Opening a “Wide” Window onto Taste Signal Transmission

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Opening a “Wide” Window onto Taste Signal Transmission Yuki Oka Neuron Volume 98, Issue 3, Pages 456-458 (May 2018) DOI: 10.1016/j.neuron.2018.04.020 Copyright © 2018 Elsevier Inc. Terms and Conditions

Figure 1 Purinergic Neurotransmission of Taste Bud Cells Schematic diagram illustrating that taste bud cells (TBCs) are innervated by afferent nerve fibers from secondary taste neurons (top). Individual TBCs are tuned to mediate one of five basic tastes. Based on morphological characteristics, support cells are sometimes termed type I; sweet, umami, and bitter cells are type II; and sour cells are type III TBCs. Once TBCs receive taste stimulation, they generate action potentials leading to ATP release, which in turn activates P2X2 and P2X3 receptors expressed by afferent nerve fibers. Sour-sensing TBCs use conventional synaptic vesicles to secrete ATP (bottom left), whereas sweet, umami, and bitter TBCs release ATP via CALHM1/CALHM3 channels (bottom right). Neuron 2018 98, 456-458DOI: (10.1016/j.neuron.2018.04.020) Copyright © 2018 Elsevier Inc. Terms and Conditions