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Original Studies |
Expression in Human Uterine Leiomyoma and Its Down-Regulation by Progesterone1
Department of Obstetrics and Gynecology, Kobe University School of Medicine, Kobe 650-0017, Japan
Address all correspondence and requests for reprints to: Takeshi Maruo, M.D., Department of Obstetrics and Gynecology, Kobe University School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan. E-mail: maruo{at}kobe-u.ac.jp
Although tumor necrosis factor-
(TNF
) has been shown mainly to
inhibit proliferation and induce apoptosis in a variety of cells, no
information is available regarding whether human leiomyoma cells
express TNF
. In the present study, we examined the expression of
TNF
in leiomyomas, in comparison with that in the adjacent normal
myometrium, using immunohistochemical staining and Western immunoblot
analysis with a polyclonal antibody to human TNF
. Furthermore, we
investigated the effect of sex steroid hormones on TNF
expression in
leiomyoma cells cultured under serum-free, phenol red-free conditions.
Immunohistochemical staining showed that TNF
expression in leiomyoma
cells was higher than that in the adjacent normal myometrial cells,
being more abundant in the proliferative phase than in the secretory,
progesterone (P4)-dominated, phase of the menstrual cycle. TNF
expression in leiomyoma cells in pregnant uterus was scarce. Western
immunoblot analyses of leiomyoma and normal myometrial tissue extracts
revealed that TNF
, with a molecular mass of 17.3 kDa, was abundantly
present in leiomyoma tissue extracts, relative to normal myometrial
tissue extracts, and that TNF
expression in leiomyoma cells was most
abundant in the proliferative phase of the menstrual cycle, less
abundant in the secretory phase, and least abundant in pregnant uterus;
whereas no such changes in TNF
expression were noted in the normal
myometrium. In monolayer cultures of uterine leiomyoma cells under
serum-free conditions, addition of P4 (3.18 x
10-7 mol/L) resulted in a decrease in TNF
expression in the cells, relative to that in control cultures, whereas
treatment with 17ß-estradiol (3.67 x
10-8 mol/L) did not affect the TNF
expression in the cells. The concentrations of sex steroids used were
within the physiological tissue concentrations noted in leiomyoma and
myometrium. The present results suggest that the abundant expression of
TNF
may be a molecular basis characteristic of leiomyomas in the
human uterus and that P4 may play a vital role in down-regulating the
expression of TNF
in human uterine leiomyoma.
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