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. 1993 Mar;36(2):83–88. doi: 10.1007/BF01754406

Recognition of the Qa-2k tumor antigen by T cell receptor γ/δ of an immunopotentiator-induced tumoricidal T cell of mice

Takahiro Okazaki 1, Chiemi Nakanishi-Ito 1, Naohiro Seo 1, Takae Tanino 1, Masafumi Takiguchi 1, Kohji Egawa 1,✉
PMCID: PMC11038822  PMID: 8425212

Abstract

Tumor-specific expression of Qa-2k antigen coded by the Q5k gene on various mouse tumor cells and immunological response of the host mice to the antigen have been demonstrated [Seo et al. (1992) J Exp Med 175: 547; Tanino et al. (1992) Cancer Immunol Immunother 35: 230]. The possibility was examined that Qa-2 antigen is one of the recognition target molecules of immunopotentiator-induced, H-2-nonrestricted tumoricidal lymphocytes of Qa-2− mice. Lymphocytes stimulated in vivo withP. acnes or culture-induced anomalous killers of B6.K1 mice did not exhibit significant in vitro cytotoxicity against B6.K1 lymphoblasts but lysed their Qa-2,3-congenic counterpart B6 lymphoblasts. To demonstrate the Qa-2 specificity of such cytotoxic cells more precisely, an L cell transformant clone (LQ7b/Kb), which expressed the α1 and α2 domains of the Qa-2 antigen (Q7b gene product), was generated by transfecting a cloned plasmid DNA containing a hybrid gene constructed from the 5′ half of the Q7b gene and the 3′ half of the H-2Kb gene (pQ7b/Kb). Using LQ7b/Kb cells as the target cells and the nylon-wool-nonadherent fraction of lymphocytes fromP. acnes-stimulated (C3H/He × B6.K1)F1 mice (H-2k, Qa-2−) as the effector cells of the in vitro cytotoxicity reaction, the presence of cytotoxic cells that recognize the α1/α2 region of the Q7b gene product was demonstrated. The cytotoxic activity was dependent on T cells bearing T cell receptors of the γ/δ type (TCRγ/δ). The (C3H/He × B6.K1)F1 effector cells, as well as the B6.K1 effector cells also lysed BW5147 lymphoma cells (Qa-2k+) derived from AKR mice (Qa-2−, H-2k). By target-competition experiments it was shown that some of the effector cells lytic to BW5147 were identical to those that lysed LQ7b/Kb. Therefore some of the tumoricidal cells induced by the immunopotentiator interact with the target tumor cells through recognition of the α1/α2 region of the Qa-2k tumor antigen by TCRγ/δ.

Key words: Qa-2, TCRγ/δ, Anomalous killer, Immunopotentiator

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