Sökning: L773:1879 0712 OR L773:0014 2999 >
Mechanisms of bupiv...
Mechanisms of bupivacaine action on Na+ and K+ channels in myelinated axons of Xenopus laevis
-
- Nilsson, J (författare)
- Karolinska Institute
-
- Elinder, Fredrik (författare)
- Karolinska Institute
-
- Arhem, P (författare)
- Karolinska Institute
-
(creator_code:org_t)
- Elsevier Science B.V., Amsterdam. 1998
- 1998
- Engelska.
-
Ingår i: European Journal of Pharmacology. - : Elsevier Science B.V., Amsterdam.. - 0014-2999 .- 1879-0712. ; 360:1, s. 21-29
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- The local anaesthetic bupivacaine has recently been proposed to inhibit Na+ channels indirectly by making the resting potential less negative. To test this hypothesis we analysed the effects of bupivacaine on voltage and current clamped nodes of Ranvier. Contrary to the hypothesis, the leak current and the resting potential were unaffected. The Na+ and K+ channels were, however, affected at relatively low concentrations (33 mu M). Steady-state activation curves were decreased without notable shift effects, whereas the Naf inactivation curve was decreased and shifted in negative direction. The effect on the Na+ current was tentatively explained by a single-site, state-dependent binding model (K-d = 44 mu M), while that on the K+ current was explained by two population-specific mechanisms, one open-state dependent (K-d = 550 mu M) and one state independent (K-d = 59 mu M). The binding stoichiometry was higher than 1:1 for the main sites of action. In conclusion, bupivacaine exerts its main anaesthetic action on myelinated nerve axons by a direct modification of Na+ channels.
Nyckelord
- MEDICINE
- MEDICIN
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas