Statins: Protection Against Heart Attacks and Strokes—Hallelujah!
Cholesterol! This may be the single most famous (or infamous) small molecule of life. Most people view it as a threat to good health and even to life itself. We search for foods that are cholesterol free or at least low in cholesterol. We use them in efforts to achieve a low-cholesterol diet. Our primary care physicians measure our blood cholesterol levels routinely and report the news, good and bad. If the level is high, they recommend a better diet (that is, one lower in cholesterol and saturated fat), more exercise, and perhaps weight reduction. If those measures fail to get the cholesterol level where it should be, it is highly likely that therapy with a cholesterol-lowering drug will be recommended. The drug will usually fall into a class known as statins. Statins are among the most frequently prescribed drugs in the world. The first statin approved for marketing by the FDA in the United States was lovastatin (Mevacor), which happened in 1987. Lovastatin was followed into clinical practice by pravastatin (Pravachol), simvastatin (Zocor), fluvastatin (Lescol), atorvastatin (Lipitor), cerivastatin (Baychol), pitivastatin (Livalo), and rosuvastatin (Crestor). There are a lot of options from which to choose among the statins. The story of how statins were discovered and developed is pretty amazing. The tale focuses on cholesterol in its several dimensions—what it is, how it is made, how its levels are regulated, the health consequences that may ensue when proper regulation fails, and how statins act to restore that regulation. The task of this chapter is to tell the tale. The focal point is cholesterol. So that is where we begin. There are two sides to most stories, which is certainly the case for cholesterol. Although what we hear about cholesterol is mostly negative (isn’t there some way to get rid of this stuff?), the fact is, we cannot live without it and there are three reasons why. First, cholesterol is an essential component of all our membranes.