Histaminergic neurons in the central and peripheral nervous system of gastropods (Helix, Lymnaea): an immunocytochemical, biochemical, and electrophysiological approach

The Journal of Comparative Neurology
Endre HegedusK Elekes

Abstract

Distribution, chemical-neuroanatomy, concentration, and uptake-release properties of histamine (HA)-containing neurons and the possible physiological effects of HA in the central and peripheral nervous system of the pulmonate snails, Helix pomatia and Lymnaea stagnalis, are described. In the CNS of both species, the distribution pattern of HA-immunoreactive (HA-IR) neurons was similar. In both species the majority were located in the buccal, cerebral, and pedal ganglia. In Helix, approximately 400 HA-IR neurons were seen, whereas in Lymnaea approximately 130 labeled cells were visualized. The neuropils, connectives, commissures, several peripheral nerves, and a part of the peripheral tissues (lip and foot of both species and the upper tentacles of Helix) were innervated by HA-IR elements. Numerous sensory cells were found in the tentacles, lip, and statocysts. The HA concentration values assayed by HPLC ranged from 4.8 to 47.4 pmol/mg in the different central ganglia of Helix, and from 4.3 to 18.6 pmol/mg in Lymnaea CNS, whereas the peripheral tissues contained 0.33-1 pmol/mg HA in Helix and 0.26-0.46 pmol/mg in Lymnaea. In the Lymnaea CNS, a high-affinity (37.6 microM), single component 3H-HA uptake system was demonstrated. 3H...Continue Reading

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Jun 23, 2009·Journal of Cancer Research and Clinical Oncology·Susanne A KuhnRupert Reichart
Apr 1, 2011·The Journal of Comparative Neurology·Russell C Wyeth, Roger P Croll
Dec 19, 2008·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Nini SkovgaardTobias Wang
Feb 8, 2019·The Journal of Experimental Biology·Russell C Wyeth
Jul 12, 2017·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Nini SkovgaardTobias Wang
Mar 17, 2012·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Sanne EnokNini Skovgaard

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