Effects of salmeterol on secretion of phosphatidylcholine by alveolar type II cells

Vasanth H.S. Kumar, Constance Christian, Mitchell J. Kresch

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


β-adrenergic agents enhance secretion of phosphatidylcholine (PC) by adult and fetal type II cells. We have previously shown that terbutaline stimulates secretion of PC by fetal type II cells, but the response wanes after 30 minutes. We studied the effects of salmeterol, a highly selective, long-acting β-adrenergic agonist that does not cause receptor desensitization, on PC secretion by adult type II alveolar cells in primary culture. Release of lactate-dehydrogenase was < 4% and did not vary with the concentration of salmeterol. Salmeterol stimulated PC secretion in a concentration-dependent manner. The maximum effective-concentration tested was 50 nM and the EC50 was 11.40 ± 1.14 nM. Propranolol inhibited the effect of salmeterol on release of PC, confirming that the effects of salmeterol are mediated by β-receptors. OT50, the time for onset of action, was 32.0 ± 1.6 minutes. RT50, the time to achieve 50% recovery from maximal stimulation was, 393.0 ± 20.2 minutes. We conclude that salmeterol stimulates PC secretion by type II cells through activation of β- adrenergic receptors and has a longer duration of action (>6 hours) compared to other β2-agonists. Salmeterol may be a useful drug with which to study the role of receptor desensitization in the developmental changes in PC secretion.

Original languageEnglish (US)
Pages (from-to)1639-1646
Number of pages8
JournalLife Sciences
Issue number17
StatePublished - Mar 17 2000

All Science Journal Classification (ASJC) codes

  • General Pharmacology, Toxicology and Pharmaceutics
  • General Biochemistry, Genetics and Molecular Biology


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