Abstract:
:C57BL/6 mice can generate a type-specific and class IH-2Kb-restricted CTL response against histocompatible AKR/Gross murine leukemia virus (MuLV) cell surface antigen positive (GCSA+) tumor cells. These anti-AKR/Gross MuLV CTL are also known to lyse SC.Kb/623 target cells expressing the molecular MuLV clone AKR623 (derived from the endogenous ecotropic MuLV provirus emv-11). To help identify AKR623 viral epitopes recognized by these CTL, four chimeric proviruses were constructed from two parental plasmids, pAKR623 and pAK7. It has been shown that SC.Kb/7 fibroblast targets expressing the emv-14-derived molecular clone AK7 are only poorly lysed by anti-AKR/Gross MuLV CTL. Data from experiments employing SC.Kb cells infected with the chimeras as targets against anti-AKR/Gross MuLV CTL supported the location of a previously identified immunodominant epitope located within the viral p15E transmembrane envelope protein, peptide TM134-141 (KSP-WFTTL). Furthermore, the use of Kb-motif-defined AKR623 encoded peptides together with data obtained using the chimeric viruses allowed the identification of three additional anti-AKR/Gross MuLV CTL epitopes. Peptides representing these epitopes, MA125-132 (RSALY-PAL), RT142-149 (SHRWYTVL), and RT456-463 (RMTHYQAM), are characterized herein with respect to their ability to confer lysis upon EMV- target cells and to stimulate tumor primed splenocytes in vitro. The identification and characterization of these additional epitopes allow for a better understanding of both the CTL response against GCSA+ tumor cells and the dysfunctional CTL response against EMV-14 and AK7.
journal_name
Viral Immunoljournal_title
Viral immunologyauthors
White HD,Roeder DA,Lam T,Green WRdoi
10.1089/vim.1994.7.51subject
Has Abstractpub_date
1994-01-01 00:00:00pages
51-9issue
2eissn
0882-8245issn
1557-8976journal_volume
7pub_type
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