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Rabbit serum hypertriglyceridemia after administration of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD).

TCDD (2,3,7,8-tetrachlorodibenzo-p-dioxin) caused a dose-dependent decrease of adipose tissue lipoprotein lipase (LPL) activity and caused a concomitant increase in serum triglyceride concentration in the rabbit 10 d after single ip administration of either 1 or 50 micrograms/kg. Hepatic low-density lipoprotein (LDL) binding was markedly depressed and serum cholesterol concentrations were modestly increased relative to pair-fed control animals. Serum glucose concentrations were significantly lower in the rabbit administered TCDD compared to ad libitum or pair-fed control animals, although little change was observed in serum insulin concentration. Electron microscopic examination of aortic arches 20 d after a single ip administration of 50 micrograms TCDD/kg revealed ruffling, denudation, and sloughing off of the cell surface and the appearance of macrophage-like structures in the intima and media of the endothelial cells. These alterations resemble preatherosclerotic lesions typical in animals with hyperlipidemia. It is proposed that TCDD causes hyperlipidemia in the rabbit through suppression of LPL activity and LDL receptor binding.