Effect of differential rearing on synapses and soma size in rat medial amygdaloid nucleus
作者:
Masumi Ichikawa,
Masato Matsuoka,
Yuji Mori,
期刊:
Synapse
(WILEY Available online 1993)
卷期:
Volume 13,
issue 1
页码: 50-56
ISSN:0887-4476
年代: 1993
DOI:10.1002/syn.890130107
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: Perforated synapse;Rearing environment;Plasticity;Adult rat;Quantitative study
数据来源: WILEY
摘要:
AbstractThe effects of differential rearing on synaptic morphology and neuronal size were examined in the medial amygdaloid nucleus (MAN) of adult rats. Forty‐day‐old male rats were housed in one of three ways: individually (isolated condition, IC); with four males per cage (unisexual condition, UC); or with two males and two females per cage (social condition, SC). After 2 months, the animals were prepared for electron and light microscopy Although there was no statistically significant difference in number of synapses per unit volume in MAN, the number of perforated (P) synapses, which are characterized by discontinuities in the postsynaptic density, were significantly greater in the UC and the SC than in the IC. The length of synaptic contact zone of P synapses was also longer in both the UC and the SC compared with the IC, whereas the length of nonperforated synapses was longer only in the SC. Some area was also larger in the SC compared with the IC. These results demonstrate that exposure to different rearing conditions, in which the pheromonal environment can be substantially different, can induce striking morphological changes in both synapses and neurons in the MAN of adult rats. © 1993 Wiley‐Lis
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