期刊
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
卷 57, 期 4, 页码 1714-1722出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.01984-12
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资金
- Department of Biotechnology, Government of India, New Delhi, India [BT/PR2007/MED/29/311/2011]
- Indian Council of Medical Research, New Delhi, India
The accessible treatment options for life-threatening neglected visceral leishmaniasis (VL) disease have problems with efficacy, stability, adverse effects, and cost, making treatment a complex issue. Here we formulated nanometric amphotericin B (AmB)-encapsulated chitosan nanocapsules (CNC-AmB) using a polymer deposition technique mediated by nanoemulsion template fabrication. CNC-AmB exhibited good steric stability in vitro, where the chitosan content was found to be efficient at preventing destabilization in the presence of protein and Ca2+. A toxicity study on the model cell line J774A and erythrocytes revealed that CNC-AmB was less toxic than commercialized AmB formulations such as Fungizone and AmBisome. The results of in vitro (macrophage-amastigote system; 50% inhibitory concentration [IC50], 0.19 +/- 0.04 mu g AmB/ml) and in vivo (Leishmania donovani-infected hamsters; 86.1% +/- 2.08% parasite inhibition) experiments in conjunction with effective internalization by macrophages illustrated the efficacy of CNC-AmB at augmenting antileishmanial properties. Quantitative mRNA analysis by realtime PCR (RT-PCR) showed that the improved effect was synergized with the upregulation of tumor necrosis factor alpha (TNF-alpha), interleukin-12 (IL-12), and inducible nitric oxide synthase and with the downregulation of transforming growth factor beta (TGF-beta), IL-10, and IL-4. These research findings suggest that a cost-effective CNC-AmB immunoadjuvant chemotherapeutic delivery system could be a viable alternative to the current high-cost commercial lipid-based formulations.
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