Abstract
To elucidate the changes in the mitochondrial redox state during spreading depression (SD), tissue NADH content was measured in 20 anesthetized gerbils by the enzymatic cycling assay in a small cortical region (0.30±0.07 mg) where the direct-current (DC)-potential was measured. Sequential imaging of NADH fluorescence with a CCD camera and continuous monitoring of DC-potential and regional CBF were also performed in another 5 gerbils. Biphasic fluorescence waves propagating at the rate of 3 mm/min were observed using the CCD camera. An initial narrow (1.6±0.4 mm) wave, which showed a modest increase in fluorescence (108±6.4%), was observed simultaneously with the onset of negative DC-deflection. During depolarization, CBF was unchanged and tissue NADH content increased to 25.3±7.9 μmol/kg brain, which was higher than the value in the sham-control (11.0±2.5 μmol/kg brain). At 30 s after the deflection, a subsequent wide (7.0±2.1 mm) wave, which showed a moderate decrease in fluorescence (87.1±5.7%), was observed simultaneously with the increase in CBF and repolarization in DC-potential. Then NADH fluorescence recovered along with normalization of CBF at 152.2±38.6 s after the onset of DC-deflection. Tissue NADH concentration sampled at 120 s after the deflection was 11.6±4.6 μmol/kg brain. Since NADH fluorescence is absorbed by hemoglobin, the initial increase and subsequent decrease in fluorescence seem to have been induced by increases in NADH content and CBF, respectively. These findings indicate that the mitochondrial redox state transiently inclines to the reduction side synchronous to the onset of DC-deflection and that it normalizes within 120 s after deflection. (C) 2000 Elsevier Science B.V.
| Original language | English |
|---|---|
| Pages (from-to) | 294-300 |
| Number of pages | 7 |
| Journal | Brain Research |
| Volume | 872 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - Jul 28 2000 |
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Keywords
- Extracellular direct-current (DC) potential
- Mitochondrial redox state
- Mongolian gerbil
- NADH fluorescence image
- Regional cerebral blood flow (regional CBF)
- Spreading depression
ASJC Scopus subject areas
- Neuroscience(all)
Cite this
Dynamic changes of NADH fluorescence images and NADH content during spreading depression in the cerebral cortex of gerbils. / Hashimoto, Megumi; Takeda, Yoshimasa; Sato, Tetsufumi; Kawahara, Hidero; Nagano, Osamu; Hirakawa, Masahisa.
In: Brain Research, Vol. 872, No. 1-2, 28.07.2000, p. 294-300.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Dynamic changes of NADH fluorescence images and NADH content during spreading depression in the cerebral cortex of gerbils
AU - Hashimoto, Megumi
AU - Takeda, Yoshimasa
AU - Sato, Tetsufumi
AU - Kawahara, Hidero
AU - Nagano, Osamu
AU - Hirakawa, Masahisa
PY - 2000/7/28
Y1 - 2000/7/28
N2 - To elucidate the changes in the mitochondrial redox state during spreading depression (SD), tissue NADH content was measured in 20 anesthetized gerbils by the enzymatic cycling assay in a small cortical region (0.30±0.07 mg) where the direct-current (DC)-potential was measured. Sequential imaging of NADH fluorescence with a CCD camera and continuous monitoring of DC-potential and regional CBF were also performed in another 5 gerbils. Biphasic fluorescence waves propagating at the rate of 3 mm/min were observed using the CCD camera. An initial narrow (1.6±0.4 mm) wave, which showed a modest increase in fluorescence (108±6.4%), was observed simultaneously with the onset of negative DC-deflection. During depolarization, CBF was unchanged and tissue NADH content increased to 25.3±7.9 μmol/kg brain, which was higher than the value in the sham-control (11.0±2.5 μmol/kg brain). At 30 s after the deflection, a subsequent wide (7.0±2.1 mm) wave, which showed a moderate decrease in fluorescence (87.1±5.7%), was observed simultaneously with the increase in CBF and repolarization in DC-potential. Then NADH fluorescence recovered along with normalization of CBF at 152.2±38.6 s after the onset of DC-deflection. Tissue NADH concentration sampled at 120 s after the deflection was 11.6±4.6 μmol/kg brain. Since NADH fluorescence is absorbed by hemoglobin, the initial increase and subsequent decrease in fluorescence seem to have been induced by increases in NADH content and CBF, respectively. These findings indicate that the mitochondrial redox state transiently inclines to the reduction side synchronous to the onset of DC-deflection and that it normalizes within 120 s after deflection. (C) 2000 Elsevier Science B.V.
AB - To elucidate the changes in the mitochondrial redox state during spreading depression (SD), tissue NADH content was measured in 20 anesthetized gerbils by the enzymatic cycling assay in a small cortical region (0.30±0.07 mg) where the direct-current (DC)-potential was measured. Sequential imaging of NADH fluorescence with a CCD camera and continuous monitoring of DC-potential and regional CBF were also performed in another 5 gerbils. Biphasic fluorescence waves propagating at the rate of 3 mm/min were observed using the CCD camera. An initial narrow (1.6±0.4 mm) wave, which showed a modest increase in fluorescence (108±6.4%), was observed simultaneously with the onset of negative DC-deflection. During depolarization, CBF was unchanged and tissue NADH content increased to 25.3±7.9 μmol/kg brain, which was higher than the value in the sham-control (11.0±2.5 μmol/kg brain). At 30 s after the deflection, a subsequent wide (7.0±2.1 mm) wave, which showed a moderate decrease in fluorescence (87.1±5.7%), was observed simultaneously with the increase in CBF and repolarization in DC-potential. Then NADH fluorescence recovered along with normalization of CBF at 152.2±38.6 s after the onset of DC-deflection. Tissue NADH concentration sampled at 120 s after the deflection was 11.6±4.6 μmol/kg brain. Since NADH fluorescence is absorbed by hemoglobin, the initial increase and subsequent decrease in fluorescence seem to have been induced by increases in NADH content and CBF, respectively. These findings indicate that the mitochondrial redox state transiently inclines to the reduction side synchronous to the onset of DC-deflection and that it normalizes within 120 s after deflection. (C) 2000 Elsevier Science B.V.
KW - Extracellular direct-current (DC) potential
KW - Mitochondrial redox state
KW - Mongolian gerbil
KW - NADH fluorescence image
KW - Regional cerebral blood flow (regional CBF)
KW - Spreading depression
UR - http://www.scopus.com/inward/record.url?scp=0034725895&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034725895&partnerID=8YFLogxK
U2 - 10.1016/S0006-8993(00)02509-9
DO - 10.1016/S0006-8993(00)02509-9
M3 - Article
C2 - 10924711
AN - SCOPUS:0034725895
VL - 872
SP - 294
EP - 300
JO - Brain Research
JF - Brain Research
SN - 0006-8993
IS - 1-2
ER -