國家衛生研究院 NHRI:Item 3990099045/12191
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/12191


    Title: The differential distributions of ASPM isoforms and their roles in Wnt signaling, cell cycle progression, and pancreatic cancer prognosis
    Authors: Hsu, CC;Liao, WY;Chan, TS;Chen, WY;Lee, CT;Shan, YS;Huang, PJ;Hou, YC;Li, CR;Tsai, KK
    Contributors: National Institute of Cancer Research
    Abstract: Pancreatic ductal adenocarcinoma (PDAC) is a highly aggressive and treatment-resistant malignancy. The lack of pathway-informed biomarkers hampers the development of rational diagnostics or therapies. Recently, the protein abnormal spindle-like microcephaly associated (ASPM) was identified as a novel Wnt and stemness regulator in PDAC, while the pathogenic roles of its protein isoforms remain unclarified. We developed novel isoform-specific antibodies and genetic knockdown (KD) of putative ASPM isoforms, whereby we uncovered that the levels of ASPM isoform 1 (iI) and ASPM-iII are variably up-regulated in PDAC cells. ASPM isoforms show remarkably different subcellular locations; specifically, ASPM-iI is exclusively localized to the cortical cytoplasm of PDAC cells while ASPM-iII is predominantly expressed in cell nuclei. Mechanistically, ASPM-iI colocalizes with disheveled-2 and active beta-catenin as well as the stemness marker aldehyde dehydrogenase-1 (ALDH-1), and its expression is indispensable for the Wnt activity, stemness and the tumorigenicity of PDAC cells. By contrast, ASPM-iII selectively regulates the expression level of cyclin E and cell cycle progression in PDAC cells. The expression of ASPM-iI and ASPM-iII display considerable intratumoral heterogeneity in PDAC tissues and only that of ASPM-iI was prognostically significant; it outperformed ALDH-1 staining and clinico-pathological variables in a multivariant analysis. Collectively, the distinct expression patterns and biological functions of ASPM isoforms may illuminate novel molecular mechanisms and prognosticators in PDAC and may pave the road for the development of therapies targeting this novel oncoprotein.
    Date: 2019-12
    Relation: Journal of Pathology. 2019 Dec;249(4):498-508.
    Link to: http://dx.doi.org/10.1002/path.5341
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0022-3417&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000494146500001
    Cited Times(Scopus): https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85074601501
    Appears in Collections:[Kelvin Kun-Chih Tsai] Periodical Articles

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