Novel compound LL-a produces long and nociceptive-selective regional anesthesia via TRPV1 channels in rodents sciatic nerve block model.

Abstract:

BACKGROUND AND OBJECTIVE:Long-acting nociceptive-selective regional anesthesia has remained an elusive clinical goal. We aspired to identify a novel compound that would produce nociceptive-selective regional anesthesia through the transient receptor potential vanilloid 1 (TRPV1) channels. METHODS:We designed and synthesized a novel compound (LL-a) that penetrates the cell membrane through TRPV1 channels and binds to voltage-gated sodium channels. The regional anesthetic effect of LL-a was evaluated in a rodent sciatic nerve block model. Electrophysiological recording was applied to test the inhibition of LL-a on voltage-gated sodium channel currents. RESULTS:LL-a inhibited sodium channel currents on the dorsal root ganglion neurons of mice and this action was diminished by TRPV1 channel knockout. In a sciatic nerve block model of a rat, 0.2% and 0.4% (w/v) LL-a produced selective sensory block with median (IQR) durations of 42.0 (24.0, 48.0) and 72.0 (69.0, 78.0) hours, respectively. No motor block was found for 0.2% LL-a. 0.4% LL-a produced a motor block with a median (IQR) duration of 3.0 (0.0, 6.0) hours. This selective sensory block was not observed on TRPV1 knockout mice. As a positive control, 0.5% and 0.75% levobupivacaine produced a non-selective sciatic nerve block with median (IQR) durations of 2.8 (2.6, 2.8) and 3.8 (3.8, 4.8) hours, respectively. No systemic or local irritation was observed during injection of LL-a and sensory and motor function completely recovered for all the animals. CONCLUSIONS:LL-a is a potential novel local anesthetic for long-lasting nociceptive-selective analgesia.

journal_name

Reg Anesth Pain Med

authors

Zhou C,Tang L,Yin Q,Yang L,Gong D,Kang Y,Cao H,Fan J,Zhang Y,Qian D,Zhang Q,Ke B,Liu J,Zhang W,Yang J

doi

10.1136/rapm-2019-101057

subject

Has Abstract

pub_date

2020-06-01 00:00:00

pages

412-418

issue

6

eissn

1098-7339

issn

1532-8651

pii

rapm-2019-101057

journal_volume

45

pub_type

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