The effect of ammonia and pH on brain gamma-glutamyl transpeptidase in young rats

. 1992 Apr 06 ; 300 (3) : 247-50.

Jazyk angličtina Země Anglie, Velká Británie Médium print

Typ dokumentu srovnávací studie, časopisecké články, práce podpořená grantem

Perzistentní odkaz   https://www.medvik.cz/link/pmid01348230
Odkazy

PubMed 1348230
DOI 10.1016/0014-5793(92)80855-b
PII: 0014-5793(92)80855-B
Knihovny.cz E-zdroje

Acute hyperammonemia, induced by two consecutive injections of ammonium acetate (550 and 450 mg per kg b.wt.), decreased the activity of gamma-glutamyl transpeptidase (GGT) in most brain regions of 18- and 30-day-old rats. This decrease in the brain GGT activity was more pronounced in younger than in older rats. After the addition of NH4Cl to the incubation medium, the inhibitory action of NH4+ on this enzyme activity was also demonstrated in crude synaptosomal membranes at pH 7.4, but in a range of NH4+ concentrations many-times higher than those found in the plasma or brains of young hyperammonemic rats. Because similar concentrations of NH4+ stimulated the activity of the purified enzyme from rat kidney (mainly at pH 9.0), the inhibition of GGT activity in the young rat brain is probably mediated indirectly and not by a direct interaction of ammonia with the enzyme molecules.

Citace poskytuje Crossref.org

Najít záznam

Citační ukazatele

Nahrávání dat ...

Možnosti archivace

Nahrávání dat ...