title: A novel method for measuring the ATP-related compounds in human erythrocytes.
abstract: The ATP-related compounds in whole blood or red blood cells have been used to evaluate the energy status of erythrocytes and the degradation level of the phosphorylated compounds under various conditions, such as chronic renal failure, drug monitoring, cancer, exposure to environmental toxics, and organ preservation. The complete interpretation of the energetic homeostasis of erythrocytes is only performed using the compounds involved in the degradation pathway for adenine nucleotides alongside the uric acid value. For the first time, we report a liquid chromatographic method using a diode array detector that measures all of these compounds in a small human whole blood sample (125 μL) within an acceptable time of 20 min. The stability was evaluated for all of the compounds and ranged from 96.3 to 105.1% versus the day zero values. The measurement had an adequate sensitivity for the ATP-related compounds (detection limits from 0.001 to 0.097 μmol/L and quantification limits from 0.004 to 0.294 μmol/L). This method is particularly useful for measuring inosine monophosphate, inosine, hypoxanthine, and uric acid. Moreover, this assay had acceptable linearity (r > 0.990), precision (coefficients of variation ranged from 0.1 to 2.0%), specificity (similar retention times and spectra in all samples) and recoveries (ranged from 89.2 to 104.9%). The newly developed method is invaluable for assessing the energetic homeostasis of red blood cells under diverse conditions, such as in vitro experiments and clinical settings.
authors.affiliation: Department of Pharmacology, School of Medicine, University of San Luis Potosi.
authors.forename: Othoniel Hugo
authors.initials: OH
authors.lastname: Aragon-Martinez
authors.forename: Othir
authors.initials: O
authors.lastname: Galicia
authors.forename: Mario Alberto
authors.initials: MA
authors.lastname: Isiordia-Espinoza
authors.forename: Flavio
authors.initials: F
authors.lastname: Martinez-Morales
mesh_terms: D000241:Adenosine / Q000032:analysis / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004906:Erythrocyte Count; D004912:Erythrocytes / Q000737:chemistry* / Q000502:physiology*; D006706:Homeostasis / Q000502:physiology*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D019271:Hypoxanthine / Q000032:analysis / Q000378:metabolism; D007288:Inosine / Q000032:analysis / Q000378:metabolism; D007291:Inosine Monophosphate / Q000032:analysis / Q000378:metabolism; D012680:Sensitivity and Specificity; D014527:Uric Acid / Q000032:analysis / Q000378:metabolism
chemical_list: D007291:Inosine Monophosphate; D014527:Uric Acid; D019271:Hypoxanthine; D007288:Inosine; D000255:Adenosine Triphosphate; D000241:Adenosine