title: Stat3 downstream gene product chitinase 3-like 1 is a potential biomarker of inflammation-induced lung cancer in multiple mouse lung tumor models and humans.
abstract: Over-activation of the signal transducers and activators of the transcription 3 (Stat3) pathway in lung alveolar type II (AT II) epithelial cells induces chronic inflammation and adenocarcinoma in the lung of CCSP-rtTA/(tetO)7-CMV-Stat3C bitransgenic mice. One of Stat3 downstream genes products, chitinase 3-like 1 (CHI3L1) protein, showed increased concentration in both bronchioalveolar lavage fluid (BALF) and blood of doxycycline-treated CCSP-rtTA/(tetO)7-CMV-Stat3C bitransgenic mice. When tested in other inflammation-induced lung cancer mouse models, the CHI3L1 protein concentration was also highly increased in BALF and blood of these models with tumors. Immunohistochemical staining showed strong staining of CHI3L1 protein around tumor areas in these mouse models. Analysis of normal objects and lung cancer patients revealed a significant elevation of CHI3L1 protein concentration in human serum samples from all categories of lung cancers. Furthermore, recombinant CHI3L protein stimulated proliferation and growth of Lewis lung cancer cells. Therefore, secretory CHI3L1 plays an important role in inflammation-induced lung cancer formation and potentially serve as a biomarker for lung cancer prediction. Based on our previous publication and this work, this is the first animal study linking overexpression of CHI3L1 to various lung tumor mouse models. These models will facilitate identification of additional biomarkers to predict and verify lung cancer under various pathogenic conditions, which normally cannot be done in humans.
authors.affiliation: Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA.
authors.forename: Cong
authors.initials: C
authors.lastname: Yan
authors.forename: Xinchun
authors.initials: X
authors.lastname: Ding
authors.forename: Lingyan
authors.initials: L
authors.lastname: Wu
authors.forename: Menggang
authors.initials: M
authors.lastname: Yu
authors.forename: Peng
authors.initials: P
authors.lastname: Qu
authors.forename: Hong
authors.initials: H
authors.lastname: Du
mesh_terms: D000818:Animals; D014408:Biomarkers, Tumor / Q000097:blood / Q000235:genetics* / Q000378:metabolism; D001992:Bronchoalveolar Lavage Fluid; D045744:Cell Line, Tumor; D000071451:Chitinase-3-Like Protein 1; D004195:Disease Models, Animal; D015972:Gene Expression Regulation, Neoplastic; D006023:Glycoproteins / Q000097:blood / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D007249:Inflammation / Q000150:complications; D008168:Lung / Q000378:metabolism / Q000473:pathology; D008175:Lung Neoplasms / Q000097:blood / Q000209:etiology* / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008822:Mice, Transgenic; D050796:STAT3 Transcription Factor / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; C509289:Chil1 protein, mouse; D000071451:Chitinase-3-Like Protein 1; D006023:Glycoproteins; D050796:STAT3 Transcription Factor