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Original Studies |
Promotes Proliferation of Endometriotic Stromal Cells by Inducing Interleukin-8 Gene and Protein Expression
Department of Obstetrics and Gynecology, Tottori University School of Medicine, Yonago 683-8504, Japan
Address all correspondence and requests for reprints to: Tomio Iwabe, M.D, Department of Obstetrics and Gynecology, Tottori University School of Medicine, Yonago 683-8504, Japan.
Endometriosis, a common disease among women of reproductive age, is
characterized by the presence of endometrial-like tissue outside the
uterus. We and others showed that several cytokine levels, including
interleukin-8 (IL-8) and tumor necrosis factor-
(TNF
), are
elevated in the peritoneal fluid of women with endometriosis compared
with those in women without endometriosis. We also demonstrated that
the addition of IL-8 to the culture medium stimulated the proliferation
of cultured endometriotic stromal cells. TNF
is a multipotent
cytokine that induces IL-8 production in various cell types. Therefore,
we hypothesized that TNF
may also contribute to the pathogenesis of
endometriosis by inducing the production of IL-8. To test this
hypothesis, we analyzed the peritoneal fluid concentrations of IL-8 and
TNF
using enzyme-linked immunosorbent assay (ELISA). We observed a
significant correlation between the levels of TNF
and IL-8 in the
peritoneal fluid of endometriosis patients. We also obtained the
endometriotic stromal cells from chocolate cyst linings of the ovary.
The expression of the receptors for TNF
(TNFR) was examined by
RT-PCR. We observed the expression of both TNFR-I and TNFR-II genes in
endometriotic stromal cells. The expression of IL-8 gene and protein
was analyzed by Northern blot hybridization and enzyme-linked
immunosorbent assay, respectively. TNF
induced the gene and protein
expression of IL-8 in endometriotic stromal cells in a dose-dependent
fashion. The addition of TNF
promoted the proliferation of the
endometriotic stromal cells, and the stimulatory effects of TNF
were
abolished by adding anti-IL-8 antibody. We demonstrated for the first
time that TNF
stimulated proliferation of endometriotic stromal
cells through induction of IL-8 gene and protein expression. We
concluded that the TNF
may be one of the essential factors for the
pathogenesis of endometriosis.
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