An oral TRPV 1 antagonist attenuates laser radiant‐heat‐evoked potentials and pain ratings from UV B ‐inflamed and normal skin
Aims Laser (radiant‐heat) evoked potentials ( LEP s) from vertex‐ EEG p eak‐to‐ p eak ( PtP ) amplitude were used to determine acute antinociceptive/antihyperalgesic efficacy of ABT ‐102, a novel TRPV 1 antagonist efficacious in preclinical pain models, compared with active controls and placebo in n...
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Published in | British journal of clinical pharmacology Vol. 75; no. 2; pp. 404 - 414 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.02.2013
|
Online Access | Get full text |
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Summary: | Aims
Laser (radiant‐heat) evoked potentials (
LEP
s) from vertex‐
EEG p
eak‐to‐
p
eak (
PtP
) amplitude were used to determine acute antinociceptive/antihyperalgesic efficacy of
ABT
‐102, a novel
TRPV
1 antagonist efficacious in preclinical pain models, compared with active controls and placebo in normal and
UV
B
‐inflamed skin.
Methods
This was a randomized, placebo‐ and active‐controlled, double‐blind, intra‐individual, crossover trial. Twenty‐four healthy subjects received six sequences of single doses of
ABT
‐102 (0.5, 2, 6 mg), etoricoxib 90 mg, tramadol 100 mg and placebo. Painful stimuli were induced by
CO
2
‐laser on normal and
UV
B
‐inflamed skin.
LEPs
and visual analogue scale (
VAS
‐pain) ratings were taken at baseline and hourly up to 8 h post‐dose from both skin types.
Results
Compared with placebo, significant mean decreases in the primary variable of
LEP PtP
‐amplitude from
UV
B
‐inflamed skin were observed with
ABT
‐102 6 mg (
P
< 0.001),
ABT
‐102 2 mg (
P
= 0.002), tramadol 100 mg (
P
< 0.001), and etoricoxib 90 mg (
P
= 0.001) over the 8 h period;
ABT
‐102 0.5 mg was similar to placebo.
ABT
‐102 6 mg was superior to active controls over the 8 h period (
P
< 0.05) whereas
ABT
‐102 2 mg was comparable. Improvements in
VAS
scores compared with placebo were observed with
ABT
‐102 6 mg (
P
< 0.001) and
ABT
‐102 2 mg (
P
= 0.002).
ABT
‐102 average plasma concentrations were 1.3, 4.4 and 9.4 ng ml
−1
for the 0.5, 2 and 6 mg doses, respectively. There were no clinically significant safety findings.
Conclusions
TRPV
‐1 antagonism appears promising in the management of clinical pain, but requires further investigation. |
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ISSN: | 0306-5251 1365-2125 |
DOI: | 10.1111/j.1365-2125.2012.04377.x |