Region-specific elevation of D₁ receptor-mediated neurotransmission in the nucleus accumbens of SHR, a rat model of attention deficit/hyperactivity disorder

Neuropharmacology
Yukihiro OhnoSaki Shimizu

Abstract

Spontaneously hypertensive rats (SHR) are widely used as a rat model of attention deficit/hyperactivity disorder (AD/HD). Here, we conducted neurochemical and behavioral studies in SHR to clarify the topographical alterations in neurotransmissions linked to their behavioral abnormalities. In the open-field test, juvenile SHR showed a significant hyperactivity in ambulation and rearing as compared with Wistar Kyoto rats (WKY). Brain mapping analysis of Fos-immunoreactivity (IR) revealed that SHR showed a marked increase in Fos expression in the core part (AcC) of the nucleus accumbens (NAc). Small to moderate increases were also observed in the shell part of the NAc and some regions of the cerebral cortex (e.g., parietal association cortex). These changes in Fos expression were region-specific and the Fos-IR levels in other brain regions (e.g., hippocampus, amygdala, striatum, thalamus and hypothalamus) were unaltered. In addition, treatment of SHR with the selective D₁ antagonist SCH-23390 significantly reversed both behavioral hyperactivity and elevated Fos expression in the AcC and cerebral cortex. The present study suggests that D₁ receptor-mediated neurotransmission in the AcC is region-specifically elevated in SHR, which c...Continue Reading

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Citations

Oct 23, 2013·Neuroscience Research·Takahiro MukaiYukihiro Ohno
Apr 9, 2015·Frontiers in Neuroanatomy·Álvaro García-AvilésFrancisco Olucha-Bordonau
Dec 26, 2013·Progress in Neuro-psychopharmacology & Biological Psychiatry·Saki ShimizuYukihiro Ohno
Apr 20, 2016·Behavioural Brain Research·Alicia IzquierdoAlexandra Stolyarova
Aug 11, 2016·Behavioural Brain Research·Naofumi KunisawaYukihiro Ohno
Feb 25, 2017·Frontiers in Pharmacology·Higor A IhaYukihiro Ohno
Feb 8, 2019·Neurotoxicity Research·Higor Alves IhaYukihiro Ohno
Apr 8, 2017·Frontiers in Behavioral Neuroscience·Maria C SchippersTommy Pattij

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