Abstract
The present study was designed to examine the effect of a calcium antagonist isradipine (PN200110: PN) on local cerebral blood flow and brain tissue metabolism after 1-hour supratentorial ischemia induced by bilateral carotid artery ligation (BCL) in spontaneously hypertensive rats (SHR). PN, dissolved in ethanol plus polyethylene glycol 400, diluted with saline to make the final concentration of 0.25 mg/ml and 2.5 mg/ml, was administered subcutaneously either 30 min prior to BCL or just after the induction of incomplete cerebral ischemia (n = 7 in each group). Vehicle injection was served as a control group (n = 7). Cerebral blood flow in the parietal cortex (CBF) and the cerebellar cortex (CeBF) was measured by hydrogen clearance technique, and the supra- and infratentorial metabolites of the brain frozen in situ were determined by the enzymatic method. Blood pressure was lowered, but CBF was increased by PN administration in pre-BCL treatment study. After 1 hour of BCL, CBF decreased to around 10% or less of the resting value, being insignificant among the groups. Brain adenosine triphosphate was better preserved in PN-administered groups. The increase in lactate level tended to reduce dose dependently by PN treatment. PN also reduced the metabolic alterations in brain tissue with significance, even when administered just after the induction of forebrain ischemia. It is considered that pre- as well as post-BCL administration of PN is beneficial to attenuate the metabolic alterations in incomplete forebrain ischemia in SHR.
| Original language | English |
|---|---|
| Pages (from-to) | 349-355 |
| Number of pages | 7 |
| Journal | Neurochemical Research |
| Volume | 25 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Apr 2 2000 |
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All Science Journal Classification (ASJC) codes
- Biochemistry
- Cellular and Molecular Neuroscience
Cite this
Calcium antagonist isradipine reduces metabolic alterations in acute cerebral ischemia in spontaneously hypertensive rats. / Ibayashi, Setsuro; Nagao, Tetsuhiko; Kitazono, Takanari; Ooboshi, Hiroaki; Kitayama, Jiro; Sadoshima, Seizo; Fujishima, Masatoshi.
In: Neurochemical Research, Vol. 25, No. 3, 02.04.2000, p. 349-355.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Calcium antagonist isradipine reduces metabolic alterations in acute cerebral ischemia in spontaneously hypertensive rats
AU - Ibayashi, Setsuro
AU - Nagao, Tetsuhiko
AU - Kitazono, Takanari
AU - Ooboshi, Hiroaki
AU - Kitayama, Jiro
AU - Sadoshima, Seizo
AU - Fujishima, Masatoshi
PY - 2000/4/2
Y1 - 2000/4/2
N2 - The present study was designed to examine the effect of a calcium antagonist isradipine (PN200110: PN) on local cerebral blood flow and brain tissue metabolism after 1-hour supratentorial ischemia induced by bilateral carotid artery ligation (BCL) in spontaneously hypertensive rats (SHR). PN, dissolved in ethanol plus polyethylene glycol 400, diluted with saline to make the final concentration of 0.25 mg/ml and 2.5 mg/ml, was administered subcutaneously either 30 min prior to BCL or just after the induction of incomplete cerebral ischemia (n = 7 in each group). Vehicle injection was served as a control group (n = 7). Cerebral blood flow in the parietal cortex (CBF) and the cerebellar cortex (CeBF) was measured by hydrogen clearance technique, and the supra- and infratentorial metabolites of the brain frozen in situ were determined by the enzymatic method. Blood pressure was lowered, but CBF was increased by PN administration in pre-BCL treatment study. After 1 hour of BCL, CBF decreased to around 10% or less of the resting value, being insignificant among the groups. Brain adenosine triphosphate was better preserved in PN-administered groups. The increase in lactate level tended to reduce dose dependently by PN treatment. PN also reduced the metabolic alterations in brain tissue with significance, even when administered just after the induction of forebrain ischemia. It is considered that pre- as well as post-BCL administration of PN is beneficial to attenuate the metabolic alterations in incomplete forebrain ischemia in SHR.
AB - The present study was designed to examine the effect of a calcium antagonist isradipine (PN200110: PN) on local cerebral blood flow and brain tissue metabolism after 1-hour supratentorial ischemia induced by bilateral carotid artery ligation (BCL) in spontaneously hypertensive rats (SHR). PN, dissolved in ethanol plus polyethylene glycol 400, diluted with saline to make the final concentration of 0.25 mg/ml and 2.5 mg/ml, was administered subcutaneously either 30 min prior to BCL or just after the induction of incomplete cerebral ischemia (n = 7 in each group). Vehicle injection was served as a control group (n = 7). Cerebral blood flow in the parietal cortex (CBF) and the cerebellar cortex (CeBF) was measured by hydrogen clearance technique, and the supra- and infratentorial metabolites of the brain frozen in situ were determined by the enzymatic method. Blood pressure was lowered, but CBF was increased by PN administration in pre-BCL treatment study. After 1 hour of BCL, CBF decreased to around 10% or less of the resting value, being insignificant among the groups. Brain adenosine triphosphate was better preserved in PN-administered groups. The increase in lactate level tended to reduce dose dependently by PN treatment. PN also reduced the metabolic alterations in brain tissue with significance, even when administered just after the induction of forebrain ischemia. It is considered that pre- as well as post-BCL administration of PN is beneficial to attenuate the metabolic alterations in incomplete forebrain ischemia in SHR.
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UR - http://www.scopus.com/inward/citedby.url?scp=0034098821&partnerID=8YFLogxK
U2 - 10.1023/A:1007536919827
DO - 10.1023/A:1007536919827
M3 - Article
C2 - 10761978
AN - SCOPUS:0034098821
VL - 25
SP - 349
EP - 355
JO - Neurochemical Research
JF - Neurochemical Research
SN - 0364-3190
IS - 3
ER -