Lipoprotein involved in reverse cholesterol transport-
**Core Concept**
The reverse cholesterol transport pathway is a vital mechanism for eliminating excess cholesterol from peripheral tissues and returning it to the liver for excretion. This process involves the action of specific lipoproteins that facilitate the transfer of cholesterol from peripheral cells to the liver.
**Why the Correct Answer is Right**
High-density lipoprotein (HDL) is the primary lipoprotein involved in reverse cholesterol transport. HDL particles, also known as "good cholesterol," collect excess cholesterol from peripheral cells and transport it to the liver via the action of the enzyme cholesterol ester transfer protein (CETP). This process involves the exchange of cholesterol esters for triglycerides between HDL and very-low-density lipoprotein (VLDL) particles. In the liver, the cholesterol is then excreted into the bile and ultimately eliminated from the body.
**Why Each Wrong Option is Incorrect**
**Option A:** VLDL is involved in the transport of endogenous triglycerides from the liver to peripheral tissues, but it is not primarily responsible for reverse cholesterol transport.
**Option B:** LDL (low-density lipoprotein), often referred to as "bad cholesterol," is involved in the transport of cholesterol to peripheral tissues, not the reverse process.
**Option C:** Chylomicrons are large lipoproteins that transport dietary triglycerides from the intestine to peripheral tissues, but they are not directly involved in reverse cholesterol transport.
**Clinical Pearl / High-Yield Fact**
The level of HDL cholesterol is inversely correlated with the risk of cardiovascular disease, making it an important parameter in assessing cardiovascular risk.
**Correct Answer: C. HDL (High-density lipoprotein)**