Networks inferred from biochemical data reveal profound differences in toll-like receptor and inflammatory signaling between normal and transformed hepatocytes.

TitleNetworks inferred from biochemical data reveal profound differences in toll-like receptor and inflammatory signaling between normal and transformed hepatocytes.
Publication TypeJournal Article
Year of Publication2010
AuthorsAlexopoulos, LG, Saez-Rodriguez, J, Cosgrove, BD, Lauffenburger, DA, Sorger, PK
JournalMol Cell Proteomics
Volume9
Issue9
Pagination1849-65
Date Published2010 Sep
ISSN1535-9484
KeywordsCell Line, Transformed, Hepatocytes, Humans, Inflammation, Ligands, NF-kappa B, Signal Transduction, Toll-Like Receptors
Abstract

Systematic study of cell signaling networks increasingly involves high throughput proteomics, transcriptional profiling, and automated literature mining with the aim of assembling large scale interaction networks. In contrast, functional analysis of cell signaling usually focuses on a much smaller sets of proteins and eschews computation but focuses directly on cellular responses to environment and perturbation. We sought to combine these two traditions by collecting cell response measures on a reasonably large scale and then attempting to infer differences in network topology between two cell types. Human hepatocytes and hepatocellular carcinoma cell lines were exposed to inducers of inflammation, innate immunity, and proliferation in the presence and absence of small molecule drugs, and multiplex biochemical measurement was then performed on intra- and extracellular signaling molecules. We uncovered major differences between primary and transformed hepatocytes with respect to the engagement of toll-like receptor and NF-kappaB-dependent secretion of chemokines and cytokines that prime and attract immune cells. Overall, our results serve as a proof of principle for an approach to network analysis that is systematic, comparative, and biochemically focused. More specifically, our data support the hypothesis that hepatocellular carcinoma cells down-regulate normal inflammatory and immune responses to avoid immune editing.

DOI10.1074/mcp.M110.000406
Alternate JournalMol. Cell Proteomics
PubMed ID20460255
PubMed Central IDPMC2938121
Grant ListCA112967 / CA / NCI NIH HHS / United States
GM68762 / GM / NIGMS NIH HHS / United States
P50 GM068762-07 / GM / NIGMS NIH HHS / United States