Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2007 Jul;454(4):559-63.
doi: 10.1007/s00424-007-0232-4. Epub 2007 Feb 23.

TRAM-34 inhibits nonselective cation channels

Affiliations

TRAM-34 inhibits nonselective cation channels

Tom Schilling et al. Pflugers Arch. 2007 Jul.

Abstract

TRAM-34 has been demonstrated to inhibit intermediate-conductance Ca(2+)-activated K(+) channels in a wide variety of cell types, including immune cells. In the present study, we investigated effects of TRAM-34 on microglial cells stimulated with lysophosphatidylcholine (LPC). LPC-induced increases in the intracellular Ca(2+) concentration of microglial cells were effectively reduced in the presence of TRAM-34. At a concentration of 1 microM, TRAM-34 inhibited LPC-induced Ca(2+) signals by 60%. The TRAM-34-induced reduction of LPC-induced Ca(2+) increases cannot be related to the inhibition of Ca(2+)-activated K(+) channels. In contrast to TRAM-34, the Ca(2+)-activated K(+) channel inhibitor charybdotoxin did not affect LPC-induced increases in the intracellular Ca(2+) concentration of microglial cells. Patch clamp experiments revealed a direct inhibitory effect of TRAM-34 on nonselective cation channels. Half-maximal inhibition of LPC-induced nonselective cation currents was determined at 38 nM TRAM-34. These data indicate that TRAM-34 may cause additional effects on immune cells that are unrelated to the well-described inhibition of Ca(2+)-activated K(+) channels.

PubMed Disclaimer

References

    1. Neuropharmacology. 2004 Sep;47(3):450-60 - PubMed
    1. J Immunol. 2004 Jul 15;173(2):776-86 - PubMed
    1. Pflugers Arch. 2005 Oct;451(1):235-42 - PubMed
    1. Naunyn Schmiedebergs Arch Pharmacol. 2004 Oct;370(4):227-37 - PubMed
    1. Proc Natl Acad Sci U S A. 2001 Nov 20;98(24):13942-7 - PubMed

Publication types

MeSH terms

LinkOut - more resources