What does this research mean for the field?

The three nitric oxide synthase isoforms (nNOS, eNOS, and iNOS) exhibit distinct temporal expression patterns and cellular localizations following transient focal cerebral ischemia, suggesting they play different roles at various stages of ischemic brain damage. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To characterize the temporal and spatial expression patterns of neuronal, endothelial, and inducible nitric oxide synthase isoforms following transient focal cerebral ischemia.

January 1, 2001Neurologia medico-chirurgicaOpen Access

Time Course of Expression of Three Nitric Oxide Synthase Isoforms After Transient Middle Cerebral Artery Occlusion in Rats.

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To characterize the temporal and spatial expression patterns of neuronal, endothelial, and inducible nitric oxide synthase isoforms following transient focal cerebral ischemia.
Induced 2 hours of transient middle cerebral artery occlusion in 32 male Wistar rats via intraluminal nylon thread insertion.
Harvested brains at 0 (n=6), 6 (n=6), 24 (n=8), 72 (n=6), and 168 (n=6) hours post-occlusion for immunohistochemical evaluation using polyclonal antibodies against nNOS, eNOS, and iNOS.
Neuronal NOS-positive neurons increased from 41.6 ± 5.8 in the control hemisphere to 88.3 ± 18.9 in the ischemic border zone at 6 hours, followed by a decrease to 36.4 ± 3.6 at 72 hours and 26.3 ± 7.3 at 168 hours.
Endothelial NOS was faintly present in microvascular endothelium at 6 hours and intensified through 168 hours, whereas inducible NOS appeared faintly in microvessels at 6 hours and localized strongly to core macrophages and border-zone astrocytes at 72 and 168 hours.

Structured PICO

Population

32 male Wistar rats subjected to transient middle cerebral artery (MCA) occlusion

Intervention

Transient middle cerebral artery (MCA) occlusion for 2 hours

Comparator

Control hemisphere

Outcome

Expression of neuronal NOS (nNOS), endothelial NOS (eNOS), and inducible NOS (iNOS) detected by immunohistochemical methodsurrogate

The three nitric oxide synthase isoforms exhibit distinct temporal expression patterns after transient ischemic stroke in rats, suggesting the potential need for stage-specific tailored therapeutic interventions.

Discussion

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Implication

May inform timing of NOS-targeted stroke therapies; leaves open clinical translation from rodent data.

Cite This Study

NIWA et al. (2001) studied this question.

synapsesocial.com/papers/6a1eaaa049c1593eca9a6d4e https://doi.org/10.2176/nmc.41.63

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Time Course of Expression of Three Nitric Oxide Synthase Isoforms After Transient Middle Cerebral Artery Occlusion in Rats.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Time Course of Expression of Three Nitric Oxide Synthase Isoforms After Transient Middle Cerebral Artery Occlusion in Rats.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

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