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Muscarinic acetylcholine receptor immunoreactivity in the amygdala--II. Fear-induced plasticity.

Abstract：

:Changes in the distribution of muscarinic acetylcholine receptor-immunoreactive neurons were examined in the amygdaloid complex at different time-intervals following a single training session of active shock avoidance in a two-way shuttle-box. Muscarinic acetylcholine receptors were visualized using M35, a monoclonal antibody raised against purified muscarinic acetylcholine receptor protein. Both in naive animals and 2 h after active shock avoidance training, muscarinic acetylcholine receptor immunoreactivity was high in the central nucleus, and only low to moderate in other amygdaloid regions. Twenty-four hours after training, however, the muscarinic acetylcholine receptor immunoreactivity distribution pattern was reversed, showing a dramatic increase in the corticomedial nucleus, while in contrast, in other amygdaloid regions including the central nucleus, muscarinic acetylcholine receptor immunoreactivity was reduced to only a few scattered neurons. Additional studies with a modified experimental design indicated that fear conditioning mechanisms in association with the severity of the aversive stimuli, and not the learning of the avoidance response, may account for the changes in muscarinic acetylcholine receptor immunoreactivity in the amygdala. These results are consistent with the prominent role of the central nucleus in the conditioning and expression of the fear response. A closer examination revealed that 8 h after training the changes in both the central and corticomedial nuclei became significant. The differences still existed after 25 days, but three months after the training session the receptor distribution was returned to normal. The long-lasting, but reversible nature of these changes indicates that fear conditioning is accompanied by a dynamic plasticity of muscarinic acetylcholine receptor immunoreactivity in the amygdaloid complex.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Roozendaal B,van der Zee EA,Hensbroek RA,Maat H,Luiten PG,Koolhaas JM,Bohus B

doi

10.1016/s0306-4522(96)00360-0

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

75-83

issue

1

eissn

0306-4522

issn

1873-7544

pii

S0306452296003600

journal_volume

76

pub_type

杂志文章

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