Degranulation of uterine mast cell modifies contractility of isolated myometrium from pregnant women

Egle Bytautiene, Yuri P. Vedernikov, George R. Saade, Roberto Romero, Robert E. Garfield

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


This study was undertaken to test that uterine mast cell degranulation alters human myometrial contractility in vitro and to define what mediators are involved in this process. Longitudinal myometrial strips prepared from biopsy specimen obtained from the lower uterine segment of women at preterm and term gestation (with and without labor) were studied. Contractile responses to compound 48/80, a mast cell degranulator, were compared in the absence or presence of a mast cell stabilizer, H 1 and H 2 receptor antagonists, cyclooxygenase, and lipoxygenase inhibitors. Compound 48/80 increased myometrial contractility in all groups. The mast cell stabilizer cromolyn inhibited contractility, whereas the cyclooxygenase inhibitor ibuprofen, the H 1-receptor antagonist S(+)-chlorpheniramine maleate, but not the H 2 antagonist cimetidine, only slightly attenuated this effect. The lipoxygenase inhibitor linoleyl hydroxamic acid augmented the responses to compound 48/80 in the preterm but not in the term group. Uterine mast cell degranulation, or the effects of their mediators, can modulate uterine contractility during pregnancy.

Original languageEnglish (US)
Pages (from-to)1705-1710
Number of pages6
JournalAmerican journal of obstetrics and gynecology
Issue number5
StatePublished - Nov 2004


  • Antihistaminic
  • Cromolyn sodium
  • Human pregnancy
  • Mast cells
  • Uterine contractility

ASJC Scopus subject areas

  • General Medicine
  • Obstetrics and Gynecology


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