The effects of repeated endotoxin exposure on rat brain metabolites as measured by ex vivo 1HMRS.
Abnormalities in brain chemistry induced by acute or chronic treatment with LPS were studied in the rat model. Ex vivo brain metabolites were measured using proton magnetic resonance spectroscopy, whereas serum corticosterone levels were determined using radioimmunoassay. We observed increased lactate levels in all measured brain regions and decreased choline in the hypothalamus after chronic LPS treatment. Acute LPS treatment led to an elevation of corticosterone, whereas chronic LPS treatment led to attenuation of the HPA response. These findings suggest that chronic inflammation induced by LPS could lead to cell loss/dysfunction, and hence, desensitization of the HPA axis, particularly in the hypothalamus.
Department of Biology, Seton Hall University, 400 South Orange Avenue, South Orange, NJ 07079, USA. changsul@shu.edu
Sulie L
SL
Chang
Christine C
CC
Cloak
Lorenc
L
Malellari
Linda
L
Chang
D000818:Animals; D001921:Brain / Q000187:drug effects* / Q000378:metabolism*; D002794:Choline / Q000378:metabolism; D003345:Corticosterone / Q000097:blood; D004334:Drug Administration Schedule; D004731:Endotoxins / Q000008:administration & dosage* / Q000494:pharmacology; D007031:Hypothalamus / Q000187:drug effects / Q000378:metabolism; D007773:Lactates / Q000378:metabolism; D008070:Lipopolysaccharides / Q000008:administration & dosage / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D011522:Protons; D011863:Radioimmunoassay; D051381:Rats; D017207:Rats, Sprague-Dawley
D004731:Endotoxins; D007773:Lactates; D008070:Lipopolysaccharides; D011522:Protons; D002794:Choline; D003345:Corticosterone