title: Comparative biochemical, histochemical and autoradiographic studies of Na+/k+-ATPase in the rectum of dragonfly larvae (Odonata, Aeshnidae).
abstract: Na+/K+-ATPase localization in the rectal wall of larval Aeshna cyanea (Insecta, Odonata) was studied with histochemical precipitation techniques and 3H-ouabain autoradiography in conjunction with biochemical measurements of enzyme activities and radiospectrometry of 3H-ouabain binding, respectively. The NPP-strontium and ATP-lead methods led to complete inhibition of Na+/K+-ATPase in this organ and hence to unreliable histochemical results. The 3H-ouabain binding technique revealed sodium pump sites at the basolateral plasma membranes of the absorptive rectal chloride epithelia.
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000201:enzymology / Q000648:ultrastructure; D006651:Histocytochemistry; D007313:Insecta / Q000033:anatomy & histology / Q000201:enzymology*; D007814:Larva; D007854:Lead; D010042:Ouabain / Q000494:pharmacology; D012007:Rectum / Q000201:enzymology / Q000648:ultrastructure; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism*; D013324:Strontium
chemical_list: D007854:Lead; D010042:Ouabain; D000254:Sodium-Potassium-Exchanging ATPase; D013324:Strontium