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2015 ; 15
(ä): 72
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Transgenically-expressed secretoglobin 3A2 accelerates resolution of
bleomycin-induced pulmonary fibrosis in mice
#MMPMID26178733
Cai Y
; Yoneda M
; Tomita T
; Kurotani R
; Okamoto M
; Kido T
; Abe H
; Mitzner W
; Guha A
; Kimura S
BMC Pulm Med
2015[Jul]; 15
(ä): 72
PMID26178733
show ga
BACKGROUND: Secretoglobin (SCGB) 3A2, a cytokine-like secretory protein of small
molecular weight, is predominantly expressed in airway epithelial cells. While
SCGB3A2 is known to have anti-inflammatory, growth factor, and anti-fibrotic
activities, whether SCGB3A2 has any other roles, particularly in lung homeostasis
and disease has not been demonstrated in vivo. The aim of this study was to
address these questions in mice. METHODS: A transgenic mouse line that expresses
SCGB3A2 in the lung using the human surfactant protein-C promoter was
established. Detailed histological, immunohistochemical, physiological, and
molecular characterization of the Scgb3a2-transgenic mouse lungs were carried
out. Scgb3a2-transgenic and wild-type mice were subjected to bleomycin-induced
pulmonary fibrosis model, and their lungs and bronchoalveolar lavage fluids were
collected at various time points during 9 weeks post-bleomycin treatment for
further analysis. RESULTS: Adult Scgb3a2-transgenic mouse lungs expressed
approximately five-fold higher levels of SCGB3A2 protein in comparison to
wild-type mice as determined by western blotting of lung tissues.
Immunohistochemistry showed that expression was localized to alveolar type II
cells in addition to airway epithelial cells, thus accurately reflecting the site
of surfactant protein-C expression. Scgb3a2-transgenic mice showed normal lung
development and histology, and no overt gross phenotypes. However, when subjected
to a bleomycin-induced pulmonary fibrosis model, they initially exhibited
exacerbated fibrosis at 3 weeks post-bleomycin administration that was more
rapidly resolved by 6 weeks as compared with wild-type mice, as determined by
lung histology, Masson Trichrome staining and hydroxyproline content,
inflammatory cell numbers, expression of collagen genes, and proinflammatory
cytokine levels. The decrease of fibrosis coincided with the increased expression
of SCGB3A2 in Scgb3a2-transgenic lungs. CONCLUSIONS: These results demonstrate
that SCGB3A2 is an anti-fibrotic agent, and suggest a possible therapeutic use of
recombinant SCGB3A2 in the treatment of pulmonary fibrosis.