The
Relationship between PTEN Expression and Anoikis in Human Lung Carcinnoma Cell
Lines
LEI Qun-Ying£¬WANG Li-Ying£¬DAI Zhen-Yu£¬ZHA Xi-Liang*
( Key Laboratory of Glycoconjugate Research, Ministry of Health,
Biochemistry Department, Fudan University£¬Medical College, Shanghai 200032, China )
Abstract The
relationship between PTEN expression and anoikis in 8 different human lung carcinoma
cell (HLCC) lines, and PKB and FAK effects in the process were studied.
Northern blots and Western blots were carried out to analyze PTEN expression at
mRNA and protein levels and the phosphorylation level of PKB /FAK in HLCC
lines, and anoikis was examined by using DNA Ladder analysis. It was shown that
PTEN mRNA expression was at similar level in 8 HLCC lines. But protein
expression did not accord with it¡¯s mRNA expression. There were no PTEN protein
detectable in 95C¡¢95D and A1 cells; very low PTEN
protein was expressed in A549 and A4¡¢A7 cells; and high
PTEN protein expressed in H460 cells. There were no deletion
and point mutation in 95D and H460
cells; and mRNA stability in 95D cells was much lower than that of H460
cells. Anoikis was observed in PTEN high-expressed H460 cells with
serum lack and loss of adhesion, and 10% serum prevented it from anoikis. PTEN
decreased the phosphorylation level of PKB and down-regulated FAK expression in
HLCC. These results suggest that PTEN expression is different in 8 HLCC lines,
and PTEN was involved in anoikis.
Key words PTEN; anoikis; PKB; FAK; human lung
carcinoma cell
*Corresponding author: Tel,
86-21-64041900-2696; Fax, 86-21-67379050; e-mail, [email protected]