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T-cell receptor genes expression in B-cell leukaemias
1Istituto di Clinica Medica II, Università di Modena, Italy.
British Journal of Haematology
|July 1, 1989
Summary
Leukaemic B-cells express truncated T-cell receptor (TCR) beta messenger RNAs (mRNAs) without gene rearrangement, unlike myeloid leukaemias. TCR alpha mRNAs were also abnormal in B-cells but absent in myeloid leukaemias.
Area of Science:
- Immunology
- Molecular Biology
- Hematology
Background:
- Leukemias involve malignant cells of the blood and immune system.
- T-cell receptor (TCR) gene expression is crucial for T-cell development and function.
- Aberrant gene expression is a hallmark of leukemia.
Purpose of the Study:
- To investigate T-cell receptor (TCR) alpha, beta, and gamma chain gene expression in various types of leukemia.
- To identify differences in TCR gene expression between myeloid, T-cell, and B-cell leukemias.
- To explore the potential regulatory mechanisms of TCR gene transcription in leukemic cells.
Main Methods:
- Northern-blot analysis was used to detect messenger RNA (mRNA) expression.
- Primary cells from 36 leukemia patients were analyzed.
- Analysis included myeloid leukemias, T-cell leukemias, and B-lymphocyte differentiation stage leukemias.
Main Results:
- Truncated TCR beta mRNAs were found at high levels in B-cells, even without gene rearrangement.
- Abnormal-sized TCR alpha mRNAs were frequently detected in B-cells.
- TCR alpha and beta transcripts were not found in myeloid leukemia cells.
- TCR gamma gene expression was undetectable in both B-lineage and myeloid leukemias.
Conclusions:
- Leukaemic B-cells can transcribe TCR alpha and beta genes, producing abnormal transcripts, suggesting active regulatory factors.
- Myeloid leukemic cells do not express detectable levels of TCR alpha or beta transcripts.
- TCR gamma gene expression is suppressed in both B-lineage and myeloid leukemias.