THE MODIFIED IRWIN TEST: A COMPREHENSIVE NEUROBEHAVIORAL SCREENING TOOL FOR THE EVALUATION OF NEUROTOXICITY AND DRUG SAFETY

Vinay Kumar*, Amrit Paul, Diptendu Bhowmik, Dr. Jashabir Chakraborty

ABSTRACT

Neurotoxic assessment is one of the key links in safety evaluation concerning pharmaceuticals, chemicals and Toxic environmental polutants. Different neurobehavioral screening like the Modified Irwin test has emerged as the most widely-used and reliable approach vis-à-vis functional analyses of central, peripheral nervous systems in experimental rodents. This review is a comprehensive overview of the Modified Irwin test as a basic neurobehavioral assay to detect neurotoxicity. The development of the test and the development of its methodology based on the Functional Observation Battery (FOB). It’s use in a wide range of animal research including screening of the central nervous system (CNS), safety pharmacology evaluation, neurotoxicity and behavioral toxicity assessment, dose-response and time-course studies, regulatory toxicology, etc. Emphasis is placed on the ability of the Modified Irwin test to discover early functional disturbances which may be produced in the autonomic, neuromuscular, sensory and behavioral domains frequently faster than any structural neuropathological findings. Due to its noninvasiveness, adaptability, acceptance by regulatory authorities and efficiency, the Modified Irwin test continues to be a cornerstone of neurobehavioral screening tools in experimental rodent models--guiding further targeted neurotoxicological investigations, underpinning human risk assessment.

Keywords: Modified Irwin test; neurotoxicity; neurobehavioral assessment; Functional Observation Battery; safety pharmacology; experimental rodents.