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1.
Environ Pollut ; 286: 117296, 2021 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-33971473

RESUMO

Bisphenol A (BPA) is an endocrine disrupting chemical able to promote hormone-responsive tumors. The major route of BPA contamination being oral, the aim of the present study was to investigate BPA effects on oral cells. Here, we evaluated the impact of sub-chronic in vivo exposure to BPA and its in vitro effects on neoplastic and non-neoplastic oral cells. We evaluated the oral mucosa of mice chronically exposed to BPA (200 mg/L). The response of keratinocytes (NOK-SI) and Head and Neck (HN) Squamous Cell Carcinoma (SCC), HN12 and HN13 cell lines to BPA was examined. In vivo, BPA accumulated in oral tissues and caused an increase in epithelial proliferative activity. BPA disrupted the function of keratinocytes by altering pro-survival and proliferative pathways and the secretion of cytokines and growth factors. In tumor cells, BPA induced proliferative, invasive, pro-angiogenic, and epigenetic paths. Our data highlight the harmful effects of BPA on oral mucosa and, tumorigenic and non-tumorigenic cells. Additionally, BPA may be a modifier of oral cancer cell behavior by prompting a functional shift to a more aggressive phenotype.


Assuntos
Disruptores Endócrinos , Neoplasias Bucais , Animais , Compostos Benzidrílicos/toxicidade , Disruptores Endócrinos/toxicidade , Camundongos , Mucosa Bucal , Neoplasias Bucais/induzido quimicamente , Fenóis/toxicidade
2.
Anal Bioanal Chem ; 412(28): 7799-7810, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-32862322

RESUMO

Bisphenol A and phthalates are endocrine disruptors widely used as chemical additives mainly in plastic products, including materials for dentistry procedures. Besides, many plasticizers have been associated with important diseases requiring performed methods for their quantification. In the present study, an alternative method for the determination of bisphenol A (BPA) and phthalate metabolites in saliva was developed and validated using hollow fiber liquid phase microextraction (HF-LPME) for sample preparation and gas chromatography coupled to ion trap mass spectrometry (GC/MS) for analysis. A mixture of octanol and ethyl octanoate (1:1 v/v) was used as an acceptor phase in hollow fiber to extract the analytes from saliva samples. A Doehlert design was performed to optimize the variable sample agitation and extraction time. The HF-LPME-GC/MS method developed for saliva analysis showed good selectivity, linearity (R2 > 0.900), and precision (CV = 0.86-18.68%). Limits of detection and quantification ranged from 0.03 to 0.53 µg L-1 and 0.09 to 1.78 µg L-1, respectively. A high concentration of BPA in the oral cavity and oropharyngeal space is a warning of the possible association with the main cancer of the mouth. The method developed and validated was applied to patients with oral squamous cell carcinoma (study group, n = 16) and patients who did not present any oral lesion (control group, n = 16). A principal component analysis was performed and showed a tendency for the association between oral squamous cell carcinoma (OSCC) and plasticizers. Graphical abstract.


Assuntos
Monitoramento Biológico/métodos , Materiais Dentários , Disruptores Endócrinos/análise , Cromatografia Gasosa-Espectrometria de Massas/métodos , Microextração em Fase Líquida/métodos , Plastificantes/análise , Saliva/química , Humanos , Limite de Detecção , Reprodutibilidade dos Testes
3.
J Oral Pathol Med ; 48(10): 935-942, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31355943

RESUMO

BACKGROUND: The aim of the present study was to report the clinicopathologic, radiographic and immunohistochemical features of five South American cases of intraosseous xanthomas of the mandible and to compare them to those detected in a literature review. METHODS: Clinical data were collected from the records of three Oral and Maxillofacial Pathology services in South America and compared with those compiled from a literature review based on a search of three electronic databases (PubMed, Web of Science and Scopus). All cases were evaluated by haematoxylin and eosin staining and immunohistochemistry for CD68 and S-100. RESULTS: The series comprised four females (80%) and one male (20%) with a mean age of 23.3 ± 10.9 years (range: 13-45 years). In four cases, there was involvement of the posterior region of the mandible (80%). The lesions presented radiographically as unilocular (60%) radiolucencies with punched-out margin (80%). All cases predominantly consisted of CD68-positive and S-100-negative xanthomatous cells. No recurrences were observed after curettage, with a median follow-up of 27 months. CONCLUSION: Intraosseous xanthoma of the jaws is a rare benign disorder. We report here five additional cases affecting the mandible, for a total of 36 cases of the jaws reported in the literature. Overall, this lesion has predilection for posterior sites of the mandible of asymptomatic young adults.


Assuntos
Neoplasias Ósseas/diagnóstico , Mandíbula/patologia , Xantomatose/diagnóstico , Adolescente , Adulto , Feminino , Humanos , Imuno-Histoquímica , Masculino , Pessoa de Meia-Idade , Adulto Jovem
4.
Head Neck Pathol ; 12(1): 75-81, 2018 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-28597210

RESUMO

Cellular neurothekeomas (CNs) are distinctive benign tumors of uncertain histogenesis, with predilection for the skin of the head and neck region. We describe the first case of multiple desmoplastic CNs (DCNs) affecting the oral cavity in a 9-year-old girl. Histopathologic evaluation showed a proliferation of spindle and epithelioid cells, forming nests and bundles, supported by exuberant fibrous stroma, as well as scattered multinucleated floret-like giant cells. The tumor cells were immunopositive for vimentin, CD63, CD56, whereas AE1/AE3, S100, CD34, α-SMA, GFAP, EMA, CD57 and NSE were negative. Ki-67 was <2%. Multiple DCNs should be considered in the differential diagnosis of oral nodular lesions.


Assuntos
Neoplasias Bucais/patologia , Neoplasias Primárias Múltiplas/patologia , Neurotecoma/patologia , Biomarcadores Tumorais/análise , Criança , Feminino , Humanos
5.
Head Neck Pathol ; 10(4): 533-537, 2016 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-27260217

RESUMO

A case of oral leishmaniasis without cutaneous involvement affecting the upper alveolar ridge mucosa/gingiva and the hard palate is reported in a 41-year-old Brazilian man. Microscopic examination disclosed scarce amastigotes and the definitive diagnosis was facilitated by immunohistochemical analysis. The clinical presentation of this lesion is unusual and underlies the importance of considering leishmaniasis in the differential diagnosis of oral lesions, especially in endemic areas. A literature review of the cases of mucosal leishmaniasis with exclusive primary lesions of the oral mucosa was also performed.


Assuntos
Leishmaniose/diagnóstico , Doenças da Boca/diagnóstico , Adulto , Humanos , Imuno-Histoquímica , Masculino , Mucosa Bucal/parasitologia , Palato Duro/parasitologia
6.
Drug Chem Toxicol ; 39(1): 53-8, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-25826182

RESUMO

This study evaluated the effect of in vitro exposure to cypermethrin on peripheral blood mononuclear cells proliferative response, considering reduced peripheral blood mononuclear cells proliferative response observed in individuals occupationally exposed to pyrethroids. Peripheral blood mononuclear cells were obtained from 21 healthy subjects (28.0 ± 9.0 years old). The effect of cypermethrin (at 0.5, 1.0 and 5.0 mg/ml) on cell viability was evaluated by flow cytometry using an apoptosis detection kit. Cell proliferation (PI) was evaluated by 5-(and 6)-carboxyfluorescein diacetate succinimidyl ester (CFSE) fluorescence decay using flow cytometry. Cells labeled with CFSE were exposed, in vitro, to cypermethrin (0.5, 1.0, 2.0, 2.5 and 4 µg/ml) and stimulated with phytohemagglutinin (PHA 1.0 or 5.0 µg/ml) for 5 d (37 °C, 5% CO2). The in vitro treatment of peripheral blood mononuclear cells with cypermethrin did not induce apoptosis or necrosis after 5 d in culture. Stimulation by PHA induced cell proliferation (PI = 1.29 ± 1.09 and 2.01 ± 0.62, PHA at 1.0 and 5.0 µg/ml, respectively, mean ± SD) and in vitro exposure to cypermethrin did not alter cellular proliferative response to PHA (PI = 1.80 ± 0.50, 2.60 ± 0.05 and 2.10 ± 1.20 for cypermethrin at 1.0, 2.0 and 4.0 µg/ml, respectively, and PHA at 5.0 µg/ml). In vitro treatment of peripheral blood mononuclear cells with cypermethrin, at the doses tested, does not affect cell viability or proliferation. These findings suggest that the reduction of proliferation observed on lymphocytes derived from individuals occupationally exposed to pesticides may be related to other mechanisms than direct action of cypermethrin on lymphocytes.


Assuntos
Apoptose/efeitos dos fármacos , Inseticidas/toxicidade , Leucócitos Mononucleares/efeitos dos fármacos , Piretrinas/toxicidade , Adulto , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Citometria de Fluxo , Humanos , Técnicas In Vitro , Inseticidas/administração & dosagem , Linfócitos/efeitos dos fármacos , Piretrinas/administração & dosagem , Adulto Jovem
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