Published August 28, 2023 | Version v1
Journal article Open

Efeito da melatonina na histofisiologia do fígado de ratos adolescentes expostos ao álcool

Description

O presente estudo avaliou se a administração de melatonina durante a adolescência pode prevenir os efeitos prejudiciais produzidos pelo álcool no fígado. Trinta ratos albinos (Rattus norvegicus albinus), fêmeas, com 40 dias de idade, virgens, pesando aproximadamente 150±10g, da linhagem Wistar, foram divididas nos seguintes grupos: I – Ratos adolescentes que não receberam álcool e foram sacrificadas aos 60 dias de vida; II – Ratos adolescentes submetidas ao consumo crônico de álcool e sacrificadas aos 60 dias de vida; III – Ratos adolescentes submetidas ao consumo crônico de álcool e simultaneamente tratadas com melatonina, e sacrificadas aos 60 dias de vida. Os órgãos coletados passaram por processamento histológico e, para obter os resultados, foram realizadas análises morfométricas, histopatológicas e histoquímicas. O álcool foi administrado por gavagem, por injeção intragástrica, na dose de 3 g/Kg de álcool etílico nos ratos dos grupos II e III, por 20 dias. A melatonina foi administrada em injeções diárias de 0,8 mg/Kg, sempre no início da noite, intraperitonealmente, por 20 dias. Ao analisar o peso dos animais, não foi observada diferença significativa entre os grupos. Os animais do grupo II apresentaram alterações nos fígados, como congestão da veia centrolobular, balonamento hepatocelular, esteatose microgoticular, infiltrado leucocitário, vários núcleos picnóticos nos fígados, aumento no parênquima lobular e redução no parênquima não lobular, maior deposição de colágeno e redução de glicogênio. O tratamento com melatonina preveniu todas essas mudanças. Com isso, podemos concluir que a melatonina possui grande potencial terapêutico na prevenção de danos hepáticos em ratos adolescentes submetidas ao consumo moderado de álcool, além de efeitos positivos na deposição de colágeno e glicogênio no fígado.

Abstract (English)

The present study evaluated whether melatonin administered during adolescence can prevent the deleterious effects produced by alcohol on the liver. Thirty albino female rats (Rattus norvegicus albinus), 40 days old, virgins, weighing approximately 150±10g, from the Wistar lineage and were divided into the following groups: I – Adolescent rats that did not receive alcohol and euthanized at 60 days of life; II – Adolescent rats subjected to chronic alcohol consumption and euthanized at 60 days of life; III – Adolescent rats subjected to chronic alcohol consumption and simultaneously treated with melatonin, and euthanized at 60 days of life. The collected organs underwent histological processing and to obtain the results, morphometric, histopathological and histochemical analyzes were performed. Alcohol was administered by gavage. intragastric injection at a dosage of 3 g/Kg of ethyl alcohol in the rats of groups II and III for 20 days. Melatonin was administered in daily injections of 0.8 mg/Kg, always at the beginning of the night, intraperitoneally for 20 days. When analyzing the weight of the animals, no significant difference was observed between the groups. The animals in group II presented alterations in the livers such as congestion of the centrilobular vein, hepatocellular ballooning, microgoticular steatosis, leukocyte infiltrate, several pyknotic nuclei in the livers, increase in lobular parenchyma and reduction in non-lobular parenchyma, greater deposition of collagen and reduction of glycogen. Melatonin treatment prevented all these changes. With this, we can conclude that melatonin has great therapeutic potential in the prevention of liver damage in adolescent rats subjected to moderate alcohol consumption, in addition to positive effects on the deposition of collagen and glycogen in the liver.

Abstract (Spanish)

El presente estudio evaluó si la melatonina administrada durante la adolescencia puede prevenir los efectos perjudiciales producidos por el alcohol en el hígado. Se utilizaron treinta ratas albinas hembra (Rattus norvegicus albinus), de 40 días de edad, vírgenes, con un peso aproximado de 150±10g, de la línea Wistar, y se dividieron en los siguientes grupos: I – Ratas adolescentes que no recibieron alcohol y fueron sacrificadas a los 60 días de vida; II – Ratas adolescentes sometidas a consumo crónico de alcohol y sacrificadas a los 60 días de vida; III – Ratas adolescentes sometidas a consumo crónico de alcohol y tratadas simultáneamente con melatonina, y sacrificadas a los 60 días de vida. Los órganos recolectados fueron sometidos a procesamiento histológico y para obtener los resultados se realizaron análisis morfométricos, histopatológicos e histoquímicos. El alcohol se administró por gavage (sonda gástrica) en una dosis de 3 g/Kg de alcohol etílico en las ratas de los grupos II y III durante 20 días. La melatonina se administró en inyecciones diarias de 0,8 mg/Kg, siempre al inicio de la noche, por vía intraperitoneal durante 20 días. Al analizar el peso de los animales, no se observaron diferencias significativas entre los grupos. Los animales del grupo II presentaron alteraciones en los hígados, como congestión de la vena centrolobulillar, hepatocelular, microgoticular, infiltrado leucocitario, varios núcleos picnóticos en los hígados, aumento del parénquima lobulillar y reducción del parénquima no lobulillar, mayor deposición de colágeno y reducción de glucógeno. El tratamiento con melatonina previno todos estos cambios. Con esto, podemos concluir que la melatonina tiene un gran potencial terapéutico en la prevención del daño hepático en ratas adolescentes expuestas a un consumo moderado de alcohol, además de efectos positivos en la deposición de colágeno y glucógeno en el hígado.

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Additional details

Additional titles

Translated title (English)
Effect of melatonin on the liver histophysiology of adolescent rats exposed to alcohol
Translated title (Spanish)
Efecto de la melatonina en la histofisiología del hígado de ratas adolescentes expuestas al alcohol

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