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Recent studies of molecular mobility in the plasma membrane have revealed that diffusion is restricted by cytoskeletal networks or fences. Transmembrane protein “pickets” that reversibly associate with the membrane-associated skeleton and with the pericellular coat impede the movement of unattached bystander molecules. While membrane picket-fences were originally described as barriers to free diffusion...
Phagocytes recognize and eliminate pathogens, alert other tissues of impending threats, and provide a link between innate and adaptive immunity. They also maintain tissue homeostasis, consuming dead cells without causing alarm. The receptor engagement, signal transduction, and cytoskeletal rearrangements underlying phagocytosis are paradigmatic of other immune responses and bear similarities to macropinocytosis...
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