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. 1995 Nov;40(6):383–389. doi: 10.1007/BF01525389

A rat monoclonal anti-(human CD2) andL-leucine methyl ester impacts on human/SCID mouse graft and B lymphoproliferative syndrome

Fataki Bombil 1,✉, Jean Pierre Kints 1, Xavier Havaux 1, Jean Marie Scheiff 2, Hervé Bazin 1, Dominique Latinne 3
PMCID: PMC11037751  PMID: 7627995

Abstract

The transfer of human peripheral blood mononuclear cells (hu-PBMC) from adult Epstein-Barrvirus(EBV)-seropositive honors in SCID (severe combined immunodeficiency) mice frequently leads to the development of a human B lymphoproliferative syndrome (hu-BLPS). Therefore, as 90% of adult potential donors are EBV-seropositive, efforts have to be made to avoid the occurrence of this B lymphoproliferative disorder. McCune et al. [Science 241;1632 (1988)] used human fetal organs for a human SCID graft. This system does not give rise to hu-BLPS but human fetal organs are much less available than peripheral blood leucocytes. The experiments reported in this paper show how crucial is the presence offunctional T lymphocytes for a graft to take and for development of hu-BLPS in hu-PBMC-reconstituted SCID mice, since inhibition of T lymphocyte by a rat anti-(human CD2) monoclonal antibody (LO-CD2a) during the first 10 days of the graft prevents successful engraftment of human normal lymphocytes as well as hu-BLPS in SCID mice. The transfer of B cells alone or B cells plus monocytes in SCID mice does not permit either long-term engraftment or development of hu-BLPS. We also demonstrate that hu-PBMC treated withL-leucine methyl ester are less susceptible to the development of hu-BLPS after engraftment in SCID mice than are untreated hu-PBMC. The mechanism of action ofL-leucine methyl ester on these cells is discussed.

Key words: Human-SCID mice, B lymphoproliferative syndrome, T lymphocyte, LO-CD2a, L-Leucine methyl ester

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