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2.
Biomed Res Int ; 2017: 5316845, 2017.
Article de Anglais | MEDLINE | ID: mdl-29082249

RÉSUMÉ

The role of the extracellular matrix (ECM) in uterine fibroids (UF) has recently been appreciated. Overhydroxylation of lysine residues and the subsequent formation of hydroxylysylpyridinoline (HP) and lysylpyridinoline (LP) cross-links underlie the ECM stiffness and profoundly affect tumor progression. The aim of the current study was to investigate the relationship between ECM of UF, collagen and collagen cross-linking enzymes [lysyl hydroxylases (LH) and lysyl oxidases (LOX)], and the development and progression of UF. Our results indicated that hydroxyl lysine (Hyl) and HP cross-links are significantly higher in UF compared to the normal myometrial tissues accompanied by increased expression of LH (LH2b) and LOX. Also, increased resistance to matrix metalloproteinases (MMP) proteolytic degradation activity was observed. Furthermore, the extent of collagen cross-links was positively correlated with the expression of myofibroblast marker (α-SMA), growth-promoting markers (PCNA; pERK1/2; FAKpY397; Ki-67; and Cyclin D1), and the size of UF. In conclusion, our study defines the role of overhydroxylation of collagen and collagen cross-linking enzymes in modulating UF cell proliferation, differentiation, and resistance to MMP. These effects can establish microenvironment conducive for UF progression and thus represent potential target treatment options of UF.


Sujet(s)
Matrice extracellulaire/métabolisme , Léiomyome/métabolisme , Procollagen-lysine, 2-oxoglutarate 5-dioxygenase/métabolisme , Lysyloxidase/métabolisme , Tumeurs de l'utérus/métabolisme , Adulte , Acides aminés/biosynthèse , Collagène/métabolisme , Matrice extracellulaire/composition chimique , Femelle , Régulation de l'expression des gènes tumoraux/génétique , Humains , Hydroxylation , Léiomyome/enzymologie , Léiomyome/génétique , Léiomyome/anatomopathologie , Lysine/métabolisme , Matrix metalloproteinases/composition chimique , Matrix metalloproteinases/métabolisme , Protéines tumorales/génétique , Procollagen-lysine, 2-oxoglutarate 5-dioxygenase/composition chimique , Lysyloxidase/composition chimique , Tumeurs de l'utérus/enzymologie , Tumeurs de l'utérus/génétique , Tumeurs de l'utérus/anatomopathologie
3.
AJP Rep ; 6(4): e445-e450, 2016 Oct.
Article de Anglais | MEDLINE | ID: mdl-28050333

RÉSUMÉ

Endometrial ablation offers symptomatic relief for menorrhagia. Pregnancy after ablation is rare but is often complicated due to pregnancy loss, growth restriction, preterm premature rupture of membranes, preterm delivery, and morbidly adherent placentation, a dangerous complication that can result in hemorrhage, intensive care unit admission, and cesarean hysterectomy. We report a case of pregnancy conceived contemporaneously with endometrial ablation and tubal occlusion. Diagnosis of pregnancy was delayed due to low suspicion. Complications included cervical implantation and placenta percreta, necessitating hysterectomy with the fetus in situ. Intraoperatively, incomplete uterine rupture was noted. Abnormal neovascularization, fibrous adhesions, and anatomical distortion necessitated a complex surgical approach. Women undergoing endometrial ablation must be thoroughly counseled about the serious risks of postablation pregnancy, the need for contraception, and the risk of sterilization failure. Pregnancy should remain in the differential diagnosis for women of reproductive age, regardless of tubal occlusion. Cases of placenta percreta should be referred early to centers of excellence with multidisciplinary teams.

4.
Am J Obstet Gynecol ; 212(2): 218.e1-9, 2015 Feb.
Article de Anglais | MEDLINE | ID: mdl-25173187

RÉSUMÉ

OBJECTIVE: The purpose of this study was to test the hypothesis that a standardized multidisciplinary treatment approach in patients with morbidly adherent placenta, which includes accreta, increta, and percreta, is associated with less maternal morbidity than when such an approach is not used (nonmultidisciplinary approach). STUDY DESIGN: A retrospective cohort study was conducted with patients from 3 tertiary care hospitals from July 2000 to September 2013. Patients with histologically confirmed placenta accreta, increta, and percreta were included in this study. A formal program that used a standardized multidisciplinary management approach was introduced in 2011. Before 2011, patients were treated on a case-by-case basis by individual physicians without a specific protocol (nonmultidisciplinary group). Estimated blood loss, transfusion of packed red blood cells, intraoperative complications (eg, vascular, bladder, ureteral, and bowel injury), neonatal outcome, and maternal postoperative length of hospital stay were compared between the 2 groups. RESULTS: Of 90 patients with placenta accreta, 57 women (63%) were in the multidisciplinary group, and 33 women (37%) were in the nonmultidisciplinary group. The multidisciplinary group had more cases with percreta (P = .008) but experienced less estimated blood loss (P = .025), with a trend to fewer blood transfusions (P = .06), and were less likely to be delivered emergently (P = .001) compared with the nonmultidisciplinary group. Despite an approach of indicated preterm delivery at 34-35 weeks of gestation, neonatal outcomes were similar between the 2 groups. CONCLUSION: The institution of a standardized approach for patients with morbidly adherent placentation by a specific multidisciplinary team was associated with improved maternal outcomes, particularly in cases with more aggressive placental invasion (increta or percreta), compared with a historic nonmultidisciplinary approach. Our standardized approach was associated with fewer emergency deliveries.


Sujet(s)
Césarienne/méthodes , Protocoles cliniques , Hystérectomie/méthodes , Placenta accreta/chirurgie , Rétention placentaire/chirurgie , Adulte , Perte sanguine peropératoire/statistiques et données numériques , Études de cohortes , Transfusion d'érythrocytes/statistiques et données numériques , Femelle , Humains , Durée du séjour/statistiques et données numériques , Adulte d'âge moyen , Grossesse , Études rétrospectives , Jeune adulte
5.
J Clin Endocrinol Metab ; 99(10): 3790-9, 2014 Oct.
Article de Anglais | MEDLINE | ID: mdl-24471565

RÉSUMÉ

CONTEXT: Proliferating cells reprogram their cellular glucose metabolism to meet the bioenergetic and biosynthetic demands and to maintain cellular redox homeostasis. Pyruvate kinase M (PKM) is a critical regulator of this metabolic reprogramming. However, whether estradiol-17ß (E2) reprograms cellular metabolism to support proliferation of human primary endometrial stromal cells (hESCs) and the molecular basis of this reprogramming are not well understood. OBJECTIVES: Our objectives were to study whether E2 induces reprogramming of glucose metabolism in hESCs and to investigate the potential roles of PKM2 in E2-induced metabolic reprogramming and proliferation of these cells. METHODS: The oxygen consumption rate and extracellular acidification rate were assessed by a Seahorse XF24 analyzer. PKM2 expression was assessed by real-time RT-PCR and immunoblotting. RESULTS: E2 induces a Warburg-like glucose metabolism in hESCs by inducing the expression of PKM. E2 also enhanced PKM splicing into the PKM2 isoform by upregulating the c-Myc-hnRNP axis. Furthermore, E2 induces PKM2 oxidation, phosphorylation, and nuclear translocation. In addition to its glycolytic function, PKM2 physically interacted with estrogen receptor-α (ERα) and functioned as an ERα coactivator. Small-molecule PKM2 activators ameliorated ERα transcriptional activity and abrogated the E2-induced hESC proliferation. CONCLUSIONS: We show for the first time that E2-induced hESC proliferation is associated with a shift in glucose metabolism toward aerobic glycolysis, and the molecular basis for this metabolic shift is linked to the effects of E2 on PKM2. In addition, PKM2 acts as a transcriptional coactivator for ERα and small-molecule PKM2 activators inhibit ERα transcriptional activity and reduce E2-induced cell proliferation.


Sujet(s)
Oestradiol/physiologie , Récepteur alpha des oestrogènes/métabolisme , Pyruvate kinase/métabolisme , Cellules stromales/métabolisme , Épissage alternatif/effets des médicaments et des substances chimiques , Épissage alternatif/physiologie , Prolifération cellulaire/effets des médicaments et des substances chimiques , Prolifération cellulaire/physiologie , Reprogrammation cellulaire/effets des médicaments et des substances chimiques , Reprogrammation cellulaire/physiologie , Endomètre/cytologie , Oestradiol/pharmacologie , Récepteur alpha des oestrogènes/génétique , Oestrogènes/pharmacologie , Oestrogènes/physiologie , Femelle , Glucose/métabolisme , Humains , Acide lactique/métabolisme , Mitogènes/métabolisme , Consommation d'oxygène/effets des médicaments et des substances chimiques , Consommation d'oxygène/physiologie , Culture de cellules primaires , Pyruvate kinase/génétique , Transduction du signal/effets des médicaments et des substances chimiques , Transduction du signal/physiologie , Cellules stromales/cytologie , Cellules stromales/effets des médicaments et des substances chimiques , Transcription génétique/effets des médicaments et des substances chimiques , Transcription génétique/physiologie
6.
Fertil Steril ; 98(1): 178-84, 2012 Jul.
Article de Anglais | MEDLINE | ID: mdl-22579131

RÉSUMÉ

OBJECTIVE: To investigate the effects and the mechanism of action of 2-methoxyestradiol (2ME(2)) on transforming growth factor (TGF) ß3-induced profibrotic response in immortalized human uterine fibroid smooth muscle (huLM) cells. DESIGN: Laboratory study. SETTING: University research laboratory. PATIENTS(S): Not applicable. INTERVENTIONS(S): Not applicable. MAIN OUTCOME MEASURE(S): huLM cells were treated with TGF-ß3 (5 ηg/mL) in the presence or absence of specific Smad3 inhibitor SIS3 (1 µmol/L), inhibitor of the PI3K/Akt (LY294002, 10 µmol/L), or 2ME(2) (0.5 µmol/L), and the expression of collagen (Col) type I(αI), Col III(αI), plasminogen activator inhibitor (PAI) 1, connective tissue growth factor (CTGF), and α-smooth muscle actin (α-SMA) were determined by real-time reverse-transcription polymerase chain reaction and immunoblotting. The effect of 2ME(2) on Smad-microtubule binding was evaluated by coimmunoprecipitation. RESULT(S): Our data revealed that TGF-ß3-induced fibrogenic response in huLM is mediated by both Smad-dependent and Smad-independent PI3K/Akt/mTOR signaling pathways. 2ME(2) abrogates TGF-ß3-induced expression of Col I(αI), Col III(αI), PAI-1, CTGF, and α-SMA. Molecularly, 2ME(2) ameliorates TGF-ß3-induced Smad2/3 phosphorylation and nuclear translocation. In addition, 2ME(2) inhibits TGF-ß3-induced activation of the PI3K/Akt/mTOR pathway. CONCLUSION(S): TGF-ß3-induced profibrotic response in fibroid cells is mediated by Smad-dependent and Smad-independent PI3K/Akt/mTOR pathways. 2ME(2) inhibits TGF-ß3 profibrotic effects in huLM cells by ameliorating both Smad-dependent and Smad-independent signaling pathways.


Sujet(s)
Oestradiol/analogues et dérivés , Léiomyome/anatomopathologie , Protéines Smad/métabolisme , Facteur de croissance transformant bêta-3/antagonistes et inhibiteurs , Facteur de croissance transformant bêta-3/métabolisme , 2-Méthoxyestradiol , Lignée de cellules transformées , Noyau de la cellule/effets des médicaments et des substances chimiques , Noyau de la cellule/métabolisme , Régulation négative/effets des médicaments et des substances chimiques , Régulation négative/génétique , Évaluation préclinique de médicament , Oestradiol/pharmacologie , Femelle , Fibrose/métabolisme , Fibrose/anatomopathologie , Humains , Léiomyome/génétique , Léiomyome/métabolisme , Phosphorylation/effets des médicaments et des substances chimiques , Liaison aux protéines/effets des médicaments et des substances chimiques , Transport des protéines/effets des médicaments et des substances chimiques , Transduction du signal/effets des médicaments et des substances chimiques , Transduction du signal/génétique , Protéines Smad/génétique , Facteur de croissance transformant bêta-3/physiologie , Tubuline/métabolisme
7.
J Steroid Biochem Mol Biol ; 126(3-5): 78-86, 2011 Sep.
Article de Anglais | MEDLINE | ID: mdl-21600284

RÉSUMÉ

Selective estrogen receptor modulators (SERMs) demonstrate differential endometrial cancer (EC) risk. While tamoxifen (TAM) use increases the risk of endometrial hyperplasia and malignancy, raloxifene (RAL) has neutral effects on the uterus. How TAM increases the risk of EC and why TAM and RAL differentially modulate the risk for EC, however, remain elusive. Here, we tested the hypothesis that TAM increases the risk for EC, at least in part, by enhancing the local estrogen biosynthesis and directing estrogen metabolism towards the formation of genotoxic and hormonally active estrogen metabolites. In addition, the differential effects of TAM and RAL in EC risk are attributed to their differential effect on estrogen metabolism/metabolites. The endometrial cancer cell line (Ishikawa cells) and the nonmalignant immortalized human endometrial glandular cell line (EM1) were used for the study. The profile of estrogen/estrogen metabolites (EM), depurinating estrogen-DNA adducts, and the expression of estrogen-metabolizing enzymes in cells treated with 17ß-estradiol (E2) alone or in combination with TAM or RAL were investigated using high performance liquid chromatography-electrospray ionization-tandem mass spectrometry (HPLC-ESI-MS(2)), ultraperformance liquid chromatography/tandem mass spectrometry (UPLC-MS/MS), and Western blot analysis, respectively. TAM significantly increased the total EM and enhanced the formation of hormonally active and carcinogenic estrogen metabolites, 4-hydroxestrone (4-OHE1) and 16α-hydroxyestrone, with concomitant reduction in the formation of antiestrogenic and anticarcinogenic 2-hydroxyestradiol and 2-methoxyestradiol. Furthermore, TAM increased the formation of depurinating estrogen-DNA adducts 4-OHE1 [2]-1-N7Guanine and 4-OHE1 [2]-1-N3 Adenine. TAM-induced alteration in EM and depurinating DNA adduct formation is associated with altered expression of estrogen metabolizing enzymes CYP1A1, CYP1B1, COMT, NQO1, and SF-1 as revealed by Western blot analysis. In contrast to TAM, RAL has minimal effect on EM, estrogen-DNA adduct formation, or estrogen-metabolizing enzymes expression. These data show that TAM perturbs the balance of estrogen-metabolizing enzymes and alters the disposition of estrogen metabolites, which can explain, at least in part, the mechanism for TAM-induced EC. These results also implicate the differential effect of TAM and RAL on estrogen metabolism/metabolites as a potential mechanism for their disparate effects on the endometrium.


Sujet(s)
Carcinomes/étiologie , Tumeurs de l'endomètre/étiologie , Oestrogènes/métabolisme , Chlorhydrate de raloxifène/pharmacologie , Tamoxifène/pharmacologie , Carcinomes/induit chimiquement , Cellules cultivées , Adduits à l'ADN/métabolisme , Relation dose-effet des médicaments , Association médicamenteuse , Tumeurs de l'endomètre/induit chimiquement , Oestradiol/métabolisme , Oestradiol/pharmacologie , Antagonistes des oestrogènes/effets indésirables , Antagonistes des oestrogènes/pharmacologie , Femelle , Humains , Voies et réseaux métaboliques/effets des médicaments et des substances chimiques , Chlorhydrate de raloxifène/effets indésirables , Facteurs de risque , Modulateurs sélectifs des récepteurs des oestrogènes/effets indésirables , Modulateurs sélectifs des récepteurs des oestrogènes/pharmacologie , Tamoxifène/effets indésirables
8.
Transl Oncol ; 3(3): 170-5, 2010 Jun 01.
Article de Anglais | MEDLINE | ID: mdl-20563258

RÉSUMÉ

Cervical cancer is known to metastasize primarily by the lymphatic system. Dissemination through lymphatic vessels represents an early step in regional tumor progression, and the presence of lymphatic metastasis is associated with a poor prognosis. In patients who have undergone a radical hysterectomy, lymphovascular space invasion (LVSI), assessed on hematoxylin and eosin-stained slides, is a major factor for adjuvant therapy in patients with cervical cancer. With the advent of a lymphatic endothelial cell-specific marker, such as D2-40, it is now possible to distinguish between blood and lymphatic space invasion (LSI). In this study, the utility of D2-40 was assessed for the detection of lymphatic vessel density (LVD) and identification of LSI. The expressions of vascular endothelial growth factor receptor-3 (VEGFR-3), VEGF-C, tyrosine receptor kinase-2, and angiopoietin-1 were assessed by immunohistochemical methods on 50 patients with squamous cell carcinoma of the cervix. Clinicopathologic characteristics, including pelvic lymph node metastasis, were correlated with the above histochemical findings. We found that lymphangiogenesis, measured by an increase in peritumoral LVD, was significantly associated with positive lymph node status (P < .005). VEGFR-3 expression was significantly associated with LVD (P < .05). D2-40 staining verified LSI (P = .03) and surpassed that of hematoxylin and eosin-identified LVSI (P = .54). In conclusion, lymphangiogenic markers, specifically LVD quantified by D2-40 and VEGFR-3, are independently associated with LSI and lymph node metastasis in patients with early squamous cell carcinoma of the cervix treated with radical hysterectomy and pelvic lymphadenectomy.

9.
PLoS One ; 4(10): e7356, 2009 Oct 07.
Article de Anglais | MEDLINE | ID: mdl-19809499

RÉSUMÉ

CONTEXT: Development of optimal medicinal treatments of uterine leiomyomas represents a significant challenge. 2-Methoxyestradiol (2ME) is an endogenous estrogen metabolite formed by sequential action of CYP450s and catechol-O-methyltransferase (COMT). Our previous study demonstrated that 2ME is a potent antiproliferative, proapoptotic, antiangiogenic, and collagen synthesis inhibitor in human leiomyomas cells (huLM). OBJECTIVES: Our objectives were to investigate whether COMT expression, by the virtue of 2ME formation, affects the growth of huLM, and to explore the cellular and molecular mechanisms whereby COMT expression or treatment with 2ME affect these cells. RESULTS: Our data demonstrated that E(2)-induced proliferation was less pronounced in cells over-expressing COMT or treated with 2ME (500 nM). This effect on cell proliferation was associated with microtubules stabilization and diminution of estrogen receptor alpha (ERalpha) and progesterone receptor (PR) transcriptional activities, due to shifts in their subcellular localization and sequestration in the cytoplasm. In addition, COMT over expression or treatment with 2ME reduced the expression of hypoxia-inducible factor -1alpha (HIF-1 alpha) and the basal level as well as TNF-alpha-induced aromatase (CYP19) expression. CONCLUSIONS: COMT over expression or treatment with 2ME stabilize microtubules, ameliorates E(2)-induced proliferation, inhibits ERalpha and PR signaling, and reduces HIF-1 alpha and CYP19 expression in human uterine leiomyoma cells. Thus, microtubules are a candidate target for treatment of uterine leiomyomas. In addition, the naturally occurring microtubule-targeting agent 2ME represents a potential new therapeutic for uterine leiomyomas.


Sujet(s)
Catechol O-methyltransferase/biosynthèse , Oestradiol/analogues et dérivés , Léiomyome/métabolisme , Microtubules/métabolisme , Récepteurs aux stéroïdes/métabolisme , 2-Méthoxyestradiol , Apoptose , Aromatase/métabolisme , Oestradiol/métabolisme , Récepteur alpha des oestrogènes/métabolisme , Femelle , Humains , Néovascularisation pathologique , Récepteurs à la progestérone/métabolisme , Transduction du signal , Facteur de nécrose tumorale alpha/métabolisme , Tumeurs de l'utérus/métabolisme
10.
BMC Bioinformatics ; 10: 66, 2009 Feb 20.
Article de Anglais | MEDLINE | ID: mdl-19232110

RÉSUMÉ

BACKGROUND: We introduce Approximate Entropy as a mathematical method of analysis for microarray data. Approximate entropy is applied here as a method to classify the complex gene expression patterns resultant of a clinical sample set. Since Entropy is a measure of disorder in a system, we believe that by choosing genes which display minimum entropy in normal controls and maximum entropy in the cancerous sample set we will be able to distinguish those genes which display the greatest variability in the cancerous set. Here we describe a method of utilizing Approximate Sample Entropy (ApSE) analysis to identify genes of interest with the highest probability of producing an accurate, predictive, classification model from our data set. RESULTS: In the development of a diagnostic gene-expression profile for cervical intraepithelial neoplasia (CIN) and squamous cell carcinoma of the cervix, we identified 208 genes which are unchanging in all normal tissue samples, yet exhibit a random pattern indicative of the genetic instability and heterogeneity of malignant cells. This may be measured in terms of the ApSE when compared to normal tissue. We have validated 10 of these genes on 10 Normal and 20 cancer and CIN3 samples. We report that the predictive value of the sample entropy calculation for these 10 genes of interest is promising (75% sensitivity, 80% specificity for prediction of cervical cancer over CIN3). CONCLUSION: The success of the Approximate Sample Entropy approach in discerning alterations in complexity from biological system with such relatively small sample set, and extracting biologically relevant genes of interest hold great promise.


Sujet(s)
Analyse de profil d'expression de gènes/méthodes , Dysplasie du col utérin/génétique , Tumeurs du col de l'utérus/génétique , Analyse de regroupements , Entropie , Femelle , Humains , Modèles théoriques , Séquençage par oligonucléotides en batterie/méthodes , Tumeurs du col de l'utérus/diagnostic , Dysplasie du col utérin/diagnostic
11.
J Clin Endocrinol Metab ; 94(1): 285-93, 2009 Jan.
Article de Anglais | MEDLINE | ID: mdl-18957495

RÉSUMÉ

CONTEXT: Estrogen and its metabolites play a critical role in the pathophysiology of the endometrium. The bioavailability of estrogen and estrogen metabolites in endometrial tissues depends on the expression of enzymes involved in estrogen biosynthesis and metabolism. Substantial evidence indicates that estrogen-dependent endometrial disorders are also associated with proinflammatory milieu. However, the mechanism whereby inflammation contributes to these conditions is not known. OBJECTIVE: The objective of the study was to investigate the effect of TNF-alpha on estrogen metabolism and the expression of estrogen-metabolizing genes in human endometrial glandular epithelial cells (EM1). DESIGN: EM1 were treated with 17beta-estradiol (E2) with or without TNF-alpha. Capillary liquid chromatography-tandem mass spectrometry analysis was used for quantitative measurement of estrogens and estrogen metabolites. Western blot analysis, reporter gene assay, and real-time RT-PCR were used to assess the expression of estrogen-metabolizing genes. RESULTS: TNF-alpha treatment significantly increased the level of total estrogen and estrogen metabolites and significantly increased the rate of conversion of estrone (E1) into E2. TNF-alpha also enhanced the oxidative metabolism of estrogen into catecholestrogens with concomitant inhibition of their conversion into methoxyestrogens. Gene expression analysis revealed that TNF-alpha induced the expression of genes involved in E2 biosynthesis (steroidogenic factor-1 and aromatase) and activation (17beta- hydroxysteroid dehydrogenase type 1 and cytochrome P-450, 1B1) with simultaneous repression of genes involved in estrogen inactivation (17beta-hydroxysteroid dehydrogenase type 2; catechol O-methyltransferase; and nicotinamide adenine dinucleotide phosphate-quinone oxidoreductase 1). CONCLUSION: TNF-alpha increases the local estrogen biosynthesis in human endometrial glandular cells and directs estrogen metabolism into more hormonally active and carcinogenic metabolites. These effects may impact many physiological and pathological processes that occur within the endometrium.


Sujet(s)
Endomètre/métabolisme , Oestrogènes/métabolisme , Facteur de nécrose tumorale alpha/pharmacologie , Aromatase/génétique , Aryl hydrocarbon hydroxylases , Catechol O-methyltransferase/génétique , Lignée cellulaire , Cytochrome P-450 CYP1A1/génétique , Cytochrome P-450 CYP1B1 , Cytochrome P-450 enzyme system/génétique , Endomètre/cytologie , Oestradiol/pharmacologie , Oestradiol dehydrogenases/génétique , Femelle , Régulation de l'expression des gènes/effets des médicaments et des substances chimiques , Humains , NADPH dehydrogenase (quinone)/génétique , Facteur stéroïdogène-1/génétique
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