Ikemoto T, Tashiro S, Yasutomo K, Kishihara K, Kurita N, Miyake H. Donor-specific tolerance induced by simultaneous allogeneic islet transplantation with CD4+CD25+T-cells into hepatic parenchyma in mice.
THE JOURNAL OF MEDICAL INVESTIGATION 2004;
51:178-85. [PMID:
15460904 DOI:
10.2152/jmi.51.178]
[Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND
The allogeneic islets transplantation is an ideal therapeutic strategy for patients with diabetes mellitus. However, it has been difficult to induce immunological tolerance against islets grafts. The CD4+CD25+ regulatory T-cells (Treg) play a role in suppressing T-cell activation. Thus, we evaluated whether Treg can regulate donor-specific T-cell tolerance that received allogeneic islets into the hepatic parenchyma (ITxHP) along with Treg.
METHODS
C3H/He mice were used as donors; and streptozotocin-induced diabetic BALB/c mice were recipients. The protocol included three groups: Group A recipients received only 300 IE islets; Group B was given 300 IE islets and whole splenocytes; Group C was given 300 IE islets and Treg purified from peripheral lymph nodes.
RESULTS
For all mice in Groups A and B, the fasting blood sugar exceeded 250mg/dl and graft rejection was observed. GVHD was observed earlier in Group B than in Group A. In contrast graft survival exceeded 30 days for two mice in Group C (50%, mean POD 28.5 +/- 24.0, P<0.05). Mixed lymphocyte reaction showed that T-cells from tolerant mice had very weak responses against spleen cells from C3H mice.
CONCLUSIONS
The simultaneous ITxHP with CD4+CD25+ T-cells administration prolonged islet graft survivals and induced donor-specific hyporesponsiveness.
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