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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Distribution of neurons expressing calcitonin gene-related peptide mRNAs in the brain stem, spinal cord and dorsal root ganglia of rat and guinea-pig.

In situ hybridization histochemistry was used to localize calcitonin gene-related peptide mRNAs in spinal cord, brain stem and dorsal root ganglion neurons of the rat and guinea-pig. A 32P-labeled 23-base-long (23mer) oligodeoxyribonucleotide (oligomer) complementary to calcitonin gene-related peptide mRNA sequences encoding residues 23-30 of calcitonin gene-related peptide was used primarily as a probe (CGRP I probe). A 32mer complementary to mRNA sequences for residues 10-20 of calcitonin gene-related peptide (CGRP II probe) was also used as a positive control for specificity of the 23mer for calcitonin gene-related peptide mRNA. In both the guinea-pig and rat calcitonin gene-related peptide mRNA was localized specifically to neurons of the dorsal root ganglion, to spinal motoneurons and to motoneurons of the hypoglossal, facial and accessory facial motor nuclei. Differences in the distribution of calcitonin gene-related peptide mRNA between the rat and guinea-pig included a higher proportion of rat dorsal root ganglion neurons containing calcitonin gene-related peptide mRNA and the localization of calcitonin gene-related peptide mRNA to motoneurons of the ambiguus motor nucleus, parabrachial and peripeduncular nucleus of the rat but not the guinea-pig. In the guinea-pig, in contrast, calcitonin gene-related peptide mRNA was localized also to motoneurons of the abducens, trigeminal, trochlear and oculomotor nerves. The neuronal groups in the intact rat found here to contain calcitonin gene-related mRNA have also been shown previously to contain calcitonin gene-related peptide immunoreactivity in colchicine-treated rats. Colchicine-treated rats, however, have been found to contain additional groups of calcitonin gene-related peptide immunoreactive neurons which, in the intact rats used in the present study, showed no detectable hybridization with the calcitonin gene-related peptide probe.[1]


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