title: Antigen p57/Kip2 as a potential negative regulator of human astrocytoma growth.
abstract: This study was performed to determine the relationship between p57/Kip2 and the growth of human astrocytomas. Immunohistochemical staining for p57/Kip2, p53, p16, and Ki67 antigen was performed on paraffin-embedded tissue specimens obtained from 36 patients with astrocytoma. Expression of p57/Kip2, p53, p16, and Ki67 antigen was generally increased in association with the astrocytoma tumor grade. Expression of p16 was higher in patients whose tumors express p57/Kip2 in greater than 10% of tumor cells (p<0.05). Expression of p53 also tended to be higher, but not to a statistically significant extent, in patients whose tumors express p57/Kip2 in greater than 10% of tumor cells. These findings suggest that p57/Kip2 inhibits the growth of human astrocytomas, and may function in parallel with p16 and p53. However, p57/Kip2 is, by itself, insufficient to arrest the cellular proliferation of human astrocytomas.
authors.affiliation: Department of Neurosurgery, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan.
authors.forename: Kotaro
authors.initials: K
authors.lastname: Akaishi
authors.forename: Jun
authors.initials: J
authors.lastname: Nakayama
authors.forename: Keiichi
authors.initials: K
authors.lastname: Sakai
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Kobayashi
authors.forename: James T
authors.initials: JT
authors.lastname: Rutka
mesh_terms: D000328:Adult; D000970:Antineoplastic Agents / Q000627:therapeutic use; D001254:Astrocytoma / Q000145:classification / Q000188:drug therapy / Q000378:metabolism*; D001932:Brain Neoplasms / Q000145:classification / Q000188:drug therapy / Q000378:metabolism*; D019941:Cyclin-Dependent Kinase Inhibitor p16; D050761:Cyclin-Dependent Kinase Inhibitor p57 / Q000378:metabolism*; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000502:physiology*; D006801:Humans; D019394:Ki-67 Antigen / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000378:metabolism; D012189:Retrospective Studies; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; C493964:CDKN1C protein, human; C000614131:CDKN2A protein, human; D019941:Cyclin-Dependent Kinase Inhibitor p16; D050761:Cyclin-Dependent Kinase Inhibitor p57; D019394:Ki-67 Antigen; D009363:Neoplasm Proteins; D016159:Tumor Suppressor Protein p53