title: Intra-bone marrow injection of donor bone marrow cells suspended in collagen gel retains injected cells in bone marrow, resulting in rapid hemopoietic recovery in mice.
abstract: We have recently developed an innovative bone marrow transplantation (BMT) method, intra-bone marrow (IBM)-BMT, in which donor bone marrow cells (BMCs) are injected directly into the recipient bone marrow (BM), resulting in the rapid recovery of donor hemopoiesis and permitting a reduction in radiation doses as a pretreatment for BMT. However, even with this IBM injection, some of the injected BMCs were found to enter into circulation. Therefore, we attempted to modify the method to allow the efficient retention of injected BMCs in the donor BM. The BMCs of enhanced green fluorescent protein transgenic mice (C57BL/6 background) were suspended in collagen gel (CG) or phosphate-buffered saline (PBS), and these cells were then injected into the BM of irradiated C57BL/6 mice. The numbers of retained donor cells in the injected BM, the day 12 colony-forming units of spleen (CFU-S) counts, and the reconstitution of donor cells after IBM-BMT were compared between the CG and PBS groups. The number of transplanted cells detected in the injected BM in the CG group was significantly higher than that in the PBS group. We next carried out CFU-S assays. The spleens of mice in the CG group showed heavier spleen weight and considerably higher CFU-S counts than in the PBS group. Excellent reconstitution of donor hemopoietic cells in the CG group was observed in the long term (>100 days). These results suggest that the IBM injection of BMCs suspended in CG is superior to the injection of BMCs suspended in PBS.
authors.affiliation: First Department of Pathology, Kansai Medical University, 10-15 Fumizono-cho, Moriguchi City, Japan.
authors.forename: Ming
authors.initials: M
authors.lastname: Shi
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Adachi
authors.forename: Akio
authors.initials: A
authors.lastname: Shigematsu
authors.forename: Naoko
authors.initials: N
authors.lastname: Koike-Kiriyama
authors.forename: Wei
authors.initials: W
authors.lastname: Feng
authors.forename: Seji
authors.initials: S
authors.lastname: Yanai
authors.forename: Cui
authors.initials: C
authors.lastname: Yunze
authors.forename: Zhe-Xiong
authors.initials: ZX
authors.lastname: Lian
authors.forename: Juan
authors.initials: J
authors.lastname: Li
authors.forename: Susumu
authors.initials: S
authors.lastname: Ikehara
mesh_terms: D000818:Animals; D001853:Bone Marrow; D001854:Bone Marrow Cells / Q000166:cytology*; D016026:Bone Marrow Transplantation / Q000379:methods*; D003094:Collagen; D003114:Colony-Forming Units Assay; D007267:Injections; D051379:Mice; D008810:Mice, Inbred C57BL; D013154:Spleen / Q000166:cytology; D014916:Whole-Body Irradiation
chemical_list: D003094:Collagen