ABSTRACT
Uterine leiomyomas are highly prevalent and symptomatic tumors of women in their reproductive
years. The morbidity caused by these tumors is directly related to increasing size.
Leiomyoma cells do not rapidly proliferate; instead, the tumors grow primarily due
to excessive production of disorganized extracellular matrix (ECM). The aberrant ECM
results from excessive production of collagen subtypes and proteoglycans, increased
profibrotic cytokines including transforming growth factors β1 and β3, and decreased
or disrupted matrix metalloproteinases. These alterations result in the development
of an ECM that is exceptionally stable. As a result, therapeutic interventions must
redirect leiomyoma cells toward extracellular matrix dissolution, rather than solely
inhibiting cell proliferation. Gonadotropin-releasing hormone analogues and selective
progesterone receptor modulators with demonstrated clinical efficacy provide such
a change in abnormal extracellular matrix formation by leiomyoma cells, inhibiting
and reversing the fibrotic process. Novel therapies using pathways distinct from gonadal
hormones, including antifibrotics, retinoic acid, peroxisome-proliferator-activated
receptor γ ligands, and curcumin, provide promise for a future with improved therapeutic
options for women suffering from uterine leiomyomas.
KEYWORDS
Uterine leiomyoma - extracellular matrix - collagen - proteoglycan - transforming
growth factor (TGF)
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William H CatherinoM.D. Ph.D.
Department of Obstetrics and Gynecology, Building A, Room 3078, Uniformed Services
University of the Health Sciences
4301 Jones Bridge Road, Bethesda, MD 20814-4799
Email: wcatherino@usuhs.mil