Neuronal membrane phospholipid synthesis pathway (Kennedy pathway) (Kennedy pathway)

The neuronal membrane phospholipid synthesis pathway, primarily known as the Kennedy pathway, is the essential metabolic route for the de novo synthesis of phosphatidylcholine and phosphatidylethanolamine, the major structural components of neuronal membranes [11, 15]. This pathway involves three enzymatic steps in two parallel branches (CDP-choline and CDP-ethanolamine) and is critical for maintaining neuronal integrity, supporting synaptogenesis, and facilitating signal transduction [1, 13]. In neurodegenerative conditions like Alzheimer's disease, synaptic loss and altered phospholipid metabolism are early pathological features, leading to cognitive decline [1, 6]. Therapeutic strategies, such as the medical food Souvenaid (containing the Fortasyn Connect nutrient blend), target this pathway by providing a combination of rate-limiting precursors (choline, uridine, and omega-3 fatty acids) and cofactors (B-vitamins and antioxidants) [2, 4]. By increasing the substrate-saturation of the pathway's enzymes, these interventions aim to promote the formation of new synapses and preserve brain connectivity [7, 9]. While generally safe, these approaches are most effective during the prodromal or mild stages of disease, as the capacity for membrane repair diminishes as neurodegeneration progresses [1, 20].

Other names

Kennedy pathwayCDP-choline pathwayCDP-ethanolamine pathwayPhospholipid biosynthesis pathway

Increasing the availability of rate-limiting precursors and cofactors to enhance the substrate-saturation of enzymes in the Kennedy pathway, thereby promoting the de novo synthesis of phosphatidylcholine and phosphatidylethanolamine for neuronal membrane and synapse formation.