title: [Glucose-6-phosphate dehydrogenase activity as a marker of resolution in the separation of rabbit erythroblasts according to their stage of maturation].
abstract: The glucose 6 phosphate dehydrogenase (G6PD) activity of erythroblasts, separated at different advancing stages of development by the velocity sedimentation technique at unit gravity, shows a characteristic sigmoidal curve. The G6PD activity is high and constant in the dividing compartment, steeply declines between the polychromatic and the orthochromatic stage, and returns almost constant during the development from the orthochromatic to the reticulocyte stage. This report focuses on the possibility to use the G6PD activity curve to indicate a loss of resolution in the fractionation process. For this purpose two parameters of the graph were used: (h) which represents the distance between the two constant phases of the curve and (s) the slope of the decreasing part of the graph. In this view we have fractionated on a 400 ml linear gradient of sucrose (1%-2% in PBS), increasing amounts of bone marrow cells from anaemic rabbit. Suspensions of 100, 200, 350 and 700 millions of cells (25 ml in PBS) were separated in different experiments and the obtained G6PD activity curves were compared. We have seen that the two parameters h and s remained constant up to 200 millions of cells, while they declined markedly when the number of cells loaded on the gradient increased to 350 and 700 millions. The separated cells were grouped into three sets of fractions: fraction I with cells belonging to the high and constant phase of the graph, fraction II to the decreasing phase and fraction III to the low and constant activity phase.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Istituto di Chimica Biologica dell'Università degli Studi di Urbino.
authors.forename: L
authors.initials: L
authors.lastname: Baronciani
authors.forename: P
authors.initials: P
authors.lastname: Ninfali
authors.forename: G
authors.initials: G
authors.lastname: Piacentini
mesh_terms: D000818:Animals; D015415:Biomarkers; D004900:Erythroblasts / Q000201:enzymology*; D005954:Glucosephosphate Dehydrogenase / Q000302:isolation & purification*; D011817:Rabbits
chemical_list: D015415:Biomarkers; D005954:Glucosephosphate Dehydrogenase
vernacular_title: Scelta della glucosio 6 fosfato deidrogenasi come marcatore di risoluzione nella separazione per età di eritroblasti di coniglio.