in view of previous studies showing that microinjections of cyclic amp analogs , forskolin , isoproterenol and adenosine into the same nts sites elicit a similar depression of respiration , the results with neca in the present study further support the notion that cyclic amp may serve as a second messenger in nts respiratory control regions and these respiratory depressant effects may be mediated by a single adenosine receptor subtype .
C0001443
adenosine
C0050789
neca