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2015 ; 41
(3
): 162-72
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gab.com Text
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English Wikipedia
Pulmonary preconditioning, injury, and inflammation modulate expression of the
candidate tumor suppressor gene ECRG4 in lung
#MMPMID25513848
Kao S
; Shaterian A
; Cauvi DM
; Dang X
; Chun HB
; De Maio A
; Costantini TW
; Coimbra R
; Eliceiri BP
; Baird A
Exp Lung Res
2015[Apr]; 41
(3
): 162-72
PMID25513848
show ga
PURPOSE: The human c2orf40 gene encodes a candidate tumor suppressor called
Esophageal Cancer-Related Gene-4 (ECRG4) that is a cytokine-like
epigenetically-regulated protein that is characteristically downregulated in
cancer, injury, inflammation, and infection. Here, we asked whether ECRG4 gene
expression is detectable in lung epithelial cells and if its expression changes
with inflammation, infection, and/or protective preconditioning. MATERIALS AND
METHODS: We used immunoblotting, PCR, and quantitative PCR to measure ECRG4 and
either inhalation anesthesia preconditioning, lipopolysaccharide injection, or
laparotomy to modulate lung inflammation. RESULTS: Immunoblotting establishes the
presence of the full-length 14 kDa ECRG4 peptide in mouse lung.
Immunohistochemistry localizes ECRG4 to type l alveolar epithelial cells. Basal
ECRG4 mRNA is greater than TNF-?, IL-1?, and IL-6 but following inflammatory lung
injury, TNF-?, IL-1?, IL-6, and IL-10 are upregulated while ECRG4 gene expression
is decreased. Similar findings are observed after an intravenous administration
of lipopolysaccharide. In contrast, lung preconditioning with isoflurane
anesthesia increases lung ECRG4 gene expression. Over-expression of ECRG4 in
human lung epithelial cells in vitro decreases cell proliferation implying that a
loss of ECRG4 in vivo would be permissive to cell growth. CONCLUSIONS: This study
supports the hypothesis that ECRG4 acts as a sentinel growth inhibitor in lung
alveolar epithelial cells. Its downregulation by injury, infection, and
inflammation and upregulation by preconditioning supports a role for ECRG4 in
regulating the alveolar epithelium response to injury and inflammation. By
extension, the findings support a functional consequence to its inhibition by
promoter hypermethylation (i.e. lung cancer) and suggest potential benefits to
its upregulation.