Biochemical and functional characterization of xenoreactive natural antibodies in hu-PBL-SCID mice

Bashoo Naziruddin, Ryoichi Shiroki, Seiichiro Shishido, Todd Howard, T. Mohanakumar

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12 Citations (Scopus)


An in vivo model system to understand the mechanism of xenograft rejection was established using human peripheral blood leukocyte-reconstituted SCID (hu-PBL-SCID) mice. Human xenoreactive natural antibodies (XNA), of IgM and IgG subtypes, capable of binding to pig aortic endothelial cells (PAEC) were detected in the sera of hu-PBL-SCID by ELISA and flowcytometric methods. Western blot analysis of PAEC lysates showed that IgM and IgG XNA from hu- PBL-SCID recognized xenoantigens with similar molecular mass as those recognized by XNA from normal human serum (NHS). This result demonstrated that hu-PBL-SCID contained XNA representing the same repertoire as that of the NHS. XNA from NHS and hu-PBL-SCID were also able to induce intracellular Ca2+ signals in cultured PAEC several fold above the basal level. This result revealed their functional similarity and demonstrated for the first time that XNA in the absence of C can activate PAEC, which may lead to the pathology of xenograft rejection. In vivo, PAEC transplanted under the kidney capsule of hu-PBL-SCID mice showed deposition of human IgM and mouse C. In summary, the present study demonstrates that hu-PBL-SCID can serve as a useful model to characterize innate immunity against xenograft.

Original languageEnglish
Pages (from-to)1267-1275
Number of pages9
JournalJournal of Clinical Investigation
Issue number5
Publication statusPublished - 01-03-1996

All Science Journal Classification (ASJC) codes

  • Medicine(all)


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