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Polyamine changes in reversible cerebral ischemia.

W Paschen, R Schmidt-Kastner, B Djuricic

    Journal of Neurochemistry
    |July 1, 1987
    PubMed
    Summary
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    During brain ischemia, polyamine levels remained stable. Post-ischemic recirculation led to a significant putrescine increase, potentially causing delayed neuronal death.

    Area of Science:

    • Neuroscience
    • Biochemistry
    • Pathophysiology

    Background:

    • Polyamines (putrescine, spermidine, spermine) are crucial for cell function.
    • Brain ischemia can lead to neuronal damage and death.
    • The role of polyamines during post-ischemic recovery is not fully understood.

    Purpose of the Study:

    • To investigate changes in polyamine levels in rat brain regions during and after forebrain ischemia.
    • To explore the potential link between polyamine accumulation and delayed neuronal death.

    Main Methods:

    • Severe forebrain ischemia was induced in rats by occluding carotid and vertebral arteries for 30 minutes.
    • Polyamine levels (putrescine, spermidine, spermine) were measured in the cortex, caudoputamen, and hippocampus.
    • Measurements were taken during ischemia and subsequent recirculation periods.

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    Main Results:

    • Polyamine levels showed no significant change during the ischemic period.
    • Following recirculation, putrescine levels markedly increased in brain regions.
    • Spermine and spermidine levels remained stable, except for a decline in the caudoputamen after 24 hours.
    • Increased putrescine is attributed to ornithine decarboxylase activation and S-adenosylmethionine decarboxylase inhibition.

    Conclusions:

    • Post-ischemic recirculation triggers a significant increase in putrescine.
    • This putrescine accumulation may be a key factor in delayed neuronal death after ischemia.
    • Further research is needed to elucidate the precise mechanisms involved.