Protein expression profiles of intestinal epithelial co-cultures: effect of functionalised carbon nanotube exposure.
To assess the biological effects of low level, water dispersible, functionalised carbon nanotube (f-CNT) exposure in an in vitro model simulating the digestive tract, cellular protein expression was quantified and compared using label-free quantitative mass spectrometry (LFQMS). Co-cultured cells were exposed to well-characterised SWCNT-COOH, MWCNT-COOH, and MWCNT-PVP. The relative expression of 2,282 unique proteins was compared across the dose groups. 428 proteins were found to be differentially expressed. At the high dose, the extent of differential protein expression was CNT-specific and directly related to CNT colloidal stability. Cells responded to low level MWCNT-PVP exposure with three-fold greater differential expression. Bioinformatic analysis indicated significant and f-CNT-specific effects on relevant molecular and cellular functions and canonical pathways, with little overlap across f-CNT type and in the absence of overt toxicity.
Department of Cellular and Integrative Physiology, Indiana University School of Medicine, 1345 West 16th Street, Indianapolis IN 46202, USA, xlai@iupui.edu.
Xianyin
X
Lai
Bonnie L
BL
Blazer-Yost
James W
JW
Clack
Sharry L
SL
Fears
Somenath
S
Mitra
Susana Addo
SA
Ntim
Heather N
HN
Ringham
Frank A
FA
Witzmann
CNT; carbon nanotube; colon; in vitro; intestinal cells; label-free quantitation; mass spectrometry; poly(4-vinylpyrrolidone); proteomics