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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Evaluation of endomorphin-1 on the activity of Na(+),K(+)-ATPase using in vitro and in vivo studies.

The goal of this study was to investigate the effects of endomorphin-1 on Na(+),K(+)-ATPase activity in mouse brain synaptosome in vitro, and its antinociceptive interaction with the Na(+),K(+)-ATPase inhibitor ouabain. Endomorphin-1 (0.1 nM-10 microM) produced a concentration-dependent (EC(50): 43.19 nM, CI: 23.38-65.71 nM, E(max): 25.86%, CI: 24.53-27.20%), naloxone-reversible increase of the synaptosomal Na(+),K(+)-ATPase activity. The intrathecally (i.t.) administered endomorphin-1 (2-20 microg) produced a dose-dependent short-lasting increase in the tail-flick latency. Ouabain itself (1-1000 ng, i.t.) did not cause antinociception. Treatment with 10 ng ouabain significantly decreased the antinociceptive effect of 2 microg endomorphin-1, but none of the other combinations did significantly differ from the endomorhin-1-treated groups. These data indicate that endomorphin-1 increases the activity of Na(+),K(+)-ATPase in vitro but this effect may play a weak role in the antinociception induced by intrathecal endomorphin-1.[1]

References

  1. Evaluation of endomorphin-1 on the activity of Na(+),K(+)-ATPase using in vitro and in vivo studies. Horvath, G., Agil, A., Joo, G., Dobos, I., Benedek, G., Baeyens, J.M. Eur. J. Pharmacol. (2003) [Pubmed]
 
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