Abstract
Tannins are characterized by protein-binding affinity. They have astringent/bitter properties that act as deterrents, affecting diet selection. Two groups of salivary proteins, proline-rich proteins and histatins, are effective precipitators of tannin, decreasing levels of available tannins. The possibility of other salivary proteins having a co-adjuvant role on host defense mechanisms against tannins is unknown. In this work, we characterized and compared the protein profile of mice whole saliva from animals fed on three experimental diets: tannin-free diet, diet with the incorporation of 5% hydrolyzable tannins (tannic acid), or diet with 5% condensed tannins (quebracho). Protein analysis was performed by one-dimensional gel electrophoresis combined with Matrix-Assisted Laser Desorption Ionization-Time of Flight mass spectrometry to allow the dynamic study of interactions between diet and saliva. Since abundant salivary proteins obscure the purification and identification of medium and low expressed salivary proteins, we used centrifugation to obtain saliva samples free from proteins that precipitate after tannin binding. Data from Peptide Mass Fingerprinting allowed us to identify ten different proteins, some of them showing more than one isoform. Tannin-enriched diets were observed to change the salivary protein profile. One isoform of α-amylase was overexpressed with both types of tannins. Aldehyde reductase was only identified in saliva of the quebracho group. Additionally, a hypertrophy of parotid salivary gland acini was observed by histology, along with a decrease in body mass in the first 4 days of the experimental period.
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Acknowledgments
We acknowledge the generous offer of Tupafin Ato from the Silva Chimica Company (Italy) to Dr André M. Almeida to review this manuscript and Prof. Alfredo Pereira for support with the statistical analysis. This work was supported by POCTI FCT-CVT/33039/99-00 scientific project. Gonçalo da Costa and Elsa Lamy acknowledge a PhD grant from 3° Quadro Comunitário de Apoio of FCT—Fundação para a Ciência e a Tecnologia of the Ministério da Ciência Tecnologia e Ensino Superior.
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G. da Costa and E. Lamy have contributed equally to this work.
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da Costa, G., Lamy, E., Capela e Silva, F. et al. Salivary Amylase Induction by Tannin-Enriched Diets as a Possible Countermeasure Against Tannins. J Chem Ecol 34, 376–387 (2008). https://doi.org/10.1007/s10886-007-9413-z
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DOI: https://doi.org/10.1007/s10886-007-9413-z