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Active suppression of the allogeneic histo compatibility reactions during metamorphosis of the clawed toad xenopus


, : Active suppression of the allogeneic histo compatibility reactions during metamorphosis of the clawed toad xenopus. Differentiation 16(1): 1-8

Metamorphosis is a privileged period for the induction of tolerance to allografts. Transfers of lymphocytes from metamorphosing Xenopus into isogenic adults prevented the rejection of a skin graft differing from the adult host by minor histocompatibility antigens. This implies that active suppression is involved at one step of the induction of tolerance to the self-antigens that differentiate at the time of metamorphosis. The reciprocal experiments of preventing tolerance induction by transfer of normal adult cells into metamorphosing animals failed. Passive transfer of anti-graft immunity in tolerant animals was partially observed, provided that a transfer of primed cells was done simultaneously with the challenging graft. Memory cells are not as sensitive to the suppression as are the cells that respond in a first set reaction.

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Other references

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