CaM kinase II-alpha activity, levels and Ca/calmodulin dependent phosphorylation of substrate proteins in mice brain during fatal murine cerebral malaria

Abstract

The activity and levels of CaM kinase II-alpha was investigated in the cytosolic and membrane fraction of mice cerebral cortex and cerebellum using an experimental model of fatal murine cerebral malaria (FMCM). In parallel, Ca2+/Calmodulin dependent phosphorylation of target substrate proteins was studied using syntide-2 as substrate. Pathology of FMCM resulted in decreased CaM kinase-II activity in both cortex and cerebellum though western analysis revealed no appreciable changes in the levels of CaM kinase-II alpha in cytosol and membrane fractions from control and cerebral malaria infected brain. Given the abundant expression of Cam kinase-II in neuronal tissue, its significance in neurotransmitter release and synthesis and signal transduction during apoptosis, decreased levels of enzyme activity and altered phosphorylation of substrate proteins by CaM kinase II may serve as important cues in understanding the CaM kinase signal transduction events central to neurological disorders during FMCM. © 2002 Elsevier Science Ireland Ltd. All rights reserved.