Solid lipid nanoparticles induced hematological changes and inflammatory response in mice.

Solid lipid nanoparticles (SLNs) are an alternative drug delivery system compared to emulsions, liposomes and polymeric nanoparticles. Due to their unique sizes and properties, SLNs offer possibility to develop new therapeutic approaches. The ability to incorporate drugs into nanocarriers offers a new prototype in drug delivery that could be used for drug targeting. However, toxicity of these new formulations has not been investigated thus far. In this study, we carried out an in vivo toxicity study. For that mice were divided into three groups and treated intraperitoneally with triestearin-based SLNs (TN), natural wax-based SLNs (VN) or vehicle for 10 days. After that, necropsies, histopathological and hematological analysis, as well as hepatic and renal functions were performed. Our results indicated that both TN and VN were absorbed post-exposure and induced an inflammatory response in adipose tissue. However, histopathological analysis demonstrated the absence of toxicity in both treated groups. In addition, the body weights were similar among the groups and low toxicity was also indicated by the unchanged serum biochemical parameters. This study provides a preliminary data for toxicological studies of two different SLNs in long-term in vivo exposure. However, further studies should be conducted in order to investigate the inflammatory response in order to establish the safety of these SLNs.

In vitro and in vivo effects of free and chalcones-loaded nanoemulsions: insights and challenges in targeted cancer chemotherapies.

Several obstacles are encountered in conventional chemotherapy, such as drug toxicity and poor stability. Nanotechnology is envisioned as a strategy to overcome these effects and to improve anticancer therapy. Nanoemulsions comprise submicron emulsions composed of biocompatible lipids, and present a large surface area revealing interesting physical properties. Chalcones are flavonoid precursors, and have been studied as cytotoxic drugs for leukemia cells that induce cell death by different apoptosis pathways. In this study, we encapsulated chalcones in a nanoemulsion and compared their effect with the respective free compounds in leukemia and in non-tumoral cell lines, as well as in an in vivo model. Free and loaded-nanoemulsion chalcones induced a similar anti-leukemic effect. Free chalcones induced higher toxicity in VERO cells than chalcones-loaded nanoemulsions. Similar results were observed in vivo. Free chalcones induced a reduction in weight gain and liver injuries, evidenced by oxidative stress, as well as an inflammatory response. Considering the high toxicity and the side effects induced generally by all cancer chemotherapies, nanotechnology provides some options for improving patients' life quality and/or increasing survival rates.