title: Immunohistochemical study of Skp2 and Jab1, two key molecules in the degradation of P27, in lung adenocarcinoma.
abstract: To clarify the association of the P27 degradation pathway proteins, Skp2 and Jab1, with the development and progression of lung adenocarcinoma (AD), we immunohistochemically investigated Skp2 and Jab1 expression together with P27- and Ki-67-labeling in 110 lung AD and 11 atypical adenomatous hyperplasia (AAH) and analyzed the relationship between the expression of these proteins and the clinicopathological factors. High Skp2 or Jab1 expression was frequent in lung AD (52/110, 47%, and 59/110, 54%, respectively), and high expression of Jab1 was also frequent in AAH (4/11, 36%), while it was not observed in normal bronchiolar epithelium. The P27 labeling index (LI) was reciprocally correlated with high Skp2 and Jab1 expression, and a higher Ki-67 LI was significantly correlated with high Skp2 and Jab1 expression. However, low P27 expression did not correlate with a higher Ki-67 LI. High Skp2 lung AD showed significant correlation with blood and lymphatic vessel invasion, which low P27 expression did not correlate with. Furthermore, high Skp2 expression in lung AD was significantly correlated with a poor outcome for patients. Thus, Skp2 and Jab1 regulate P27 degradation, and might contribute to the development and progression of lung AD through P27-mediated and -unmediated mechanisms.
authors.affiliation: Department of Human Pathology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan. akiteru@m.u-tokyo.ac.jp
authors.forename: Akiteru
authors.initials: A
authors.lastname: Goto
authors.forename: Toshiro
authors.initials: T
authors.lastname: Niki
authors.forename: Sachiko
authors.initials: S
authors.lastname: Moriyama
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Funata
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Moriyama
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nishimura
authors.forename: Rika
authors.initials: R
authors.lastname: Tsuchida
authors.forename: Jun-Ya
authors.initials: JY
authors.lastname: Kato
authors.forename: Masashi
authors.initials: M
authors.lastname: Fukayama
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism* / Q000401:mortality / Q000556:secondary; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000378:metabolism; D000075686:COP9 Signalosome Complex; D002452:Cell Count; D018797:Cell Cycle Proteins / Q000378:metabolism*; D050760:Cyclin-Dependent Kinase Inhibitor p27; D004268:DNA-Binding Proteins / Q000378:metabolism*; D018450:Disease Progression; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D047908:Intracellular Signaling Peptides and Proteins; D007564:Japan / Q000453:epidemiology; D019394:Ki-67 Antigen / Q000378:metabolism; D008175:Lung Neoplasms / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D010447:Peptide Hydrolases; D044786:S-Phase Kinase-Associated Proteins / Q000378:metabolism*; D015996:Survival Rate; D014157:Transcription Factors / Q000378:metabolism*; D025521:Tumor Suppressor Proteins / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D047908:Intracellular Signaling Peptides and Proteins; D019394:Ki-67 Antigen; D044786:S-Phase Kinase-Associated Proteins; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins; D050760:Cyclin-Dependent Kinase Inhibitor p27; D010447:Peptide Hydrolases; C501488:COPS5 protein, human; D000075686:COP9 Signalosome Complex