stilbenes and methylamine

The unidirectional influx of 36Cl- into isolated chick epithelial cells is 30% inhibited by 300 microM SITS. Characteristics of the SITS-sensitive flux pathway were examined in terms of sensitivity to changes in membrane potential and intracellular pH. Potential dependence was evaluated using unidirectional influx of [14C]tetraphenylphosphonium ([14C]-TPP+) as a qualitative sensor of diffusion potentials created by experimentally imposed gradients of Cl-. Steady-state distribution of [14C]methylamine ([14C]MA) was used to examine for Cl(-)-dependent changes in intracellular pH. Imposed Na+ gradients, but not Cl- gradients, induce changes in [14C]MA distribution. SITS does not alter the [14C]MA distribution observed in cells with imposed gradients of Na+ and Cl-. Both results suggest that inhibition of Cl(-)-OH- exchange system is not the basis for the SITS effect on Cl- influx. However, if relative permeabilities for ion pairs via conductance pathways are compared, it can be shown that SITS causes a marked reduction of Pcl relative to either PNa or PK. SITS also inhibits electrically induced influx of [14C]TPP+ or [14C] alpha-methylglucoside driven by imposed Cl- gradients. Conversely, electrically driven Cl- influx can be blocked by SITS. These observations are all consistent with a SITS-sensitive Cl- conductance pathway associated with the plasma membrane of chick intestinal cells. No Cl(-)-OH- exchange capability can be detected for chick intestinal cells.

Topics: 4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid; Animals; Biological Transport; Cell Membrane Permeability; Chickens; Chlorides; Diffusion; Epithelium; Hydrogen-Ion Concentration; Intestinal Mucosa; Membrane Potentials; Methylamines; Onium Compounds; Organophosphorus Compounds; Quaternary Ammonium Compounds; Sodium; Stilbenes