Analysis of tolerance induction using triple chimeric mice: major histocompatibility complex-disparate thymus, hemopoietic cells, and microenvironment.
BACKGROUND
Although bone marrow transplantation (BMT) has become a valuable strategy for the treatment of various intractable diseases in recent years, success rates remain low in elderly patients because of low thymic function. We have previously shown that fetal thymus transplantation (TT) with BMT is effective for elderly recipients in mice.


METHODS
We performed fully major histocompatibility complex (MHC)-mismatched fetal TT from B6 (H-2) mice plus allogeneic BMT from C3H/HeN (H-2) mice by intra-bone marrow-BMT (IBM-BMT) using congenitally athymic nude (nu/nu) BALB/c (H-2), or BALB/c adult-thymectomized recipients to obtain triple chimeras. We next carried out the IBM-BMT+TT using senescence-accelerated mouse P1 strain (SAMP1) to examine whether this method would be applicable to aging mice.


RESULTS
Triple chimeric mice survived for a long period with sufficient T-cell functions comparable to the mice treated with BMT plus MHC-matched TT, whereas those without TT survived for a short period with insufficient T-cell reconstitution. Almost all the hematolymphoid cells were derived from donor bone marrow cells. Interestingly, they showed tolerance to all three types of MHC determinants with donor-derived thymic dendritic cells in TT. Triple chimeric SAMP1 also survived for long periods with T-cell functions restored in contrast to non-TT SAMP1 recipients.


CONCLUSIONS
These findings suggest that third party combined TT with allogeneic IBM-BMT may be more advantageous for elderly recipients with low thymic function, than IBM-BMT alone (without TT).
Cui
Wenhao
W
Department of Pathology, Kansai Medical University, Moriguchi, Osaka, Japan.
Hosaka
Naoki
N
Miyake
Takashi
T
Wang
Xiaoli
X
Guo
Kequan
K
Cui
Yunze
Y
Li
Qiang
Q
Song
Changye
C
Feng
Wei
W
Li
Qing
Q
Takaki
Takashi
T
Nishida
Teruhisa
T
Inaba
Muneo
M
Ikehara
Susumu
S
D000375:Aging; D000818:Animals; D016026:Bone Marrow Transplantation / Q000276:immunology*; D005260:Female; D006412:Hematopoietic Stem Cells / Q000502:physiology; D006649:Histocompatibility Antigens / Q000276:immunology*; D006650:Histocompatibility Testing; D007108:Immune Tolerance; D051379:Mice; D008815:Mice, Inbred Strains; D013154:Spleen / Q000276:immunology; D015996:Survival Rate; D013601:T-Lymphocytes / Q000276:immunology; D013950:Thymus Gland / Q000502:physiology / Q000637:transplantation*; D018183:Transplantation Chimera
D006649:Histocompatibility Antigens