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Journal of Experimental Biology 62,327-340 (1975)
Published by Company of Biologists 1975

The Reduced Glucose Permeability of the Isolated Malpighian Tubules of the Blowfly Calliphora Vomitoria

G. KNOWLES ¹

¹ Present address: Department of Medical Biochemistry, University of Manchester Medical School, Manchester, M13 9PT, U.K.

The excretion of several sugars by the isolated Malpighian tubules of Calliphora vomitoria has been investigated. The isolated tubules do not excrete glucose or trehalose at rates similar to those of sugars of the same molecular weight. Trehalose can be hydrolysed to glucose as it traverses the tubule wall. It is proposed that glucose can be reabsorbed by the tubule. Evidence is presented to suggest that glucose reabsorption can be saturated. Phloridzin was found to increase the rate of glucose excretion by the isolated Malpighian tubule.

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