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[Hepatic triglyceride lipase].

G Simard¹, B Perret

¹Laboratoire de Biochimie Médicale, CHU, Angers.

Annales De Biologie Clinique

|January 1, 1990

Summary

This summary is machine-generated.

Hepatic triglyceride lipase (H-TGL) is a key enzyme in lipid metabolism, synthesized by hepatocytes and found on liver endothelium. Its exact function remains under investigation, but it may aid in clearing lipoprotein remnants and breaking down HDL.

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Area of Science:

Biochemistry
Enzymology
Lipid Metabolism

Background:

Post-heparin plasma contains two lipolytic enzymes.
Hepatic triglyceride lipase (H-TGL) is less understood than lipoprotein lipase.
H-TGL shares some properties with lipoprotein lipase, such as being a glycoprotein with optimal activity at pH 8-9.

Purpose of the Study:

To review the properties and potential functions of hepatic triglyceride lipase (H-TGL).
To highlight the characteristics of H-TGL that differentiate it from other lipolytic enzymes.

Main Methods:

Literature review of existing studies on H-TGL.
Comparison of H-TGL properties with lipoprotein lipase.
Analysis of H-TGL's catalytic activity on various lipid substrates.

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Main Results:

H-TGL is synthesized by hepatocytes and located on hepatic vascular endothelium.
Unlike lipoprotein lipase, H-TGL does not require an activator protein and is not inhibited by NaCl or protamine sulfate.
H-TGL catalyzes the hydrolysis of diverse lipid substrates, including triacylglycerols and phospholipids.

Conclusions:

The precise physiological role of H-TGL is not fully elucidated.
H-TGL may play a role in the clearance of triglyceride-rich lipoprotein remnants.
H-TGL is potentially involved in the catabolism of high-density lipoprotein (HDL).