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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Prevention of diisopropylphosphorofluoridate (DFP)-induced skeletal muscle fiber lesions in rat.

The objective of the present investigation was to assess the comparative efficacy of prophylactic treatment with d-tubocurarine (d-TC) (0.075 mg/kg), atropine sulfate (16 mg/kg), and atropine methylnitrate (16 mg/kg), employed singly or in combination against the diisopropylphosphorofluoridate (DFP)-induced myopathy in rat. DFP (1.5 mg/kg, s.c.) produced signs of cholinergic toxicity with predominantly peripheral involvement manifest as severe muscle fasciculations beginning within 5-7 min and persisting in excess of 4-6 h. Maximal muscle fiber necrosis was observed within 24 h. Rats were protected against the apparent behavioural and morphological changes as well as electrophysiological signs of neuromuscular toxicity by all pretreatment agents. Combined pretreatment with d-TC (0.075 mg/kg, s.c.) and atropine methylnitrate (16 mg/kg, s.c.) was found to be most effective in attenuating DFP-induced muscle fiber necrosis as evidenced by complete absence of lesions and the prevention of DFP-induced hyperactivity in nerve and muscle. Significant protection was afforded by all pretreatment agents when given alone. It is suggested that the pretreatment agents act presynaptically by preventing drug-induced backfiring and muscle fasciculations possibly by reducing the release of acetylcholine (ACh). The protective drugs in the concentrations used had no significant effect on the normal characteristics of conduction and transmission.[1]


  1. Prevention of diisopropylphosphorofluoridate (DFP)-induced skeletal muscle fiber lesions in rat. Patterson, G.T., Gupta, R.C., Misulis, K.E., Dettbarn, W.D. Toxicology (1988) [Pubmed]
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