Glial alkalinization detected in vivo by 1H-15N heteronuclear multiple-quantum coherence-transfer NMR in severely hyperammonemic rat.
Brain [5-15N] glutamine amide protons were selectively observed in vivo by 1H-15N heteronuclear multiple-quantum coherence-transfer NMR in spontaneously breathing, severely hyperammonemic rats during intravenous [15N]ammonium acetate infusion and the subsequent recovery period. The linewidth of brain [5-15N]-glutamine amide proton Hz increased from 36 +/- 2 Hz at 3.4 h to 58 +/- 6 Hz after 5.7 h of infusion, a net increase of 22 +/- 6 Hz. Concomitantly, brain ammonia concentration increased from 1.7 to 3.5 +/- 0.2 mumol/g and the rat progressed from grade III to grade IV encephalopathy. On recovery to grade III and decrease of brain ammonia concentration to 1.3 mumol/g, the linewidth returned to 37 +/- 2 Hz. In aqueous solution, [5-15N]glutamine amide proton Hz underwent a 17-Hz linebroadening when pH was raised from 7.1 to 7.5 at 37 degrees C, due to the increased rate of base-catalyzed exchange with water proton. Hence, linebroadening is a sensitive measure of changing intracellular pH. The 22-Hz linebroadening observed in vivo in severely hyperammonemic grade IV rats strongly suggests that the intracellular pH increases from 7.1 to about 7.4-7.5 in astrocytes where glutamine is synthesized and mainly stored. Probable mechanisms for the ammonia-induced alkalinization and decreased intraglial buffering capacity, as well as implications of the result for pathogenesis of hepatic encephalopathy, are discussed.
Kanamori
K
K
Magnetic Resonance Spectroscopy Laboratory, Huntington Medical Research Institutes, Pasadena, California 91105, USA.
Ross
B D
BD
D000468:Alkalies / Q000378:metabolism*; D000577:Amides / Q000378:metabolism; D000641:Ammonia / Q000097:blood* / Q000378:metabolism; D000818:Animals; D001927:Brain Diseases / Q000378:metabolism; D005973:Glutamine / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D009457:Neuroglia / Q000378:metabolism*; D009587:Nitrogen Isotopes; D009994:Osmolar Concentration; D011522:Protons; D051381:Rats; D017208:Rats, Wistar
D000468:Alkalies; D000577:Amides; D009587:Nitrogen Isotopes; D011522:Protons; D005973:Glutamine; D000641:Ammonia