Insights on neoplastic stem cells from gel-based proteomics of childhood germ cell tumors.

Abstract:

BACKGROUND:Childhood germ cell tumors (cGCTs), believed to arise from transformed primordial germ cells by an unknown mechanism, provide a unique model system for investigating cell signaling, pluripotency, and the microenvironment of neoplastic stem cells (NSCs) in vivo. This is the first report of proteomics of cGCTs. PROCEDURE:Four dysgerminomas (DYSs) and four childhood endodermal sinus tumors (cESTs), resembling self-renewing and differentiating NSCs, respectively, were selected. Proteomic studies were performed by 2-DE, SDS-PAGE, and cLC/MS/MS with protein database searching. RESULTS:2-DE: 9 of 941 spots were differentially regulated with greater than a twofold change in spot volume for at least three of four gels in each group. Two of nine spots had P values for the t-test analysis of comparisons less than 0.001, while the remaining spots had P values from 0.013 to 0.191. Top-ranked proteins were identified in nine of nine spots with 4.0-38% sequence coverage. APOA1, CRK, and PDIA3 were up-regulated in cESTs. TFG, TYMP, VCP, RBBP, FKBP4, and BiP were up-regulated in DYSs. SDS-PAGE: Up-regulation of NF45 and FKBP4 was observed in four of four cESTs and DYSs, respectively. The fold-changes observed correspond with characteristic genetic changes. CONCLUSION:Differential regulation of FKBP4 and NF45, combined with previous research on immunosuppressant binding, suggests that glucocorticoid receptor signaling merits further investigation in cGCTs and NSCs.

journal_name

Pediatr Blood Cancer

journal_title

Pediatric blood & cancer

authors

Haskins WE,Eedala S,Jadhav YL,Labhan MS,Pericherla VC,Perlman EJ

doi

10.1002/pbc.23282

subject

Has Abstract

pub_date

2012-05-01 00:00:00

pages

722-8

issue

5

eissn

1545-5009

issn

1545-5017

journal_volume

58

pub_type

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