Disruption of Abi1/Hssh3bp1 expression induces prostatic intraepithelial neoplasia in the conditional Abi1/Hssh3bp1 KO mice.

Disruption of Abi1/Hssh3bp1 expression induces prostatic intraepithelial neoplasia in the conditional Abi1/Hssh3bp1 KO mice.
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Abi1/Hssh3bp1 表达的破坏会在条件性 Abi1/Hssh3bp1 KO 小鼠中诱导前列腺上皮内瘤变。

DOI:
10.1038/oncsis.2012.28
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发表时间:
2012
期刊:
影响因子:
6.2
通讯作者:
Kotula,L
Kotula,L
中科院分区:
医学1区
文献类型:
--
作者:
Xiong,X;Chorzalska,A;Dubielecka,PM;White,JR;Vedvyas,Y;Hedvat,CV;Haimovitz-Friedman,A;Koutcher,JA;Reimand,J;Bader,GD;Sawicki,JA;Kotula,L

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前列腺癌是美国癌症相关死亡的主要原因之一,也是美国男性中主要的非皮肤癌。前列腺肿瘤发生的基因突变包括肿瘤抑制基因的改变。我们通过在患者的原发性前列腺肿瘤中寻找基因突变,并通过分析小鼠Abi1/Hssh3bp1直系同源物的前列腺特异性破坏的后果,来测试ABI1/HSSH3BP1的肿瘤抑制假说。我们对ABI1/hSSH3BP1基因进行了测序,并在35例前列腺肿瘤中的6例中鉴定了复发突变。此外,使用含有功能丧失Abi 1突变和稳定表达的野生型或突变型ABI基因的LNCaP细胞系进行的互补和非贴壁依赖性生长、增殖、细胞粘附和异种移植试验与肿瘤抑制假说一致。为了进一步验证这一假设,我们通过用probasin启动子驱动的Cre重组酶菌株培育Abi1 floxed菌株来破坏小鼠前列腺中的基因。小鼠的组织学评价表明,早在第8个月Abi 1/Hssh3bp1基因敲除小鼠中就发生了前列腺上皮内瘤变(PIN),但在12个月大的小鼠中没有观察到超过PIN的进展。在小鼠前列腺中观察到的E-钙粘蛋白、β-连环蛋白和WAVE 2水平的降低表明异常细胞粘附是由于Abi 1破坏导致的PIN发展的潜在机制。同源细胞系的分析指出磷酸化Akt的上调是缺乏Abi 1的细胞的增强的细胞增殖表型的基础。这项研究为Abi1下调在前列腺癌发展中起作用的假设提供了概念验证。
Prostate cancer is one of the leading causes of cancer-related deaths in the United States and a leading diagnosed non-skin cancer in American men. Genetic mutations underlying prostate tumorigenesis include alterations of tumor suppressor genes. We tested the tumor suppressor hypothesis for ABI1/hSSH3BP1 by searching for gene mutations in primary prostate tumors from patients, and by analyzing the consequences of prostate-specific disruption of the mouse Abi1/Hssh3bp1 ortholog. We sequenced the ABI1/hSSH3BP1 gene and identified recurring mutations in 6 out of 35 prostate tumors. Moreover, complementation and anchorage-independent growth, proliferation, cellular adhesion and xenograft assays using the LNCaP cell line, which contains a loss-of-function Abi1 mutation, and a stably expressed wild-type or mutated ABI gene, were consistent with the tumor suppressor hypothesis. To test the hypothesis further, we disrupted the gene in the mouse prostate by breeding the Abi1 floxed strain with the probasin promoter-driven Cre recombinase strain. Histopathological evaluation of mice indicated development of prostatic intraepithelial neoplasia (PIN) in Abi1/Hssh3bp1 knockout mouse as early as the eighth month, but no progression beyond PIN was observed in mice as old as 12 months. Observed decreased levels of E-cadherin, β-catenin and WAVE2 in mouse prostate suggest abnormal cellular adhesion as the mechanism underlying PIN development owing to Abi1 disruption. Analysis of syngeneic cell lines point to the possibility that upregulation of phospho-Akt underlies the enhanced cellular proliferation phenotype of cells lacking Abi1. This study provides proof-of-concept for the hypothesis that Abi1 downregulation has a role in the development of prostate cancer.
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