This episode examines lipid-derived autacoids as local decision-makers: short-lived signals synthesised on demand from membrane lipids. Prostaglandins, thromboxanes, leukotrienes, and platelet-activating factor do not travel far or last long—but where and when they appear matters enormously. By mapping their synthesis and actions, we make sense of inflammation, fever, bronchoconstriction, platelet aggregation, and vascular tone, and we set the stage for understanding why COX inhibition and related strategies have such wide-ranging effects.

Key takeaways you’ll build and reuse throughout the series:

* On-demand synthesis: why autacoids are made locally rather than stored, and how this shapes their effects.

* Divergent pathways from a common source: arachidonic acid as a branching point with competing outcomes.

* Prostaglandins versus leukotrienes: complementary roles in inflammation, pain, fever, and airway tone.

* Platelet–vessel crosstalk: thromboxane and prostacyclin as opposing local signals governing clotting and flow.

* Therapeutic logic: how upstream inhibition (e.g., COX) produces broad effects—both beneficial and adverse.

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