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

Abstract：

BACKGROUND: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. METHODS: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. RESULTS: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 dampened Klf4 signaling network in Hhip (+/-) mice after CS exposure. CONCLUSIONS:In summary, HHIP haploinsufficiency exaggerated CS-induced airspace enlargement, which models CS-induced emphysema in human smokers carrying COPD risk alleles at the HHIP locus. Network modeling suggested rewired lymphocyte activation signaling circuits in the HHIP haploinsufficiency state.

journal_name

Genome Med

journal_title

Genome medicine

authors

Lao T,Glass K,Qiu W,Polverino F,Gupta K,Morrow J,Mancini JD,Vuong L,Perrella MA,Hersh CP,Owen CA,Quackenbush J,Yuan GC,Silverman EK,Zhou X

doi

10.1186/s13073-015-0137-3

subject

Has Abstract

pub_date

2015-02-14 00:00:00

pages

12

issue

1

issn

1756-994X

pii

137

journal_volume

7

pub_type

杂志文章

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