title: Collapse of K+ and ionic balance during photodynamic inactivation of leukemic cells, erythrocytes and Staphylococcus aureus.
abstract: 1. The immediate and fast ionic fluxes in Friend erythroleukemic cells (FELC), erythrocytes and Staphylococcus aureus during short intervals of porphyrin mediated photosensitization were determined uniquely by X-ray microanalysis (XRMA) combined with electron microscopy. 2. Photodynamic inactivation of FELC was mediated by either endogenous protoporphyrin induced by 5-amino levulinic acid (5-ALA), or Photofrin-II. We describe the predominant phenomena of > 85% K-loss within 2-10 min of photoactivation. However the accompanied Na inflow and the collapse of the cellular balance of elemental-composition were inconsistent and acted as a function of cell damage. 3. Erythrocytes treated with hematoporphyrin (HP) lost most of their intracellular K yet instantly gained Na. Nevertheless the K/Na molar ratio of the control erythrocytes was nearly 12/1 while after photosensitization and K loss it changed to 1/1. 4. The S. aureus bacteria photosensitized with HP showed entire K-loss as well as marked Na efflux which increased with irradiation time; this was accompanied by the decline of other cell elements. 5. The prevailing K loss in FELC, erythrocytes and bacteria during the first minutes of photosensitization is deduced to be an immediate primary consequence of the photodynamic effect, while other ionic changes are joined in order with the development of cellular damage.
authors.affiliation: Life Sciences Department, Bar-Ilan University, Ramat-Gan, Israel.
authors.forename: Z
authors.initials: Z
authors.lastname: Malik
authors.forename: T
authors.initials: T
authors.lastname: Babushkin
authors.forename: S
authors.initials: S
authors.lastname: Sher
authors.forename: J
authors.initials: J
authors.lastname: Hanania
authors.forename: H
authors.initials: H
authors.lastname: Ladan
authors.forename: Y
authors.initials: Y
authors.lastname: Nitzan
authors.forename: S
authors.initials: S
authors.lastname: Salzberg
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004912:Erythrocytes / Q000187:drug effects*; D006801:Humans; D007477:Ions; D004915:Leukemia, Erythroblastic, Acute / Q000188:drug therapy* / Q000473:pathology; D007942:Leukemia, Experimental / Q000188:drug therapy / Q000473:pathology; D008875:Middle Aged; D010778:Photochemotherapy; D011188:Potassium / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism; D013211:Staphylococcus aureus / Q000187:drug effects*; D014407:Tumor Cells, Cultured
chemical_list: D007477:Ions; D012964:Sodium; D011188:Potassium