Abstract
The behavioral and neurochemical changes in the chronic phase of permanent occlusion of the right middle cerebral artery (MCA) in rats were investigated. One month after MCA occlusion, 23 rats were unable to solve a radial eight-arm maze task during an entire 1-month period, whereas seven rats were able to solve this task. Three months after occlusion, 19 MCA- occluded rats failed to solve the task successfully again for at least 1 month (the cognitively impaired rats), whereas 11 MCA-occluded rats were able to solve it (the cognitively unimpaired rats). The rats that underwent behavioral testing were examined for any changes in the acetylcholine (ACh) levels in the hippocampus using HPLC with electrochemical detection or the formation of long-term potentiation (LTP) in the population spike of the hippocampal CA1 field. The immunohistochemical distribution of either the microtubule-associated protein 2 (MAP2) or glial fibrillary acidic protein (GFAP) in the hippocampus of the cognitively impaired rats was also studied. In the cognitively impaired rats, neither the suppression of the induction of LTP, nor the degradation of MAP2, nor the increase in the GFAP immunoreactivity was observed in the hippocampus. The levels of ACh in the hippocampus did not change significantly among the cognitively impaired, unimpaired, and the sham-operated rats. These results suggest that MCA occlusion is capable of producing long-term spatial cognitive disturbance in rats without any evidence of neurobiological damage in the hippocampus.
| Original language | English |
|---|---|
| Pages (from-to) | 1012-1021 |
| Number of pages | 10 |
| Journal | Journal of Cerebral Blood Flow and Metabolism |
| Volume | 15 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Jan 1 1995 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Neurology
- Clinical Neurology
- Cardiology and Cardiovascular Medicine
Cite this
Long-term spatial cognitive impairment after middle cerebral artery occlusion in rats : No involvement of the hippocampus. / Okada, Mitsuko; Nakanishi, Hiroshi; Tamura, Akira; Urae, Akinori; Mine, Kazunori; Yamamoto, Kenji; Fujiwara, Michihiro.
In: Journal of Cerebral Blood Flow and Metabolism, Vol. 15, No. 6, 01.01.1995, p. 1012-1021.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Long-term spatial cognitive impairment after middle cerebral artery occlusion in rats
T2 - No involvement of the hippocampus
AU - Okada, Mitsuko
AU - Nakanishi, Hiroshi
AU - Tamura, Akira
AU - Urae, Akinori
AU - Mine, Kazunori
AU - Yamamoto, Kenji
AU - Fujiwara, Michihiro
PY - 1995/1/1
Y1 - 1995/1/1
N2 - The behavioral and neurochemical changes in the chronic phase of permanent occlusion of the right middle cerebral artery (MCA) in rats were investigated. One month after MCA occlusion, 23 rats were unable to solve a radial eight-arm maze task during an entire 1-month period, whereas seven rats were able to solve this task. Three months after occlusion, 19 MCA- occluded rats failed to solve the task successfully again for at least 1 month (the cognitively impaired rats), whereas 11 MCA-occluded rats were able to solve it (the cognitively unimpaired rats). The rats that underwent behavioral testing were examined for any changes in the acetylcholine (ACh) levels in the hippocampus using HPLC with electrochemical detection or the formation of long-term potentiation (LTP) in the population spike of the hippocampal CA1 field. The immunohistochemical distribution of either the microtubule-associated protein 2 (MAP2) or glial fibrillary acidic protein (GFAP) in the hippocampus of the cognitively impaired rats was also studied. In the cognitively impaired rats, neither the suppression of the induction of LTP, nor the degradation of MAP2, nor the increase in the GFAP immunoreactivity was observed in the hippocampus. The levels of ACh in the hippocampus did not change significantly among the cognitively impaired, unimpaired, and the sham-operated rats. These results suggest that MCA occlusion is capable of producing long-term spatial cognitive disturbance in rats without any evidence of neurobiological damage in the hippocampus.
AB - The behavioral and neurochemical changes in the chronic phase of permanent occlusion of the right middle cerebral artery (MCA) in rats were investigated. One month after MCA occlusion, 23 rats were unable to solve a radial eight-arm maze task during an entire 1-month period, whereas seven rats were able to solve this task. Three months after occlusion, 19 MCA- occluded rats failed to solve the task successfully again for at least 1 month (the cognitively impaired rats), whereas 11 MCA-occluded rats were able to solve it (the cognitively unimpaired rats). The rats that underwent behavioral testing were examined for any changes in the acetylcholine (ACh) levels in the hippocampus using HPLC with electrochemical detection or the formation of long-term potentiation (LTP) in the population spike of the hippocampal CA1 field. The immunohistochemical distribution of either the microtubule-associated protein 2 (MAP2) or glial fibrillary acidic protein (GFAP) in the hippocampus of the cognitively impaired rats was also studied. In the cognitively impaired rats, neither the suppression of the induction of LTP, nor the degradation of MAP2, nor the increase in the GFAP immunoreactivity was observed in the hippocampus. The levels of ACh in the hippocampus did not change significantly among the cognitively impaired, unimpaired, and the sham-operated rats. These results suggest that MCA occlusion is capable of producing long-term spatial cognitive disturbance in rats without any evidence of neurobiological damage in the hippocampus.
UR - http://www.scopus.com/inward/record.url?scp=0028858602&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028858602&partnerID=8YFLogxK
U2 - 10.1038/jcbfm.1995.127
DO - 10.1038/jcbfm.1995.127
M3 - Article
C2 - 7593333
AN - SCOPUS:0028858602
VL - 15
SP - 1012
EP - 1021
JO - Journal of Cerebral Blood Flow and Metabolism
JF - Journal of Cerebral Blood Flow and Metabolism
SN - 0271-678X
IS - 6
ER -