HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Grimm, E. A. Articles by Bonavida, B. Search for Related Content PubMed Articles by Grimm, E. A. Articles by Bonavida, B.

Studies on the Induction and Expression of T Cell-Mediated Immunity

IX. Activation of Alloimmune Memory Lymphocytes Into Specific Secondary CTL by Syngeneic NAGO-Oxidized Stimulator Cells¹

From the Department of Microbiology and Immunology, UCLA School of Medicine, Los Angeles, California 90024

Abstract

Secondary cytotoxic thymus-derived lymphocytes (CTL) with specificity for the priming alloantigen are shown to be generated by in vitro stimulation of allosensitized memory splenocytes with NAGO-oxidized syngeneic, allogeneic, or xenogeneic cells. The cell surface aldehyde resulting from NAGO modification of stimulator cells is required for triggering both lymphocyte proliferation and secondary (2°) CTL activation, since treatment with the reducing agent, KBH₄, completely inhibited these responses. Compared to alloantigen stimulation, NAGO-oxidized stimulator cells induced an earlier peak of proliferation (2 to 3 vs 4 to 5 days), whereas the peak of the cytotoxic activity was identical (days 3 to 4).

Syngeneic splenocytes, peripheral T cells, plastic and nylon nonadherent cells, and the P388D₁ macrophagelike cell line were all efficient stimulators after NAGO modification. Stimulation by syngeneic cells was shown to be mitomycin C resistant, U.V. irradiation sensitive, and ineffective when heat killed cells are used. Therefore, NAGO stimulation is distinct from antigen specific activation whereby U.V. treated cells, heated cells and nonviable membrane fragments have been shown to differentiate memory cells into 2° CTL. In addition, neither NAGO-treated sheep red blood cells nor syngeneic thymocytes were found to be effective stimulators. The addition of specific anti-Ia serum to the culture fluid inhibited both the proliferative and cytotoxic response, suggesting a role for an Ia signal during NAGO stimulation. These results show that the signal(s) required for the activation of 2° CTL from memory populations can be provided by certain subpopulations of NAGO-modified cells and is also dependent on the presence of Ia or an Ia-like molecule.

Footnotes

¹ This work was supported by Grant CA 12800 awarded by the National Cancer Institute, Department of Health, Education and Welfare, and in part by a grant from the California Institute for Cancer Research.

² E. Grimm was the recipient of a Training Grant number T32 Ca-09120, National Cancer Institute, Department of Health, Education and Welfare.