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Related Experiment Videos

Neutral triglyceride lipase in macrophages.

J C Khoo, J E Vance, E M Mahoney

    Arteriosclerosis (Dallas, Tex.)
    |January 1, 1984
    PubMed
    Summary

    Macrophages exhibit high neutral triglyceride lipase activity, crucial for breaking down fats. This enzyme is heat-stable and highly active, potentially aiding in clearing lipids within foam cells.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Immunology

    Background:

    • Macrophages play a key role in lipid metabolism and immune responses.
    • Dysregulation of lipid metabolism in macrophages contributes to diseases like atherosclerosis.
    • Understanding macrophage lipases is vital for developing targeted therapies.

    Purpose of the Study:

    • To characterize the neutral triglyceride lipase activity in various macrophage types.
    • To investigate the kinetic properties and optimal conditions for macrophage neutral triglyceride lipase.
    • To compare the activity of this lipase with other lipolytic enzymes in macrophages.

    Main Methods:

    • Assaying neutral triglyceride lipase activity in J774 cells, human monocyte/macrophages, rabbit alveolar macrophages, and mouse peritoneal macrophages.
    • Determining pH optima and the effect of bovine serum albumin and NaCl concentrations.
    • Comparing specific activities with lipoprotein lipase, neutral cholesterol esterase, and hormone-sensitive lipase.

    Main Results:

    • High neutral triglyceride lipase activity was detected across multiple macrophage types.
    • Optimal activity occurred at pH 6.5-7.4, with maximal stimulation by 0.625 mg/ml bovine serum albumin.
    • The enzyme demonstrated remarkable thermostability up to 50°C and was inhibited by 0.1 M NaCl.
    • Specific activity in J774 cells was over 100-fold higher than lipoprotein lipase or neutral cholesterol esterase and 10-fold higher than hormone-sensitive lipase.

    Conclusions:

    • Macrophages possess a highly active and thermostable neutral triglyceride lipase.
    • This enzyme exhibits distinct properties compared to other lipases.
    • The findings suggest a significant role for this neutral triglyceride lipase in the degradation and mobilization of cytosolic triglycerides within macrophage-derived foam cells.

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