Sodium channel in isolated human brain macrophages (microglia).

Abstract:

:Human brain macrophages (microglia) have been isolated from mixed brain cell cultures initiated from explants of neurosurgical adult human tissue in one step according to a method developed for rat microglia. Cells were characterized enzyme-histochemically (NDPase) in mixed and immunocytochemically (anti-CD 14) in mixed and isolated cultures. Purified cells were used to investigate in more detail membrane currents by the patch clamp technique. In 14 cells microdialyzed with a standard, K(+)-containing intracellular solution there was no indication for a hyperpolarization-induced K(+)-inward current characteristic for newborn rat microglia. However, in 12 cells depolarizing pulses initiated a rapidly inactivating inward current which was followed by an outward current (in 4 cells). The outward current appeared to be carried by K+, since it was absent in another 18 cells, recorded by micropipettes containing Cs+ instead of K+ as the main intracellular cation. The depolarization-induced inward current persisted under these conditions. This current was inhibited by tetrodotoxin (5 microM) and by substitution of Na+ by choline in the bath solution. It is suggested that this Na(+)-current is specifically expressed in macrophages derived from adult brain.

journal_name

Glia

journal_title

Glia

authors

Nörenberg W,Illes P,Gebicke-Haerter PJ

doi

10.1002/glia.440100303

subject

Has Abstract

pub_date

1994-03-01 00:00:00

pages

165-72

issue

3

eissn

0894-1491

issn

1098-1136

journal_volume

10

pub_type

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