Rearrangement and expression of T-cell receptor genes in marmoset lymphoid cell lines with natural killer activity
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1Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha.
Abstract:
To study the role of the T-3/T-cell receptor complex in mediating natural killer activity, we have examined T-cell receptor gene configuration and expression in five transformed marmoset cell lines with natural killer activity. All lines showed rearrangement of the beta chain of the T-cell receptor and expressed full size beta chain transcripts as well as full size delta chain transcripts. Only three lines contained full size T-cell receptor alpha chain transcripts. Of the three lines which had potential for encoding functional T-3/T-cell receptor complex, those which possessed natural killer activity also expressed T-gamma transcripts. In addition, one clone with high natural killer activity which did express high levels of T-gamma mRNA was unable to produce functional T-3/T-cell receptor complex due to truncated T-cell receptor alpha chain message. The results in this paper provide strong evidence that natural killer activity is dependent upon expression of the T-cell receptor gamma chain.
Insights
Natural killer (NK) cell activity relies on the T-cell receptor (TCR) gamma chain. This study found that NK activity in marmoset cell lines correlated with TCR gamma chain expression, highlighting its crucial role.
Area of Science:
- Immunology
- Cell Biology
Background:
- The T-cell receptor (TCR) complex, including T-3 and its associated chains (alpha, beta, gamma, delta), plays a critical role in adaptive immunity.
- Natural killer (NK) cells are lymphocytes crucial for innate immunity, but their precise interaction with TCR components is not fully understood.
Purpose of the Study:
- To investigate the role of the T-cell receptor (TCR) complex in mediating natural killer (NK) cell activity.
- To examine the relationship between TCR gene configuration, expression, and NK cell function in marmoset cell lines.
Main Methods:
- Analysis of T-cell receptor (TCR) gene rearrangement and transcript expression (alpha, beta, gamma, delta chains) in five transformed marmoset cell lines.
- Assessment of natural killer (NK) activity in these cell lines.
- Correlation of NK activity with the presence and expression levels of TCR components.
Main Results:
- All examined marmoset cell lines exhibited TCR beta chain rearrangement and expressed beta and delta chain transcripts.
- Only three cell lines possessed full-size TCR alpha chain transcripts, indicating potential for a functional TCR complex.
- Cell lines with NK activity also expressed TCR gamma (T-gamma) transcripts.
- One clone with high NK activity showed high T-gamma mRNA but lacked a functional TCR complex due to a truncated TCR alpha chain message.
Conclusions:
- Natural killer (NK) cell activity is strongly dependent on the expression of the T-cell receptor (TCR) gamma chain.
- The TCR gamma chain is a critical mediator of NK cell function, even in the absence of a complete, functional TCR complex.