Yamaguchi M, Ebina S, Kashiwakura I. Involvement of placental/umbilical cord blood acid-base status and gas values on the radiosensitivity of human fetal/neonatal hematopoietic stem/progenitor cells.
JOURNAL OF RADIATION RESEARCH 2013;
54:277-284. [PMID:
23263728 PMCID:
PMC3589944 DOI:
10.1093/jrr/rrs107]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2012] [Revised: 10/15/2012] [Accepted: 10/16/2012] [Indexed: 06/01/2023]
Abstract
Arterial cord blood (CB) acid-base status and gas values, such as pH, PCO2, PO2, HCO3(-)and base excess, provide useful information on the fetal and neonatal condition. However, it remains unknown whether these values affect the radiosensitivity of fetal/neonatal hematopoiesis. The present study evaluated the relationship between arterial CB acid-base status, gas values, and the radiosensitivity of CB hematopoietic stem/progenitor cells (HSPCs). A total of 25 CB units were collected. The arterial CB acid-base status and gas values were measured within 30 min of delivery. The CD34(+)HSPCs obtained from CB were exposed to 2 Gy X-irradiation, and then assayed for colony-forming unit-granulocyte-macrophage, burst-forming unit-erythroid (BFU-E), and colony-forming unit-granulocyte erythroid, macrophage and megakaryocyte cells. Acid-base status and gas values for PCO2and HCO3(-)showed a statistically significant negative correlation with the surviving fraction of BFU-E. In addition, a significant positive correlation was observed between gestational age and PCO2. Moreover, the surviving fraction of BFU-E showed a significant negative correlation with gestational age. Thus, HSPCs obtained from CB with high PCO2/HCO3(-)levels were sensitive to X-irradiation, which suggests that the status of arterial PCO2/HCO3(-)influences the radiosensitivity of fetal/neonatal hematopoiesis, especially erythropoiesis.
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