Although it is known that ryanodine receptor type 3 is expressed in the striatum, the function of this receptor has not been elucidated. Therefore, we examined whether caffeine- and ryanodine-induced dopamine release in striatal slices is affected in mice lacking ryanodine receptor type 3. Pretreatment with thapsigargin, an inhibitor of the Ca2+ ATPase pump of the endoplasmic reticulum, abolished caffeine- or ryanodine-induced dopamine release in slices from normal mice. Dopamine concentration in the striatum and KCl-induced dopamine release were unaffected by a ryanodine receptor type 3 deficiency. Ryanodine-induced dopamine release was significantly attenuated in mice lacking ryanodine receptor type 3, whereas caffeine-induced dopamine release was partially attenuated. Caffeine produced a similar hypermotor activity in both wild and homozygous mice. The present results suggest the involvement of ryanodine receptor type 3 in dopamine release from the striatum.
|Number of pages||5|
|Journal||Biochemical and Biophysical Research Communications|
|Publication status||Published - 1999 Dec 20|
ASJC Scopus subject areas
- Molecular Biology