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Organophosphate polyneuropathy: pathogenesis and prevention
Abstract:
Organophosphorus-induced delayed polyneuropathy (OPIDP) is initiated by the phosphorylation of a protein neurotoxic esterase (NTE) in the nervous system. A second step, the "aging" of the phosphoryl-enzyme complex, is required to produce the toxic effect. The experimental evidence for this molecular target and the importance of the aging process are reviewed. The catalytic activity of NTE has been used to develop an in vitro screening test that may distinguish the organophosphorus compounds (OPs) that cause neuropathy from those that do not, thereby providing a means for prevention of OPIDP. Moreover, a biochemical screening test, the determination of NTE activity in blood lymphocytes, may predict the development of OPIDP after acute or chronic exposure to OPs, and requires evaluation by carefully designed studies of occupational exposure to OPs.
Insights
Organophosphorus-induced delayed polyneuropathy (OPIDP) results from neurotoxic esterase (NTE) phosphorylation and aging. NTE activity screening can prevent OPIDP and predict neuropathy risk from organophosphorus compound exposure.
Area of Science:
- Neurotoxicology
- Biochemistry
- Occupational Health
Background:
- Organophosphorus-induced delayed polyneuropathy (OPIDP) is a neurotoxic effect caused by organophosphorus compounds (OPs).
- The mechanism involves the phosphorylation of neurotoxic esterase (NTE) followed by an 'aging' process of the enzyme-inhibitor complex.
- This aging step is critical for the development of OPIDP.
Purpose of the Study:
- To review the experimental evidence supporting NTE as the molecular target for OPIDP.
- To highlight the significance of the enzyme aging process in OPIDP.
- To discuss the utility of NTE-based screening tests for OPIDP prevention and risk assessment.
Main Methods:
- Review of existing experimental data on OPIDP and NTE.
- Description of an in vitro screening assay utilizing NTE catalytic activity.
- Discussion of a biochemical screening test measuring NTE activity in blood lymphocytes.
Main Results:
- NTE phosphorylation and subsequent aging are essential steps in OPIDP.
- An in vitro NTE activity assay can differentiate neuropathic from non-neuropathic OPs.
- Reduced NTE activity in lymphocytes may indicate susceptibility to OPIDP.
Conclusions:
- NTE is the validated molecular target for OPIDP.
- NTE-based screening tests offer potential for preventing OPIDP.
- Lymphocyte NTE activity assays require further validation in occupational settings to predict OPIDP risk.