Abstract:
:The results of previous studies indicate that only CD4+ T cells generated via the indirect pathway play an essential role in causing discordant skin xenograft rejection. The present study was conducted in an attempt to clarify further the roles of effector T cells generated via direct pathways on discordant xenograft rejection using CD45 exon-6 knockout (CD45-/-; C57BL/6 (B6): H-2b) mice. It has been strongly suggested that CD45 exon-6 knockout mice have profound impairment in T-cell functions via an indirect pathway. When human skin was grafted onto untreated normal C57BL/6 (B6; H-2b) mice, rejection occurred within 12 days; however, in the CD45 exon-6 knockout mice, the grafts lasted for slightly longer as in fully allogeneic C3H (H-2k) skin rejection, with a mean survival time +/- SD of 19.4 +/- 1.5 days and median survival times of 19 days. The difference in survival periods between the human and C3H skin grafts in the CD45 knockout mice was not statistically significant. Both CD4+ and CD8+ T cells seemed activated in the spleens of these CD45 exon-6 knockout mice 10 days after the human skin grafting. These results suggest that effector T cells generated via a direct pathway can cause discordant skin xenograft rejection, and that CD45 exon-6 knockout mice can generate effector T cells via a direct pathway to reject discordant skin xenografts, similarly to fully allogeneic skin allografts.
journal_name
Surg Todayjournal_title
Surgery todayauthors
Tomita Y,Uchida T,Zhang QW,Shimizu I,Iwai T,Yoshikawa M,Kishihara K,Nomoto K,Yasui Hdoi
10.1007/s005950070064subject
Has Abstractpub_date
2000-01-01 00:00:00pages
816-20issue
9eissn
0941-1291issn
1436-2813pii
10.1007/s005950070064journal_volume
30pub_type
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