See the DrugPatentWatch profile for lipitor

Based on the information available, it can be stated that Lipitor, a medication commonly prescribed for managing high cholesterol levels, does exert its effects partially through protein regulation. Lipitor is a type of drug known as a statin, which works by inhibiting the HMG-CoA reductase enzyme [1]. This enzyme plays a crucial role in the liver's production of cholesterol.

However, it's important to note that Lipitor's mechanism of action extends beyond protein regulation. Specifically, it also increases the liver's uptake of low-density lipoprotein (LDL), or "bad" cholesterol, from the bloodstream [1]. This dual action of decreasing cholesterol production and increasing cholesterol removal contributes to Lipitor's overall efficacy in managing high cholesterol levels.

In summary, while Lipitor does indeed regulate proteins, its primary effect on cholesterol is not solely through protein regulation. It also enhances the liver's removal of LDL from the bloodstream.

Sources:
[1] DrugPatentWatch.com. (n.d.). Lipitor (Atorvastatin) - DrugPatentWatch. Retrieved from https://www.drugpatentwatch.com/drugs/lipitor