Studies of cell pellets: II. Osmotic properties, electroporation, and related phenomena: membrane interactions

Biophysical Journal
I G AbidorS W Hui

Abstract

Using the relations between pellet structure and electric properties derived from the preceding paper, the responses of rabbit erythrocyte pellets to osmotic or colloidal-osmotic effects from exchanged supernatants and from electroporation were investigated. Changing the ionic strength of the supernatant, or replacing it with dextran or poly(ethylene glycol) solutions, caused changes of Rp according to the osmotic behavior of the pellet. Rp was high and ohmic before electroporation, but dropped abruptly in the first few microseconds once the transmembrane voltage exceeded the membrane breakdown potential. After the initial drop, Rp increased as a result of the reduction of intercellular space. Rp increased regardless of whether the pellets were formed before or immediately after the pulse, indicating that porated cells experienced a slow colloidal-osmotic swelling. The intercellular or intermembrane distances between cells in a pellet, as a function of osmotic, colloidal-osmotic, and centrifugal pressures used to compress rabbit erythrocyte pellets, were deduced from the Rp measurement. This offered a unique opportunity to measure the intermembrane repulsive force in a disordered system including living cells. Electrohemolysis ...Continue Reading

Citations

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