title: Endotoxin, interleukin-1 beta, interleukin-6, or tumor necrosis factor-alpha do not acutely stimulate isolated murine myometrial contractile activity.
abstract: OBJECTIVE
  Endotoxin, interleukin-1 beta, interleukin-6, and tumor necrosis factor-alpha have been implicated in the pathogenesis of preterm labor, but their acute effect on myometrial contractile activity is unknown. The objective of this study was to determine their effect on isolated pregnant murine myometrial contractile activity.
  
  
  METHODS
  Isometric contractions were measured in myometrium isolated from pregnancy day 18 Swiss-Webster mice. Frequency, duration, amplitude, and integrated area were compared before and after the addition of endotoxin (10(3) and 10(4) ng/ml) (n = 6), interleukin-1 beta (10 and 10 ng/ml) (n = 6), interleukin-6 (1 and 10 ng/ml) (n = 6), and tumor necrosis factor-alpha (1 and 10 ng/ml) (n = 6). Results were analyzed with the Wilcoxon rank-sum test.
  
  
  RESULTS
  The addition of endotoxin, interleukin-1 beta, interleukin-6, or tumor necrosis factor-alpha did not result in a change in the contractile activity of isolated pregnant murine myometrium compared with control.
  
  
  CONCLUSIONS
  Endotoxin, interleukin-1 beta, interleukin-6, and tumor necrosis factor-alpha do not acutely increase isolated murine myometrial contractile activity.
authors.affiliation: Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Texas Medical School at Houston.
authors.forename: B T
authors.initials: BT
authors.lastname: Oshiro
authors.forename: M
authors.initials: M
authors.lastname: Monga
authors.forename: N L
authors.initials: NL
authors.lastname: Eriksen
authors.forename: J M
authors.initials: JM
authors.lastname: Graham
authors.forename: N W
authors.initials: NW
authors.lastname: Weisbrodt
authors.forename: J D
authors.initials: JD
authors.lastname: Blanco
mesh_terms: D000818:Animals; D016207:Cytokines / Q000502:physiology*; D004731:Endotoxins / Q000494:pharmacology*; D005260:Female; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000502:physiology; D015850:Interleukin-6 / Q000502:physiology; D051379:Mice; D009215:Myometrium / Q000187:drug effects / Q000276:immunology; D011247:Pregnancy; D014409:Tumor Necrosis Factor-alpha / Q000502:physiology; D014590:Uterine Contraction / Q000187:drug effects* / Q000276:immunology
chemical_list: D016207:Cytokines; D004731:Endotoxins; D007375:Interleukin-1; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha