Recipient cell membrane and associated uptake machinery

The recipient cell membrane and associated uptake machinery represent the collective biological structures and pathways responsible for the internalization of extracellular materials, including nutrients, signaling molecules, and therapeutic agents (Conner & Schmid, 2003, Nature). This system primarily consists of the plasma membrane—a semi-permeable phospholipid bilayer—and various endocytic pathways such as clathrin-mediated endocytosis, caveolae-mediated endocytosis, and macropinocytosis (Doherty & McMahon, 2009, Nature Reviews Molecular Cell Biology). In pharmacology and biotechnology, this machinery is a critical focus for the delivery of large or polar molecules, such as nucleic acids (mRNA, siRNA) and proteins, which cannot passively cross the lipid bilayer (Sahay et al., 2010, Nature Biotechnology). While not a single therapeutic target, modulating these pathways is essential for optimizing the efficacy of lipid nanoparticles (LNPs), viral vectors, and antibody-drug conjugates (Blanco et al., 2015, Nature Biotechnology). Dysregulation of uptake machinery is often observed in diseases like cancer, where altered endocytosis can drive nutrient acquisition or receptor signaling, and in viral infections, where pathogens hijack these systems to enter host cells (Parton & Simons, 2007, Nature Reviews Molecular Cell Biology).

Other names

Plasma membraneEndocytic machineryCellular uptake systemCell surfaceEndocytic pathway

Facilitation of cellular entry via clathrin-mediated endocytosis, caveolae-mediated endocytosis, macropinocytosis, or direct membrane fusion (Conner & Schmid, 2003, Nature).