Abstract
Methionine-enkephalin (Met-enkephalin), leucine-enkephalin (Leu-enkephalin) and dynorphin A (1-17) (dynorphin A) concentrations in discrete brain areas were determined in the mice showing behavioral changes induced by stress using radioimmunoassay (RIA). In the present experiment, we used environment-induced conditioned suppression of motility and forced swimming-induced immobility. In the environment-induced conditioned suppression of motility, Met-enkephalin concentration in the striatum and hypothalamus significantly decreased. Leu-enkephalin concentration in the hypothalamus also decreased. Dynorphin A concentraion in the striatum decreased, but significantly increased in the hypothalamus and pituitary. In the forced swimming-induced immobility, Met-enkephalin concentration in the striatum significantly decreased. Leu-enkephalin concentration in the hypothalamus and pituitary significantly decreased. Dynorphin A concentration in the pituitary decreased, but significantly increased in the hypothalamus. Our results indicated that the concentrations of Met-enkephalin, Leu-enkephalin and dynorphin A in the discrete brain areas changed in two different stressful situations. These findings suggested that these peptides might modulate the behavioral changes induced by stressors.
| Original language | English |
|---|---|
| Pages (from-to) | 211-217 |
| Number of pages | 7 |
| Journal | Life Sciences |
| Volume | 51 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 01-01-1992 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Pharmacology
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Stress-induced changes in brain Met-enkephalin, Leu-enkephalin and dynorphin concentrations. / Nabeshima, Toshitaka; Katoh, Akira; Wada, Masako; Kameyama, Tsutomu.
In: Life Sciences, Vol. 51, No. 3, 01.01.1992, p. 211-217.Research output: Contribution to journal › Article
TY - JOUR
T1 - Stress-induced changes in brain Met-enkephalin, Leu-enkephalin and dynorphin concentrations
AU - Nabeshima, Toshitaka
AU - Katoh, Akira
AU - Wada, Masako
AU - Kameyama, Tsutomu
PY - 1992/1/1
Y1 - 1992/1/1
N2 - Methionine-enkephalin (Met-enkephalin), leucine-enkephalin (Leu-enkephalin) and dynorphin A (1-17) (dynorphin A) concentrations in discrete brain areas were determined in the mice showing behavioral changes induced by stress using radioimmunoassay (RIA). In the present experiment, we used environment-induced conditioned suppression of motility and forced swimming-induced immobility. In the environment-induced conditioned suppression of motility, Met-enkephalin concentration in the striatum and hypothalamus significantly decreased. Leu-enkephalin concentration in the hypothalamus also decreased. Dynorphin A concentraion in the striatum decreased, but significantly increased in the hypothalamus and pituitary. In the forced swimming-induced immobility, Met-enkephalin concentration in the striatum significantly decreased. Leu-enkephalin concentration in the hypothalamus and pituitary significantly decreased. Dynorphin A concentration in the pituitary decreased, but significantly increased in the hypothalamus. Our results indicated that the concentrations of Met-enkephalin, Leu-enkephalin and dynorphin A in the discrete brain areas changed in two different stressful situations. These findings suggested that these peptides might modulate the behavioral changes induced by stressors.
AB - Methionine-enkephalin (Met-enkephalin), leucine-enkephalin (Leu-enkephalin) and dynorphin A (1-17) (dynorphin A) concentrations in discrete brain areas were determined in the mice showing behavioral changes induced by stress using radioimmunoassay (RIA). In the present experiment, we used environment-induced conditioned suppression of motility and forced swimming-induced immobility. In the environment-induced conditioned suppression of motility, Met-enkephalin concentration in the striatum and hypothalamus significantly decreased. Leu-enkephalin concentration in the hypothalamus also decreased. Dynorphin A concentraion in the striatum decreased, but significantly increased in the hypothalamus and pituitary. In the forced swimming-induced immobility, Met-enkephalin concentration in the striatum significantly decreased. Leu-enkephalin concentration in the hypothalamus and pituitary significantly decreased. Dynorphin A concentration in the pituitary decreased, but significantly increased in the hypothalamus. Our results indicated that the concentrations of Met-enkephalin, Leu-enkephalin and dynorphin A in the discrete brain areas changed in two different stressful situations. These findings suggested that these peptides might modulate the behavioral changes induced by stressors.
UR - http://www.scopus.com/inward/record.url?scp=0026655027&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0026655027&partnerID=8YFLogxK
U2 - 10.1016/0024-3205(92)90077-3
DO - 10.1016/0024-3205(92)90077-3
M3 - Article
C2 - 1352028
AN - SCOPUS:0026655027
VL - 51
SP - 211
EP - 217
JO - Life Sciences
JF - Life Sciences
SN - 0024-3205
IS - 3
ER -