title: Delicate and crucial pH dependence in permeabilization of cultured mammalian cells by vortex-stirring with a high molecular weight polyacrylic acid.
abstract: We previously reported that cultured mammalian cells are effectively permeabilized by vortex-stirring the cells with a high molecular weight polyacrylic acid. The present study revealed that the efficiency of permeabilization of a non-permeant dye, Lucifer Yellow (LY), was sensitively affected by the pH of the medium. When the cells are vortex-stirred in RPMI 1640 culture medium, the pH of the medium should be adjusted with HEPES and NaOH, instead of NaHCO3, to a pH higher than 7.6 for successful permeabilization; the higher the pH, the better the result obtained. Internalization of LY was near the background level at a pH below 7.4. When phosphate-buffered saline was substituted for RPMI 1640 medium, the optimal pH range was slightly shifted to a more acidic region. This requirement for the pH of the medium is indispensable as a supplement to the standard permeabilization procedure tentatively proposed in the preceding report.
authors.affiliation: Faculty of Pharmaceutical Sciences, Nagoya City University, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Shimizu
authors.forename: Y
authors.initials: Y
authors.lastname: Kawazoe
mesh_terms: D000180:Acrylic Resins / Q000494:pharmacology*; D000818:Animals; D002463:Cell Membrane Permeability; D003470:Culture Media; D006863:Hydrogen-Ion Concentration; D007546:Isoquinolines / Q000493:pharmacokinetics; D007939:Leukemia L1210 / Q000378:metabolism; D051379:Mice; D014407:Tumor Cells, Cultured
chemical_list: D000180:Acrylic Resins; D003470:Culture Media; D007546:Isoquinolines; C006903:carbopol 940; C017475:lucifer yellow