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1.
Med. oral patol. oral cir. bucal (Internet) ; 22(1): e58-e63, ene. 2017. ilus, tab
Artigo em Inglês | IBECS | ID: ibc-159767

RESUMO

BACKGROUND: Due to increased formaldehyde exposure, carcinogenic to humans, several researches have been studying the potential toxicity and the safe levels for human beings. The aim of this study was to investigate mutagenicity and cytotoxicity in buccal epithelial exfoliated cells (BEC) of students subjected to formaldehyde (FA) during anatomy classes. MATERIAL AND METHODS: BEC were collected periodically from 17 volunteers of undergraduate programs, who had participated in practical anatomy classes, before and after FA exposure. Cells were stained according to Feulgen method and then micronucleus test was applied. A total of 1,500 cells were assessed per individual in this study for the micronucleus frequency and other parameters of cytotoxicity. RESULTS: There was statistically significant increase in number of micronucleated BEC after FA exposure (after 1 month p=.034 and after 3.5 months p=.017). However, FA exposure caused no significant increase in other nuclear alterations closely related to cytotoxicity (p≥.05). CONCLUSIONS: FA induced mutagenicity during anatomy classes. Cell death increased, but it was not statistically significant. Efforts have to be made to improve air quality and reduce exposures during anatomy classes


Assuntos
Humanos , Formaldeído/farmacocinética , Citotoxicidade Imunológica , Células Epiteliais , Testes de Mutagenicidade/métodos , Anatomia/educação , Carcinógenos/farmacocinética , Testes para Micronúcleos/métodos
2.
Med. segur. trab ; 62(242): 4-14, ene.-mar. 2016. ilus, tab, graf
Artigo em Inglês | IBECS | ID: ibc-153232

RESUMO

INTRODUCTION: Formaldehyde is a compound with a wide range and is commonly used in anatomy and pathology laboratories. At room temperature is quickly volatilized to a pungent and suffocating gas and its inhalation has been correlated to nuclear alterations in different tissues. We aimed to investigate whether exposure to this compound was correlated with the appearance of cytotoxic and genotoxic features in the nasal epithelial cells of students enrolled in a human anatomy course. MATERIAL AND METHODS: This prospective study collected periodically nasal cells from mucosa of 17 volunteers from two different undergraduate programs with different workloads of practical lessons in an anatomy laboratory, 30 and 90 hours per semester. Cells were staining according to Feulgen method and nuclear morphology was analyzed to detect possible damage. Dunn's post hoc test was used in the statistical analysis. Pearson's correlation was performed for gender, age and questionnaire responses. RESULTS: Epithelial cells showed indicators of cytotoxicity and mutagenicity. Students with a more extensive workload in anatomy laboratory displayed a more severe profile with an increase in karyorrhexis (p 0.05). CONCLUSION: Individuals exposed for short periods of time to formaldehyde are subject to the toxic action of this gas. Karyorrhexis was the most frequently observed cytotoxic feature and micronucleus showed an increase between the first time point. The patterns observed between the student's groups suggest a negative effect due to exposure time


INTRODUCCIÓN: El formaldehído es un compuesto con una amplia variedad y se utiliza comúnmente en los laboratorios de anatomía y patología. En la temperatura ambiente se volatiliza rápidamente en un gas acre sofocante. Su inhalación se ha correlacionado con la aparición de alteraciones nucleares en diferentes tejidos. El objetivo fue investigar si la exposición a este compuesto podría estar relacionado con la aparición de aspectos citotóxicos y genotóxicos en las células epiteliales nasales de los estudiantes del curso de anatomía humana. MATERIAL Y MÉTODOS: En este estudio las células nasales proclives se recogieron periódicamente de la mucosa de los 17 voluntarios de las carreras universitarias con diferentes cargas de clases prácticas en el laboratorio de anatomía, 30 y 90 horas semestrales. Las células fueron teñidas por el método de Feulgen y la morfología nuclear fue evaluada para la detección de posibles daños. Prueba post hoc de Dunn fue utilizada para el análisis estadístico. Correlación de Pearson fue realizada con los datos de sexo, edad y las respuestas del cuestionario. RESULTADOS: Las células epiteliales mostraron indicadores de citotoxicidad, mutagenicidad. Los estudiantes con una carga de trabajo más extensa en el laboratorio de anatomía mostraron perfil más grave con el aumento de cariorrexis (p 0,05). CONCLUSIÓN: Individuos expuestos durante cortos períodos de tiempo a formaldehído están sujetos a la acción tóxica de gas. Cariorrexis fue la característica citotóxica observada con mayor frecuencia y micronúcleos mostraron un aumento entre el primer punto de tiempo. Los diferentes patrones de daños observados entre los grupos de estudiantes sugieren que el efecto negativo de gas puede está relacionado con el tiempo de exposición


Assuntos
Humanos , Formaldeído/efeitos adversos , Exposição Ambiental/efeitos adversos , Anatomia/educação , Estudantes de Medicina/estatística & dados numéricos , Carcinógenos/isolamento & purificação , Mucosa Nasal , Testes de Mutagenicidade/métodos
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