“Long-term (4 h) treatment … agonists (glutamate, quisqualate or DHPG ) increased the … responding to capsaicin through activation of metabotropic glutamate receptor mGluR1, and only partially through the activation of mGluR5; engagement of … was evident in neurons responding to allylisothiocyanate (AITC), a transient receptor potential ankyrin type 1 (TRPA1) agonist.”