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Original Studies |
Department of Obstetrics and Gynecology (D.H., K.D., R.R.G., D.W., L.K.) and Department of Pathology (K.S.), University of Tübingen, Germany; and Center for Reproductive Sciences (D.H., R.N.T.), Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, California 94143-0556
Address correspondence and requests for reprints to: Robert N. Taylor, M.D., Ph.D., Center for Reproductive Sciences, HSE 1689, Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, California 94143-0556.
Our laboratories have focused recently on the production and
localization of eotaxin, a C-C-chemokine of 8.4 kDa, whose major
biological activity is the chemoattraction of eosinophils. Given
evidence of autoimmune activity in the endometriosis syndrome, we
hypothesized that eosinophil chemoattractants might be expressed in
endometriosis. In histological sections, we observed eotaxin protein
localized mainly in epithelial cells, with only very faint
immunostaining in the surrounding stromal cells. Prominent eotaxin
accumulation was noted in the luminal epithelium of secretory
endometrium. Eotaxin distribution in endometriosis was similar to that
seen in eutopic endometrium but with higher levels of eotaxin staining
in the glandular epithelium. Peritoneal fluid concentrations of eotaxin
were significantly higher in women with moderate or severe
endometriosis than in women with minimal or mild endometriosis or no
disease. The treatment of isolated human endometriosis epithelial cells
with estradiol, medroxyprogesterone acetate, tumor necrosis
factor-
, and interferon-
stimulated measurable eotaxin secretion
into the conditioned media. The results indicate that eotaxin is
produced in epithelial cells of normal endometrium and endometriosis
tissues, varies across the menstrual cycle, and is elevated in women
with endometriosis. We postulate that eotaxin, interacting with other
known cytokines and immune cells, contributes to an inflammatory
reproductive tract environment, leading to endometrial or blastocyst
dysfunction.
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