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Exposure of the Bone Marrow Microenvironment to Simulated Solar and Galactic Cosmic Radiation Induces Biological Bystander Effects on Human Hematopoiesis

Journal Article · · Stem Cells and Development
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  1. Wake Forest Univ., Winston-Salem, NC (United States). School of Medicine and Inst. for Regenerative Medicine
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Biological, Environmental, and Climate Sciences Dept.
  3. Wake Forest Univ., Winston-Salem, NC (United States). Center for Public Health Genomics and Dept. of Biostatistical Sciences and Division of Public Health Sciences
  4. Univ. of California, Davis, CA (United States). Comprehensive Cancer Center and Dept. of Radiation Oncology
The stem cell compartment of the hematopoietic system constitutes one of the most radiosensitive tissues of the body and leukemias represent one of the most frequent radiogenic cancers with short latency periods. As such, leukemias may pose a particular threat to astronauts during prolonged space missions. Control of hematopoiesis is tightly governed by a specialized bone marrow (BM) microenvironment/niche. As such, any environmental insult that damages cells of this niche would be expected to produce pronounced effects on the types and functionality of hematopoietic/immune cells generated. We recently reported that direct exposure of human HSC to simulated SEP and GCR radiation dramatically altered the differentiative potential of these cells, and that simulated GCR exposures can directly induce DNA damage and mutations within human HSC, which led to leukemic transformation when these cells repopulated murine recipients. In the present study, we performed the first in depth examination to define changes that occur in mesenchymal stem cells (MSC) present in the human BM niche following exposure to accelerated protons and iron ions, and assess the impact these changes have upon human hematopoiesis. Here, our data thus provides compelling evidence that simulated SEP/GCR exposures can also contribute to defective hematopoiesis/immunity through so-called “biological bystander effects” by damaging the stromal cells that comprise the human marrow microenvironment, thereby altering their ability to support normal hematopoiesis.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1430862
Report Number(s):
BNL--203398-2018-JAAM
Journal Information:
Stem Cells and Development, Journal Name: Stem Cells and Development Journal Issue: 18 Vol. 27; ISSN 1547-3287
Publisher:
Mary Ann Liebert, Inc.Copyright Statement
Country of Publication:
United States
Language:
English

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