Vasopressin increased adenyl cyclase activity in homogenates of both inner and outer renal medulla of the rat. It also increased the concentration of cyclic 3′,5′-adenosine monophosphate (AMP) in slices of both inner and outer medulla but not in renal cortex. In the inner medulla, a concentration of prostaglandin E1 (PGE1), which was ineffective by itself significantly reduced the stimulation of adenyl cyclase activity and cyclic AMP concentration induced by vasopressin. These results are consistent with the hypothesis that PGE1 can compete with vasopressin for adenyl cyclase-binding sites. However, the findings in the outer medulla suggest the situation is more complex. Although 10-8 M PGE1 had no effect by itself and inhibited the vasopressin-induced elevation of cyclic AMP, larger amounts of PGE1 increased both adenyl cyclase activity and cyclic AMP levels. The maximum effect on the latter parameter was at least 6 times as great as that of maximum amounts of vasopressin.
Nama P. Beck, Toshio Kaneko, Uriel Zor, James B. Field, Bernard B. Davis
Usage data is cumulative from June 2024 through June 2025.
Usage | JCI | PMC |
---|---|---|
Text version | 115 | 1 |
54 | 12 | |
Scanned page | 226 | 0 |
Citation downloads | 86 | 0 |
Totals | 481 | 13 |
Total Views | 494 |
Usage information is collected from two different sources: this site (JCI) and Pubmed Central (PMC). JCI information (compiled daily) shows human readership based on methods we employ to screen out robotic usage. PMC information (aggregated monthly) is also similarly screened of robotic usage.
Various methods are used to distinguish robotic usage. For example, Google automatically scans articles to add to its search index and identifies itself as robotic; other services might not clearly identify themselves as robotic, or they are new or unknown as robotic. Because this activity can be misinterpreted as human readership, data may be re-processed periodically to reflect an improved understanding of robotic activity. Because of these factors, readers should consider usage information illustrative but subject to change.