Plasma Lipids and Apolipoproteins

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Questions and Answers

Which of the following is true about Apo-B48?

  • It is synthesized in the intestine (correct)
  • It is found in LDL and VLDL
  • It is an activator of LCAT enzyme
  • It is synthesized in the liver

What is the function of Apo-CII?

  • It is an activator of plasma lipoprotein lipase (correct)
  • It is found in VLDL, HDL, chylomicrons, and chylomicron remnants
  • It includes apo-AI and apo-AII
  • It is synthesized in the liver

What is the range of total plasma lipids after 12 hours fasting?

  • 200-500 mg/dl
  • 400-700 mg/dl (correct)
  • 600-900 mg/dl
  • 100-300 mg/dl

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Study Notes

  • Plasma lipids are measured after 12 hours fasting.
  • Total plasma lipids range from 400-700 mg/dl.
  • Apolipoprotein-A includes apo-AI and apo-AII.
  • Apo-AI in HDL is an activator of LCAT enzyme.
  • Apolipoprotein-B has two types: apo-B48 for chylomicrons and apo-B100 for LDL and VLDL.
  • Apo-B48 is synthesized in the intestine, and apo-B100 is synthesized in the liver.
  • Apolipoprotein-C includes apo-CI, apo-CII, and apo-CIII.
  • Apo-CII is transferred from HDL to chylomicrons and VLDL and is an activator of plasma lipoprotein lipase.
  • Apolipoprotein E is found in VLDL, HDL, chylomicrons, and chylomicron remnants.
  • Apo E accounts for 5-10% of total VLDL apolipoproteins in normal subjects.

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