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- W2023703760 abstract "Biochemical events in the initiation of organophosphorus induced delayed neurotoxicity (OPIDN) are not well understood. To find new putative target(s) for OPIDN, we investigated the biochemical and pharmacological characteristics of [3H] diisopropyl phosphorofluoridate (DFP) binding to membrane and cytosol preparations from the brain and spinal cord of hens in vitro. [3H]DFP binding to both preparations was determined by the specific binding obtained by subtracting non-specific binding from total binding. The specific binding sites of [3H]DFP were found not only on membrane but also in cytosol. Kd values were higher and Bmax values were lower in cytosol than in membrane. Moreover, the Kd values in both membrane and cytosol preparations from spinal cord were lower than those of brain. The Bmax values in membrane and cytosol were similar between brain and spinal cord. The specific binding to both preparations was markedly displaced by unlabeled DFP. The specific binding of DFP to the membrane was highly or partly displaced by organophosphorus compounds (OPs) or a carbamate, respectively. However, both the OPs and the carbamate had considerably weaker blocking effects on the specific binding of DFP to cytosol. None of the compounds known to interact with neuropathy target esterase (NTE) had a strong blocking effect on the specific binding of DFP to either membrane or cytosol. These results show that the specific binding of DFP to the membrane may be binding with cholinesterase (ChE). However, cytosol, especially in spinal cord, may have DFP binding sites other than ChE and NTE." @default.
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- W2023703760 date "2001-04-01" @default.
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- W2023703760 title "A Comparative Study of Binding Sites for Diisopropyl Phosphorofluoridate in Membrane and Cytosol Preparations from Spinal Cord and Brain of Hens" @default.
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- W2023703760 doi "https://doi.org/10.1016/s0161-813x(00)00013-9" @default.
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