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- W2123168045 abstract "Abstract High-mobility group A2 (HMGA2) is commonly overexpressed in large leiomyomas. HMGA2 is an important regulator of cell growth, differentiation, apoptosis, and transformation. As a predicted target of Let-7 microRNAs (Let-7s), HMGA2 can be repressed by Let-7s in vitro. MicroRNA profiling analysis revealed that Let-7s were significantly dysregulated in uterine leiomyomas: high in small leiomyomas and lower in large leiomyomas. To evaluate whether Let-7 repression of HMGA2 plays a major role in leiomyomas, we analyzed the molecular relationship of HMGA2 and Let-7s, both in vitro and in vivo. We first characterized that exogenous Let-7 microRNAs could directly repress the dominant transcript of HMGA2, HMGA2a. This repression was also identified for two cryptic HMGA2 transcripts in primary leiomyoma cultures. Second, we found that the endogenous Let-7s were biologically active and played a major role in the regulation of HMGA2. Then, we illustrated that Let-7 repression of HMGA2 inhibited cellular proliferation. Finally, we examined the expression levels of Let-7c and HMGA2 in a large cohort of leiomyomas (n = 120), and we found high levels of Let-7 and low levels of HMGA2 in small leiomyomas, and low levels of Let-7 and high levels of HMGA2 in large leiomyomas. Our findings suggest that the Let-7–mediated repression of HMGA2 mechanism can be an important molecular event in leiomyoma growth. (Mol Cancer Res 2008;6(4):663–73)" @default.
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- W2123168045 date "2008-04-01" @default.
- W2123168045 modified "2023-09-23" @default.
- W2123168045 title "Antiproliferative Effects by <i>Let-7</i> Repression of High-Mobility Group A2 in Uterine Leiomyoma" @default.
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- W2123168045 doi "https://doi.org/10.1158/1541-7786.mcr-07-0370" @default.
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