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Colocalisation of taurine‐ with transmitter‐immunoreactivities in the nervous system of the migratory locust
Author(s) -
Stevenson Paul A.
Publication year - 1999
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/(sici)1096-9861(19990201)404:1<86::aid-cne7>3.0.co;2-8
Subject(s) - biology , efferent , migratory locust , thoracic ganglia , locust , neuroscience , gabaergic , inhibitory postsynaptic potential , nervous system , interneuron , neuropeptide , octopamine (neurotransmitter) , fmrfamide , central nervous system , anatomy , medicine , biochemistry , serotonin , receptor , afferent , botany
The expression of taurine immunoreactivity (TAU‐IR) by neurones immunoreactive for octopamine (OA‐IR), γ‐aminobutyric acid (GABA‐IR), and the C‐terminal peptide sequence arginine‐phenylalanine (RFamide‐IR) was investigated in the migratory locust ( Locusta migratoria ). TAU‐IR is colocalised with OA‐IR in the dorsal unpaired median neurones, which are efferent neuroparacrine cells. TAU‐IR is not, however, expressed by OA‐IR interneurones in the thoracic ganglia and brain. The only other TAU‐IR somata found with peripheral axons are the medial neurosecretory cells in abdominal ganglia that project to the neurohaemal organs. These cells exhibit RFamide‐IR. The majority of TAU‐IR somata in the thoracic abdominal nervous system exhibit GABA‐IR. These cells correspond to populations of identified local and intersegmentally projecting inhibitory interneurones. TAU‐IR is not, however, exhibited by the well‐known GABAergic common inhibitor neurones, which have peripherally projecting axons. This differential distribution of TAU‐IR in basically two, functionally different, neuronal subsets (efferent neurosecretory and neuroparacrine cells, inhibitory interneurones) conforms with the concept of taurine acing as a depressive agent to limit excitation during stressful conditions. J. Comp. Neurol. 404:86–96, 1999. © 1999 Wiley‐Liss, Inc.