Secreted Phosphoprotein 1 and Sex-Specific Differences in Silica-Induced Pulmonary Fibrosis in Mice
| Autor: | Joseph D. Latoche, Cheryl L. Fattman, Koustav Ganguly, George D. Leikauf, Alexander Chukwuma Ufelle, Fabrizio Fazzi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Male
0301 basic medicine medicine.medical_specialty Pathology Health Toxicology and Mutagenesis Male mice Biology Mice 03 medical and health sciences Sex Factors Internal medicine Pulmonary fibrosis medicine Animals Osteopontin Inhalation exposure Air Pollutants Inhalation Exposure Lung Research Lung fibrosis Public Health Environmental and Occupational Health respiratory system Silicon Dioxide medicine.disease Sex specific respiratory tract diseases Mice Inbred C57BL 030104 developmental biology Endocrinology medicine.anatomical_structure biology.protein Secreted Phosphoprotein 1 Female Bronchoalveolar Lavage Fluid |
| Zdroj: | Environmental Health Perspectives |
| ISSN: | 1552-9924 0091-6765 |
| Popis: | Background: Fibrotic lung diseases occur predominantly in males, and reports describe better survival in affected females. Male mice are more sensitive to silica-induced lung fibrosis than silica-treated female mice. Secreted phosphoprotein 1 (SPP1, also known as osteopontin) increases in pulmonary fibrosis, and Spp1 transcription may be regulated by estrogen or estrogen receptor–related receptors. Objective: We determined whether differences in silica-induced SPP1 levels contribute to sex differences in lung fibrosis. Methods: Male and female mice were treated with 0.2 g/kg intratracheal silica, and lung injury was assessed 1, 3, or 14 days post-exposure. Gene-targeted (Spp1–/–) mice, control Spp1+/+ (C57BL/6J) mice, ovariectomized (OVX) female mice, and estrogen-treated male mice were treated with silica, and lung injury was assessed. Results: Silica-induced SPP1 in lung tissue, bronchoalveolar lavage, and serum increased more in male than in female mice. Following silica treatment, bronchoalveolar lavage cell infiltrates decreased in female Spp1–/– mice compared with female Spp1+/+ mice, and lung hydroxyproline decreased in male Spp1–/– mice compared with male Spp1+/+ mice. OVX female mice had increased lung SPP1 expression in response to silica compared with silica-treated sham female mice. Silica-induced lung collagen and hydroxyproline (markers of fibrosis), and SPP1 levels decreased in estrogen-treated males compared with untreated males. Conclusion: These findings suggest that sex-specific differences in SPP1 levels contribute to the differential sensitivity of male and female mice to the development of silica-induced fibrosis. Citation: Latoche JD, Ufelle AC, Fazzi F, Ganguly K, Leikauf GD, Fattman CL. 2016. Secreted phosphoprotein 1 and sex-specific differences in silica-induced pulmonary fibrosis in mice. Environ Health Perspect 124:1199–1207; http://dx.doi.org/10.1289/ehp.1510335 |
| Databáze: | OpenAIRE |
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