<b>A role for scavenger receptor B1 as a captor of specific fatty acids in taste buds of circumvallate </b><b>papillae </b>
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- TSUZUKI Satoshi
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University
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- LEE Shinhye
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University
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- KIMOTO Yusaku
- Department of Food Science and Biotechnology, Faculty of Agriculture, Kyoto University
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- SUGAWARA Tatsuya
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University
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- MANABE Yuki
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University
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- INOUE Kazuo
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University
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Abstract
<p>Class B scavenger receptor family members, scavenger receptor B1 (SR-B1) and cluster of differentiation 36 (CD36), are broadly expressed cell-surface proteins, both of which are believed to serve as multifaceted players in lipid and lipoprotein metabolism in mammals. Because of its presence in the apical part of taste receptor cells within circumvallate taste buds and its ability to recognise long-chain fatty acids, CD36 has been believed to participate in the sensing of the lipid species within the oral cavity. However, there have been no attempts to address whether SR-B1 has such a role to date. In this study, by reverse transcription- polymerase chain reaction analysis, we detected SR-B1 mRNA in a total RNA sample isolated from the circumvallate papillae of mouse tongue. Immunohistochemical analysis of tongue sections from the animals revealed the expression of SR-B1 protein in a population of taste bud cells of circumvallate papillae. In addition, the pattern of staining in the papillae for SR-B1 agreed closely with that for CD36 in double immunostaining analysis. We performed a cell-free in-vitro assay utilising a peptide mimic of SR-B1 and provided evidence that the receptor could recognise certain of the unsaturated long-chain fatty acids such as oleic acid. Our present findings suggest an additional role for SR-B1 as a captor of specific fatty acids in the oral cavity of mammals and contribute to expanding our knowledge of the physiological function of the receptor.</p>
Journal
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- Biomedical Research
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Biomedical Research 39 (6), 295-300, 2018-12-01
Biomedical Research Press