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Expression of TAL-1 proteins in human tissues
K Pulford1, N Lecointe, K Leroy-Viard
1University Department of Cellular Science, John Radcliffe Hospital, Oxford, UK.
Blood
|February 1, 1995
Summary
TAL-1 protein is found in the nuclei of erythroid precursors, megakaryocytes, and certain T-cell lines. This discovery aids in diagnosing T-cell acute lymphoblastic leukemia (T-ALL) and lymphomas.
Area of Science:
- Molecular Biology
- Hematology
- Immunocytochemistry
Background:
- The tal-1 gene (SCL/TCL-5) rearrangement is implicated in T-cell acute lymphoblastic leukemia (T-ALL).
- Constitutive tal-1 mRNA expression is observed in erythroid precursors and megakaryocytes.
Purpose of the Study:
- To investigate the distribution and localization of TAL-1 protein in normal human tissues and cell lines.
- To develop immunocytochemical tools for TAL-1 protein detection.
Main Methods:
- Utilized four monoclonal antibodies against recombinant TAL-1 proteins.
- Performed direct immunocytochemical studies on normal human tissues and cell lines.
Main Results:
- TAL-1 protein (39, 41, and 22 kD forms) localized to the nuclei of erythroid precursors, megakaryocytes, T-cell lines (CCRF-CEM, RPMI 8402, Jurkat), smooth muscle, macrophages, and endothelial cells.
- Punctate nuclear labeling suggests TAL-1's role in nuclear structures.
- TAL-1 protein was undetectable in other cell types.
Conclusions:
- TAL-1 protein exhibits a distinct tissue distribution.
- Immunocytochemical reagents for TAL-1 are valuable for diagnosing T-ALL and lymphomas.