Expression of EIF3-p48/INT6, TID1 and Patched in cancer, a profiling of multiple tumor types and correlation of expression.
Alterations in eIF3-p48/INT6 gene expression have been implicated in murine and human mammary carcinogenesis. We examined levels of INT6 protein in human tumors and determined that breast and colon tumors clustered into distinct groups based on levels of INT6 expression and clinicopathological variables. We performed multiplex tissue immunoblotting of breast, colon, lung, and ovarian tumor tissues and found that INT6 protein levels positively correlated with those of TID1, Patched, p53, c-Jun, and phosphorylated-c-Jun proteins in a tissue-specific manner. INT6 and TID1 showed significant positive correlation in all tissue types tested. These findings were confirmed by immunohistochemical staining of INT6 and TID1. Further evidence supporting a cooperative role for INT6 and TID1 is the presence of endogenous INT6 and TID1 proteins as complexes. We detected co-immunoprecipitation between INT6 and TID1, as well as between INT6 and Patched. These findings suggest potential integrated roles for INT6, TID1, and Patched proteins in cell growth, development, and tumorigenesis. Additionally, these data suggest that the combination of INT6, TID1, and Patched protein levels may be useful biomarkers for the development of diagnostic assays.
Traicoff
June L
JL
20/20 GeneSystems, Inc., Rockville, MD 20850, USA. june.l.traicoff@saic.com
Chung
Joon-Yong
JY
Braunschweig
Till
T
Mazo
Ilya
I
Shu
Youmin
Y
Ramesh
Arun
A
D'Amico
Mark W
MW
Galperin
Mikhail M
MM
Knezevic
Vladimir
V
Hewitt
Stephen M
SM
D014408:Biomarkers, Tumor / Q000235:genetics / Q000378:metabolism*; D039621:Eukaryotic Initiation Factor-3 / Q000378:metabolism*; D015972:Gene Expression Regulation, Neoplastic; D050956:HSP40 Heat-Shock Proteins / Q000378:metabolism*; D006801:Humans; D009369:Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D000072079:Patched Receptors; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000378:metabolism*
D014408:Biomarkers, Tumor; C120664:DNAJA3 protein, human; D039621:Eukaryotic Initiation Factor-3; D050956:HSP40 Heat-Shock Proteins; D000072079:Patched Receptors; D011518:Proto-Oncogene Proteins; D011956:Receptors, Cell Surface