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Activation of the estrogen receptor contributes to the progression of pulmonary lymphangioleiomyomatosis via matrix metalloproteinase-induced cell invasiveness.

Authors: Glassberg, MK  Elliot, SJ  Fritz, J  Catanuto, P  Potier, M  Donahue, R  Stetler-Stevenson, W  Karl, M 
Citation: Glassberg MK, etal., J Clin Endocrinol Metab. 2008 May;93(5):1625-33. Epub 2008 Feb 19.
Pubmed: (View Article at PubMed) PMID:18285421
DOI: Full-text: DOI:10.1210/jc.2007-1283

CONTEXT: The role of estrogens in the pathogenesis of lymphangioleiomyomatosis (LAM), an aggressive and destructive, eventually fatal lung disease of women, is poorly understood. OBJECTIVE: The study was conducted to test the hypothesis that the lung disease in LAM is estrogen mediated and to determine whether estrogens contribute to the invasiveness of LAM. DESIGN: In vitro cell culture of spindle-shaped LAM cells (LAMD-SM) were isolated and propagated from affected lungs. Estrogen receptor (ER)-alpha and ERbeta analyses were conducted by RT-PCR. ERalpha and ERbeta, tissue inhibitor of metalloproteinase-2, and matrix metalloproteinases (MMP)-2 had Western blot analysis for protein assessment. Activity assays were performed for MT1-MMP, MMP-2, and tissue inhibitor of metalloproteinase-2. Assessment of MMP-2 promoter function was done via transfection assays. Cell invasion chambers were used to determine and quantitate cell invasiveness. SETTING: The study was conducted at an academic medical center. PATIENTS: Tissue and cells were obtained from patients as outlined in approved institution review board protocol (97/007). INTERVENTION: LAMD-SM cells were treated with a specific MMP-2 antibody or a nonspecific inhibitor, doxycycline. MAIN OUTCOME MEASURES: Activity of MMP-2 and invasiveness of LAMD-SM cells were measured. RESULTS: LAMD-SM cells express functional ERs (ERalpha and ERbeta), which undergo rapid intracellular turnover in their unbound state. 17beta-estradiol (E(2)) enhances the transcriptional ER activity. E(2)-induced ER activation increases synthesis and activity of MMP-2 through posttranscriptional mechanisms in LAMD-SM. The E(2)/ER-mediated increase of MMP-2 promotes LAMD-SM invasiveness, in assays in vitro, which can be inhibited by specific antibodies against MMP-2 or doxycycline, an inhibitor of MMPs. CONCLUSION: The invasion and destruction of lung parenchyma in LAM is, at least partially, an estrogen-MMP-driven process, which has major implications for therapeutic interventions.

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CRRD Object Information
CRRD ID: 4892300
Created: 2011-02-18
Species: All species
Last Modified: 2011-02-18
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.