Effects of methylphenidate on the aggressive behavior, serotonin and dopamine levels, and dopamine-related gene transcription in brain of male Nile tilapia (Oreochromis niloticus)

Autor(es)

Batalhao, Isabela Gertrudes ^[1] ; Lima, Daina ^[2] ; Montedor Russi, Ana Paula ^[3] ; Pereira Boscolo, Camila Nomura ^[4] ; Humberto Silva, Danilo Grunig ^[1] ; Boscolo Pereira, Thiago Scremin ^{[4, 5]} ; Dias Bainy, Afonso Celso ^[2] ; de Almeida, Eduardo Alves ^[6]

Afiliação do(s) autor(es)

^[1] UNESP Sao Paulo State Univ, Dept Chem & Environm Sci, Sao Paulo - Brazil

^[2] UFSC Fed Univ Santa Catarina, Dept Biochem, Florianopolis, SP - Brazil

^[3] UNESP Sao Paulo State Univ, Dept Physiol, Sao Paulo, SP - Brazil

^[4] UNIRP Univ Ctr Rio Preto, Sao Jose Do Rio Preto, SP - Brazil

^[5] FACERES Med Sch, FACERES Morphofunct Lab, Sao Jose Do Rio Preto, SP - Brazil

^[6] FURB Fundacao Univ Reg Blumenau, Dept Nat Sci, Blumenau, SC - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FISH PHYSIOLOGY AND BIOCHEMISTRY; v. 45, n. 4, p. 1377-1391, AUG 2019.
• Citações Web of Science: 0

Resumo

The occurrence of pharmaceuticals in the aquatic environment has increased considerably in the last decades, causing negative biochemical, physiological, and behavioral effects in aquatic organisms. In this study, we evaluated the effects of methylphenidate (MPH) on the aggressive behavior, dopamine-related gene transcript levels, monoamine levels, and carboxylesterase transcript levels and activity in the brain of male Nile tilapia (Oreochromis niloticus). Carboxylesterase activity was also measured in the liver and gills. Fish were exposed for 5days to MPH at 20 and 100ngL(-1). Fish exposed to 100 ngL(-1) of MPH showed increased aggressiveness and decreased dopamine (DA) and serotonin (5-HT) levels. No changes were observed in plasma testosterone levels and in the transcript levels of D1 and D2 dopamine receptors, dopamine transporter (DAT), and carboxylesterase 2 (CES2). Exposure to 100 ngL(-1) of MPH caused a decrease in the transcript levels of carboxylesterase 3 (CES3) and an increase in tyrosine hydroxylase (TH), while exposure to 20 ngL(-1) of MPH increased the transcript levels of D5 dopamine receptor. Carboxylesterase activity was unchanged in the brain and liver and increased in the gills of fish exposed to 20 ngL(-1). These results indicate that MPH at 100 ngL(-1) increases aggressiveness in Nile tilapia, possibly due to a decrease in 5-HT levels in the brain and alterations in dopamine levels and dopamine-related genes. (AU)

• Processo FAPESP: 13/07937-8 - Redoxoma
• Beneficiário: Ohara Augusto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs