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Monosodium glutamate (MSG) is widely used as a flavor enhancer. Melatonin and garlic are well known as antioxidant. The present study was performed to evaluate the microscopic changes in the cerebellar cortex of rats after the administration of MSG and the possible protective effect of melatonin versus garlic on those changes. The rats were divided into four main groups. Group I (control group). Group II received MSG (4 mg/ g/day). Group III received MSG+ melatonin (10 mg/kg bw/day). Group IV received MSG+garlic (300 mg/kg bw/day). Immunohistochemical staining for glial fibrillary acidic protein (GFAP) was done as a marker for astrocyte demonstration. Morphometric study was done to assess the mean number and diameter of Purkinje cells, the number of astrocytes and the percentage area of positive GFAP immune stain. MSG group demonstrated congested blood vessels, vacuolations in the molecular layer, and Purkinje cells appeared irregular with nuclear degeneration. Granule cells appeared shrunken with darkly stained nuclei. The immunohistochemical stain for GFAP was less than expected in the three layers of the cerebellar cortex. Purkinje cells and granule cells appeared irregular in shape with dark small heterochromatic nuclei. The myelinated nerve fibers showed splitting and loss of the lamellar structure of their myelin sheath. Melatonin group showed that the cerebellar cortex was nearly similar to that of control group. Garlic treated group showed partial improvement. In conclusion, melatonin and garlic could partially protect against MSG induced changes and the protective effect of melatonin was better than garlic.

ultrastructural pathology

The possible protective role of melatonin versus garlic on monosodium Glutamate-induced changes in rat cerebellar cortex: histological, immunohistochemical and electron microscope study