Abstract
To elucidate behaviors of phosphorus compounds including inorganic phosphate (Pi) which may be closely linked with bone metabolism, efflux of Pi from and 31P NMR spectra of RBC were measured. Efflux of Pi from RBC into dialyzed plasma or saline lasts even after outer Pi concentration exceeds the original plasma Pi level, which suggests the Pi transport not controlled only by simple diffusion and the existence of Pi precursor (s) in RBC. 31P NMR spectra of RBC from dialysis patients reveal that it contains ATP and maybe sugar phosphate (SP) more than that from normal subjects and that 2, 3-diphosphoglycerate and SP are main precursors of Pi efflux from RBC.
