Expression profile of tuberin and some potential tumorigenic factors in 60 patients with uterine leiomyomata

Wei, Jian‐Jun; Chiriboga, Luis; Mizuguchi, Masashi; Yee, Herman; Mittal, Khush

doi:10.1038/modpathol.3800283

Cited by 41 publications

(28 citation statements)

References 40 publications

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“…Previous studies in our laboratory (5,8) and by others (7,(9)(10)(11) have indicated that the IGF-I pathway plays an important role in uterine leiomyoma development and growth. IGF-I is a single-chain polypeptide whose structure is highly similar to that of proinsulin.…”

Section: Differential Expression Of Receptor Tyrosine Kinases (Rtks) mentioning

confidence: 99%

Differential Expression of Receptor Tyrosine Kinases (RTKs) and IGF-I Pathway Activation in Human Uterine Leiomyomas

Saile

Swartz

et al. 2008

Mol Med

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Uterine leiomyomas (fibroids) are benign tumors that are prevalent in women of reproductive age. Research suggests that activated receptor tyrosine kinases (RTKs) play an important role in the enhanced proliferation observed in fibroids. In this study, a phospho-RTK array technique was used to detect RTK activity in leiomyomas compared with myometrial tissue. We found that fifteen out of seventeen RTKs evaluated in this study were highly expressed (P < 0.02-0.03) in the leiomyomas, and included the IGF-I/IGF-IR, EGF/EGFR, FGF/FGF-R, HGF/HGF-R, and PDGF/PDGF-R gene families. Due to the higher protein levels of IGF-IR observed in leiomyomas by us in earlier studies, we decided to focus on the activation of the IGF-IR, its downstream effectors, and MAPKp44/42 to confirm our earlier findings; and validate the significance of the increased IGF-IR phosphorylation observed by RTK array analysis in this study. We used immunolocalization, western blot, or immunoprecipitation studies and confirmed that leiomyomas overexpressed IGF-IRβ and phosphorylated IGF-IRβ. Additionally, we showed that the downstream effectors, Shc, Grb2, and MAPKp44/42 (P < 0.02-0.001) were also overexpressed and involved in IGF-IR signaling in these tumors, while IRS-I, PI3K, and AKT were not. In vitro studies showed that IGF-I (100 ng/mL) increased the proliferation of uterine leiomyoma cells (UtLM) (P < 0.0001), and that phosphorylated IGF-IRβ, Shc, and MAPKp44/42 were also overexpressed in IGF-I-treated UtLM cells (P < 0.05), similar to the tissue findings. A neutralizing antibody against the IGF-IRβ blocked these effects. These data indicate that overexpression of RTKs and, in particular, activation of the IGF-IR signaling pathway through Shc/Grb2/MAPK are important in mediating uterine leiomyoma growth. These data may provide new anti-tumor targets for noninvasive treatment of fibroids.

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Section: Differential Expression Of Receptor Tyrosine Kinases (Rtks) mentioning

confidence: 99%

Differential Expression of Receptor Tyrosine Kinases (RTKs) and IGF-I Pathway Activation in Human Uterine Leiomyomas

Saile

Swartz

et al. 2008

Mol Med

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“…Corepressor NCoR1 and coactivator SRC1, which are extensively expressed in the uterus [56, 58], modulate the action of SPRM-bound PRs [59]. …”

Section: Discussionmentioning

confidence: 99%

Progesterone Receptor Isoforms, Nuclear Corepressor-1 and Steroid Receptor Coactivator-1 and B-Cell Lymphoma 2 and Akt and Akt Phosphorylation Status in Uterine Myomas after Ulipristal Acetate Treatment: A Systematic Immunohistochemical Evaluation

Courtoy

Donnez

Marbaix

et al. 2017

Gynecol Obstet Invest

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Objective: To investigate whether ulipristal acetate (UPA) treatment modifies the expression of progesterone receptor (PR), its nuclear cofactors steroid receptor coactivator-1 (SRC1) and nuclear corepressor-1 (NCoR1), prosurvival factor B-cell lymphoma 2 (Bcl-2), and Akt in uterine myomas. Patients: Prospective study of 59 women with symptomatic myomas undergoing myomectomy. Forty-two patients were treated preoperatively with UPA; the remaining 17 were not and they served as controls. Method: Tissue microarrays were obtained from surgical specimens and immunohistochemistry was performed. Blinded quantification of expression of PR (PR-A vs. PR-B), coactivator SRC1 and corepressor NCoR1, and prosurvival factor Bcl-2, and Akt and evaluation of Akt phosphorylation levels. Results: Compared with the control group, UPA does not alter PR protein levels or expression patterns in myomas, and the PR-A/PR-B ratio was similar, as well as cytoplasmic or nuclear expression of cofactors SRC1 and NCoR1. Bcl-2 was heterogeneously expressed throughout the samples and no significant modification in expression was evidenced. No significant difference was found in Akt expression and phosphorylation between treated and untreated myomas. Conclusion: This study did not find any significant change in the expression of the studied factors in myomas after UPA exposure. In conclusion, various theories on myomas cells proposed on the basis of in vitro studies are not supported in vivo.

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“…Three transcriptional targets of GR (Mittelstadt and Ashwell, 2003;Phuc Le et al, 2005) appeared downregulated in FH deficiency and in leiomyomas (ABCA1, FNTA and LMO4), and GR expression was downregulated. GR is a known repressor of stem cell number and proliferation (Chebotaev et al, 2007), and has been reported to be downregulated in leiomyomas (Wei et al, 2005). Downregulation of GR signaling may thus contribute to lower differentiation phenotype in FH smooth muscle cells and to the formation of the leiomyomas.…”

Section: Srf-fos-junb Pathway In Myomasmentioning

confidence: 99%

Downregulation of SRF–FOS–JUNB pathway in fumarate hydratase deficiency and in uterine leiomyomas

et al. 2009

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Defects of metabolic enzymes result in a variety of manifestations not logically explained by the primary metabolic function. Dominant defects of fumarate hydratase (FH) result in predisposition to cutaneous and uterine leiomyomas, and renal cell cancer. FH is a metabolic enzyme of the tricarboxylic acid cycle, and its tumorsuppressor mechanism is not fully understood. We compared the consequences of FH deficiency and respiratory chain (RC) deficiency using global expression pattern of diploid primary fibroblasts. This approach utilized the information that RC defects do not seem to predispose to tumorigenesis, and the aim was to identify FH-specific signaling effects that might have relevance to tumor formation. These results were then compared to global expression patterns of FH-deficient and sporadic uterine leiomyoma data sets. We show here that FH-deficient fibroblasts share a common transcriptional fingerprint with FH-deficient and sporadic leiomyomas, highlighting the downregulation of serum response factor (SRF)-regulated transcripts, particularly the FOS-JUNB pathway. We confirmed the downregulation of this pathway at transcriptional and protein level. SRF has a fundamental function in the differentiation of smooth muscle progenitor cells, and its downregulation both in diploid FH-deficient primary fibroblasts and in leiomyomas suggests an early function in the mechanism of uterine leiomyoma formation in FH deficiency. Concordantly, the phosphorylated form of SRF, known to activate transcription, is undetectable in leiomyomas whereas clearly detected in several nuclei in the differentiated myometrium. A similar transcriptional SRFpathway fingerprint in FH-deficient and sporadic leiomyomas emphasizes the potential importance of this pathway in primary events leading to leiomyomatosis.

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Expression profile of tuberin and some potential tumorigenic factors in 60 patients with uterine leiomyomata

Cited by 41 publications

References 40 publications

Differential Expression of Receptor Tyrosine Kinases (RTKs) and IGF-I Pathway Activation in Human Uterine Leiomyomas

Differential Expression of Receptor Tyrosine Kinases (RTKs) and IGF-I Pathway Activation in Human Uterine Leiomyomas

Progesterone Receptor Isoforms, Nuclear Corepressor-1 and Steroid Receptor Coactivator-1 and B-Cell Lymphoma 2 and Akt and Akt Phosphorylation Status in Uterine Myomas after Ulipristal Acetate Treatment: A Systematic Immunohistochemical Evaluation

Downregulation of SRF–FOS–JUNB pathway in fumarate hydratase deficiency and in uterine leiomyomas

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