Enkephalin-immunoreactive nociceptive neurons in the cat spinal cord.

Publication Type:

Journal Article

Authors:

Ribeiro-da-Silva, A; Yves De Koninck; Cuello, A C; Henry, J L

Source:

Neuroreport, Volume 3, Issue 1, p.25-8 (1992)

Keywords:

Animals, Antibodies, Monoclonal, Autoradiography, Cats, Dendrites, Electric Stimulation, Enkephalins, Horseradish Peroxidase, Male, Neurons, Nociceptors, Physical Stimulation, Spinal Cord, Substance P

Abstract:

<p>In this combined electrophysiological-ultrastructural study in the cat spinal cord, we detected enkephalin-like immunoreactivity using internally radio-labelled monoclonal antibodies in functionally characterized neurons which had been filled intracellularly with horseradish peroxidase. Of the 4 neurons included in this study, two were positive for enkephalin immunoreactivity; one was a nociceptive specific neuron in lamina I, the other a wide dynamic range neuron in lamina V. The other two cells were devoid of immunoreactivity for enkephalin; one was a wide dynamic range neuron and the other was a non-nociceptive neuron. These results thus provide a morphological substrate within the spinal dorsal horn for the release of an endogenous opioid following administration of substance P or noxious cutaneous stimulation.</p>