NTP pattern of avian embryonic red cells: role of RNA degradation and AMP deaminase/5'-nucleotidase activity

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
R BaumannS Dragon

Abstract

During terminal erythroid differentiation, degradation of RNA is a potential source for nucleotide triphosphates (NTPs) that act as allosteric effectors of hemoglobin. In this investigation, we assessed the developmental profile of RNA and purine/pyrimidine trinucleotides in circulating embryonic chick red blood cells (RBC). Extensive changes of the NTP pattern are observed which differ significantly from what is observed for adult RBC. The biochemical mechanisms have not been identified yet. Therefore, we studied the role of AMP deaminase and IMP/GMP 5'-nucleotidase, which are key enzymes for the regulation of the purine nucleotide pool. Finally, we tested the effect of major NTPs on the oxygen affinity of embryonic/adult hemoglobin. The results are as follows. 1) Together with ATP, UTP and CTP serve as allosteric effectors of hemoglobin. 2) Degradation of erythroid RNA is apparently a major source for NTPs. 3) Developmental changes of nucleotide content depend on the activities of key enzymes (AMP deaminase, IMP/GMP 5'-nucleotidase, and pyrimidine 5'-nucleotidase). 4) Oxygen-dependent hormonal regulation of AMP deaminase adjusts the red cell ATP concentration and therefore the hemoglobin oxygen affinity.

References

Jun 20, 2007·Biochemical and Biophysical Research Communications·Simone K SteinerS Dragon
Nov 12, 2005·European Journal of Clinical Investigation·R Baumann, S Dragon
Jun 30, 2017·Frontiers in Immunology·Sameer A Barghouthi

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Related Concepts

Hormone Regulation
Embryo
RNA Degradation
Enzymes, antithrombotic
Biochemical Mechanism
Purine Nucleotides
Red blood cells, blood product
Senility
Hyperoxia
Cell Differentiation Process

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