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Differences of alcohol drinking behavior, brain dopamine (DA) and serotonin (5-HT) levels and releases in the striatum were investigated in stroke-prone spontaneously hypertensive rats (SHRSP) and age-matched stroke-resistant spontaneously hypertensive rats (SHRSR). Voluntary alcohol (EtOH) consumption in SHRSP rats increased at 1 and 2 hours in the 4 hour time access. In the DA level, SHRSP showed decreases in the caudate-putamen (C/P) and dorsal raphe nucleus (DRN) compared with in SHRSR. 5-HT levels in the C/P, ventral tegmental area-subtantia nigra (V/S) and DRN of the SHRSP were decreased compared with that in SHRSR. The basal extracellular levels of 5-HT release in the C/P were increased in SHRSP as compared with those in SHRSR. K(+)- or EtOH-induced DA and 5-HT releases in the C/P of the SHRSP were a lower magnitude than those in SHRSR. Increased basal extracellular 5-HT releases showing low levels of 5-HT in the C/P of SHRSP mean an abnormality of serotonergic neuronal functions in a normal physiological condition. Higher voluntary alcohol drinking behavior, so called lower susceptibility to EtOH, in the SHRSP may be associated with the degenerated rewarding system including the DRN. These results suggest that the hypertensive state causes the dysfunction in the striatum of the brain rewarding system and induces the risk for increasing alcohol consumption to compensate for the alteration of serotonergic neurons.

tohoku journal of experimental medicine

Pharmacological Studies of Alcohol Susceptibility and Brain Monoamine Function in Stroke-Prone Spontaneously Hypertensive Rats (SHRSP) and Stroke-Resistant Spontaneously Hypertensive Rats (SHRSR)