Differential localisation of BPIFA1 (SPLUNC1) and BPIFB1 (LPLUNC1) in the nasal and oral cavities of mice |
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Authors: | Maslinda Musa Kirsty Wilson Le Sun Apoorva Mulay Lynne Bingle Helen M Marriott Elizabeth E LeClair Colin D Bingle |
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Institution: | 1. Academic Unit of Respiratory Medicine, Department of Infection and Immunity, University of Sheffield, Sheffield, S10 2JF, UK 2. Department of Biomolecular Sciences, Faculty of Applied Sciences, University Technology MARA, Shah Alam, Selangor, Malaysia 3. Oral and Maxillofacial Pathology, Department of Clinical Dentistry, University of Sheffield, Sheffield, UK 4. Department of Biological Sciences, DePaul University, Chicago, IL, USA
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Abstract: | Despite being initially identified in mice, little is known about the sites of production of members of the BPI fold (BPIF) containing (PLUNC) family of putative innate defence proteins in this species. These proteins have largely been considered to be specificaly expressed in the respiratory tract, and we have recently shown that they exhibit differential expression in the epithelium of the proximal airways. In this study, we have used species-specific antibodies to systematically localize two members of this protein family; BPIFA1 (PLUNC/SPLUNC1) and BPIFB1 (LPLUNC1) in adult mice. In general, these proteins exhibit distinct and only partially overlapping localization. BPIFA1 is highly expressed in the respiratory epithelium and Bowman??s glands of the nasal passages, whereas BPIFB1 is present in small subset of goblet cells in the nasal passage and pharynx. BPIFB1 is also present in the serous glands in the proximal tongue where is co-localised with the salivary gland specific family member, BPIFA2E (parotid secretory protein) and also in glands of the soft palate. Both proteins exhibit limited expression outside of these regions. These results are consistent with the localization of the proteins seen in man. Knowledge of the complex expression patterns of BPIF proteins in these regions will allow the use of tractable mouse models of disease to dissect their function. |
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