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3.
Cancer Res ; 59(22): 5737-44, 1999 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-10582693

RESUMO

Uterine leiomyomata are the main indication for a hysterectomy in the United States and occur in 25% of women >35 years. Because uterine leiomyomata can form when ovariectomized guinea pigs are exposed to estradiol and retinoic acids, we tested whether human leiomyomata had high levels of retinoic acids and related nuclear receptors. Compared with normal human myometrium, leiomyomata had 3- to 5-fold higher levels of peroxisome proliferator-activated receptor gamma (PPARgamma), retinoid X receptor alpha proteins, and all-trans retinoic acid, but only during the follicular phase of the menstrual cycle. 9-cis Retinoic acid was undetectable in either leiomyomata or myometrium. PPARgamma mRNA levels were lower in leiomyomata than myometrium, but only during the luteal phase of the cycle. A PPARgamma agonist, troglitazone, was given to guinea pigs along with estradiol and all-trans retinoic acid and produced the largest leiomyomata seen to date in this model. By contrast, no tumors formed when troglitazone was given alone or with estradiol or when troglitazone was given with estradiol and 9-cis retinoic acid. New therapies for human leiomyomata may emerge by combining antagonists for PPARgamma and retinoid X receptor alpha with selective estrogen receptor modulators.


Assuntos
Leiomiomatose/metabolismo , Miométrio/metabolismo , Proteínas de Neoplasias/metabolismo , Receptores Citoplasmáticos e Nucleares/metabolismo , Receptores do Ácido Retinoico/metabolismo , Tiazolidinedionas , Fatores de Transcrição/metabolismo , Tretinoína/metabolismo , Neoplasias Uterinas/metabolismo , Alitretinoína , Animais , Carcinógenos , Cromanos , Implantes de Medicamento , Estradiol , Feminino , Cobaias , Humanos , Leiomiomatose/induzido quimicamente , Ciclo Menstrual , Miométrio/efeitos dos fármacos , Receptor alfa de Ácido Retinoico , Tiazóis , Troglitazona , Neoplasias Uterinas/induzido quimicamente
4.
J Clin Pathol ; 48(3): 278-80, 1995 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-7730495

RESUMO

Degenerative changes are encountered relatively frequently in uterine leiomyomas. Morphologic changes within leiomyomas, particularly necrosis and alterations in cellularity, have been described following treatment with gonadotrophin releasing hormone analogue, but the effects of this form of treatment on the morphology of the normal myometrium are less well documented. A case is reported of a 42 year old woman with a history of menorrhagia in whom a combination of degenerative and iatrogenic changes resulted in a histological appearance resembling diffuse leiomyomatosis.


Assuntos
Gosserrelina/efeitos adversos , Leiomiomatose/induzido quimicamente , Miométrio/efeitos dos fármacos , Neoplasias Uterinas/induzido quimicamente , Adulto , Feminino , Humanos , Leiomiomatose/patologia , Miométrio/patologia , Neoplasias Uterinas/patologia
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