title: Manganese as a calcium probe: electron paramagnetic resonance and nuclear magnetic resonance spectroscopy of intact cells.
abstract: When Lettree cells are exposed to Mn2+, the cation becomes associated with cells in two ways: in a relatively loose and mobile manner that gives a six-line EPR spectrum designated Mnb*, and in an immobile, relatively tight manner that gives no detectable EPR specrtum, designated Mnb. Mnb* is probably on the surface of cells; most Mnb is probably inside cells. NMR measurements of Lettree cell suspensions show two water proton relaxation rates and confirm the existence of cell-associated Mn. Human erythrocytes, on the other hand, bind no Mn2+ under these conditions, as judged by EPR and NMR measurements. Virally-treated Lettree cells show an increase in Mnb (but not in Mnb*). They also show a third water proton relaxation rate.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D002472:Cell Transformation, Viral; D004578:Electron Spin Resonance Spectroscopy; D004912:Erythrocytes / Q000378:metabolism; D006801:Humans; D066298:In Vitro Techniques; D009682:Magnetic Resonance Spectroscopy; D008345:Manganese / Q000378:metabolism*; D051379:Mice; D009374:Neoplasms, Experimental / Q000378:metabolism; D010222:Parainfluenza Virus 1, Human
chemical_list: D008345:Manganese; D002118:Calcium