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Sutoo, D. et al.

Sutoo, Akiyama,

Effect of dopamine receptor anatagonists on the calcium-dependent central function that reduces blood pressure in spontaneously hypertensive rats.

The effects of intracerebroventricular (i.c.v.) administration of dopamine receptor antagonists on the calcium-dependent brain function that reduces blood pressure were investigated. The systolic blood pressure of spontaneously hypertensive rats (SHR; male, 13 weeks of age) was reduced following i.c.v. administration of calcium chloride (100 microg/rat), and this effect of calcium chloride was attenuated by i.c.v. injection of eticlopride (dopamine D2 receptor antagonist, 100 microg/rat), but not by i.c.v. injection of SCH 23390 (dopamine D1 receptor antagonist, 30 microg/rat). Taking into consideration these results with our previous reports, it is suggested that calcium enhances dopamine synthesis in the brain through a calmodulin-dependent system, and that the resultant increase in dopamine levels inhibits sympathetic activity via the dopamine D2 receptor in the brain and reduces the blood pressure in SHR.[1]

References

Effect of dopamine receptor anatagonists on the calcium-dependent central function that reduces blood pressure in spontaneously hypertensive rats. Sutoo, D., Akiyama, K. Neurosci. Lett. (1999) [Pubmed]

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