Al3+ and Ca2+ Alteration of Membrane Permeability of Quercus rubra Root Cortex Cells 1

AUTOR(ES)

Zhao, Xiao-Jun

RESUMO

This study was undertaken to quantify the effect of aluminum and calcium on membrane permeability. The influence of Ca2+ (0.2-3.7 millimolar) and Al3+ (0-3.7 millimolar) on the permeability of root cortical cells of Quercus rubra was measured using three nonelectrolytes (urea, methyl urea, and ethyl urea) as permeators of progressively increasing lipid solubility. Water permeability was also measured. Al3+ (a) increased membrane permeability to the nonelectrolytes, (b) decreased the membrane's partiality for lipid permeators, and (c) decreased membrane permeability to water. Ca2+ had effects on permeability that were opposite to those of Al3+. When Al3+ and Ca2+ were tested in combination, these opposite effects counteracted each other. The results suggest that Al3+ altered the architecture of membrane lipids.

Documentos Relacionados

• Roles for Ca2+ stores release and two Ca2+ influx pathways in the Fc epsilon R1-activated Ca2+ responses of RBL-2H3 mast cells.
• CaV 3.1 and CaV 3.3 account for T-type Ca2+ current in GH3 cells
• Membrane voltage initiates Ca2+ waves and potentiates Ca2+ increases with abscisic acid in stomatal guard cells
• Regulation of Ca2+ influx in myeloid cells. Role of plasma membrane potential, inositol phosphates, cytosolic free [Ca2+], and filling state of intracellular Ca2+ stores.
• Gas permeability and compressive strength evaluation of porous Al2O3 supported membrane