Intrathymic administration of B cells induces prolonged survival of fully allogeneic cardiac grafts without prolonged deletion of donor-specific thymocytes

Masanori Niimi, Nick D. Jones, Octavio B. Pajaro, Peter J. Morris, Kathryn J. Wood

Research output: Contribution to journalArticle

13 Scopus citations


Intrathymic (IT) injection of alloantigen has been shown to induce unresponsiveness to allografts although the exact mechanisms of tolerance induction remains unclear. C57BL/10 (H2b) cardiac allografts were accepted in C3H/He (H2(k)) mice pretreated with IT inoculation of donor splenocytes (1 x 106) in combination with a depleting anti-CD4 monoclonal antibody 27 days before cardiac transplantation. To investigate which cell types were responsible for tolerance induction by IT injection of alloantigen, resting B (rB) cells or dendritic cells were used as the thymic inoculum instead of whole splenocytes. IT injection of rB cells induced indefinite graft prolongation in all recipients while only 20% of mice that had received IT injection of dendritic cells accepted grafts for over 100 days. In contrast, IT injection of dendritic cells resulted in significant deletion of donor-specific thymocytes whereas rB cells were relatively ineffective. IT deletion is not essential for the induction of tolerance by IT injection of rB cells; nondeletional mechanisms can be involved.

Original languageEnglish (US)
Pages (from-to)177-181
Number of pages5
JournalTransplant Immunology
Issue number3
StatePublished - Sep 1998


ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Transplantation

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