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. 1990 Aug;87(15):5973–5977. doi: 10.1073/pnas.87.15.5973

Maturation or differentiation of human thymocyte precursors in vitro?

V Groh 1, M Fabbi 1, J L Strominger 1
PMCID: PMC54452  PMID: 2377624

Abstract

The differentiation or maturation potential of human thymocyte precursors has been studied by using a population of CD3/TCR-, CD4-, CD8- ("triple negative") thymocytes isolated by negative selection (TCR, T-cell receptor). This cell population, however, also contained 30-50% previously undescribed cells expressing very low levels of CD3/TCR gamma delta (CD3/TCR gamma delta low; approximately 60% of which expressed the variable region gene V delta 1). Correspondingly, TCR gamma and TCR delta gene rearrangements (predominantly V delta 1/joining region J delta 1) and full-length TCR gamma and TCR delta transcripts (but only immature TCR beta and no TCR alpha mRNAs) were found. These cells mobilized Ca2+ in response to ligation of CD3 but not following ligation of TCR gamma delta. When cultured in the presence of interleukin 7 or interleukin 2, these thymocytes gave rise to 30-60% CD3/TCR gamma delta medium and high cells (60-70% expressing V delta 1) seen as discrete populations. Thus, the proportion and V delta phenotype of in vitro generated CD3/TCR gamma delta cells closely resembled those of CD3/TCR gamma delta low cells in freshly isolated "thymocyte precursor" preparations. Small numbers of TCR alpha beta + cells also appeared. It is thus uncertain whether maturation, differentiation, or both account for the appearance of mature CD3/TCR+ thymocytes, although the former appears most likely.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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