Lipoproteins
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Lipoproteins. What are lipoproteins?. Lipoproteins are molecules produced in the body and act as lipid transporters They consist of: Triglycerides Protein Phospholipids Free cholesterol. There are four types of lipoproteins: Chylomicrons LDL VLDL HDL. Chylomicrons.

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Lipoproteins

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Lipoproteins

Lipoproteins


What are lipoproteins

What are lipoproteins?

  • Lipoproteins are molecules produced in the body and act as lipid transporters

  • They consist of:

    • Triglycerides

    • Protein

    • Phospholipids

    • Free cholesterol


Lipoproteins

  • There are four types of lipoproteins:

    • Chylomicrons

    • LDL

    • VLDL

    • HDL


Chylomicrons

Chylomicrons

  • Carry fat from the intestine to the liver

  • Along the way it drops off fat in adipose tissue (for storage)

  • Only present in blood 2 -10 hours after a meal


Lipoproteins

VLDL

  • Stands for very low density lipoprotein

  • Lipids made in the liver, or those collected from chylomicron remnants are packaged into VLDL and then transported to other parts of the body


Lipoproteins

  • As the VLDL moves through the body, cells remove triglycerides causing the VLDL to shrink. This causes the VLDL to become more dense, as it loses fat.


Lipoproteins

LDL

  • VLDL’s lose so much fat that they eventually become LDL’s

  • Low Density Lipoproteins

  • LDL’s are cholesterol rich

  • Circulates through the body to be taken up

  • It will return to the liver, however if it is not needed, then LDL will remain in the blood


Lipoproteins

HDL

  • High density lipoprotein

  • Made in liver to collect extra and unwanted cholesterol


Why do you need to worry about ldl and hdl

Why do you need to worry about LDL and HDL?

  • High HDL represents cholesterol returning to the liver

  • High LDL is associated with heart disease, heart attack

  • Remember that HDL and LDL are the same, the only difference is the proportions of lipids to proteins in each


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