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- W1886163228 abstract "Huntingtin (HTT) is mutated in Huntington's disease but is ubiquitously expressed, and mutant HTT influences cancer progression. We investigated wild-type HTT function during breast cancer.We analyzed HTT and ZO1 expression as well as the HTT phosphoserine 421-activated form (S421-P-HTT) in human breast cancer tissues by quantitative reverse transcription polymerase chain reaction and immunohistochemistry. We performed in vitro migration and invasion assays as well as in vivo tail vein injections of the metastatic 4T1 cells in BALB/c mice (n = 11 per group). We analyzed tumor progression in knock-in mice with modified S421 crossed with the MMTV-PyVT mammary cancer model (at least n = 12 per group). Data were analyzed with unpaired t tests, analysis of variance, Pearson or Spearman correlation, and Mann Whitney or Kruskal-Wallis tests. All statistical tests were two-sided.Levels of HTT and of S421-P-HTT are abnormally low in poorly differentiated and metastatic human breast cancers. HTT expression is downregulated in invasive compared with in situ carcinoma (P < .001). In BALB/c mice, silencing of HTT promotes lung colonization by a metastatic mammary cancer cell line (P = .005) and S421-unphosphorylatable-HTT accelerates cancer progression. HTT interacts with ZO1 and regulates both its expression and its localization to tight junctions. In human breast tumors, the patterns of HTT and ZO1 expression are similar (Pearson correlation coefficient = 0.66, P < .001).HTT may inhibit breast tumor dissemination through maintenance of ZO1 at tight junctions. Downregulation of HTT transcript and protein levels is a prognostic factor for poor prognosis and metastasis development." @default.
- W1886163228 created "2016-06-24" @default.
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- W1886163228 date "2015-08-20" @default.
- W1886163228 modified "2023-10-14" @default.
- W1886163228 title "Unraveling the Role of Huntingtin in Breast Cancer Metastasis" @default.
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- W1886163228 doi "https://doi.org/10.1093/jnci/djv208" @default.
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