Anion exchange through band 3 protein in canine leishmaniasis at different stages of disease

作者：Morabito Rossana; Remigante Alessia; Cavallaro Mauro; Taormina Alessandro; La Spada Giuseppina; Marino Angela^*

来源：Pflugers Archiv-European Journal of Physiology, 2017, 469(5-6): 713-724.

DOI：10.1007/s00424-017-1974-2

• Canine leishmaniasis
• Erythrocytes
• Band 3 protein
• SO4 (=) uptake
• Oxidative stress
• Phosphorylation pathways

Band 3 protein efficiency in mediating Cl-/HCO3 (-) exchange through erythrocytes membrane is reduced by oxidative stress. The aim of the present study was to verify whether and how anion transport through band 3 protein may be useful in monitoring canine leishmaniasis (Leishmania infantum) development, a disease associated to membrane protein degradation and oxidative stress. To accomplish this aim, serological analysis to determine IFAT (immunofluorescence antibody test) titers against leishmaniasis has been performed and 1:160 and 1:540 titers, determined at diagnosis and after 6 months, were considered for experiments. Oxidative conditions have been assessed by estimating MDA (malondialdehyde) plasma levels, intracellular GSH (reduced glutathione) content, and membrane -SH groups. Band 3 protein anion exchange capability was evaluated by measuring the rate constant for SO4 (=) uptake, and its expression levels, along with those of P-Tyr (phosphorylated tyrosine), involved in pathways underlying band 3 protein function, have been also determined. Our results show that, in infected dogs with 1:160 IFAT titer, high MDA plasma levels and oxidation of -SH groups are associated to increased P-Tyr expression levels, leading to a reduction in anion exchange capability throughout 6 months of diagnosis. On the other hand, infected dogs with 1:540 IFAT titer, exhibited oxidative conditions associated to an impaired anion exchange capability at diagnosis, were ameliorated after 6 months. Such findings suggest that (1) band 3 protein-mediated anion transport is reduced by oxidative conditions associated to leishmaniasis, putatively via phosphorylative pathways; (2) band 3 protein efficiency may account for canine leishmaniasis development; and (3) the assessment of band 3 protein function may represent an additional tool for canine leishmaniasis diagnosis and monitoring of its development, with potential application to humans, either in case of leishmaniasis or other oxidative-related pathologies.

• 出版日期2017-6