[Effect of Ca ions and pH on the osmotic potential across the epithelium of the small intestine].

It was found that kinetic features of the behaviour of osmotic potential differences through epithelial cells layer were characteristic of determination of mechanic properties of separate structures of intercellular junctions. The quantitative estimation of the contribution of tight junction and simple junctions to the value of mechanic connection was performed. The mechanism of structure reorganisation in intercellular junctions under osmotic pressure are discussed. A model of intercellular junctions that accounts for the essential feature of transepithelial potential differences behavior under the osmotic pressure is proposed.