Hexokinase redistribution in vivo.
Heterogenous stock mice in addition to mice selectively bred to maximally differ in their severity of alcohol withdrawal seizures (withdrawal seizure-resistant (WSR) and withdrawal seizure-prone (WSP] were used to provide evidence in favor of the importance of the rapidly changing distribution of brain hexokinase (ATP: D-hexose 6-phosphotransferase, EC 2.7.1.1) (HK). An ischemic response at 15, 30, 60 and 120 s after killing showed a decreasing cerebellar cytosolic HK concentration of 31%, 15%, 14% and 10% while the cerebral concentrations were 23%, 13%, 13% and 14%, respectively. WSR and WSP mice given an acute i.p. dose of 4 g/kg of alcohol showed opposite HK responses. Cytosolic HK in WSR mice decreased 18.5%, while WSP mice showed an increase of 20.3% over paired saline-injected controls. When ischemia was allowed to proceed in WSP mice following an in vivo alcohol treatment, cytosolic HK decreased in parallel to mice not given alcohol. These data suggest that alcohol can cause an HK redistribution in vivo which could play a role in the differing sensitivities of WSR and WSP mice to alcohol related seizures.
Laursen
S E
SE
Department of Anatomy and Cell Biology, University of North Dakota, Grand Forks 58202.
Belknap
J K
JK
Sampson
K E
KE
Knull
H R
HR
D000818:Animals; D001921:Brain / Q000201:enzymology*; D000431:Ethanol / Q000633:toxicity*; D006593:Hexokinase / Q000032:analysis* / Q000302:isolation & purification; D007511:Ischemia / Q000201:enzymology*; D051379:Mice; D012640:Seizures / Q000209:etiology; D013375:Substance Withdrawal Syndrome / Q000201:enzymology*; D014018:Tissue Distribution
D000431:Ethanol; D006593:Hexokinase