NDLI: Nitration as a Mechanism of Na+, K+-ATPase Modification During Hypoxia in the Cerebral Cortex of the Guinea Pig Fetus

Content Provider	Springer Nature Link
Author	Qayyum, Imran Zubrow, Alan B. Ashraf, Qazi M. Kubin, Joanna Delivoria Papadopoulos, Maria Mishra, Om P.
Copyright Year	2001
Abstract	Previous studies have shown that hypoxia induces nitric oxide synthase-mediated generation of nitric oxide free radicals leading to peroxynitrite production. The present study tests the hypothesis that hypoxia results in NO-mediated modification of Na$^{+}$, K$^{+}$-ATPase in the fetal brain. Studies were conducted in guinea pig fetuses of 58-days gestation. The mothers were exposed to FiO$_{2}$ of 0.07% for 1 hour. Brain tissue hypoxia in the fetus was confirmed biochemically by decreased ATP and phosphocreatine levels. P$_{2}$ membrane fractions were prepared from normoxic and hypoxic fetuses and divided into untreated and treated groups. The membranes were treated with 0.5 mM peroxynitrite at pH 7.6. The Na$^{+}$, K$^{+}$-ATPase activity was determined at 37°C for five minutes in a medium containing 100 mM NaCl, 20 mM KCl, 6.0 mM MgCl$_{2}$, 50 mM Tris HCl buffer pH 7.4, 3.0 mM ATP with or without 10 mM ouabain. Ouabain sensitive activity was referred to as Na$^{+}$, K$^{+}$-ATPase activity. Following peroxynitrite exposure, the activity of Na$^{+}$, K$^{+}$-ATPase in guinea pig brain was reduced by 36% in normoxic membranes and further 29% in hypoxic membranes. Enzyme kinetics was determined at varying concentrations of ATP (0.5 mM-2.0 mM). The results indicate that peroxynitrite treatment alters the affinity of the active site of Na$^{+}$, K$^{+}$-ATPase for ATP and decreases the Vmax by 35% in hypoxic membranes. When compared to untreated normoxic membranes Vmax decreases by 35.6% in treated normoxic membranes and further to 52% in treated hypoxic membranes. The data show that peroxynitrite treatment induces modification of Na$^{+}$, K$^{+}$-ATPase. The results demonstrate that peroxynitrite decreased activity of Na$^{+}$, K$^{+}$-ATPase enzyme by altering the active sites as well as the microenvironment of the enzyme. We propose that nitric oxide synthase-mediated formation of peroxynitrite during hypoxia is a potential mechanism of hypoxia-induced decrease in Na$^{+}$, K$^{+}$-ATPase activity.
Starting Page	1163
Ending Page	1169
Page Count	7
File Format	PDF
ISSN	03643190
Journal	Neurochemical Research
Volume Number	26
Issue Number	10
e-ISSN	15736903
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Neurosciences Neurology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Biochemistry Cellular and Molecular Neuroscience

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