Navegando por Palavras-chave "Sensibilização Locomotora"

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    Indução e expressão da sensibilização locomotora à cocaína e estruturas neuroanatômicas envolvidas nesse fenômeno: um estudo comportamental e estereológico
    (Universidade Federal de São Paulo (UNIFESP), 2017-05-31) Santos, Renan dos [UNIFESP]; Longo, Beatriz Monteiro [UNIFESP]; http://lattes.cnpq.br/0245964878412260; http://lattes.cnpq.br/5723339206716637; Universidade Federal de São Paulo (UNIFESP)
    Drug addiction has been one of the major concerns of modern society. Given this, it has been the focus of study in several segments of the human, medical and biological sciences. Epidemiological data, particularly in Brazil, show that the consumption of some drugs has been growing steadily over the years, a fact that serves as motivation for biological research that seeks to characterize this phenomenon. Studies have shown that drugs with abuse potential modulate the functioning of various brain structures in the limbic system, both in humans and rodents. Thus, the present study aimed to characterize the behavioral effects of locomotor sensitization to cocaine. In addition, we aimed to characterize neuroanatomical structures involved in this phenomenon, through the stereological quantification of Fos protein, a three-dimensional technique recognized for its excellence in unbiased quantification. For this, in the behavioral experiment 1, female Swiss mice were distributed in three groups: Sal-Sal, Coc-Sal, Sal-Coc. All animals were habituated for three consecutive days in the open field apparatus. The next day, the conditioning process began. Thus, animals from the Sal-Sal group received a first i.p. injection of saline solution and then were exposed to the open field for 10 minutes and returned to the housing box. Two hours later, these animals received a second saline injection and were immediately returned to the housing box. The animals of the Coc-Sal and Sal-Coc groups were handled in the same way except that the Coc-Sal group received the first injection of 10 mg / kg of cocaine and the second of saline, while the Sal-Coc group received the first injection of saline and the second dose of cocaine at a dose of 10 mg / kg. Thus, in the Coc-Sal group, cocaine was matched to the environmental context, not to the Sal-Coc group. Pharmacological treatment (cocaine or saline) occurred intermittently for 15 days. After the last day of conditioning, the animals were euthanized for a subsequent immunohistochemical procedure. In the behavioral experiment 2, the protocol followed in the same way, however, after the conditioning period, the animals remained without being manipulated experimentally for 10 days, after this interval, all the animals were challenged with cocaine and soon after, euthanized to later perform the immunohistochemical procedure. The behavioral results indicated that only the animals that were treated with cocaine in a similar way to the environmental context showed a marked locomotor response, both in behavioral experiment 1 (characterizing the development of locomotor sensitization) and behavioral experiment 2 (characterizing the expression of locomotor sensitization). Regarding Fos protein expression, there was a greater expression of this marker of neural activity in the medial dorsal prefrontal cortex, nucleus accumbens shell, basolateral amygdala and ventral integumentary area of cocaine-conditioned animals in the developmental phase of locomotive sensitization. While in the expression phase of locomotor sensitization, there was greater expression of Fos in the prefrontal cortex medial dorsum, nucleus accumbens core and shell, basolateral amygdala and central amygdala. In the orbitofrontal cortex, the animals that received cocaine in a context-matched form at the development stage of the sensitization had a lower Fos expression. Therefore, this data indicates that the environmental context plays a prominent role in the development and expression of locomotor sensitization, and that structures that make up the limbic system, but not all, contribute to this phenomenon.