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Neurochemical compartments in the human forebrain: Evidence for a high density of secretoneurin‐like immunoreactivity in the extended amygdala
Author(s) -
Kaufmann Walter A.,
Barnas Usso,
Maier Johann,
Saria Alois,
Alheid George F.,
Marksteiner Josef
Publication year - 1997
Publication title -
synapse
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.809
H-Index - 106
eISSN - 1098-2396
pISSN - 0887-4476
DOI - 10.1002/(sici)1098-2396(199706)26:2<114::aid-syn3>3.0.co;2-b
Subject(s) - substantia innominata , stria terminalis , ventral pallidum , basal forebrain , extended amygdala , neuroscience , biology , nucleus accumbens , central nucleus of the amygdala , basal ganglia , amygdala , globus pallidus , cholinergic , dopamine , central nervous system
Secretoneurin is a 33‐amino acid neuropeptide produced by endoproteolytic processing from secretogranin II, which is a member of the chromogranin/secretogranin family. In this immunocytochemical study we investigated the localization of secretoneurin‐like immunoreactivity in the human substantia innominata in relation to the ventral striatopallidal system, the bed nucleus‐amygdala complex and the basal nucleus of Meynert. A high density of secretoneurin immunostaining was found in the medial part of the nucleus accumbens. All subdivisions of the bed nucleus of the stria terminalis displayed a very prominent immunostaining for secretoneurin, whereas substance P and enkephalin showed a more restricted distribution. A high concentration of secretoneurin immunoreactivity was also observed in the central and medial amygdaloid nuclei. In the lateral bed nucleus of the stria terminalis and the sublenticular substantia innominata, the appearance of secretoneurin immunoreactivity was very similar to that of enkephalinlike immunoreactivity, exhibiting mostly peridendritic and perisomatic staining. The ventral pallidum and the inner pallidal segment displayed strong secretoneurin immunostaining. Secretoneurin did not label cholinergic neurons in the basal forebrain. This study demonstrates that secretoneurin‐like immunoreactivity is prominent in the bed nucleus‐amygdala complex, referred to as extended amygdala. The distribution of secretoneurin‐like immunoreactivity in comparison with that of other neuroanatomical markers suggests that this forebrain system is a discret compartment in the human forebrain. Synapse 26:114–130, 1997. © 1997 Wiley‐Liss, Inc.