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The double knockout of Bach1 and Bach2 in mice reveals shared compensatory mechanisms in regulating alveolar macrophage function and lung surfactant homeostasis.
Journal of Biochemistry 2016 December
Pulmonary alveolar proteinosis (PAP) is a disease resulting from a dysfunction of the alveolar macrophages (AMs) where excess surfactant protein accumulates in the alveolar spaces. We previously reported that Bach2 KO mice developed PAP due to a defect in the handling of lipids by AMs. To investigate the functions of Bach1 and Bach2, which are regulated by oxidative stress, in the AMs and in lung homeostasis, we generated mice that lacked both Bach1 and Bach2 (Bach1/2 DKO mice). The Bach1/2 DKO mice showed more severe PAP phenotype than Bach2 KO mice with abnormal AMs, whereas the Bach1 KO mice did not develop any pulmonary disease. The PAP-like disease in the Bach1/2 DKO and Bach2 KO mice was not ameliorated by antioxidant, suggesting that ROS was not involved in the onset of PAP in the absence of Bach1 and Bach2. A microarray and a chromatin immunoprecipitation sequence analysis revealed that Bach1 and Bach2 directly repress the common set of genes involved in the inflammatory response, and that Bach2 is a major contributor to this repression. These results suggest that Bach1 and Bach2 work in a complementary manner to maintain the normal function of the AMs and surfactant homeostasis in the lung.
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