title: Expression and biological role of CIP2A in human astrocytoma.
abstract: Cancerous inhibitor of protein phosphatase 2A (CIP2A) is a recently characterized oncoprotein involved in the progression of several human malignancies. The present study aimed to investigate the clinical significance and biological function of CIP2A in astrocytoma. CIP2A expression was analyzed in 135 archived astrocytoma specimens using immunohistochemistry. Of these specimens, 75 cases (55.6%) overexpressed CIP2A. The CIP2A overexpression was observed to be positively correlated with advanced tumor grade (P<0.001). siRNA-mediated knockdown of CIP2A was performed in A172 and U87 cell lines. MTT, colony formation and soft agar colony formation assays and Annexin V/propidium iodide analysis were performed to assess the role of CIP2A in cell proliferation and apoptosis. CIP2A depletion in the astrocytoma cell lines inhibited cell growth, reduced anchorage‑independent cell growth and increased apoptosis. In addition, CIP2A depletion increased caspase‑3 cleavage and downregulated c‑Myc, Bcl‑2 and phospho‑Akt expression. These results validate the role of CIP2A as a clinically relevant oncoprotein and establish CIP2A as a promising therapeutic target of astrocytoma.
authors.affiliation: Department of Neurosurgery, First Affiliated Hospital of Liaoning Medical University, Jinzhou, Liaoning 121000, PR China. yifuxin@yahoo.com.cn
authors.forename: Fuxin
authors.initials: F
authors.lastname: Yi
authors.forename: Weimin
authors.initials: W
authors.lastname: Ni
authors.forename: Weixian
authors.initials: W
authors.lastname: Liu
authors.forename: Jinyang
authors.initials: J
authors.lastname: Bai
authors.forename: Wenbin
authors.initials: W
authors.lastname: Li
mesh_terms: D000328:Adult; D017209:Apoptosis; D001254:Astrocytoma / Q000378:metabolism* / Q000473:pathology; D001324:Autoantigens / Q000378:metabolism*; D001932:Brain Neoplasms / Q000378:metabolism* / Q000473:pathology; D053148:Caspase 3 / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015536:Down-Regulation; D005260:Female; D055785:Gene Knockdown Techniques; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism*; D008875:Middle Aged; D010766:Phosphorylation; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D016271:Proto-Oncogene Proteins c-myc / Q000378:metabolism; D034741:RNA, Small Interfering / Q000378:metabolism
chemical_list: D001324:Autoantigens; C500266:CIP2A protein, human; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D016271:Proto-Oncogene Proteins c-myc; D034741:RNA, Small Interfering; D051057:Proto-Oncogene Proteins c-akt; D053148:Caspase 3