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Super-sticky 'ultra-bad' cholesterol revealed in people at high risk of heart disease
Date:5/26/2011

Scientists from the University of Warwick have discovered why a newly found form of cholesterol seems to be 'ultra-bad', leading to increased risk of heart disease. The discovery could lead to new treatments to prevent heart disease particularly in people with type 2 diabetes and the elderly.

The research, funded by the British Heart Foundation (BHF), found that 'ultrabad' cholesterol, called MGmin-low-density lipoprotein (LDL), which is more common in people with type 2 diabetes and the elderly, appears to be 'stickier' than normal LDL. This makes it more likely to attach to the walls of arteries. When LDL attaches to artery walls it helps form the dangerous 'fatty' plaques' that cause coronary heart disease (CHD).

CHD is the condition behind heart attacks, claiming 88,000 lives in the UK every year (1).

The researchers made the discovery by creating human MGmin-LDL in the laboratory, then studying its characteristics and interactions with other important molecules in the body.

They found that MGmin-LDL is created by the addition of sugar groups to 'normal' LDL a process called glycation making LDL smaller and denser. By changing its shape, the sugar groups expose new regions on the surface of the LDL. These exposed regions are more likely to stick to artery walls, helping to build fatty plaques. As fatty plaques grow they narrow arteries - reducing blood flow - and they can eventually rupture, triggering a blood clot that causes a heart attack or stroke.

The discovery might also explain why metformin, a widely prescribed type 2 diabetes drug, seems to lead to reduced heart disease risk. Metformin is known to lower blood sugar levels, and this new research shows it may reduce the risk of CHD by blocking the transformation of normal LDL to the more 'sticky' MGmin-LDL.

Dr Naila Rabbani, Associate Professor of Experimental Systems Biology at Warwick Medical School, who led the study, said:

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Contact: Kate Cox
kate.cox@warwick.ac.uk
44-024-765-74255
University of Warwick
Source:Eurekalert

Page: 1 2

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