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- W2121897287 abstract "Abstract NADPH oxidase plays a role in homeostatic regulation of innate immunity beyond conventional microbicidial functions. MES is a rat strain that spontaneously develops severe blood eosinophilia as a hereditary trait. Herein, we report that eosinophilia in MES rats is caused by a loss–of–function mutation in the gene for cytochrome b(–245), α polypeptide (Cyba; also known as p22phox), which is an essential component of the superoxide–generating NADPH oxidase complex. The MES rat has a deletion of four nucleotides, including the 5′ splice donor GpT of intron 4 of the Cyba gene. As a consequence of the deletion, a 51–nucleotide sequence of intron 4 is incorporated into the Cyba transcripts. Leukocytes from the MES strain lack both CYBA protein and NADPH oxidase activity. Nevertheless, unlike patients with chronic granulomatous disease, who suffer from infections with pathogens due to similar genetic defects in NADPH oxidase, MES rats retain normal innate immune defense against Staphylococcus aureus infection. This is due to large quantities of peritoneal eosinophils in MES rats, which phagocytose and kill the bacteria. MES rat has a balance defect due to impaired formation of otoconia in the utricles and saccules. Eosinophilia of the MES rat was normalized by introduction of a normal Cyba transgene. The mechanisms by which impairment of NADPH oxidase leads to eosinophilia in the MES rat are elusive. However, our study highlights the essential role of NADPH oxidase in homeostatic regulation of innate immunity beyond conventional microbicidial functions." @default.
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- W2121897287 date "2009-04-30" @default.
- W2121897287 modified "2023-10-16" @default.
- W2121897287 title "Pivotal Advance: Eosinophilia in the MES rat strain is caused by a loss–of–function mutation in the gene for cytochrome <i>b</i>(–245), alpha polypeptide (<i>Cyba</i>)" @default.
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- W2121897287 doi "https://doi.org/10.1189/jlb.1108715" @default.
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