Roles of Central Opioid Receptor Subtypes in Regulating Itch Sensation

Itch ◽  
2014 ◽  
pp. 443-452
1997 ◽  
Vol 273 (3) ◽  
pp. R956-R959 ◽  
Author(s):  
M. Bertolucci ◽  
C. Perego ◽  
M. G. De Simoni

The central endogenous opioid system is involved in the modulation of interleukin (IL)-6, an inflammatory cytokine that plays a major role in the acute phase response. The present study evaluates whether specific opioid receptor subtypes are selectively involved in this immunomodulatory action. IL-1 beta was administered either intracerebroventricularly or intraperitoneally at the dose of 400 ng to rats pretreated with the mu-antagonist beta-funaltrexamine, the delta-antagonist naltrindole, or the kappa-antagonist nor-binaltorphimine, each at the doses of 1, 10, and 100 micrograms/rat intracerebroventricularly. Serum IL-6 levels were measured 2 h later. The results show that mu-receptor blockade increases, whereas delta-receptor blockade decreases IL-6 induction, suggesting that the fine tuning exerted by opioids on the immune system may be achieved through a balance of opposing effects. Moreover the three antagonists affect IL-6 induction by central and peripheral IL-1 beta with a similar pattern, indicating that the brain endogenous opioid system plays a general role in the regulation of this cytokine.


Appetite ◽  
1991 ◽  
Vol 17 (3) ◽  
pp. 239 ◽  
Author(s):  
Richard J. Bodnar ◽  
Nori Geary

2003 ◽  
Author(s):  
Michael Ossipov ◽  
Josephine Lai ◽  
Todd Vanderah ◽  
Frank Porreca

2009 ◽  
Vol 30 (4) ◽  
pp. 671-678 ◽  
Author(s):  
Peter W. Marinelli ◽  
Douglas Funk ◽  
Stephen Harding ◽  
Zhaoxia Li ◽  
Walter Juzytsch ◽  
...  

1994 ◽  
Vol 264 (2) ◽  
pp. 157-162 ◽  
Author(s):  
Rainer Spanagel ◽  
Osborne F.X. Almeida ◽  
Toni S. Shippenberg

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