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High affinity esterification of eicosanoid precursor fatty acids by platelets.

E J Neufeld, D B Wilson, H Sprecher

The Journal of Clinical Investigation

|July 1, 1983

Summary

Human platelets preferentially uptake arachidonic acid and eicosapentaenoic acid over other fatty acids, suggesting a specific mechanism for collecting these essential compounds.

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Area of Science:

Biochemistry
Cell Biology
Physiology

Background:

Platelets play a crucial role in hemostasis and inflammation.
Fatty acid uptake by platelets is essential for synthesizing signaling molecules like eicosanoids.
The specific mechanisms governing fatty acid uptake in platelets are not fully elucidated.

Purpose of the Study:

To investigate the relative rates and mechanisms of fatty acid uptake into human platelets.
To determine the kinetic parameters (Km and Vmax) for the esterification of various fatty acids into platelet phospholipids.
To identify the physiological relevance of observed fatty acid uptake specificities.

Main Methods:

Washed human platelets were incubated with radiolabeled fatty acids in the presence of fatty acid-free albumin.
Esterification of fatty acids into cellular phospholipids was measured over time.
Kinetic analysis was performed to determine apparent Michaelis constant (Km) and apparent maximum velocity (Vmax) at different pH levels.
Competition assays were conducted using unlabeled fatty acids to assess uptake specificity.

Main Results:

Two distinct classes of fatty acid uptake rates were observed.
Arachidonate and eicosapentaenoate showed high-affinity, rapid incorporation (low Km, high Vmax).
Stearate, oleate, and linoleate were incorporated less efficiently (high Km, low Vmax).
Uptake specificity resembled that of platelet long-chain acyl-CoA synthetase.

Conclusions:

Platelets possess a specific esterification system that preferentially uptakes arachidonic acid and eicosapentaenoate.
This system likely represents the physiological mechanism for platelet arachidonate uptake from plasma.
The findings suggest a targeted mechanism for acquiring essential fatty acids for platelet function, despite their lower plasma concentrations compared to other fatty acids.