Brain energy stores in C57BL/6 mice after C. parvum injection.
Activation of the immune system has been associated with the development of fatigue of unknown cause. We were interested in brain energy stores (e.g., phosphocreatine (PCr) and creatine kinase) after immune activation to investigate whether this system was altered. In this model, fatigue (defined as > 50% reduction in spontaneous running) was induced in C57BL/6 mice after a single injection of Corynebacterium parvum antigen. Maximal fatigue (about 86% reduction on day 10 post injection) was associated with reduced (about 29%) brain PCr/gamma-ATP and increased creatine kinase levels (approximately 31%), suggesting an active process of brain ATP depletion and replenishment. These findings need to be further delineated to establish the relationship between immune activation, reduced brain energy pools and fatigue.
Sheng
W S
WS
Neuroimmunobiology and Host Defense Laboratory, Minneapolis Medical Research Foundation and the University of Minnesota Medical School, 55404, USA.
Lin
J C
JC
Apple
F
F
Hu
S
S
Peterson
P K
PK
Chao
C C
CC
D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology*; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D007267:Injections; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D008810:Mice, Inbred C57BL; D011425:Propionibacterium acnes / Q000276:immunology*
D000942:Antigens, Bacterial