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Chemical Senses 5: 81-91,
© 1980

research-article

Effects of protease, phospholipase and neuraminidase on the Ca2+- receptor of the frog tongue

Naokazu Asanuma and Hiromichi Nomura

Department of Oral Physiology, Matsumoto Dental College Shiojiri, 399–07, Japan

Effects of some proteases, phospholipases and a neuraminidase on the Ca2+-receptor of the frog tongue were studied by recording neural responses from single fungiform papilla preparations before and after application of the enzymes. The results obtained were as follows: 1) Trypsin, {alpha}-chymotrypsin, pronase and high concentrations of phospholipase-C inhibited the Ca2+-response of the receptor irreversibly. 2) Ficin, phospholipase-D and low concentrations of phospholipase-C inhibited the Ca2+-response temporarily, and the response recovered 10 to 20 min after removal of theenzymes. A similar temporal inhibition was produced by neuraminidase, but the recovery was more gradual than in the cases of ficin and phospholipases. 3) Phospholipase-A hardly produced any significant effects on the Ca2+-response. Based on these results, the characteristics of the Ca2+- receptor of the frog tongue were considered.


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