A glial toxin reduces effects of gold thioglucose on the hypothalamus and area postrema

To see if DL-alpha amino adipate (DL-AA) an agent known to cause transient swelling and dysfunction of hypothalamic glia, would affect the ability of goldthioglucose (GTG) to cause hypothalamic lesions, groups of male, 100 g rats were given saline, 0.5 mg/g of DL-AA, or 0.75 mg/g of DL-AA 30 min before injection of 0.4 mg/g of GTG. The incidence of GTG lesions was significantly less in the DL-AA treated groups than in the saline treated group. Histochemical staining of brain tissue revealed the existence of a population of specialized iron-containing glia with an anatomical distribution similar to the specific areas in the hypothalamus area postrema most sensitive to GTG. The results suggest that GTG lesion formation may result from an effect of GTG on glia.