Abstract：
:Dipyridamole (DPR) and nitrobenzylthioinosine (NBI) inhibition of adenosine accumulation in synaptoneurosomes derived from rat cerebral cortex, rat cerebellum, guinea pig cerebral cortex and guinea pig cerebellum was investigated. The inhibition of adenosine accumulation by NBI was observed to be distinctly biphasic in both guinea pig and rat synaptoneurosomes. Such biphasic inhibition consisted of a nM potency component to inhibition, accounting for 20-30% of the maximum inhibition, and a ?M potency component, accounting for the remaining 70-80% maximum inhibition. Such an inhibitory profile contrasts sharply with that of DPR which appears monophasic, with a mean IC(50) of between 10(?7) M and 10(?6) M, in all rat and guinea pig synaptoneurosomes preparations studied. Further differences between the potency of NBI and DPR in inhibiting [(3)H]adenosine accumulation were also noted. DPR was more potent in inhibiting [(3)H]adenosine accumulation in guinea pig cerebellar synaptoneurosomes than in cerebral cortex synaptoneurosomes. In rat synaptoneurosomes, the reverse selectivity was observed. DPR was also 2-6 fold (depending on brain region of comparison) more potent in inhibiting adenosine accumulation in guinea pig synaptoneurosomes than in inhibiting such accumulation in rat synaptoneurosomes. In contrast, NBI was approximately equipotent in inhibiting adenosine accumulation in rat and guinea pig synaptoneurosomes. Additional binding studies using [(3)H]NBI are also reported. The data presented are entirely consistent with the hypotheses that (1) NBI and DPR bind to functionally relevant sites and (2) there are different populations of nucleoside transporters in mammalian brain.
journal_name
Neurochem Intjournal_title
Neurochemistry internationalauthors
Morgan PF,Marangos PJdoi
10.1016/0197-0186(87)90055-6subject
Has Abstractpub_date
1987-01-01 00:00:00pages
339-46issue
3eissn
0197-0186issn
1872-9754pii
0197-0186(87)90055-6journal_volume
11pub_type
杂志文章abstract：:In the present study we investigated the effects of a single injection of reserpine on dopamine receptor function in rat striatum. The measurement of adenylate cyclase activity indicated that cAMP formation induced by the selective D-1 agonist SKF 82526 was greatly increased 2 and 20 h after reserpine; in contrast, th...
journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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更新日期：1980-01-01 00:00:00
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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pub_type： 杂志文章,评审
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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journal_title：Neurochemistry international
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