TY - JOUR
T1 - Synthesis of chicken hemoglobins during erythrocyte differentiation
AU - Kabat, David
AU - Attardi, Giuseppe
N1 - Funding Information:
These investigations were supported by a grant from the National Institutes of Health (GM-II726). One of the authors (D. K.) is a Predoctoral Fellow of the National Science Foundation. The valuable assistance of Mrs. LAVERNE WENZEL is gratefully acknowledged.
PY - 1967/4/18
Y1 - 1967/4/18
N2 - 1. Nucleated avian erythrocytes have been fractionated on the basis of buoyant density in linear bovine serum albumin density gradients. An inverse relationship has been observed between cell buoyant density, on the one side, and average RNA content, RNA- and protein-synthesizing activity of chicken and duck erythrocytes, on the other. From the known relationship between these biochemical parameters and the erythrocyte maturation process, and from the autoradiographic analysis of the distribution of protein-synthesizing activity in the erythrocyte population, it is concluded that buoyant-density centrifugation in bovine serum albumin gradients separates bird erythrocytes of increasing degree of maturity from the top to the bottom of the gradient. 2. The synthesis of the two chicken hemoglobins appears to occur at high rate in the cells at relatively early stages of maturation present in the blood from anemic animals, and declines progressively in the late stages. On the contrary, the ratio of the rates of synthesis of the two hemoglobin components remains constant in all developmental stages. This suggests that the factors involved in the regulation of synthesis of the two proteins operate in a coordinate manner throughout cell development. 3. Actinomycin D has no significant influence on the formation of either hemoglobin by erythrocytes from anemic chickens during a 24-h incubation in vitro.
AB - 1. Nucleated avian erythrocytes have been fractionated on the basis of buoyant density in linear bovine serum albumin density gradients. An inverse relationship has been observed between cell buoyant density, on the one side, and average RNA content, RNA- and protein-synthesizing activity of chicken and duck erythrocytes, on the other. From the known relationship between these biochemical parameters and the erythrocyte maturation process, and from the autoradiographic analysis of the distribution of protein-synthesizing activity in the erythrocyte population, it is concluded that buoyant-density centrifugation in bovine serum albumin gradients separates bird erythrocytes of increasing degree of maturity from the top to the bottom of the gradient. 2. The synthesis of the two chicken hemoglobins appears to occur at high rate in the cells at relatively early stages of maturation present in the blood from anemic animals, and declines progressively in the late stages. On the contrary, the ratio of the rates of synthesis of the two hemoglobin components remains constant in all developmental stages. This suggests that the factors involved in the regulation of synthesis of the two proteins operate in a coordinate manner throughout cell development. 3. Actinomycin D has no significant influence on the formation of either hemoglobin by erythrocytes from anemic chickens during a 24-h incubation in vitro.
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U2 - 10.1016/0005-2787(67)90498-4
DO - 10.1016/0005-2787(67)90498-4
M3 - Article
C2 - 6048834
AN - SCOPUS:0014210238
SN - 0005-2787
VL - 138
SP - 382
EP - 399
JO - BBA Section Nucleic Acids And Protein Synthesis
JF - BBA Section Nucleic Acids And Protein Synthesis
IS - 2
ER -