Inhibition of salivary secretion by lipopolysaccharide: Possible role of prostaglandins

A. Lomniczi, C. Mohn, A. Faletti, A. Franchi, S. M. McCann, V. Rettori, J. C. Elverdin

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Inducible (calcium-independent) nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) are important in the regulation of the function of different organs during infection. A single dose of lipopolysaccharide (LPS; 5 mg/kg ip) within 6 h increased NOS activity (20%) and prostaglandin E (PGE) content (100%) in submandibular glands (SMG) and blocked stimulated salivary secretion in adult male rats. The administration of an iNOS synthesis inhibitor, aminoguanidine (AG), with LPS decreased NOS activity and PGE content. Furthermore, the administration of meloxicam (MLX), an inhibitor of COX-2, blocked the increase in PGE and the production of NO. The incubation of slices of SMG in the presence of 3-morpholinosydnonimine, a donor of NO, increased the release of PGE highly significantly. The incubation of SMG in the presence of a PGE1 analog (alprostadil) increased the production of NO. These results indicate that LPS activates NOS, leading to NO release, which activates COX, generating PGEs that act back to further activate NOS, causing further generation of PGEs by activation of COX. Because the alprostadil administration inhibited stimulated salivation, LPS-induced inhibition of salivation appears to be caused by increased PGE production. Diminished salivary secretion produces poor oral health; thus the use of COX-2 inhibitors to counteract the effects of inhibited salivation should be considered.

Original languageEnglish (US)
Pages (from-to)E405-E411
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Issue number2 44-2
StatePublished - 2001
Externally publishedYes


  • Cyclooxygenase
  • Endotoxemia
  • Methacholine
  • Nitric oxide synthase
  • Noradrenaline

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Physiology (medical)


Dive into the research topics of 'Inhibition of salivary secretion by lipopolysaccharide: Possible role of prostaglandins'. Together they form a unique fingerprint.

Cite this