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Clinical, biochemical, electrophysiologic, and histologic assessment of chlorpyrifos induced delayed neuropathy in the cat.

Abstract：

:The ability of a supralethal dose of chlorpyrifos to produce delayed neuropathy was examined using assessments of clinical signs, electromyography (EMG), motor nerve conduction velocity (MNCV), lymphocyte neuropathy target esterase activity (LNTE), and histologic changes in nervous system tissues. Cats were exposed to a single, im injection of corn oil (vehicle control), DFP (positive control) at 5.0 mg/kg, or chlorpyrifos at 300 mg/kg and observed for 60 days. Atropine and 2-PAM were administered to chlorpyrifos exposed cats one to two times a day for 14 to 24 days in response to the appearance of cholinergic signs. Anorectic cats during the acute toxicosis were force fed by hand and hydration was maintained by administering fluids sc. Onset of ataxia (mean +/- SD) for the positive control and chlorpyrifos exposed cats were 16.2 +/- 1.8 days (range of 14-19 days) and 19.0 +/- 1.4 days (range of 17-21 days), respectively. Functional deficits for both groups were confined to the hindlimbs and characterized by a crouched-waddling gait, hypermetria, and proprioceptive deficits. Maximal inhibition of LNTE activity was 96% at 24 hr postdosing in the positive control group and 46% at 7 days postdosing in the chlorpyrifos group. No EMG or MNCV abnormalities were detected in any of the treatment groups. Axonal degeneration was similar for the positive control and chlorpyrifos exposed cats. Ascending tracts of the cervical spinal cord and descending tracts of the thoracic and lumbar spinal cord were most severely affected and peripheral nerves were only mildly affected. The clinical and histologic effects produced indicate that chlorpyrifos can cause delayed neuropathy in the domestic cat. The moderate but prolonged inhibition of LNTE produced by chlorpyrifos is atypical of classic organophosphorus delayed neurotoxicants.

journal_name

Neurotoxicology

journal_title

Neurotoxicology

authors

Fikes JD,Zachary JF,Parker AJ,Beasley VR

subject

Has Abstract

pub_date

1992-10-01 00:00:00

pages

663-78

issue

3

eissn

0161-813X

issn

1872-9711

journal_volume

13

pub_type

杂志文章

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