Ho Y K, Brown M S, Kayden H J, Goldstein J L
J Exp Med. 1976 Aug 1;144(2):444-55. doi: 10.1084/jem.144.2.444.
Long-term established human lymphoid cells were shown to possess high affinity cell surface receptors for low density lipoprotein (LDL), the major cholesterol-carrying protein in human plasma. Binding of LDL to these receptors was followed by internalization of the lipoprotein and hydrolysis of its protein and cholesteryl ester components. Cultured lymphocytes from a patient with the homozygous form of familial hypercholesterolemia lacked cell surface LDL receptors and therefore failed to take up and degrade the lipoprotein with high affinity. Cultured human lymphocytes should prove useful for further studies of: (a) the relation between cholesterol metabolism and cellular function and (b) the mechanism by which LDL binding at the cell surface leads to internalization of the lipoprotein.
长期建立的人类淋巴细胞被证明具有对低密度脂蛋白(LDL)的高亲和力细胞表面受体,LDL是人类血浆中主要的携带胆固醇的蛋白质。LDL与这些受体结合后,脂蛋白会被内化,其蛋白质和胆固醇酯成分会被水解。来自纯合子家族性高胆固醇血症患者的培养淋巴细胞缺乏细胞表面LDL受体,因此无法以高亲和力摄取和降解脂蛋白。培养的人类淋巴细胞应被证明对以下进一步研究有用:(a)胆固醇代谢与细胞功能之间的关系;(b)细胞表面LDL结合导致脂蛋白内化的机制。