A desnutrição proteica perinatal não altera a expressão de c-Fos em áreas de controle hedônico do comportamento alimentar em ratos neonatos machos

Autores

  • Elton Gabriel Fernandes de Brito
  • Emily Pereira de Souza
  • Thays Kallyne Marinho de Souza
  • Taisy Cinthia Ferro Cavalcante
  • Amanda Alves Marcelino da Silva

DOI:

https://doi.org/10.34188/bjaerv9n4-058

Palavras-chave:

comportamento alimentar, desnutrição, gestação, lactação, ratos, serotonina, controle hedônico

Resumo

A desnutrição proteica perinatal altera os mecanismos neurais que controlam o comportamento alimentar, modificando os padrões de consumo de alimentos. Estímulos de controle hedônico sobrepõem-se à regulação homeostática, aumentando a ingestão alimentar e a duração das refeições. A serotonina é um importante modulador da saciedade, e a fenfluramina, uma sonda farmacológica liberadora de serotonina, foi utilizada aqui para avaliar a responsividade funcional de circuitos-alvo serotonérgicos no controle hedônico da alimentação. Este estudo avaliou o efeito da desnutrição proteica perinatal sobre o número de células c-Fos-imunorreativas ativadas em áreas de controle hedônico do comportamento alimentar em ratos neonatos machos. A análise imuno-histoquímica foi utilizada para visualizar células nervosas imunorreativas à proteína Fos em áreas de controle hedônico após a administração aguda de fenfluramina (3 mg/kg, s.c.) em ratos neonatos machos de 18 dias de idade. Não foram encontradas diferenças estatisticamente significativas entre os grupos no Caudado-Putâmen (p = 0,2071) ou na Amígdala Central (p = 0,5918). No entanto, observou-se diferença significativa na Amígdala Basolateral (p = 0,0052), com o grupo desnutrido+salina apresentando expressão de c-Fos acentuadamente elevada em relação ao controle+salina, e a administração de fenfluramina reduziu essa ativação elevada nos animais desnutridos, aproximando-a dos níveis do controle. A desnutrição precoce não altera a ativação neuronal (c-Fos) na maioria das áreas hedônicas avaliadas em ratos neonatos machos, mas aumenta significativamente a ativação basal e altera a responsividade à fenfluramina na Amígdala Basolateral, região crítica para o controle do consumo de alimentos palatáveis e para a integração entre as vias hedônica e homeostática.

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Publicado

2026-10-13

Como Citar

Brito, E. G. F. de, Souza, E. P. de, Souza, T. K. M. de, Cavalcante, T. C. F., & Silva, A. A. M. da. (2026). A desnutrição proteica perinatal não altera a expressão de c-Fos em áreas de controle hedônico do comportamento alimentar em ratos neonatos machos. Brazilian Journal of Animal and Environmental Research, 9(4), e89760. https://doi.org/10.34188/bjaerv9n4-058

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