The Osaka City University and the Japan Aerospace Research and Development Agency announced that they are preparing to freeze the embryonic stem cells of experimental rats in the "Hope" experimental capsule of the International Space Station in Japan for half a year to 3 years to study the effects of space radiation on cells.
Cosmic rays composed of protons and heavy ions are interwoven in space, and the radiation of the International Space Station is about 100 times higher than that of the ground. Many rays can affect living things, and some can even cut DNA in cells.
According to the Japanese research institute's plan, 500 test tubes containing embryonic stem cells will be sent to the US space exploration technology company's "Dragon" spacecraft, which was launched into orbit in March this year. The 500 test tubes will be kept in the freezer of the "Hope" experiment module, and 100 test tubes will be taken out at the nodes of half a year, one year, one and a half years, two years and three years and sent back to the earth.
After recovery, the researchers will thaw the embryonic stem cells, analyze the cell survival rate, DNA damage and chromosomal abnormalities, and then transplant the embryonic stem cells into fertilized eggs to confirm whether a small experimental mouse can be born, analyze whether the newborn individual is abnormal, and study radiation and cancer Relationship.
This experiment also helps predict the impact of human long-term stay in space. Osaka City University professor Morita Takashi pointed out: "It is very difficult to study the effects of cosmic rays on the ground. This experiment may help improve the method of resisting radiation."
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