Jci_page_head_homepage_01 Jci_page_head_homepage_02
Andreas Leffler, Michael J. Fischer, Dietlinde Rehner, Stephanie Kienel, Katrin Kistner, Susanne K. Sauer, Narender R. Gavva, Peter W. Reeh, Carla Nau
Published in Volume 118, Issue 2
J Clin Invest. 2008; 118(2):763–776 doi:10.1172/JCI32751
Abstract | Full text | PDF | Supplemental material
Options: View larger image (or click on image)
Medium
Figure 4
Activation, but not sensitization, of TRPV1 by lidocaine depends on the vanilloid-binding domain.

(A and B) Representative currents of rTRPV1 and oTRPV1 activated by 30 mM lidocaine and 10 μM capsaicin (A) or 30 mM lidocaine and protons (pH 5.0; B). Each cell was treated with lidocaine followed by either capsaicin or protons. Cells were held at –60 mV, and test solutions were applied every 2 min. (C) Mean ratios of lidocaine- (30 mM) to capsaicin-activated (10 μM) currents of rTRPV1-WT, rTRPV1-Y511A, oTRPV1-WT, oTRPV1-550T, and r/oTRPV1 chimera. (D) Mean ratios of lidocaine- (30 mM) to proton-activated (pH 5.0) currents of rTRPV1 and oTRPV1 constructs. In C and D, statistical comparisons were calculated with unpaired Student’s t test; n = 5–8 cells of each construct. (E and F) Effect of 3 mM lidocaine on capsaicin-evoked (E) and heat-evoked oTRPV1 currents (F). Experiments were performed as described for Figure 2. **P < 0.01; ***P < 0.001.