PROBLEM: Intra-uterine infection results in the production of inflammatory cytokines, including interleukin-6 (IL-6). Increased oxytocin-receptor (OTR) concentrations are associated with the onset of preterm labor. We hypothesize that infection up-regulates OTR expression through IL-6-induced transcription factors. METHOD OF STUDY: Primary cultures of human myometrium were treated for various time periods or with different concentrations of IL-6 and OTR mRNA as well as OTR binding were measured by means of reverse transcription polymerase chain reaction and 125I-ornithine-vasotocin-binding assay. To study underlying mechanisms of OTR changes with IL-6 treated, cells were also incubated with genistein or H7 (tyrosine and serine phosphorylation inhibitors), respectively. RESULTS: OTR mRNA increased 2.5-fold after 4 hr of IL-6 treatment and OTR binding 1.4-fold after 8 hr of cytokine stimulation. The IL-6-induced increase in binding was blocked by genistein and H7. CONCLUSIONS: IL-6 up-regulates uterine OTR mRNA expression and binding capacity in cultured human myocytes most likely through tyrosine and serine phosphorylation pathways involving the nuclear factor STAT-3.
PROBLEM: Intra-uterine infection results in the production of inflammatory cytokines, including interleukin-6 (IL-6). Increased oxytocin-receptor (OTR) concentrations are associated with the onset of preterm labor. We hypothesize that infection up-regulates OTR expression through IL-6-induced transcription factors. METHOD OF STUDY: Primary cultures of human myometrium were treated for various time periods or with different concentrations of IL-6 and OTR mRNA as well as OTR binding were measured by means of reverse transcription polymerase chain reaction and 125I-ornithine-vasotocin-binding assay. To study underlying mechanisms of OTR changes with IL-6 treated, cells were also incubated with genistein or H7 (tyrosine and serine phosphorylation inhibitors), respectively. RESULTS:OTR mRNA increased 2.5-fold after 4 hr of IL-6 treatment and OTR binding 1.4-fold after 8 hr of cytokine stimulation. The IL-6-induced increase in binding was blocked by genistein and H7. CONCLUSIONS:IL-6 up-regulates uterine OTR mRNA expression and binding capacity in cultured human myocytes most likely through tyrosine and serine phosphorylation pathways involving the nuclear factor STAT-3.
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