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Potassium chloride transport across an insect epithelium characterization of potassium stimulated chloride absorption and active potassium transport

, : Potassium chloride transport across an insect epithelium characterization of potassium stimulated chloride absorption and active potassium transport. Journal of Experimental Biology 111: 201-224

The kinetics of 36Cl fluxes across cAMP-stimulated, short-circuited locust rectum [Schistocerca gregaria] were studied. Raising external K+ from 0 to 100 mM increased both the apparent affinity of the transport mechanism and Vmax for net Cl transport .**GRAPHIC**. by 4- to 6-fold. Hill plots of .**GRAPHIC**. indicated non-cooperative Cl interactions. The sequence for cation stimulation of .**GRAPHIC**. was K > Rb > Cs > Na > NH4. Low levels of K were stimulatory only when added to the mucosal side. cAMP caused a small active absorption of K, although this was minor compared to the 4-fold increase in transepithelial K diffusion (PK). Neither cAMP stimulation of .**GRAPHIC**. nor of Pk was sensitive to Cl removal, suggesting that K-stimulated Cl absorption and K transport are not mediated by the same co-transport mechanism. K is the counter-ion for electrogenic Cl transport because .**GRAPHIC**. was < 10% of the .**GRAPHIC**. during cAMP exposure under short circuit current conditions, but .**GRAPHIC**. equalled .**GRAPHIC**. at open circuit.


Other references

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Zhang, W-xi.; Zhang, H-lin.; Li, C-chong.; Luo, Y-chun.; Cheng, J-min.; Huang, L.; Bai, G-hui., 2011: Clinical analysis of 234 cases with congenital malformations of respiratory system. To explore clinical characteristics, radiographic findings and diagnostic methods of patients with congenital malformations of respiratory system for enhancing the diagnosis of congenital malformations of respiratory system in children. Totally 23...

Didier, R., 1913: La mouette rose. Rev. ornith. Paris: 159-160

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Pafumi, C.; Mancari, R.; Parisi, G.; Farina, M.; Russo, A.; Pernicone, G.; Bandiera, S.; Giardina, P.; Mirisola, T.; Stagno, F.; Calogero, A.E., 2002: VLA-2 and VLA-5 cell adhesion molecules expression in CD34+ cells from umbilical cord blood and from bone marrow. Background/Aims: Umbilical cord blood contains a large number of early hematopoietic cells with high proliferating capacity, that has been used as an alternative to bone marrow transplantation. The aim of this study is to investigate the number of...

Ezri, M.D.; Huang, S.K.; Messer, J.V.; Denes, P., 1982: Electrophysiologic observations of concealed ventricular depolarizations due to amiodarone. American Heart Journal 104(1): 169-172

DiGiovanni, R.M.; Erickson, R.P.; Ohlson, E.C.; Bernas, M.; Witte, M.H., 2014: A novel FLT4 mutation identified in a patient with Milroy disease. Milroy disease is an autosomal dominant disorder generally presenting with below the knee lymphedema at birth. It is linked to mutations in the tyrosine kinase domain of the VEGFR3 protein which is encoded in the FLT4 gene. Here we report a case o...

Verbanck, S.; Vanderhelst, E., 2017: The Respective Roles of LCI and MRI in the Clinical Management of Cystic Fibrosis Patients. American Journal of Respiratory and Critical Care Medicine

Shkorbatov G.L., 1984: The problem of species and problems in hydrobiology. Gidrobiologicheskii Zhurnal 20(3): 3-11

Anonymous, 2000: Spices and aromatic plants: challenges and opportunities in the new century. Contributory papers. Centennial conference on spices and aromatic plants, Calicut, Kerala, India, 20-23 September, 2000. The contributory papers and posters, 75 altogether, are arranged theme-wise: (1) Crop Improvement & Biotechnology (22); (2). Crop Production (33); (3) Economics & Marketing (3); (4) Crop Protection (8); and (5). Post Harvest Technology (9). Among...