Abstract |
Reversible cerebral ischemia (of 5 min, 15 min, or 3-times 5 min) was produced in 14 Mongolian gerbils by occluding both common carotid arteries. After 72 h of recirculation, brains were frozen and processed for measuring regional levels of the polyamines putrescine, spermidine and spermine using HPLC and fluorescent detector. Ischemia induced a marked increase in putrescine levels throughout the brain, most pronounced after 3-times 5 min ischemia (P less than or equal to 0.05 - P less than or equal to 0.001). Spermine levels were significantly reduced, in the hippocampal CA1-subfield after 5 min of ischemia and, in addition, in the striatum and thalamus after 3-times 5 min ischemia. It is suggested that polyamines are released from necrotic neurons and cleared into the blood. Spermine, released from neurons into the extracellular compartment, may bind to the N-methyl-D-aspartate ( NMDA) receptor of cells located in close vicinity and may thus render neurons vulnerable to otherwise subtoxic levels of excitotoxins.
|
Authors | W Paschen, R Widmann, C Weber |
Journal | Neuroscience letters
(Neurosci Lett)
Vol. 135
Issue 1
Pg. 121-4
(Jan 20 1992)
ISSN: 0304-3940 [Print] Ireland |
PMID | 1542427
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- Polyamines
- Spermine
- Spermidine
- Putrescine
|
Topics |
- Animals
- Brain
(metabolism)
- Female
- Gerbillinae
- Ischemic Attack, Transient
(metabolism)
- Neurons
(metabolism)
- Organ Specificity
- Polyamines
(metabolism)
- Putrescine
(metabolism)
- Spermidine
(metabolism)
- Spermine
(metabolism)
- Time Factors
|