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Am J Physiol Renal Physiol 278: F192-F201, 2000;
0363-6127/00 $5.00
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Vol. 278, Issue 2, F192-F201, February 2000

INVITED REVIEW
Targeting of membrane transporters in renal epithelia: when cell biology meets physiology

Dennis Brown

Program in Membrane Biology and Renal Unit, Massachusetts General Hospital, and Department of Pathology, Harvard Medical School, Boston, Massachusetts 02114

Epithelial cells in the kidney have highly specialized transport mechanisms that differ among the many tubule segments, and among the different cell types that are present in some regions. The purpose of this brief review is to examine some of the major intracellular mechanisms by which the membrane proteins that participate in these differentiated cellular functions are addressed, sorted, and delivered to specific membrane domains of epithelial cells. Unraveling these processes is important not only for our understanding of normal cellular function but is also critical for the interpretation of pathophysiological dysfunction in the context of newly generated molecular and cellular information concerning hereditary and acquired transporter abnormalities. Among the topics covered are sorting signals on proteins, role of the cytoskeleton, vesicle coat proteins, the fusion machinery, and exo- and endocytosis of recycling proteins. Examples of these events in renal epithelial cells are highlighted throughout this review and are related to the physiology of the kidney.

protein sorting; epithelial polarity; cytoskeleton; vesicle trafficking; membrane recycling


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