Transitional cell carcinoma (TCC) represents the most frequent type of bladder cancer. Recently, studies have focused on molecular tumor classifications in order to diagnose tumor subtypes and predict future clinical behavior. Increased expression of HER1 and HER2 receptors in TTC is related to advanced stage tumors. Lapatinib is an important alternative to treat tumors that presents this phenotype due to its ability to inhibit tyrosine kinase residues associated with HER1 and HER2 receptors. This study evaluated the cytotoxicity induced by LAP-loaded nanocapsules (NC-LAP) compared to LAP in HER-positive bladder cancer cell. The cytotoxicity induced by NC-LAP was evaluated through flow cytometry, clonogenic assay and RT-PCR. NC-LAP at 5 μM reduced the cell viability and was able to induce G0/G1 cell cycle arrest with up-regulation of p21. Moreover, NC-LAP treatment presented significantly higher apoptotic rates than untreated cells and cells incubated with drug-unloaded nanocapsules (NC) and an increase in Bax/Bcl-2 ratio was observed in T24 cell line. Furthermore, clonogenic assay demonstrated that NC-LAP treatment eliminated almost all cells with clonogenic capacity. In conclusion, NC-LAP demonstrate antitumoral effect in HER-positive bladder cells by inducing cell cycle arrest and apoptosis exhibiting better effects compared to the non-encapsulated lapatinib. Our work suggests that the LAP loaded in nanoformulations could be a promising approach to treat tumors that presents EGFR overexpression phenotype.
The data presented here are related to the research paper entitled “PCL-b-P(MMA-co-DMAEMA)2 new triblock copolymer for novel pH-sensitive nanocapsules intended for drug delivery to tumors” by Franco et al. [1]. Characterization data of PCL-diol, macroinitiator Br-PCL-Br, homopolymers (PMMA and PDMAEMA) and copolymers (batch 1 and batch 2) analyzed by FTIR, SEC and NMR, as well as, characterization of PCL-NS formulation by laser diffraction and DLS analysis, initial nanocapsule formulations and 1C-NC and 2C-NC formulations, including hydrodynamic diameter at different pH media, and DMSO cytotoxicity.
<p class="ResumoRevista">Este artigo sinaliza algumas das contribuições da Internet para a gestão e construção do conhecimento nos últimos 20 anos. Posteriormente é discutido como empresas privadas, especificamente o Google, tem determinado o modo pelo qual as pessoas tem acesso à vasta quantidade de informação disponível <em>online</em>. A invasão de privacidade e o fornecimento de resultados personalizados conforme o perfil de cada pessoa, também são tratados neste trabalho, bem como os riscos decorrentes disto. Por fim, são propostas algumas medidas para que os indivíduos não permaneçam presos a um ciclo de informações repetidas, e assim tenham acesso a conteúdos que antes não estariam ao seu alcance virtual.</p>
http://dx.doi.org/10.5007/1807-9288.2016v12n2p77Este artigo sinaliza algumas das contribuições da Internet para a gestão e construção do conhecimento nos últimos 20 anos. Posteriormente é discutido como empresas privadas, especificamente o Google, tem determinado o modo pelo qual as pessoas tem acesso à vasta quantidade de informação disponível online. A invasão de privacidade e o fornecimento de resultados personalizados conforme o perfil de cada pessoa, também são tratados neste trabalho, bem como os riscos decorrentes disto. Por fim, são propostas algumas medidas para que os indivíduos não permaneçam presos a um ciclo de informações repetidas, e assim tenham acesso a conteúdos que antes não estariam ao seu alcance virtual.
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