Plasma proteins and lipoproteins (PPL)

Plasma proteins and lipoproteins represent a heterogeneous group of biochemical entities circulating in the blood that perform essential physiological roles, including the transport of lipids, hormones, and drugs, as well as maintaining oncotic pressure and immune defense. Plasma proteins like albumin and alpha-1-acid glycoprotein are critical determinants of drug pharmacokinetics, as their binding capacity dictates the free fraction of many therapeutic agents. Lipoproteins, including LDL, HDL, and VLDL, are central to the pathogenesis of atherosclerosis and cardiovascular disease, serving as primary targets for lipid-lowering therapies. While specific members of this group (e.g., Apolipoprotein B or Clotting Factor VIII) are distinct therapeutic targets, the collective term refers to a broad physiological category rather than a single molecular target. Consequently, pharmacological intervention typically focuses on modulating the concentration, function, or clearance of specific components within this group to treat metabolic, cardiovascular, and hematologic disorders.

Other names

Serum proteinsBlood proteinsPlasma lipoproteinsCirculating proteins

Drugs interact with these components by binding to transport sites (e.g., albumin binding), inhibiting synthesis (e.g., statins), or promoting clearance (e.g., PCSK9 inhibitors) to modulate lipid levels or drug distribution.