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A New Method for Bone Marrow Cell Harvesting

^a First Department of Pathology,
^b Department of Orthopedic Surgery,
^c Transplantation Center, Kansai Medical University, Osaka, Japan;
^d The Corporation for Production and Research of Laboratory Primates, Ibaraki, Japan.

Key Words. Bone marrow transplantation • Cynomolgus • Bone marrow harvesting

Susumu Ikehara, M.D., Ph.D., First Department of Pathology, Transplantation Center, Kansai Medical University, 10-15 Fumizono-cho, Moriguchi City, Osaka 570-8506 Japan. Telephone: 81-6-6993-9429; Fax: 81-6-6994-8283; e-mail: ikehara{at}takii.kmu.ac.jp

To minimize contamination of bone marrow cells (BMCs) with T cells from the peripheral blood, a new "perfusion method" for collecting BMCs is proposed using cynomolgus monkeys. Two BM puncture needles are inserted into a long bone such as the humerus, femur, or tibia. One needle is connected to an extension tube and the end of the tube is inserted into a culture flask to collect the BM fluid. The other needle is connected to a syringe containing 30 ml of phosphate-buffered saline. The solution is pushed gently from the syringe into the medullary cavity, and the medium containing the BM fluid is collected into the culture flask. There is significantly less contamination with peripheral blood, determined from the frequencies of CD4⁺ and CD8⁺ T cells, when using this method (<6%) than when using the conventional method (>20%) consisting of multiple BM aspirations from the iliac crest. Furthermore, the number and progenitor activities of the cells harvested using this "perfusion method" are greater than those harvested using the conventional aspiration method. This perfusion method was carried out 42 times using 15 cynomolgus monkeys, and no complications such as pulmonary infarction or paralysis were observed. These findings suggest that the "perfusion method" is safe and simple and would be of great advantage in obtaining pure BMCs, resulting in a less frequent occurrence of acute graft-versus-host-disease in allogeneic BM transplantation.

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