A reversible component of cerebral injury as identified by the histochemical stain 2,3,5-triphenyltetrazolium chloride (TTC).
The extent of histochemical change following middle cerebral artery occlusion was quantitatively determined in three groups of Sprague-Dawley rats with 2,3,5-triphenyltetrazolium chloride (a marker of mitochondrial oxidative enzyme function). In group I (n = 7) occlusion was maintained for 3 h, with immediate sacrifice. In group II (n = 7) occlusion was maintained for 5 h, with immediate sacrifice. In group III (n = 7) occlusion was maintained for 3 h, followed by a 2-h period of reperfusion prior to sacrifice. The area of injury was significantly larger (P less than 0.05) in the 5-h occlusion group [15 +/- 4% (mean +/- SD)] compared to the 3-h occlusion group (9 +/- 2%); indicating a time-dependent worsening of the histochemical detection of injury. However, the area of injury was significantly less in the reperfusion group (5 +/- 2%) compared to the group that was evaluated after 3 h of occlusion without reperfusion (9 +/- 2%); indicating that some component of the injury revealed by 2,3,5-triphenyltetrazolium chloride is potentially reversible. These data suggest that contrary to previous understanding, the histochemical abnormality revealed by 2,3,5-triphenyltetrazolium chloride is reversible in some circumstances and does not necessarily represent inevitable infarction.
Cole
D J
DJ
Department of Anesthesiology, Loma Linda University, CA 92354.
Drummond
J C
JC
Ghazal
E A
EA
Shapiro
H M
HM
D000818:Animals; D001157:Arterial Occlusive Diseases / Q000473:pathology* / Q000503:physiopathology; D001921:Brain / Q000473:pathology*; D002539:Cerebral Arterial Diseases / Q000473:pathology* / Q000503:physiopathology; D007839:Functional Laterality; D002546:Ischemic Attack, Transient / Q000473:pathology* / Q000503:physiopathology; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D013194:Staining and Labeling; D013778:Tetrazolium Salts
D013778:Tetrazolium Salts; C009591:triphenyltetrazolium