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[摘要]：Neuromelanin (NM) isolated from seven regions of the human brain is found to contain series of natural and oxidized isoprenoid lipids. Specifically, dolichols (dol) and dolichoic acids (dol-CA) with 14-22 and 14-21 isoprene units are identified. Standards of nor-dolichol and nor-dolichoic acid were used to determine the relative amounts of dol and dol-CA compared to the total lipids present in NM for each region. The cerebellum, putamen, globus pallidus, and premotor cortex contained similar amounts of dol, comprising approximately 8 95% of the total lipid weight. Interestingly, the corpus callosum contains substantially lower quantities of both dol and dol-CA compared to the other regions-less than 4% dol relative to the total lipid weight. Oxidized and reduced dolichol-related species were identified and determined to be region-dependent. (C) 2009 Elseiver Inc. All rights reserved. |
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