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Related Experiment Videos

Prostacyclin production by isolated adipocytes

L Axelrod, L Levine

    Diabetes
    |February 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Adipocytes produce prostacyclin (PGI2) during lipolysis, potentially regulating blood vessel tone and platelet aggregation. This PGI2 may maintain blood flow in adipose tissue and other areas.

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    Area of Science:

    • Biochemistry
    • Physiology
    • Endocrinology

    Background:

    • Adipocytes release prostacyclin (PGI2) during norepinephrine (NE)-induced lipolysis.
    • Endogenous PGI2 production rates were calculated for rats, men, and women.
    • These rates are comparable to exogenous PGI2 infusion levels affecting platelet aggregation and blood pressure.

    Purpose of the Study:

    • To investigate the role of PGI2 in NE-induced lipolysis.
    • To determine if PGI2 mediates functional vasodilation associated with lipolysis.
    • To assess PGI2's potential role in regulating vascular tone and platelet aggregation.

    Main Methods:

    • Isolated rat adipocytes were used to measure PGI2 production during NE-induced lipolysis.
    • Effects of exogenous PGI2 on lipolysis rate were assessed.

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  • Indomethacin was used to inhibit endogenous PGI2 production and its effect on lipolysis was evaluated.

    • Main Results:

    • Adipocytes produce significant amounts of PGI2 during NE-induced lipolysis.
    • Exogenous PGI2 did not alter the rate of NE-induced lipolysis.
    • Inhibition of PGI2 production did not affect NE-induced lipolysis, suggesting PGI2 is not directly involved in lipolysis regulation.
    • PGI2 is produced in greater quantities than PGE2 and is a more potent vasodilator.

    Conclusions:

    • PGI2, rather than PGE2, likely accounts for functional vasodilation during hormone-induced lipolysis.
    • Adipocyte-derived PGI2 may modulate vascular tone and platelet aggregation, contributing to vascular patency in adipose tissue.
    • PGI2's instability may explain why it was not previously detected in venous effluent.