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Endocytosis and Signal Transduction: Basic Science Update

Department of Medicine at the Medical College of Ohio in Toledo

Joseph I. Shapiro, MD

Department of Medicine and a professor of Medicine and Pharmacology at the Medical College of Ohio in Toledo, jshapiro{at}mco.edu

Endocytosis can be separated into the categories of phagocytosis and pinocytosis. Phagocytosis can be distinguished from pinocytosis primarily by the size of particle ingested and by its dependence on actin polymerization as a key step in particle ingestion. Several specific forms of pinocytosis have been identified that can be distinguished based on their dependence on clathrin or caveolin. Both clathrin and caveolin-dependent pinocytosis appear to require the participation of dynamin to internalize the plasma membrane. Other, less well-characterized forms of pinocytosis have also been described. Although endocytosis has long been known to affect receptor density, recent studies have demonstrated that endocytosis through clathrin- and caveolin-dependent processes plays a key role in receptor-mediated signal transduction. In some cases, blockade of these processes attenuates, or even prevents, signal transduction from taking place. This information, coupled with a better understanding of endocytosis mechanisms, will help advance the field of cell biology as well as present new targets for drug development and disease treatment.

Key Words: pinocytosis • phagocytosis • receptor • clathrin • caveolin • endosome • lysosome

Biological Research For Nursing, Vol. 5, No. 2, 117-128 (2003)
DOI: 10.1177/1099800403256860


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