当前位置： SCI文献检索 > NEUROSCIENCE期刊下所有文献 > The organochlorine pesticides gamma-hexachlorocyclohexane (lindane), alpha-endosulfan and dieldrin differentially interact with GABA(A) and glycine-gated chloride channels in primary cultures of cerebellar granule cells.

The organochlorine pesticides gamma-hexachlorocyclohexane (lindane), alpha-endosulfan and dieldrin differentially interact with GABA(A) and glycine-gated chloride channels in primary cultures of cerebellar granule cells.

Abstract：

:The neurotoxic organochlorine pesticides gamma-hexachlorocyclohexane, alpha-endosulfan and dieldrin induce in mammals a hyperexcitability syndrome accompanied by convulsions. They reduce the GABA-induced Cl(-) flux. The strychnine-sensitive glycine receptor also regulates Cl(-)-flux inhibitory responses. We studied the effects of these compounds on Cl(-) channels associated with glycine receptors in cultured cerebellar granule cells in comparison to the GABA(A) receptor. Both GABA (EC(50): 5 microM) and glycine (EC(50): 68 microM) increased (36)Cl(-) influx. This increase was antagonized by bicuculline and strychnine, respectively. Lindane inhibited with similar potency both GABA(A) (IC(50): 6.1 microM) and glycine (5.0 microM) receptors. alpha-Endosulfan and dieldrin inhibited the GABA(A) receptor (IC(50) values: 0.4 microM and 0.2 microM, respectively) more potently than the glycine receptor (IC(50) values: 3.5 microM and 3 microM, respectively). Picrotoxinin also inhibited the glycine receptor, although with low potency (IC(50)>100 microM). A 3D pharmacophore model, consisting of five hydrophobic regions and one hydrogen bond acceptor site in a specific three-dimensional arrangement, was developed for these compounds by computational modelling. We propose that the hydrogen bond acceptor moiety and the hydrophobic region were responsible for the affinity of these compounds at the GABA(A) receptor whereas only the hydrophobic region of the molecules was responsible for their interaction with the glycine receptors. In summary, these compounds could produce neuronal hyperexcitability by blocking glycine receptors besides the GABA(A) receptor. We propose that two zones of the polychlorocycloalkane pesticide molecules (a lipophilic zone and a polar zone) differentially contribute to their binding to GABA(A) and glycine receptors.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Vale C,Fonfría E,Bujons J,Messeguer A,Rodríguez-Farré E,Suñol C

doi

10.1016/s0306-4522(02)00875-8

keywords:

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

397-403

issue

2

eissn

0306-4522

issn

1873-7544

pii

S0306452202008758

journal_volume

117

pub_type

杂志文章

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