Phosphatidylserine

Phosphatidylserine (PS) Product Introduction

1. Basic Information

• Chemical Name: Phosphatidylserine (PS)

• Structure: An anionic phospholipid composed of a serine head group linked to two fatty acid chains via a glycerol backbone.

• Location: Primarily localized in the inner leaflet of the plasma membrane under normal conditions but externalized during cellular activation or apoptosis 5.

• Source: Naturally occurring in eukaryotic cell membranes; commercially produced via soy lecithin extraction or enzymatic synthesis.

2. Technical Description

• Role in Membrane Dynamics: PS externalization alters membrane biophysical properties, facilitating interactions with extracellular proteins and receptors 5.

• Key Receptors: Binds to receptors such as TAM (Tyro3, Axl, Mertk), TIM (T-cell immunoglobulin and mucin), and integrins, mediating immune signaling and efferocytosis (engulfment of apoptotic cells) 45.

• Biochemical Stability: Sensitive to phospholipid scramblases and flippases, which regulate its transmembrane distribution 5.

3. Key Functions

1. Immune Regulation:

   • Efferocytosis: Externalized PS signals phagocytes to engulf dying cells, preventing inflammation and autoimmune responses 5.

   • Anti-inflammatory Signaling: PS-receptor interactions (e.g., TAM receptors) suppress pro-inflammatory cytokines and promote tissue repair 513.

2. Pathogen Evasion:

   • Apoptotic Mimicry: Viruses (e.g., Ebola, HIV) and parasites (e.g., Leishmania) expose PS to evade immune detection and enhance infection 45.

3. Cellular Signaling:

   • Lipid Metabolism: PS mediates cholesterol delivery to macrophages, contributing to foam cell formation in atherosclerosis 14.

   • Neuroprotection: Supports synaptic plasticity and neuronal survival via interactions with neurotrophic receptors 5.

4. Applications

Pharmaceuticals & Therapeutics

• Cancer Therapy: Monoclonal antibodies (e.g., bavituximab) target PS on tumor vasculature to block immune evasion and enhance anti-tumor responses 5.

• Sepsis Treatment: Recombinant phospholipid transfer protein (PLTP) reduces inflammation and cardiomyocyte pyroptosis by inhibiting NLRP3 inflammasome activation 11.

• Neurodegenerative Diseases: Investigated for Alzheimer’s and Parkinson’s disease due to its role in neuronal membrane stability 5.

Nutraceuticals & Cosmetics

• Cognitive Supplements: Marketed for memory enhancement and stress reduction, leveraging PS’s role in brain cell signaling.

• Anti-Aging Skincare: Incorporated into creams for its membrane-stabilizing and anti-inflammatory properties