Abstract
Abstract Ample evidence implicates corticotropin-releasing factor (CRF)-producing neurons of the central amygdaloid nucleus (CeA) in vegetative, endocrine, and behavioral responses to stress and anxiety in laboratory rats. Monoaminergic systems are involved in modulating these responses. In the present paper, interrelations between CRF-immunoreactive (ir) neurons, and noradrenergic, serotonergic, and dopaminergic afferents were studied using single and double immunolabeling for light and electron microscopy in the rat CeA. Dopaminergic axons formed dense plexus in the CeA overlapping with the localization of CRF-ir neurons, and their terminals formed frequent associations with CRF-ir somata. Contacts of serotonergic axons on CRF-ir neurons were few, and contacts of noradrenergic axons were the exception. Ultrastructurally, symmetric synapses of dopaminergic terminals on CRF-ir somata and dendrites were found. More than 83% of CRF-ir somata were contacted in single ultrathin sections. About half of these possessed two or more contacts. Of non-ir somata, 37% were contacted by dopaminergic terminals, and only 13% of these had two or more contacts. Correlative in situ hybridization indicated that CeA CRF-ir neurons may express receptor subtype dopamine receptor subtype 2. In conclusion, dopaminergic afferents appear to specifically target CeA CRF neurons. They are thus in a position to exert significant influence on the rat amygdaloid CRF stress system.
| Original language | English |
|---|---|
| Pages (from-to) | 183-197 |
| Number of pages | 15 |
| Journal | Histochemistry and Cell Biology |
| Volume | 120 |
| Issue number | 3 |
| DOIs | |
| State | Published - Sep 1 2003 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Cell Biology
- Instrumentation
Cite this
Interrelations between monoaminergic afferents and corticotropin-releasing factor-immunoreactive neurons in the rat central amygdaloid nucleus : Ultrastructural evidence for dopaminergic control of amygdaloid stress systems. / Eliava, Marina; Yilmazer-Hanke, Deniz; Asan, Esther.
In: Histochemistry and Cell Biology, Vol. 120, No. 3, 01.09.2003, p. 183-197.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Interrelations between monoaminergic afferents and corticotropin-releasing factor-immunoreactive neurons in the rat central amygdaloid nucleus
T2 - Ultrastructural evidence for dopaminergic control of amygdaloid stress systems
AU - Eliava, Marina
AU - Yilmazer-Hanke, Deniz
AU - Asan, Esther
PY - 2003/9/1
Y1 - 2003/9/1
N2 - Abstract Ample evidence implicates corticotropin-releasing factor (CRF)-producing neurons of the central amygdaloid nucleus (CeA) in vegetative, endocrine, and behavioral responses to stress and anxiety in laboratory rats. Monoaminergic systems are involved in modulating these responses. In the present paper, interrelations between CRF-immunoreactive (ir) neurons, and noradrenergic, serotonergic, and dopaminergic afferents were studied using single and double immunolabeling for light and electron microscopy in the rat CeA. Dopaminergic axons formed dense plexus in the CeA overlapping with the localization of CRF-ir neurons, and their terminals formed frequent associations with CRF-ir somata. Contacts of serotonergic axons on CRF-ir neurons were few, and contacts of noradrenergic axons were the exception. Ultrastructurally, symmetric synapses of dopaminergic terminals on CRF-ir somata and dendrites were found. More than 83% of CRF-ir somata were contacted in single ultrathin sections. About half of these possessed two or more contacts. Of non-ir somata, 37% were contacted by dopaminergic terminals, and only 13% of these had two or more contacts. Correlative in situ hybridization indicated that CeA CRF-ir neurons may express receptor subtype dopamine receptor subtype 2. In conclusion, dopaminergic afferents appear to specifically target CeA CRF neurons. They are thus in a position to exert significant influence on the rat amygdaloid CRF stress system.
AB - Abstract Ample evidence implicates corticotropin-releasing factor (CRF)-producing neurons of the central amygdaloid nucleus (CeA) in vegetative, endocrine, and behavioral responses to stress and anxiety in laboratory rats. Monoaminergic systems are involved in modulating these responses. In the present paper, interrelations between CRF-immunoreactive (ir) neurons, and noradrenergic, serotonergic, and dopaminergic afferents were studied using single and double immunolabeling for light and electron microscopy in the rat CeA. Dopaminergic axons formed dense plexus in the CeA overlapping with the localization of CRF-ir neurons, and their terminals formed frequent associations with CRF-ir somata. Contacts of serotonergic axons on CRF-ir neurons were few, and contacts of noradrenergic axons were the exception. Ultrastructurally, symmetric synapses of dopaminergic terminals on CRF-ir somata and dendrites were found. More than 83% of CRF-ir somata were contacted in single ultrathin sections. About half of these possessed two or more contacts. Of non-ir somata, 37% were contacted by dopaminergic terminals, and only 13% of these had two or more contacts. Correlative in situ hybridization indicated that CeA CRF-ir neurons may express receptor subtype dopamine receptor subtype 2. In conclusion, dopaminergic afferents appear to specifically target CeA CRF neurons. They are thus in a position to exert significant influence on the rat amygdaloid CRF stress system.
UR - http://www.scopus.com/inward/record.url?scp=0141993528&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0141993528&partnerID=8YFLogxK
U2 - 10.1007/s00418-003-0557-9
DO - 10.1007/s00418-003-0557-9
M3 - Article
VL - 120
SP - 183
EP - 197
JO - Histochemistry and Cell Biology
JF - Histochemistry and Cell Biology
SN - 0948-6143
IS - 3
ER -