Venâncio JH, Andrade LM, Esteves NLS, Brito LB, Valadares MC, Oliveira GAR, Lima EM, Marreto RN, Gratieri T, Taveira SF. Topotecan-loaded lipid nanoparticles as a viable tool for the topical treatment of skin cancers.
ACTA ACUST UNITED AC 2017;
69:1318-1326. [PMID:
28703281 DOI:
10.1111/jphp.12772]
[Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 05/13/2017] [Indexed: 11/30/2022]
Abstract
OBJECTIVES
This work aimed to evaluate semisolid formulations containing topotecan (TPT) loaded nanostructured lipid carriers (NLC) for topical treatment of skin cancers, as TPT is effective against a variety of tumours. A formulation which increases TPT skin permeation would be extremely desirable.
METHODS
TPT-NLC were prepared and incorporated in hydrogels with hydroxyethyl cellulose and chitosan (TPT-NLC-HEC and TPT-NLC-Ch, respectively). Control formulations were obtained by dispersing TPT in HEC and Ch hydrogels (TPT-HEC and TPT-Ch).
KEY FINDINGS
TPT-NLC-HEC and TPT-NLC-Ch showed to maintain the drug and nanoparticle dispersions stable for up to 30 days. When nanoparticles were incorporated into gels, TPT release was significantly decreased (P < 0.05). Still, TPT-NLC-HEC increased 2.37 times permeation compared with TPT-HEC (11.9 and 5.0 μg/cm2 , respectively). Cell culture experiments with B16F10 melanoma demonstrated that nanoencapsulation significantly increased TPT cytotoxicity (P < 0.05). TPT-NLC was more toxic than free TPT, with IC50 value of 5.74 μg/ml, whereas free TPT had an IC50 > 20 μg/ml. As skin permeated values of TPT from developed formulation (TPT-NLC) were superior to melanoma IC50, it can be extrapolated that chemotherapeutic permeated amounts may be sufficient for a therapeutic effect.
CONCLUSIONS
TPT-NLC-HEC may be a valuable tool for the topical treatment of skin cancers.
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