MARKERS OF NEUROTOXICITY - FROM BEHAVIOR TO AUTOANTIBODIES AGAINST BRAIN PROTEINS

Evidence of potentially neurotoxic exposures may be obtained in periph eral indicator media, but molecular or cellular evidence of neurotoxic effects has not been as readily available, primarily because the nerv ous system of living humans is beyond the reach of direct measures. Al though there is limited evidence that molecular changes in the blood c an provide information about neurotoxicity, several new approaches are being investigated. One is that the immune system may preserve eviden ce of damage to the nervous system. Debris from damaged cells in the n ervous system may present as antigens, giving rise to autointibodies, which may be detectable in blood for a long time after injury. Progres s will depend on more control experiments and clarification of confoun ding variables. Validation of new molecular markers must go hand in ha nd with documentation of impaired function, most commonly measured as behavioral or neurophysiological changes. These noninvasive markers wi ll be measured with greater sensitivity and precision, thanks to innov ative computer technology. The practical advantages of the new markers may be as important as their contribution to our understanding of the mechanisms by which the nervous system defends against chemical insul t.