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2018 ; 15
(4
): 4014-4018
Nephropedia Template TP
He X
; Huang L
; Qiu S
; Yin X
; Shen Y
; Wu Y
; Jiang Y
; Fang J
Exp Ther Med
2018[Apr]; 15
(4
): 4014-4018
PMID29581750
show ga
The classical analgesic pathway of opioids by binding their receptors in the
nervous system is well known. However, little is known regarding opioid analgesia
through the anti-inflammatory pathway. The present study aimed to investigate the
analgesic and anti-inflammatory effect of ?-endorphin on inflammatory pain. A rat
model of collagen-induced arthritis (CIA) was generated by intradermal injection
of bovine type II collagen. Rats were divided into the CIA + saline group and the
CIA + ?-endorphin group, in which rats were intraperitoneally injected with
?-endorphin once every other day from day 18 following the injection of CII until
day 28. Thermal hyperalgesia as determined by tail flick latency (TFL), as well
as paw arthritis index and swelling. Tumor necrosis factor (TNF)-?, interleukin
(IL)-1? and IL-6 mRNA expression in synovial tissue and their protein levels in
paw inflammatory tissue were measured. The rat CIA model was successfully induced
as indicated by the significantly decreased TFL, increased paw arthritis index
and percentage of swelling on day 18. ?-endorphin treatment significantly
increased the TFL, while decreasing the paw arthritis index and swelling in CIA
rats. It also significantly downregulated TNF-? and IL-1? mRNA expression in
synovial tissue and their protein levels in inflammatory tissue of the paws of
CIA rats, while it had no significant effect on the levels of IL-6. These results
indicated that ?-endorphin suppresses peripheral pro-inflammatory mediators in
collagen-induced arthritis, which may contribute to its analgesic effect.