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  • Title: [Activity of nuclear factor kappa B in rat pulmonary tissue after entrance of amniotic fluid into blood and inhibition with dexamethasone].
    Author: Tian S, Shang T, Zhou XW.
    Journal: Zhonghua Fu Chan Ke Za Zhi; 2005 Feb; 40(2):95-8. PubMed ID: 15840287.
    Abstract:
    OBJECTIVE: To investigate the relationship between nuclear factor kappa B (NF-kappaB) and pulmonary injury in amniotic fluid embolism model of rat. METHODS: Seventy female Wistar rats were divided into five groups randomly: control group (6), amniotic fluid group (16), amniotic fluid + dexamethasone group (14), meconium group (20) and meconium + dexamethasone group (14). Different amniotic fluid was injected into jugular vein (dexamethasone was injected at 0.1 mg/100 g after entrance of amniotic fluid into blood) and blood pressure was examined. Pulmonary tissue was taken at 60 minutes. NF-kappaB activity was measured by Western-blot and percentage of NF-kappaB p65 positive cells in pulmonary tissue was determined by immunohistochemistry (HE). RESULTS: Dropsy, bleeding and neutrophil (PMN), macrophage, leukomonocyte infiltration were seen in four experimental groups. But none was found in control group. NF-kappaB activity in meconium group was 438,698 +/- 13,092, higher than those in amniotic fluid group, 377,982+/- 7,445, and in control group, 267,691 +/- 12 382 (F = 11.3, P < 0.01). With dexamethasone treatment, NF-kappaB activity was decreased, which was 308,826 +/- 13,771 in amniotic group and 339,516 +/- 17,358 in meconium group, respectively (t = 20.4 and t = 13.84, P < 0.01). Percentage of NF-kappaB p65 positive cells was higher in meconium group, 49.1 +/- 7.0, than in amniotic fluid group, 33.3 +/- 2.7, and control group, 13.3 +/- 2.1 (F = 1.17, P < 0.01). With dexamethasone treatment, the percentage decreased significantly to 22.9 +/- 3.0 and 21.4 +/- 3.6, respectively (t = 6.75 and t = 10.1, P < 0.05). CONCLUSIONS: NF-kappaB activity and percentage of NF-kappaB p65 positive cells are increased significantly, which is associated with pulmonary injury after entrance of amniotic fluid into blood and dexamethasone could inhibit NF-kappaB translocation to the nucleus to degrade NF-kappaB activity and alleviate pulmonary injury. NF-kappaB may be relevant to the occurrence and development of multiple organ dysfunction syndrome.
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