血液中胆固醇含量的多少由什么确定?饮食可使含量发生变化,但细胞和细胞携带的基因是关键的介质,因为细胞表面上的受体能与携带胆固醇的蛋白结合并将此蛋白从血液中除去。美国得克萨斯大学的研究人员已证明,如果一个细胞多于一种特殊受体,此细胞就能将血中它的配体清除,这种配体是与受体特异性结合的物质。达拉斯的研究人员Sandra Hofmann等通过基因工程使小鼠携带外来基因,然后用“转移基因”的小鼠证明了上述情况。他们在实验室用人低密度脂蛋 What determines the amount of cholesterol in the blood? Diet can make changes in content, but cells and cell-borne genes are the key mediators because the cell surface receptors can bind cholesterol-carrying proteins and the protein from the blood Remove. Researchers at the University of Texas in the United States have demonstrated that if a cell has more than one particular receptor, the cell clears its ligand in the blood, a substance that specifically binds to the receptor. Sandra Hofmann, a Dallas-based researcher, genetically engineered mice to carry foreign genes and then demonstrated the above with “transgenic” mice. They use low-density lipids in the lab