...Natalia Capriotti; Paula Gioino; Sheila Ons; Juan P. Ianowski ABSTRACT Rhodnius prolixus is a blood-feeding insect vector of Tr y panosoma cruzi , a protozoan parasite that causes Chagas disease. During each blood meal, the animals ingest large volumes of blood, that may be up to 12 times the unfed...

...Geoffrey M. Coast SUMMARY The pioneering work of Simon Maddrell established that the rapid postprandial diuresis of the haematophagous insect Rhodnius prolixus is controlled by a diuretic hormone and demonstrated the role of the Malpighian tubules in meeting the volumic, osmotic and ionic...

...Victoria A. Te Brugge; David A. Schooley; Ian Orchard SUMMARY Diuresis in the blood-gorging hemipteran Rhodnius prolixus is under neurohormonal control and involves a variety of processes and tissues. These include ion and water movement across the epithelium of the crop and the Malpighian tubules...

... not affect intracellular pH. However, intracellular pH shifted 0.25 pH units more acid in Na + -free saline, suggesting that a Na + -dependent pH regulatory mechanism is at play in steady state pH regulation during fluid secretion by Malpighian tubules of Rhodnius prolixus . The data are consistent...

...Jean-Paul Paluzzi; Ian Orchard SUMMARY In the haematophagous insect Rhodnius prolixus , diuresis is accomplished through the combined actions of peptidergic diuretic hormones and 5-HT released from neurohaemal sites on the abdominal nerves. Preliminary work on anti-diuresis in this blood-feeder...

...C. S. Bjornsson; E. Huebner SUMMARY The spatiotemporal dynamics of transmembrane hydrogen ion (H + )fluxes during oogenesis were investigated in the telotrophic ovarioles of the insect, Rhodnius prolixus . Although Rhodnius ovarioles possess exaggerated morphological and electrical polarity between...

... of Rhodnius prolixus and Drosophila melanogaster . Secretion rates of Rhodnius tubules in amino-acid-free saline increase after addition of serotonin to a peak value, then slowly decline to a plateau. Addition of glutamine, glutamate or aspartate to such tubules increases secretion rates dramatically relative...

...Juan P. Ianowski; Robert J. Christensen; Michael J. O'Donnell SUMMARY Intracellular ion activities ( a ion ) and basolateral membrane potential ( V bl ) were measured in Malpighian tubule cells of Rhodnius prolixus using double-barrelled ion-selective microelectrodes. In saline containing 103mmoll...

... Applications . Chichester , New York : John Wiley & Sons Ltd . Kälin , M. and Barrett , F. M. ( 1975 ). Observations on the anatomy, histology, release-site and function of Brindley’s glands in the blood-sucking bug, Rhodnius prolixus . Ann. Ent. Soc. Am . 68 , 126 – 134 . 10.1093...

...V. A. Te Brugge; S. M. Miksys; G. M. Coast; D. A. Schooley; I. Orchard ABSTRACT The blood-feeding bug Rhodnius prolixus ingests a large blood meal, and this is followed by a rapid diuresis to eliminate excess water and salt. Previous studies have demonstrated that serotonin and an unidentified...

...Michael C. Quinlan; Nathan J. Tublitz; Michael J. O’Donnell ABSTRACT Rhodnius prolixus eliminates NaCl-rich urine at high rates following its infrequent but massive blood meals. This diuresis involves stimulation of Malpighian tubule fluid secretion by diuretic hormones released in response...

...K. A. Collier; M. J. O’donnell ABSTRACT The pH and concentrations of K + and Cl − in the unstirred layer (USL) associated with the basolateral surfaces of the upper and lower Malpighian tubules of Rhodnius prolixus were measured using extracellular ion-selective microelectrodes. When stimulated...

...Charlene A. Haley; Michael J. O’Donnell ABSTRACT Active K + reabsorption by the lower Malpighian tubule of the blood-feeding hemipteran Rhodnius prolixus does not involve the amiloride-sensitive K + /H + exchangers or V-type H + -ATPases implicated in secretion of ions from haemolymph to lumen...

...H. Mulye; K. G. Davey ABSTRACT Neurosecretory cells in the brain of Rhodnius prolixus are known to be the source of an ovulation hormone released at feeding. They were selected to test the hypothesis that feeding brings about the release of another hormone in the abdomen which is transported...

...Roberto H. Nussenzveig; David L. Bentley; JosÉ M. C. Ribeiro ABSTRACT The salivary glands of the blood-sucking bug Rhodnius prolixus are formed by a single layer of binucleated epithelial cells surrounded by a double layer of transversely oriented smooth muscle cells. The epithelial cells are rich...

...S. H. P. Maddrell; M. J. O’donnell; R. Caffrey ABSTRACT The blood-sucking insect Rhodnius prolixus rapidly eliminates a Na + -rich K + -poor urine after its large meals. K + -rich fluid is first secreted by the upper Malpighian tubules and passes to the lower tubules where most of the potassium...

... by Company of Biologists 1993 potassium ions sodium ions excretion fluid secretion Rhodnius prolixus salivary glands Calliphora vicina Malpighian tubules epithelial transport gramicidin D Insect epithelia such as the salivary glands of blowflies and the Malpighian tubules...

...S. H. P. Maddrell; W. S. Herman; R. W. Farndale; J. A. Riegel ABSTRACT Forskolin stimulates rapid fluid secretion by the Malpighian tubules of Rhodnius prolixus at concentrations above 5X10 −6 mol l −1 . In the presence of a threshold concentration of forskolin, the tubules are 30–50 times more...

... those that selectively reduce the rate of anion passage lead to secretion of acid fluid. © 1992 by Company of Biologists 1992 V-ATPase insect Malpighian tubules Rhodnius prolixus ion transport fluid transport amiloride furosemide cyclic AMP 5-HT The Malpighian tubules...