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Stimulation of mouse brain gamma-hydroxybutyric acid transport by pyridoxal 5'-phosphate. 1994

G Tunnicliff
Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Evansville 47712.

A synaptosomal preparation from mouse brain transported gamma-hydroxybutyric acid in a manner displaying saturation kinetics. A Kt of 48 +/- 11 microM was calculated. In the presence of pyridoxal 5'-phosphate, uptake was markedly enhanced. Stimulation of uptake was observed with increasing concentrations of pyridoxal 5'-phosphate, up to a maximum of about 3.5 mM. Increasing concentrations above this value led to a steady decrease in the stimulation of uptake, till at 7 mM pyridoxal 5'-phosphate and above there was a noticeable inhibition of uptake. The presence of increasing concentrations of gamma-hydroxybutyric acid gradually reduced the amount of stimulation, thus pyridoxal 5'-phosphate appeared to be producing its effect by reducing the Kt of the transport system rather than increasing its Vmax.

UI MeSH Term Description Entries
D008297 Male Males
D008813 Mice, Inbred ICR An inbred strain of mouse that is used as a general purpose research strain, for therapeutic drug testing, and for the genetic analysis of CARCINOGEN-induced COLON CANCER. Mice, Inbred ICRC,Mice, ICR,Mouse, ICR,Mouse, Inbred ICR,Mouse, Inbred ICRC,ICR Mice,ICR Mice, Inbred,ICR Mouse,ICR Mouse, Inbred,ICRC Mice, Inbred,ICRC Mouse, Inbred,Inbred ICR Mice,Inbred ICR Mouse,Inbred ICRC Mice,Inbred ICRC Mouse
D011732 Pyridoxal Phosphate This is the active form of VITAMIN B 6 serving as a coenzyme for synthesis of amino acids, neurotransmitters (serotonin, norepinephrine), sphingolipids, aminolevulinic acid. During transamination of amino acids, pyridoxal phosphate is transiently converted into pyridoxamine phosphate (PYRIDOXAMINE). Pyridoxal 5-Phosphate,Pyridoxal-P,Phosphate, Pyridoxal,Pyridoxal 5 Phosphate,Pyridoxal P
D001921 Brain The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM. Encephalon
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001692 Biological Transport The movement of materials (including biochemical substances and drugs) through a biological system at the cellular level. The transport can be across cell membranes and epithelial layers. It also can occur within intracellular compartments and extracellular compartments. Transport, Biological,Biologic Transport,Transport, Biologic
D012978 Sodium Oxybate The sodium salt of 4-hydroxybutyric acid. It is used for both induction and maintenance of ANESTHESIA. 4-Hydroxybutyrate Sodium,Oxybate Sodium,Sodium Oxybutyrate,Sodium gamma-Hydroxybutyrate,gamma-Hydroxybutyrate,Somsanit,Xyrem,4 Hydroxybutyrate Sodium,Oxybate, Sodium,Oxybutyrate, Sodium,Sodium gamma Hydroxybutyrate,gamma Hydroxybutyrate
D051379 Mice The common name for the genus Mus. Mice, House,Mus,Mus musculus,Mice, Laboratory,Mouse,Mouse, House,Mouse, Laboratory,Mouse, Swiss,Mus domesticus,Mus musculus domesticus,Swiss Mice,House Mice,House Mouse,Laboratory Mice,Laboratory Mouse,Mice, Swiss,Swiss Mouse,domesticus, Mus musculus

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