Chem. Senses 26: 915-923,
2001
© Oxford University Press 2001
Whole Nerve Chorda Tympani Responses to Sweeteners in C57BL/6ByJ and 129P3/J Mice
1 Tokyo University of Pharmacy and Life Science, Tokyo 192-03, Japan and 2 Monell Chemical Senses Center, Philadelphia, PA 19104, USA
Correspondence to be sent to: Stuart A. McCaughey, Monell Chemical Senses Center, 3500 Market Street, Philadelphia, PA 19104, USA. e-mail: mccaughey{at}monell.org
The C57BL/6ByJ (B6) strain of mice exhibits higher preferences than does the 129P3/J (129) strain for a variety of sweet tasting compounds. We measured gustatory afferent responses of the whole chorda tympani nerve in these two strains using a broad array of sweeteners and other taste stimuli. Neural responses were greater in B6 than in 129 mice to the sugars sucrose and maltose, the polyol D-sorbitol and the non-caloric sweeteners Na saccharin, acesulfame-K, SC-45647 and sucralose. Lower neural response thresholds were also observed in the B6 strain for most of these stimuli. The strains did not differ in their neural responses to amino acids that are thought to taste sweet to mice, with the exception of L-proline, which evoked larger responses in the B6 strain. Aspartame and thaumatin, which taste sweet to humans but are not strongly preferred by B6 or 129 mice, did not evoke neural responses that exceeded threshold in either strain. The strains generally did not differ in their neural responses to NaCl, quinine and HCl. Thus, variation between the B6 and 129 strains in the peripheral gustatory system may contribute to differences in their consumption of many sweeteners.
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