Effect of metavanadate on papillary water uptake

: It has been examined the influence of vanadium on the papillary osmotic water-salts uptake in order to differentiate it from water flow of other biological substrates as amphibia epithelia. Between the different vanadium compounds only the metavanadate is active and only after administration in the abdominal vein. The general influence of metavanadate is a facilitating one and concerns: electrical receptor afferent discharge, osmotic water uptake and ciliary motility. At the papillary level therefore vanadium is not at all an inhibitory agent as observed in many biological substrates. This observation rule out any analogy in the processes of water inflow operating respectively at the fungiform papillae and amphibia epithelia.