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Journal of Cell Science, Vol 88, Issue 2 251-265, Copyright © 1987 by Company of Biologists

JOURNAL ARTICLES

The permeability properties of septate junctions in Malpighian tubules of Rhodnius

HB Skaer, SH Maddrell and JB Harrison
Agricultural and Food Research Council Unit of Insect Neurophysiology & Pharmacology, Department of Zoology, Cambridge, UK.

This paper describes the structural characteristics and permeability properties of the smooth septate junctions between the upper Malpighian tubule cells of a blood-sucking bug, Rhodnius prolixus. The permeability of the paracellular route was tested only for solutes that could be demonstrated not to cross the epithelium via the cellular route. The intercellular clefts were readily permeated by sucrose, inulin and polyethylene glycol (PEG), showing a higher permeability to molecules of smaller radius (PEG versus sucrose). Negatively charged molecules permeated the clefts more readily than positively charged ones. The effects of pH, urea and luminal flow rate on permeability were studied. The results are discussed in relation to the physiological tightness of the Malpighian tubules to certain solutes and to its function as an excretory epithelium.


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© The Company of Biologists Ltd 1987