydrolysis of the polymer's amide bonds. Once chemically characterized, studies of the viability and the lysosomal enzyme-controlled release of the dye in intracellular media were carried out. Finally, the possibility of using these materials as drug-delivery systems was tested by preparing the corresponding epsilon-poly-L-lysine capped mesoporous silica nanoparticles loaded with cytotoxic drug camptothecin (CPT), CPT-rLys-S1 and CPT-tLys-S1. Cellular uptake and cell-death induction were studied. The efficiency of both nanoparticles as new potential platforms for cancer treatment was demonstrated.
Databáze: OpenAIRE
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