Stimulation of amino acid uptake and Na+,K+-ATPase activity by norepinephrine in superior cervical sympathetic ganglia excised from adult rats

Effect of exogenous gangliosides on amino acid uptake and Na+, K+-ATPase activity in superior cervical and nodose ganglia of rats

The effects of some gangliosides on active uptake of nonmetabolizable alpha-aminoisobutyric acid (AIB) and Na+, K+-ATPase and Ca2+, Mg2+-ATPase activities in superior cervical ganglia (SCG) and nodose ganglia (NG) excised from adult rats were examined during aerobic incubation at 37 degrees C for 2 h. In NG, amino acid uptake was greatly accelerated with the addition of galactosyl-N-acetylgalactosaminyl-[N-acetylneuraminyl]-galactosylgluc osyl ceramide (GM1) (85%) and also with N-acetylgalactosaminyl-[N-acetylneuraminyl]-galactosylglucosyl ceramide (GM2) or [N-acetylneuraminyl]-galactosyl-N-acetylgalactosaminyl-[N-acetyl- neuraminyl]-galactosylglucosyl ceramide (GD1a) (43% each) compared with a nonaddition control at a 5 nM concentration. Under identical conditions, Na+, K+-ATPase activity was strongly stimulated with GM1 (180%) and GD1a (93%), whereas Ca2+, Mg2+-ATPase activity showed no change. In SCG, on the other hand, AIB uptake was apparently inhibited (-27%) by addition of GM1, with a slight decrease in Na+, K+-ATPase but no change in Ca2+, Mg2+-ATPase activity in the tissue. Both asialo-GM1, in which N-acetylneuraminic acid is deficient, and Forssman glycolipid, which is not present in nervous tissue, failed to produce any significant increase in both SCG and NG not only in amino acid uptake, but also in Na+, K+-ATPase activity. A kinetic study of active AIB uptake showed that GM1 ganglioside produced an increase in Km with no change in Vmax in SCG, whereas it caused a decrease in Km with a slight increase in Vmax in NG. Treatment of NG and SCG with neuraminidase from Vibrio cholerae, an enzyme that split off sialic acid from polysialoganglioside, leaving GM1 intact, caused little inhibition of the amino acid uptake.(ABSTRACT TRUNCATED AT 250 WORDS)

Stimulative effect of glia maturation factor and acetylcholine on active amino acid uptake and Ca2+,Mg2+-ATPase activity in nodose ganglia excised from adult rats

During aerobic incubation at 37 degrees C, active uptake of labeled non-metabolizable alpha-aminoisobutyric acid (AIB) into isolated nodose ganglia (NG) excised from adult rats was accelerated to nearly twice that of the control, by the addition of glia maturation factor (GMF, 5 micrograms/ml) in a dose-dependent manner. A similar but moderate stimulative effect on ganglionic AIB uptake was caused by the addition of acetylcholine (ACh, 1 mM) plus eserine (0.1 mM). This effect, however, was not antagonized by nicotinic (hexamethonium, C6, 0.1 mM) or muscarinic (atropine, 0.1 mM) blockers. The GMF-induced amino acid uptake seemed to be inhibited by further addition of ACh. On the other hand, ganglionic Ca2+,Mg2+-ATPase activity was greatly stimulated by either GMF or ACh. These results suggest that the increase in AIB uptake induced by GMF or ACh is possibly linked to Ca2+,Mg2+-ATPase activity in NG cell membranes.