Volume 284, Issue 1 pp. 36-47
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Lumbar dorsal root ganglia of the cat: A quantitative study of peptide immunoreactivity and cell size

M. G. Garry

M. G. Garry

Department of Cell Biology and Neuroanatomy, University of Minnesota, Minneapolis, Minnesota 55455

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K. E. Miller

K. E. Miller

Department of Neurological Surgery, University of Miami, School of Medicine, Miami, Florida 33176

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V. S. Seybold

V. S. Seybold

Graduate Program in Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455

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First published: 1 June 1989
Citations: 54

Abstract

The purpose of the present study was to quantify the extent to which several peptides and serotonin coexist with substance P or somatostatin in selected lumbar dorsal root ganglia of the cat. The technique for the simultaneous visualization of two antigens by immunofluorescence was used to investigate the coexistence of neuropeptides in the lumbar dorsal root ganglia of colchicine-treated cats. Perikarya immunoreactive for calcitonin gene-related peptide, galanin, leu-enkephalin, somatostatin, and substance P were visualized in both the lumbar 5 and 6 dorsal root ganglia. In contrast, no immunoreactivity was observed for adipokinetic hormone, bombesin, dynorphin A, met-enkephalin, oxytocin, tyrosine hydroxylase, thyrotropin-releasing hormone, vasopressin, vasoactive intestinal peptide, or serotonin in either ganglion examined. Substance P coexisted with calcitonin-gene-related peptide, somatostatin, and leu-enkephalin. Somatostatin was colocalized with calcitonin gene-related peptide, leu-enkephalin, and substance P but coexisted with galanin minimally. The cell area of immunoreactive perikarya was also examined. Data concerning the cross-sectional area of immunoreactive cells indicated that somatostatin-immunoreactive perikarya were generally the largest population observed (up to ∼6,000 μm2). Somatostatin and calcitonin gene-related peptide, as well as substance P and calcitonin gene-related peptide, coexisted in populations of cell bodies that had a smaller size (less than 2,000 μm2). These results suggest that certain peptides which coexist in the dorsal root ganglia may provide histochemical markers for functional groups of primary afferent neurons.

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