{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,7,30]],"date-time":"2024-07-30T13:57:50Z","timestamp":1722347870260},"reference-count":43,"publisher":"American Physiological Society","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American Journal of Physiology-Gastrointestinal and Liver Physiology"],"published-print":{"date-parts":[[2001,4,1]]},"abstract":"<jats:p>Chronic \u03b2<jats:sub>1<\/jats:sub>-adrenergic receptor activation results in hypertrophy and hyperplasia of rodent salivary gland acinar cells. Na<jats:sup>+<\/jats:sup>\/H<jats:sup>+<\/jats:sup>exchanger isoform 1 (NHE1) regulates cell volume and the induction of cell proliferation in many tissues. To investigate the relationship between NHE1 and the response of parotid glands to \u03b2<jats:sub>1<\/jats:sub>-adrenergic agonists, we examined by Northern blot analysis NHE1 expression in saline-treated mice and mice 30 min and 2, 6, and 24 h after isoproterenol injection. NHE1 transcripts increased \u223c50% by 2 h, and a more than twofold increase was noted at 24 h. Isoproterenol did not acutely increase Na<jats:sup>+<\/jats:sup>\/H<jats:sup>+<\/jats:sup>exchanger activity; however, exchanger activity was significantly elevated by 24 h. To test whether NHE1 activity is essential for inducing salivary gland hypertrophy in vivo, mice with targeted disruption of Nhe1 were treated with isoproterenol. Na<jats:sup>+<\/jats:sup>\/H<jats:sup>+<\/jats:sup>exchanger activity was absent in acinar cells from Nhe1<jats:sup>\u2212\/\u2212<\/jats:sup>mice, nevertheless, the lack of NHE1 failed to inhibit isoproterenol-induced hypertrophy. These data directly demonstrate that acinar cell hypertrophy induced by chronic \u03b2<jats:sub>1<\/jats:sub>-adrenergic receptor stimulation occurs independently of NHE1 activity.<\/jats:p>","DOI":"10.1152\/ajpgi.2001.280.4.g694","type":"journal-article","created":{"date-parts":[[2017,12,24]],"date-time":"2017-12-24T15:41:03Z","timestamp":1514130063000},"page":"G694-G700","source":"Crossref","is-referenced-by-count":0,"title":["Targeted disruption of the<i>Nhe1<\/i>gene fails to inhibit \u03b2<sub>1<\/sub>-adrenergic receptor-induced parotid gland hypertrophy"],"prefix":"10.1152","volume":"280","author":[{"given":"James E.","family":"Melvin","sequence":"first","affiliation":[{"name":"Center for Oral Biology, Aab Institute of Biomedical Sciences,"},{"name":"Eastman Department of Dentistry, University of Rochester Medical Center, Rochester, New York 14642; 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