Study on the Effect of Space Environment to Embryonic Stem Cells to Their Development (Stem Cells) - 05.25.16
Stem Cells is an investigation that uses embryonic mouse stem cells to study the effects of the space environment on their DNA, chromosomes, and on their development into adult mice after return to Earth. Frozen stem cells are placed in the Kibo module for periods ranging from 6 to 36 months, and then returned to Earth where scientists microinject them into 8-cell mouse embryos that are implanted into female mice. Investigators also look for double-strand DNA breaks and chromosome aberrations caused from exposure to space radiation. Science Results for Everyone
Information Pending Experiment Details
OpNom: Stem Cells
Takashi Morita, Osaka City University, Osaka, Japan
Kayo Yoshida, Osaka City University, Osaka, Japan
Shuhei Yoshida, Osaka City University, Japan
Francis A. Cucinotta, Ph.D., University of Nevada, Las Vegas, NV, United States
Megumi Hada, Johnson Space Center, Houston, TX, United States
Kiyomi Eguchi-Kasai, NIRS, Japan
Japan Aerospace Exploration Agency, Space Environment Utilization Center, Tsukuba, Japan
Sponsoring Space Agency
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency
ISS Expedition Duration 1
September 2012 - March 2016; March 2016 - September 2016; March 2017 - September 2017
- Space contains higher levels of cosmic radiation, including Galactic Cosmic Rays (GCR) and Solar Particle Events (SPE). Therefore,it is extremely important to estimate their effects on organisms in order to predict and develop countermeasures for the human body to protect against those influences. In the future, there is a great possibility of reproduction and development in space, and these radiation events can pose serious problems during a long duration stay in space.
- The survival ratios of Embryonic Stem (ES) cells to space radiation are analyzed using colony formation. At the same time, researchers can also detect DNA double-strand breaks, and chromosome aberrations of ES cells can be assessed using antibodies against the phosphorylated histone, H2AX, and in situ hybridization techniques. From these experiments researchers can estimate the extent of space radiation onboard ISS. The ES cells are microinjected and cultured in vitro, and their development can be followed by time-lapse microscopy. The surviving chimeric embryos are implanted into a pseudo-pregnant mouse uterus, and their birth is examined. From these experiments, researchers are able to detect the influence of space radiation through subsequent generations.
Data obtained from the mouse ES cells is extrapolated to human cells and embryos, and can be used for studying the protection of the human body for long duration missions in space.
With the completion of the Japanese Experiment Module “Kibo”, long duration manned missions on board the International Space Station are now a reality. The space environment contains many types of ionizing radiation, so it is extremely important to estimate the effects of radiation on organisms in order to predict and develop countermeasures for the human body from those influences. Also, these radiation events could pose problems for future reproduction and development in organisms during long duration missions in space.
Because it is difficult to breed animals in space to examine the influence of space radiation and micro-gravity for long periods of time, this experiment exposes ES cells to the space environment and studies the effects. The ES cells for this experiment are frozen on Earth, and stored in a dedicated Stem Cell Sample Case, with a Bio Dosimeter to measure radiation. After the ES cells are returned to the ground, the survival rate of the ES cells exposed to space radiation is analyzed using colony formation. Also, researchers are able to also detect DNA double-strand breaks and chromosome aberrations in the ES cells, and also quantify the cells after exposure to space radiation. Analysis techniques include using antibodies against phosphorylated H2AX histone, and in situ hybridization techniques. From these experiments researchers can estimate the extent of space radiation on board ISS.
Later, the ES cells are microinjected, cultured in vitro, and their development followed by time-lapse microscopy. The surviving chimeric embryos are then implanted into a pseudo-pregnant mouse uterus and their birth examined. From these experiments, the influence of the space radiation through subsequent generations can be assessed.
The space environment poses severe radiation hazards from galactic cosmic rays, solar energetic particles, and other sources, including secondary neutrons from the body itself. Results from the Stem Cells investigation can help scientists understand extent of influence to the human body and its development, as well as mechanisms of DNA repair, in humans and other animals, against space radiation.
Radiation also is a low-level hazard on Earth from natural and manmade sources. Results from the Stem Cells investigation can help scientists assess the safety of human body to such hazards, and also that of long-term management and conservation of stem cells in regenerative medicine.
Operational Requirements and Protocols
Decadal Survey Recommendations
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Stem Cells Sample Case. Image courtesy of JAXA.
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A “Stem Cells Sample Case” in a mock up of MELFI 1/2 box module. Image courtesy of JAXA.
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Cryo tubes in the Case. Image courtesy of JAXA.
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