Effect of mechanogated membrane ion channel blockers on experimental traumatic brain oedema.
Traumatic head injury leads to marked swelling of endothelial cells, both in human patients and in Marmarou's rat model. We used this model to test the hypothesis of mechanogated ion channels being involved in the formation of traumatic brain oedema. All mechanogated channel blockers tested (gadolinium, amiloride, gentamicin) significantly reduced traumatic brain oedema evaluated by Evans blue extraction ratio, either when given 15 minutes before or 30 minutes after induction of trauma (evaluation 2 hours after trauma). These results clearly support our hypothesis, opening a new way for the investigation of the treatment of a clinical situation endowed with high morbidity and mortality.
Vaz
R
R
Institute of Pharmacology and Therapeutics, Medical Faculty, Hospital S. João, Porto, Portugal.
Sarmento
A
A
Borges
N
N
Cruz
C
C
Azevedo
I
I
D000584:Amiloride / Q000494:pharmacology*; D000818:Animals; D001812:Blood-Brain Barrier / Q000187:drug effects; D001929:Brain Edema / Q000473:pathology*; D002543:Cerebral Hemorrhage / Q000473:pathology; D004730:Endothelium, Vascular / Q000187:drug effects / Q000294:innervation / Q000473:pathology; D005682:Gadolinium / Q000494:pharmacology*; D005839:Gentamicins / Q000494:pharmacology*; D016489:Head Injuries, Closed / Q000473:pathology*; D006801:Humans; D007473:Ion Channels / Q000187:drug effects*; D008465:Mechanoreceptors / Q000187:drug effects / Q000473:pathology; D051381:Rats; D017208:Rats, Wistar; D013345:Subarachnoid Hemorrhage / Q000473:pathology
D005839:Gentamicins; D007473:Ion Channels; D000584:Amiloride; D005682:Gadolinium