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In vitro thymocyte differentiation in MHC class I-negative Xenopus larvae.

J Robert1, M Sung, N Cohen

  • 1Department of Microbiology and Immunology, University of Rochester Medical Center, Box 672, 601 Elmwood Avenue, Rochester, NY 14642, USA. robert@uhura.cc.rochester.edu

Developmental and Comparative Immunology
|March 14, 2001
PubMed
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Immune cells called thymocytes in Xenopus tadpoles can mature into T-lymphoblasts when exposed to specific compounds. This process involves changes in gene expression and cell surface markers, revealing distinct T-lymphoblast subsets.

Area of Science:

  • Immunology
  • Developmental Biology
  • Xenopus Research

Background:

  • CTX is a surface antigen found on immature thymocytes in Xenopus, primarily MHC class I-negative cortical thymocytes.
  • In adult Xenopus, CTX(+) thymocytes (MHC class I(-) CD8(+)) are analogous to mammalian CD4CD8 double-positive thymocytes.

Purpose of the Study:

  • To investigate the differentiation of immature Xenopus thymocytes upon stimulation.
  • To characterize the molecular and phenotypic changes during T-lymphoblast development in Xenopus.

Main Methods:

  • Exposure of immature CTX(+) thymocytes from MHC class I-negative tadpoles to phorbol ester (PMA) and ionomycin in vitro.
  • Analysis of surface marker expression (CD5, CD45, CTX, MHC class I/II) and gene expression (CTX, Rag 1, TdT, TCR-beta).

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Main Results:

  • PMA/ionomycin treatment induced differentiation of CTX(+) thymocytes into T-lymphoblasts expressing high CD5 and CD45.
  • Differentiated T-lymphoblasts downregulated CTX, Rag 1, and TdT genes, while TCR-beta remained transcribed.
  • Signaling modulated MHC class I and class II expression, and revealed two larval T-lymphoblast subsets: CD5(high)CD8(-) and CD5(high)CD8(high).

Conclusions:

  • Transient in vitro stimulation can drive Xenopus thymocyte differentiation into mature T-lymphoblasts.
  • This process involves significant changes in gene and surface marker expression, defining distinct T-lymphoblast populations.