Distribution of galanin-immunoreactive nerve fibers in the carotid labyrinth of the bullfrog,Rana catesbeiana: comparison with substance P-immunoreactive fibers |
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| Authors: | Tatsumi Kusakabe Tadashi Kawakami Michio Ono Hideaki Hori Hajime Sawada Toshifumi Takenaka |
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| Institution: | (1) Department of Anatomy, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, 236 Yokohama, Japan;(2) Department of Physiology, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, 236 Yokohama, Japan |
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| Abstract: | Immunoreactivity of galanin (GAL) was detected in the nerve fibers distributed within the intervascular stroma of the bullfrog carotid labyrinth. GAL-immunoreactive fibers are numerous, and some are close to the sinusoidal plexus. Most GAL fibers appear as thin processes with some varicosities. A combination of indirect double immunofluorescence labelling and image processing clearly demonstrated that the distribution patern of GAL fibers is different from that of SP fibers. This indicates that GAL and SP do not coexist in the same nerve fibers. The role of GAL fibers may be different from that of previously reported neuropeptides (substance P, calcitonin gene-related peptide, vasoactive intestinal polypeptide, neuropeptide Y, and others) as a neuromodulator in controlling vascular tone of the labyrinth. |
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| Keywords: | Carotid labyrinth Galanin Substance P Double immunofluorescence labelling Image processing Rana catesbeiana (Anura) |
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