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Evolution of alloantibodies and suppressor cells in allografted mice treated for passive enhancement.

Abstract：

:The kinetics and quality of the alloimmune reaction were studied in CBA (H-2k) mice treated for passive enhancement of tumor allografts (Sa 1 indigenous of A/J (H-2a or H-2k/d) mice). Serum samples of treated animals were tested for their biological properties relevant to different antibody isotypes in vitro (hemagglutination, complement-dependent cytotoxicity, and anaphylaxis, i.e., mast cell degranulation involving all main Ig isotypes; IgM, IgG2, and IgG1, IgE, respectively) as well as in vivo (allograft enhancement). Spleen cells from these treated animals were examined for their capacity to interfere with the rejection of tumor allografts by adoptive transfers into syngeneic recipients. In vitro, 51Cr release cytolysis assays were performed in order to test their cytolytic and regulatory activities in comparison to rejecting control animals. It has been shown that: grafted mice, pretreated for passive enhancement, kept their grafts longer and synthetized anaphylactic antibodies (mainly IgG1) earlier and at higher titers than normal serum controls, which rejected the same Sa 1 allografts. Mice with enhanced tumors synthetized cytotoxic antibodies (mainly IgG2) later than rejecting controls. Serum samples from treated and control animals, harvested 10 days (early sera) and 30 days (late sera) after grafting, were injected with a "normal dose" (0.2 ml) and a "high" dose (0.4 ml) to new CBA recipients grafted with Sa 1. Early immune sera were only enhancing at high doses when derived from animals previously treated for enhancement (at the low dose both immune sera were enhancing). Late sera, presenting both complement-fixing, cytotoxic (predominantly IgG2), and IgG1 anaphylactic alloantibodies in the two groups, induced enhancement in all cases, but more strongly when derived from the group treated for Sa 1 enhancement. Adoptive transfer of spleen cells from animals treated for passive enhancement were able either to inhibit the accelerated rejection (Day 10) or to promote enhancement of Sa 1 allogeneic cells (Day 30) while similar cells taken (Day 10 and Day 30) from control graft-rejecting mice transferred accelerated rejection. Among the transferred T-cell sub-populations, the suppressive effect was mediated by Lyt 2 T cells. In vitro, these spleen cells showed a weaker cytolytic activity than those of allograft-rejecting mice. Moreover, they were able to regulate the cytolytic activity of cytotoxic effector cells from specifically immunized CBA mice.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Duc HT,Kinsky RG,Monnot P,Voisin GA

doi

10.1016/0008-8749(85)90306-5

subject

Has Abstract

pub_date

1985-10-01 00:00:00

pages

180-94

issue

1

eissn

0008-8749

issn

1090-2163

pii

0008-8749(85)90306-5

journal_volume

95

pub_type

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