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2012 ; 3
(9
): 701-13
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Cell type specificity of signaling: view from membrane receptors distribution and
their downstream transduction networks
#MMPMID22802048
He Y
; Yu Z
; Ge D
; Wang-Sattler R
; Thiesen HJ
; Xie L
; Li Y
Protein Cell
2012[Sep]; 3
(9
): 701-13
PMID22802048
show ga
Studies on cell signaling pay more attention to spatial dynamics and how such
diverse organization can relate to high order of cellular capabilities. To
overview the specificity of cell signaling, we integrated human receptome data
with proteome spatial expression profiles to systematically investigate the
specificity of receptors and receptor-triggered transduction networks across 62
normal cell types and 14 cancer types. Six percent receptors showed
cell-type-specific expression, and 4% signaling networks presented enriched
cell-specific proteins induced by the receptors. We introduced a concept of
"response context" to annotate the cell-type dependent signaling networks. We
found that most cells respond similarly to the same stimulus, as the "response
contexts" presented high functional similarity. Despite this, the subtle spatial
diversity can be observed from the difference in network architectures. The
architecture of the signaling networks in nerve cells displayed less completeness
than that in glandular cells, which indicated cellular-context dependent
signaling patterns are elaborately spatially organized. Likewise, in cancer cells
most signaling networks were generally dysfunctional and less complete than that
in normal cells. However, glioma emerged hyper-activated transduction mechanism
in malignant state. Receptor ATP6AP2 and TNFRSF21 induced rennin-angiotensin and
apoptosis signaling were found likely to explain the glioma-specific mechanism.
This work represents an effort to decipher context-specific signaling network
from spatial dimension. Our results indicated that although a majority of cells
engage general signaling response with subtle differences, the spatial dynamics
of cell signaling can not only deepen our insights into different signaling
mechanisms, but also help understand cell signaling in disease.