Abstract
We previously reported that HgCl2 inhibits water and urea flux in tissues fixed with glutaraldehyde after antidiuretic hormone (ADH) stimulation and suggested that the ADH-induced water channel may share characteristics of the red blood cell and proximal tubule water transport pathway. To determine the specificity of mercury's action, we examined the effect of numerous other metals. In tissues fixed after ADH stimulation, water flow and urea and sucrose permeabilities are maintained from mucosal bath pH 2.5 through pH 12. Several metals including Ba, Co, Fe, Sr and Zn did not alter flux. Al, Cd, La, Li, Pb and U inhibited urea permeability but not water flow. At pH 2.8, Cu inhibited water flow by 30% and urea permeability by 50%. At pH 4.9–7.4, Cu inhibited urea permeability but not water flow. At pH ≤3.0, Pt inhibited flow in ADH-pretreated tissues. The inhibitory effect was not present at pH>3.0. At pH<3.0, Au inhibited flow by 90% in tissues fixed after pretreatment with ADH but increased the permeability of tissues fixed in the absence of ADH. Ag inhibited flow by 70% but also increased sucrose, urea, and basal permeabilities. This suggests that Ag and Au disrupt epithelial integrity. These results indicate that at physiologic pH, the ADH-induced water channel is specifically blocked by Hg but not by other metals. This specificity may reflect the presence of a large number of sulfhydryl groups in the water channel.
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Hoch, B.S., Gorfien, P.C., Eres, A. et al. Comparative effect of metals on antidiuretic hormone induced transport in toad bladder: specificity of mercuric inhibition of water channels. Biometals 5, 95–101 (1992). https://doi.org/10.1007/BF01062220
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DOI: https://doi.org/10.1007/BF01062220