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  • Title: Percentages of dorsal root axons immunoreactive for galanin are higher than those immunoreactive for calcitonin gene-related peptide in the rat.
    Author: Klein CM, Westlund KN, Coggeshall RE.
    Journal: Brain Res; 1990 Jun 11; 519(1-2):97-101. PubMed ID: 1697779.
    Abstract:
    The present study shows that 28% of the myelinated and 27% of the unmyelinated axons in the L5 and S1 rat dorsal roots are immunolabeled for galanin. By contrast only 10% of the myelinated and 15% of the unmyelinated axons are immunolabeled for calcitonin gene-related peptide, which is the numerically predominant primary afferent peptide marker for dorsal root ganglion cells. Thus galanin, because of its presence in so many primary afferent fibers, emerges as an important primary afferent marker. In addition, since our data also show that galanin is present predominantly in unmyelinated and fine myelinated sensory axons, a hypothesis is that it is particularly concerned with the transmission of noxious information.
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