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| Low-density Lipoproteins (LDL) is a cholesteryl [[Ester|ester]] which is the form in which [[Cholesterol|cholesterol]] is transported in [[Blood|blood]]<ref>Alberts B., Johnson A., Lewis J., Raff M., Roberts K and Watson J. (2007)</ref><ref>Molecular Biology of the Cell; 5th Edition, Garland Publishing</ref>.
| | See [[LDL|LDL]] |
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| These lipoproteins serve as useful molecules for maintaining the blood composition of cholesterol, keeping it within normal range as high cholesterol levels can lead to blood vessels being blocked and result in atherosclerotic plaque which can lead to strokes.
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| LDL maintain blood cholesterol level by binding with LDL receptors on cell surface membranes which can then be internalized into the cell by [[Receptor-mediated endocytosis|Receptor Mediated Endocytosis]].
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| The process of Import:
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| #LDL receptors are expressed on the surface of cell membrane.
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| #Internal signals within cell cause production of [[Clathirin coated pits|clathirin coated pits]], which internalize LDL receptors along with any LDL molecules that have bound to them.
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| #Clatherin coated pits shed their coat and deliver their contents to [[Early Endosome|Early Endosome]]. Low pH in endosomes results in LDL molecules being released from their receptors and passed onto Lysosomes.
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| #LDL receptors are recycled back to cell surface membrane to be reused whilst discharged LDL molecules remain in the lysosome.
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| #Cholestryl Esters in LDL are hydrolysed to free cholesterol molecules which can then be used by the cell in other biochemical reaction, such as the formation of cell membrane for example.
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| === References ===
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| <references />
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Latest revision as of 11:29, 24 October 2018