Is there more than one prostaglandin E receptor subtype mediating hyperalgesia in the rat hindpaw?

Neuroscience. 1995 Feb;64(4):1161-5. doi: 10.1016/0306-4522(94)00423-3.

Abstract

Five synthetic prostaglandin E analogs (11-deoxyPGE1, 17-phenyl-ol-trinor prostaglandin E2, enisoprost, MB28767 and misoprostol) have been evaluated for their ability to produce mechanical hyperalgesia in rats. The Randall-Selitto paw withdrawal model of mechanical hyperalgesia was used. Following intradermal injections (2.5 microliters) into the dorsal surface of the hindpaw, each prostaglandin E analog produced a dose-dependent (1-1000 ng) decrease in nociceptive threshold (i.e. hyperalgesia). Hyperalgesia produced by 17-phenyl-ol-trinor prostaglandin E2 and MB28767, was inhibited by the prostaglandin E1 antagonist SC19220 (7.5 ng), while the hyperalgesia produced by 11-deoxyprostaglandin E1, enisoprost and misoprostol was not inhibited by this antagonist. Hyperalgesia produced by all five analogs was significantly attenuated or completely blocked by inhibiting stimulatory guanine nucleotide-binding regulatory protein with guanosine 5'-O-(2-thiodiphosphate), adenylyl cyclase with 2'5'-dideoxyadenosine and protein kinase A with WIPTIDE. These results suggest the presence of more than one prostaglandin E-receptor subtype, which mediate hyperalgesia, predominantly via the cAMP second messenger system, in the hindpaw of the rat.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Alprostadil / pharmacology
  • Animals
  • Dibenz(b,f)(1,4)oxazepine-10(11H)-carboxylic acid, 8-chloro-, 2-acetylhydrazide / pharmacology
  • Dinoprostone / pharmacology
  • Dose-Response Relationship, Drug
  • Hindlimb*
  • Hyperalgesia*
  • Male
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, Prostaglandin E / classification*
  • Receptors, Prostaglandin E / physiology

Substances

  • Receptors, Prostaglandin E
  • Dibenz(b,f)(1,4)oxazepine-10(11H)-carboxylic acid, 8-chloro-, 2-acetylhydrazide
  • Alprostadil
  • Dinoprostone