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Supplement

Insights into Apolipoprotein B Biology from Transgenic and Gene-Targeted Mice

^a Gladstone Institute of Cardiovascular Disease and ^b Cardiovascular Research Institute, ^c Department of Medicine, University of California, San Francisco, CA 94141–9100

Over the past five years, several laboratories have used transgenic and gene-targeted mice to study apolipoprotein (apo) B biology. Genetically modified mice have proven useful for investigating the genetic and environmental factors affecting atherogenesis, for defining apoB structure/function relationships, for understanding the regulation of the apoB gene expression in the intestine, for defining the "physiologic rationale" for the existence of the two different forms of apoB (apoB48 and apoB100) in mammalian metabolism and for providing mechanistic insights into the human apoB deficiency syndrome, familial hypobetalipoproteinemia. This review will provide several examples of how genetically modified mice have contributed to our understanding of apoB biology, including our new discovery that human heart myocytes secrete nascent apoB-containing lipoproteins.

KEY WORDS: • protein structure/function • yolk sac endoderm • heart • hypobetalipoproteinemia • metabolism