Methylmercury modulates GABAA receptor complex differentially in rat cortical and cerebellar membranes in vitro.

Abstract:

:Effects of methylmercury (MetHg) on the specific [3H]flunitrazepam binding were studied in rat cortical and cerebellar P2-fractions in vitro. MetHg did not affect significantly the specific [3H]flunitrazepam binding in unwashed P2-fraction but increased it marginally (by 16%) at 100 microM in washed P2-fraction, in both brain regions. Muscimol (3 microM), a GABAA agonist, stimulated the [3H]flunitrazepam binding by 30% to 50% depending on the brain region. In washed cerebellar membranes the enhancing response of muscimol was 10 to 14% lower after preincubation of the tissue with MetHg but in cerebral cortex MetHg did not modulate the muscimol response at all. The results indicate that Met-Hg may have region specific effects on GABAA receptors in vitro and the effect may depend on the occupational state of the GABA binding domain of the receptor complex.

journal_name

Neurochem Res

journal_title

Neurochemical research

authors

Komulainen H,Keränen A,Saano V

doi

10.1007/BF01705532

subject

Has Abstract

pub_date

1995-06-01 00:00:00

pages

659-62

issue

6

eissn

0364-3190

issn

1573-6903

journal_volume

20

pub_type

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