Abstract：
:The effect of regucalcin, a Ca(2+)-binding protein, on Ca(2+)-dependent protein kinase activity in the brain cytosol of rats with different ages (5 and 50 weeks old) was investigated. The addition of calmodulin (10 microg/ml) or dioctanoylglycerol (5 microg/ml) in the enzyme reaction mixture caused a significant increase in protein kinase activity in the presence of CaCl2 (1 mM), indicating that Ca2+ calmodulin or protein kinase C is present in the cytosol. Such an increase was completely prevented by the addition of regucalcin (10(-7) M). Moreover, regucalcin (10(-7) M) significantly inhibited cytosolic protein kinase activity without Ca2+/calmodulin or dioctanoylglycerol addition. Meanwhile, the presence of anti-regucalcin monoclonal antibody (10-50 ng/ml) in the enzyme reaction mixture caused a significant elevation of protein kinase activity, suggesting an inhibitory effect of endogenous regucalcin. Brain cytosolic protein kinase activity was significantly elevated by increasing age (50-week-old rats). Also, regucalcin (10(-7) M) significantly decreased protein kinase activity without Ca(2+) addition in the brain cytosol of aged rats. However, the effect of anti-regucalcin monoclonal antibody (50 ng/ml) in elevating protein kinase activity was not seen in the brain cytosol of aged rats. These results suggest that regucalcin has an inhibitory effect on Ca(2+)-dependent protein kinase activity in rat brain cytosol, and that the effect of endogenous regucalcin may be weakened in the brain cytosol of aged rats.
journal_name
Brain Res Bulljournal_title
Brain research bulletinauthors
Hamano T,Hanahisa Y,Yamaguchi Mdoi
10.1016/s0361-9230(99)00184-7keywords:
subject
Has Abstractpub_date
1999-10-01 00:00:00pages
187-92issue
3eissn
0361-9230issn
1873-2747pii
S0361-9230(99)00184-7journal_volume
50pub_type
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