VANESSA JACOB VICTORINO
Projetos de Pesquisa
Unidades Organizacionais
LIM/51 - Laboratório de Emergências Clínicas, Hospital das Clínicas, Faculdade de Medicina
2 resultados
Resultados de Busca
Agora exibindo 1 - 2 de 2
- Systemic toxicity induced by paclitaxel in vivo is associated with the solvent cremophor EL through oxidative stress-driven mechanisms(2014) CAMPOS, Fernanda C.; VICTORINO, Vanessa J.; MARTINS-PINGE, Marli Cardoso; CECCHINI, Alessandra L.; PANIS, Carolina; CECCHINI, RubensThe toxic effects of paclitaxel (PTX) and its solubilizing agent cremophor EL (CREL) have been well established in vitro; however, the in vivo mechanisms underlying this toxicity remain unclear. Thus, the aim of this study was to analyze the in vivo toxicity induced by infusion of PTX and CREL and to investigate the involvement of oxidative stress as a potential mechanism for this toxicity. We treated male Wistar rats with PTX and/or CREL for 1 h using human-equivalent doses (PTX + CREL/ethanol + NaCl 175 mg/m(2) or CREL + ethanol + NaCl) and sacrificed immediately or 24 h after these drug infusions to systemic biochemical evaluations. Hidrosoluble vitamin E (vitE, Trolox) was added as a control in some groups. The oxidative profile was determined by measuring erythrocyte and plasma lipid peroxidation, superoxide dismutase and catalase activities, reduced glutathione (GSH) levels, red blood cell (RBC) counts, hemoglobin profile, plasma total radical-trapping antioxidant parameter (TRAP), plasma lipid peroxidation, nitric oxide levels and malondialdehyde levels. Our findings showed that CREL infusion triggered immediate high plasma lipid peroxidation and augmented TRAP, while PTX caused immediate TRAP consumption and metahemoglobin formation. Pronounced oxidative effects were detected 24 h after infusion, when CREL treatment enhanced RBC counts and plasma lipid peroxidation, increased catalase activity, and decreased TRAP levels. On the other hand, after 24 h, PTX-infused rats showed reduced catalase activity and reduced metahemoglobin levels. These data indicate the existence of a continuous oxidative stress generation during CREL-PTX treatment and highlight CREL as primarily responsible for the in vivo oxidative damage to RBCs.
- Early downregulation of acute phase proteins after doxorubicin exposition in patients with breast cancer(2016) PANIS, Carolina; PIZZATTI, Luciana; BUFALO, Aedra Carla; HERRERA, Ana Cristina; VICTORINO, Vanessa Jacob; CECCHINI, Rubens; ABDELHAY, ElianaChemotherapy remains the first-choice option for adjuvant therapy in breast cancer. Here, we investigated the impact of the first chemotherapic cycle of doxorubicin on the plasmatic-proteomic profiling of women diagnosed with breast cancer (n = 87). Blood samples were obtained from the same patient before and after doxorubicin infusion (1 h, 60 mg/m(2)) and processed for label-free LC-MS proteomic screening. A total of 80 proteins were downregulated after chemotherapy. In silico analysis revealed that the main biological process enrolled was inflammation and canonical pathways involving acute phase proteins. TNF-alpha, IL-1 beta, IL-12, TGF-beta 1, clusterin, and gelsolin were chosen as relevant for further validation. All selected targets presented reduced plasmatic levels after treatment. Our results indicate that doxorubicin downregulated acute phase proteins immediately after its infusion. Since such proteins are cancer promoting, its downregulation could support the effectiveness of doxorubicin along treatment.