Navegando por Autor "Cassali, Geovanni Dantas"
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Item Lecithin-based nanocapsule loading sucupira (Pterodon emarginatus) oil effects in experimental mucositis.(2022) Di Miceli, Jeruza Ferraz Filgueiras; Andrade, Maria Emília Rabelo; Carvalho, Paula Lopes Armond; Santos, Elandia Aparecida; Oliveira, Anna Eliza Maciel de Faria Mota; Fernandes, Caio Pinho; Cruz, Rodrigo Alves Soares; Garrett, Rafael; Mosqueira, Vanessa Carla Furtado; Cassali, Geovanni Dantas; D’Haese, Cecile; Nysten, Bernard; Leite, Jacqueline Isaura Alvarez; Cardoso, Valbert Nascimento; Araújo, Raquel SilvaIntestinal mucositis (IM) is a frequent adverse effect in anticancer therapy without standard treatment. The oil obtained from sucupira (Pterodon emarginatus) has anti-inflammatory properties, and the soybean lecithin re- duces the intestinal toxicity of several xenobiotics. However, their water insolubility impairs the in vivo appli- cation. For this reason, we evaluated if the nanoencapsulation of sucupira oil (SO) in lecithin-based nanocapsules (SO-NC) could be a therapeutically effective system for the treatment of IM in murine cisplatin (CDDP)-induced intestinal mucositis model. SO was analyzed by LC-HRMS/MS and HPLC. SO-NC was prepared by nano- precipitation and characterized using DLS, HPLC, and AFM. Mice body weight and food consumption were assessed daily during experimental mucositis induced by CDDP. The animals were euthanized, and intestinal permeability, inflammatory mediators, and intestinal histology were performed. SO-NC demonstrated adequate characteristics for oral administration as size under 300 nm, IP < 0.3, high EE, and spherical shape. In vitro cytotoxicity performed against RAW 264.7 cell lines resulted in cell viability above 80 % confirming the non- cytotoxic profile of SO (IC50 268 μg/mL) and SO-NC (IC50 118.5 μg/mL) up to 117.2 μg/mL. The untreated mice showed intestinal toxicity after i.p. of CDDP, principally weight loss, increased intestinal permeability, and MPO and TNF-α levels. Surprisingly, the administration of SO to CDDP-mucositis animals did not circumvent the CDDP effects and increased intestinal permeability. However, SO-NC proved efficient in mitigating the experi- mental intestinal mucositis by improving intestinal epithelium architecture, reducing intestinal permeability, and improving the MPO levels. In conclusion, SO-NC can positively impact intestinal mucositis by promoting mucosal recovery. This is a promising strategy for developing a new treatment for intestinal mucositis.Item Morphological aspects and immunophenotypic profiles of mammary carcinomas in benign-mixed tumors of female dogs.(2012) Ribeiro, Gustavo Meirelles; Bertagnolli, Angélica Cavalheiro; Rocha, Rafael Malagoli; Cassali, Geovanni DantasCarcinoma in benign-mixed tumor (CBMT) is common in the female canine mammary gland and comprises malignant epithelial between benign mesenchymal elements. This study investigated the morphological aspects of 29 CBMT and their immunophenotypical profiles, by using an immunohistochemistry panel based on five molecular markers—estrogen receptor (ER), progesterone receptor (PR), human epidermal growth factor receptor 2 (HER2), cytokeratin 5 (CK5), and human epidermal growth factor receptor 1 (EGFR). From these, CBMT was classified into four subtypes: luminal A, luminal B, HER2-like, basallike, and normal. “In situ” and invasive carcinomatous components were analyzed and compared. Histological grade I carcinoma was observed in 16 cases (55.2%) of the tumors analyzed, grade II in 10 cases (34.5%), and grade III in three cases (10.3%). The invasive carcinomatous component has shown, more frequently, luminal A (12/29 cases, 41.4%), followed by basal-like phenotype (8/29 cases, 27.6%). There was high concordance between immunophenotypical profiles of the in situ and invasive carcinomatous components (kappa coefficient = 0.816,P < 0.001).We concluded that CBMT predominantly has features of low-grade neoplasms of malignancy. The various immunophenotypic profiles suggest the origin of these lesions in more than one cell type (luminal and myoepithelial).Item Toxicological study of a new doxorubicin-loaded pH-sensitive liposome : a preclinical approach.(2018) Silva, Juliana de Oliveira; Miranda, Sued Eustaquio Mendes; Leite, Elaine Amaral; Sabino, Adriano de Paula; Borges, Karina Braga Gomes; Cardoso, Valbert Nascimento; Cassali, Geovanni Dantas; Guimarães, Andrea Grabe; Oliveira, Mônica Cristina de; Barros, André Luís Branco deDoxorubicin (DOX) is widely used in cancer treatment, however, the use of this drug is often limited due to its cardiotoxic side effects. In order to avoid these adverse effects, the encapsulation of DOX into nanosystems has been used in the last decades. In this context, pH-sensitive liposomes have been shown promising for delivering cytotoxic agents into tumor cells, however, the lack of information about in vivo toxicity of this nanocarrier has impaired translational studies. Therefore, the aim of this work was to investigate the acute toxicity and cardiotoxicity of DOX-loading pH-sensitive liposomes (SpHL-DOX). To achieve this, female BALB/c mice, after intravenous administration, were monitored by means of clinical, laboratory, histopathological and electrocardiographic (ECG) analyses. Results indicate that SpHL was able to prevent renal toxicity and the hepatic injury was less extensive than free DOX. In addition, lower body weight loss was associated with less ECG QT interval prolongation to animals receiving SpHL-DOX (14.6 ± 5.2%) compared to animals receiving free DOX (35.7 ± 4.0%) or non-pH-sensitive liposomes (nSpHL-DOX) (47.0 ± 9.8%). These results corroborate with SpHL-DOX biodistribution studies published by our group. In conclusion, the SpHL-DOX showed less toxic effects on mice compared to free DOX or nSpHL-DOX indicating that SpHL-DOX is a promising strategy to reduce the serious cardiotoxic effects of DOX.