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[Morphine-3-glucuronide (M3G) potentiates noxious stimulus-evoked Fos protein-like immunoreactivity in the rat spinal
Abstract:
The effect of morphine-3-glucuronide (M3G) on noxious stimulus-evoked Fos protein-like immunoreactivity in the rat spinal cord were assessed by ABC method. It was found that a dose-dependent increase of Fos-like immunoreactive neurons could be induced by M3G intrathecal injection followed by formaline injection into hindpaw. With high dosage M3G (1.1 x 10(-7) mole), dense Fos-like labelling was found in the superficial and the deep dorsal horn bilaterally, While with low dosage M3G (5.4 x 10(-8) and 1.1 x 10(-8) mole), most of the positively labelled neurons were only found in laminae I and II of the ipsilateral dorsal horn to the injured paw. The above results revealed that M3G exerts a potentiating effect on the noxious stimulus-evoked Fos protein-like immunoreactivity in the rat spinal cord.
Insights
Morphine-3-glucuronide (M3G) amplifies pain signals in the rat spinal cord. This study shows M3G increases Fos protein expression, a marker of nerve activity, in response to painful stimuli.
Area of Science:
- Neuroscience
- Pharmacology
- Pain research