Abstract
Apolipoprotein E (apoE) is involved in hepatic disposition of chylomicron remnants, which is impaired in old age. Isoforms of apoE have been implicated in age-related diseases and possibly the aging process itself. Because the effects of old age on expression and distribution of apoE in the liver have not been reported, we studied the effect of old age on the immunohistochemistry of apoE in the livers of humans and the non-human primate, Papio hamadryas. Overall, old age was not associated with marked changes in the expression of apoE between adult (48±19 years) and old (82±5 years) humans. However, there was a change in the distribution of apoE staining. The livers of older humans displayed increased hepatocyte cytoplasmic staining and reduced peri-sinusoidal staining. Similar trends were noted in the livers from the baboons. Such findings are suggestive of altered apoE recycling in old age and have implications for age-related dyslipidaemia.
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