Hasan Polat, Gianfranco Grande, Zeenat Aurangzeb, Huiming Zhang, Gheylen Daghfous, Réjean Dubuc, Barbara Zielinski
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The distribution and chemosensory responses of pharyngeal taste buds in the sea lamprey Petromyzon marinus.
Little is known about the chemosensory system of gustation in sea lampreys, basal jawless vertebrates that feed voraciously on live prey. The objective of this study was to investigate taste bud distribution and chemosensory responses along the length of the pharynx in the sea lamprey. Scanning electron microscopy and immunocytochemistry revealed taste buds and associated axons at all six lateral pharyngeal locations between the seven pairs of internal gill pores. The most rostral pharyngeal region contained more and larger taste buds than the most caudal region. Taste receptor cell responses were recorded to sweet, bitter, amino acids and the bile acid taurocholic acid, as well as to adenosine triphosphate. Similar chemosensory responses were observed at all six pharyngeal locations with taste buds. Overall, this study shows prominent taste buds and taste receptor cell activity in the seven pharyngeal regions of the sea lamprey.
期刊介绍：
The Journal of Comparative Physiology A welcomes original articles, short reviews, and short communications in the following fields:
- Neurobiology and neuroethology
- Sensory physiology and ecology
- Physiological and hormonal basis of behavior
- Communication, orientation, and locomotion
- Functional imaging and neuroanatomy
Contributions should add to our understanding of mechanisms and not be purely descriptive. The level of organization addressed may be organismic, cellular, or molecular.
Colour figures are free in print and online.
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