QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

HOME  |   SEARCH  |   ARCHIVE  |   SUBSCRIBE  |   CONTACT  |   HELP

This Article Full Text (PDF) Submit an eLetter Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Horn, J. P. Articles by Stofer, W. D. Search for Related Content PubMed PubMed Citation Articles by Horn, J. P. Articles by Stofer, W. D.

 Previous Article  |  Next Article 

Journal of Neuroscience, Vol 9, 2543-2561, Copyright © 1989 by Society for Neuroscience

ARTICLE

Preganglionic and sensory origins of calcitonin gene-related peptide- like and substance P-like immunoreactivities in bullfrog sympathetic ganglia

JP Horn and WD Stofer
Department of Physiology, University of Pittsburgh School of Medicine, Pennsylvania 15261.

These experiments further define the organization of peptidergic pathways in the paravertebral sympathetic system of the bullfrog. Populations of axons and synaptic boutons in sympathetic ganglia 9 and 10 were found to express calcitonin gene-related peptide-like immunoreactivity (CGRP-IR) and substance P-like immunoreactivity (SP- IR). CGRP-IR is present in fibers that run through the ganglia and in boutons that make contact with almost half of the principal neurons. SP- IR is also present in fibers within the ganglia and in a rare class of synaptic boutons that are found on less than 1% of the principal neurons. Both forms of immunoreactivity are coexpressed in some nerve fibers and in the rare synaptic boutons that contain SP-IR. Neuropeptide Y-like immunoreactivity (NPY-IR), a marker for C-type postganglionic neurons, was used to identify the postsynaptic targets of boutons containing CGRP-IR and SP-IR. Ninety-five percent of the ganglion cells contacted by CGRP-IR boutons were negative for NPY-IR and are therefore likely to be B-type postganglionic neurons. Similarly, 100% of the ganglion cells contacted by boutons containing SP-IR were negative for NPY-IR. Lesions of the sympathetic chain demonstrated that synaptic boutons containing CGRP-IR arise from neurons whose axons enter the chain rostral to ganglion 7. Cutting the chain between ganglia 8 and 9 eliminates all preganglionic B and C inputs to ganglia 9 and 10. The destruction of the preganglionic C pathway by this lesion was verified by staining ganglia 9 and 10 for luteinizing hormone releasing hormone (LHRH). This lesion also eliminated boutons containing CGRP-IR and drastically reduced the number of ganglionic fibers that stained for CGRP-IR and SP-IR. By contrast, cutting the sympathetic chain between ganglia 6 and 7 spared LHRH-IR in the preganglionic C pathway but still eliminated the boutons that normally express CGRP-IR and reduced the amount of staining for SP- IR. CGRP-IR in the sympathetic ganglia arises from preganglionic and sensory neurons whereas ganglionic SP-IR is purely sensory in origin. In the spinal cord, the preganglionic B and C neurons that innervate ganglia 9 and 10 are located in different segments. In segments that contain preganglionic B cells, but not those that contain C cells, there were 243 +/- 37 (mean +/- SD) neurons in the intermediolateral cell column that express CGRP-IR. However, no cell bodies containing SP- IR were found in this region of the spinal cord.(ABSTRACT TRUNCATED AT 400 WORDS)

This article has been cited by other articles:

				C. Li and J. P. Horn Physiological Classification of Sympathetic Neurons in the Rat Superior Cervical Ganglion J Neurophysiol, January 1, 2006; 95(1): 187 - 195. [Abstract] [Full Text] [PDF]

Home  |   Search  |   Archive  |   Subscribe  |   Contact  |   Help