MARROW: Keeping bones healthy in space
The Canadian experiment MARROW studies how bone marrow (the spongy tissue inside bones) and the blood cells it produces change in space.
During a space mission, the hard bones lose calcium and strength, but what happens to the bone marrow has never been measured. Experiments on Earth suggest fat cells in bone marrow may increase, leaving less room for the production of red and white blood cells.
A decrease in red blood cells can produce anemia, whose symptoms include physical limitations such as weakness, persistent fatigue, and slower brain function. With fewer white blood cells, the body becomes more vulnerable to infections and more sensitive to radiation exposure.
MARROW aims to:
- measure fat changes in the bone marrow before and after astronauts spend six months in microgravity
- determine whether the bone marrow changes are reversible
- track specific changes in red and white blood cell function before, during and after space flight
MARROW's findings will help ease the effects of physical inactivity on seniors, bedridden patients, and those with reduced mobility or undergoing rehabilitative treatment.
How it works
Thirteen astronauts are participating in this study.
- Before the astronauts leave Earth, researchers use magnetic resonance imaging (MRI) to establish the fat content in their bone marrow.
- The participants also give blood and breath samples before their flights to assess red and white blood cell function.
- On the International Space Station (ISS), astronauts repeat the same blood and breath samples.
- For up to a year after return, they undergo serial MRI scans. Comparing these images allows scientists to chart their recovery and track how much fat tissue has accumulated in the confined space inside the bones.
- A final set of blood and breath samples are tested and compared.
MARROW began collecting data in and is scheduled to complete its final tests in June 2020.
- Dr. Guy Trudel, University of Ottawa, Bone and Joint Research Laboratory
Co-investigators and employees
- Dr. Odette Laneuville, University of Ottawa
- Dr. Ian Cameron, The Ottawa Hospital
- Dr. Adnan Sheikh, The Ottawa Hospital
- Dr. Alain Stintzi, University of Ottawa
- Dr. Tim Ramsay, Ottawa Hospital Research Institute
- Hakim Louati, University of Ottawa
- Theresa Backlund, University of Ottawa
- Dr. Paola Sebastiani, Boston University
- How does radiation affect the human body in space?
- Immuno Profile
- Interview with Dr. Trudel and Dr. Laneuville about MARROW on NASA TV
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