title: Intra-bone marrow-bone marrow transplantation facilitates hemopoietic recovery including dendritic cells.
abstract: In this report, we provide evidence using a serial bone marrow transplantation (BMT) protocol that intra-bone marrow (IBM)-BMT (IBM-BMT) can efficiently reconstitute the hemopoietic system with cells of donor origin, in contrast to conventional intravenous (IV)-BMT (IV-BMT). Furthermore, the hematolymphoid system of secondary recipients that had received bone marrow cells (BMCs) from primary recipients treated with IBM-BMT recovered earlier than that of the secondary recipients of BMCs from primary recipients treated with IV-BMT. This was the case when the Lin-/c-kit+ progenitor cells of the secondary and tertiary recipients were examined. These findings indicate that IBM-BMT can facilitate the development of not only cells of various lineages but also the effective generation and, more importantly, the maintenance of the progenitor cells. Furthermore, we show that IBM-BMT can reconstitute the dendritic cell (DC) subsets (myeloid and lymphoid DCs), which are critical for the initiation of both adaptive and innate immune responses. The frequency of both myeloid and lymphoid DC subsets was approximately equal to that of normal age-matched untreated controls and, after second and third BMT, this ratio was close to that observed in the normal controls. However, the lymphoid DCs were clearly reduced in the secondary and tertiary recipients of BMCs from mice that had received IV-BMT. Therefore, the development of DC subsets is also normally maintained in the IBM-BMT group.
authors.affiliation: First Department of Pathology, Kansai Medical University, Moriguchi City, Osaka, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Baba
authors.forename: Muneo
authors.initials: M
authors.lastname: Inaba
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Iwai
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Taira
authors.forename: Keizo
authors.initials: K
authors.lastname: Takada
authors.forename: Hiroko
authors.initials: H
authors.lastname: Hisha
authors.forename: Toshio
authors.initials: T
authors.lastname: Yamashita
authors.forename: Susumu
authors.initials: S
authors.lastname: Ikehara
mesh_terms: D000818:Animals; D016026:Bone Marrow Transplantation / Q000379:methods / Q000502:physiology*; D003713:Dendritic Cells / Q000166:cytology*; D006086:Graft vs Host Disease / Q000276:immunology; D006412:Hematopoietic Stem Cells / Q000502:physiology; D051379:Mice; D020297:Mice, Congenic; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D013154:Spleen / Q000166:cytology; D019172:Transplantation Conditioning