Blood cholesterol levels are not consistently elevated in subjects with age-related cognitive decline, although epidemiological studies suggest that Alzheimer's disease and cardiovascular diseases share common risk factors. These include the presence of an unusual genetic variant, the APOE4 (apolipoprotein E4) allele, which modulates LDL (low-density lipoproteins) metabolism, increases free radical formation and reduces plasma antioxidant concentrations. Together, these risk factors support a mechanism for increased LDL circulation time and free radical modification of LDL. Plasma oxycholesterols, hydroxylated metabolites of cholesterol, are carried by oxidized LDL, and elevated lipids in mid-life are associated with increased long-term risk of dementia. Although brain cholesterol metabolism is segregated from the systemic circulation, during oxidative stress, plasma oxycholesterols could have damaging effects on BBB (blood–brain barrier) function and consequently on neuronal cells. Cholesterol-lowering drugs such as statins may prevent the modifications to LDL in mid-life and might show beneficial effects in later life.
Conference Article| August 11 2014
Hypercholesterolaemia-induced oxidative stress at the blood–brain barrier
Irundika H.K. Dias;
Maria C. Polidori;
Helen R. Griffiths
Helen R. Griffiths 1
*Life and Health Sciences and Aston Research Centre for Healthy Ageing, Aston University, Aston Triangle, Birmingham B4 7ET, U.K.
1To whom correspondence should be addressed (email@example.com).
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Irundika H.K. Dias, Maria C. Polidori, Helen R. Griffiths; Hypercholesterolaemia-induced oxidative stress at the blood–brain barrier. Biochem Soc Trans 1 August 2014; 42 (4): 1001–1005. doi: https://doi.org/10.1042/BST20140164
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