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Bombesin/gastrin-releasing peptide (GRP)- and Met5-enkephalin-Arg6-Gly7- Leu8-like immunoreactivities in small intensely fluorescent (SIF) cells and nerve fibers of rat sympathetic ganglia

P Helen, P Panula, HY Yang and SI Rapoport

Superior cervical and hypogastric ganglia were removed from rats that had been perfused with a mixture of 4% paraformaldehyde and 0.25% glutaraldehyde. Specific antisera against Met5-enkephalin-Arg6-Gly7- Leu8 (MEAGL) and bombesin/gastrin-releasing peptide (BN/GRP) were used in the immunofluorescence procedure. In hypogastric ganglia, a subpopulation of small intensely fluorescent (SIF) cells, as identified by their aqueous aldehyde (Faglu)-induced fluorescence, showed MEAGL- and BN/GRP-like immunolabeling. SIF cells in the superior cervical ganglia were unlabeled. In both ganglia, varicose nerve fiber networks and nerve terminals surrounding principal ganglion cells showed MEAGL- and BN/GRP-like immunoreactivities. Unlabeled SIF cells often were in close contact with nerve fibers that had MEAGL-like immunolabeling. Immunoreactivities against MEAGL- and BN/GRP-like neuropeptides in nerve fibers and terminals suggest a neurotransmitter or neuromodulator role for these peptides. In addition, labeling in SIF cells implies their possible endocrine function.

Volume 32, Issue 11, pp. 1131-1138, 11/01/1984
Copyright © 1984 by The Histochemical Society


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