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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Induction of transport of organic anions in Malpighian tubules of Rhodnius.

1.The ability of Rhodnius Malpighian tubules to transport organic anions such as p-aminohippuric acid (PAH) and amaranth depends on the physiological state of the insect. Unfed insects progressively lose this ability, but the transport mechanisms rapidly become activated after a blood meal. 2. This induction occurs in adults as well as larval instars and is not prevented by decapitation. 3. No increase in rates of excretion of organic anions follows a meal of Ringer's solution or a single injection of 0-1 mumoles of PAH into the haemolymph. 4. Accelerated PAH excretion is induced in insects fed (a) blood plasma alone or a suspension of red blood cells in saline, (b) solutions of serum albumin or casein, and (c) whole or diluted milk. 5. These results show that the ingestion of a protein-rich meal is sufficient to induce an accelerated transport of organic anions such as PAH and they suggest that this induction is not controlled by a hormone released in response to abdominal distension but depends instead on the continued presence in the haemolymph of some product of digestion of the meal.[1]


  1. Induction of transport of organic anions in Malpighian tubules of Rhodnius. Maddrell, S.H., Gardiner, B.O. J. Exp. Biol. (1975) [Pubmed]
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