Resumen

JOHNSON P, M Cecilia et al. P₄₅₀Arom and estrogenic microenvironment of eutopic endometria in endometriosis. Rev. méd. Chile [online]. 2004, vol.132, n.12, pp.1475-1482. ISSN 0034-9887.  http://dx.doi.org/10.4067/S0034-98872004001200004.

Background: Endometriosis, a common gynecologic disorder characterized by endometrial glands and stroma outside the uterus, is diagnosed by direct visualization of peritoneal and ovarian implants during laparoscopy. Aim: To study the estrogenic microenvironment in eutopic endometria of women with and without endometriosis. Patients and methods: Eutopic endometria, obtained during laparoscopy from 23 women with endometriosis and 20 fertile cyclic women undergoing tubal sterilization, was studied. P₄₅₀Arom mRNA expression (RT-PCR) was measured. Also, P₄₅₀Arom activity was assessed measuring testosterone conversion to estradiol and the concentration of this last hormone in cultured endometrial explants. Results: Age and body mass index was similar in both groups studied. Seventy nine percent of endometria from women with endometriosis and in 29.4% from control group expressed P₄₅₀Arom mRNA (p <0.01). The intensity of the band was higher in secretory endometria from women with endometriosis when compared to controls (p <0.01), but it was similar during the proliferative phase. Estradiol secretion to the culture media by proliferative endometria explants from women with endometriosis was 3-fold higher than secretory endometria (p <0.01) and endometria from control women in both phases. P₄₅₀Arom activity, in the presence of testosterone, was 7-fold higher in endometrial cultures from women with endometriosis, when compare with the basal culture (p <0.01). However, in endometrial explant cultures from control women, this activity was not statistical different. Conclusions: These results indicate that in women with endometriosis, the microenvironment in the endometria is estrogenic as a consequence of an increased expression and activity of the P₄₅₀ Arom (Rev Méd Chile 2004; 132: 1475-82).

Palabras clave : Aromatase; Cytochrome P₄₅₀; Endometriosis; Genital neoplasms; female: P₄₅₀ AROM.

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