Haploinsufficiency of Hedgehog interacting protein causes increased emphysema induced by cigarette smoke through network rewiring.

Genome Medicine
Taotao LaoXiaobo Zhou

Abstract

The HHIP gene, encoding Hedgehog interacting protein, has been implicated in chronic obstructive pulmonary disease (COPD) by genome-wide association studies (GWAS), and our subsequent studies identified a functional upstream genetic variant that decreased HHIP transcription. However, little is known about how HHIP contributes to COPD pathogenesis. We exposed Hhip haploinsufficient mice (Hhip (+/-) ) to cigarette smoke (CS) for 6 months to model the biological consequences caused by CS in human COPD risk-allele carriers at the HHIP locus. Gene expression profiling in murine lungs was performed followed by an integrative network inference analysis, PANDA (Passing Attributes between Networks for Data Assimilation) analysis. We detected more severe airspace enlargement in Hhip (+/-) mice vs. wild-type littermates (Hhip (+/+) ) exposed to CS. Gene expression profiling in murine lungs suggested enhanced lymphocyte activation pathways in CS-exposed Hhip (+/-) vs. Hhip (+/+) mice, which was supported by increased numbers of lymphoid aggregates and enhanced activation of CD8+ T cells after CS-exposure in the lungs of Hhip (+/-) mice compared to Hhip (+/+) mice. Mechanistically, results from PANDA network analysis suggested a rewired and...Continue Reading

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Datasets Mentioned

BETA
GSE65124

Methods Mentioned

BETA
chip
MDS
enzyme-linked
Assay
bronchoalveolar
lavage
FACS
PCR
bronchoalveolar lavage
flow cytometry

Software Mentioned

GeneMANIA
DAVID
Scion image
FlowJo
Gene Expression Module
R
HOMER
Illumina GenomeStudio
MetaMorph
GeneMANIA webserver

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