Participation of KATP Channels in the Antinociceptive Effect of Pregabalin in Rat Formalin Test.
10.3344/kjp.2011.24.3.131
- Author:
Tae Dong KWEON
;
Ji Young KIM
;
Il Won KWON
;
Jong Bum CHOI
;
Youn Woo LEE
- Publication Type:Original Article
- Keywords:
antinociception;
formalin test;
KATP channel;
pregabalin
- MeSH:
Anesthesia, Inhalation;
Animals;
Catheters;
Dimethyl Sulfoxide;
Enflurane;
Formaldehyde;
gamma-Aminobutyric Acid;
Glyburide;
Horns;
Humans;
Immunohistochemistry;
KATP Channels;
Male;
Pain Measurement;
Prostaglandins B;
Rats;
Rats, Sprague-Dawley;
Spinal Cord;
Thienamycins;
Pregabalin
- From:The Korean Journal of Pain
2011;24(3):131-136
- CountryRepublic of Korea
- Language:English
-
Abstract:
BACKGROUND: Pregabalin is an anticonvulsant and analgesic agent that interacts selectively with the voltage-sensitive-Ca(2+)-channel alpha-2-delta subunit. The aim of this study was to evaluate whether the analgesic action of intrathecal (IT) pregabalin is associated with KATP channels in the rat formalin test. METHODS: IT PE-10 catheters were implanted in male Sprague-Dawley rats (250-300 g) under inhalation anesthesia using enflurane. Nociceptive behavior was defined as the number of hind paw flinches during 60 min after formalin injection. Ten min before formalin injection, IT drug treatments were divided into 3 groups: normal saline (NS) 20 microl (CON group); pregabalin 0.3, 1, 3 and 10 microg in NS 10 microl (PGB group); glibenclamide 100 microg in DMSO 5 microl with pregabalin 0.3, 1, 3 and 10 microg in NS 5 microl (GBC group). All the drugs were flushed with NS 10 microl. Immunohistochemistry for the KATP channel was done with a different set of rats divided into naive, NS and PGB groups. RESULTS: IT pregabalin dose-dependently decreased the flinching number only in phase 2 of formalin test. The log dose response curve of the GBC group shifted to the right with respect to that of the PGB group. Immunohistochemistry for the KATP channel expression on the spinal cord dorsal horn showed no difference among the groups 1 hr after the formalin test. CONCLUSIONS: The antinociceptive effect of pregabalin in the rat formalin test was associated with the activation of the KATP channel. However, pregabalin did not induce KATP channel expression in the spinal cord dorsal horn.
