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Expression of a 215,000-dalton nuclear envelope protein decreases during cell maturation
Abstract:
The monoclonal antibody AGF2.3 identifies a nuclear envelope protein expressed at high levels in most transformed cell lines and weakly expressed in or absent from normal tissues and primary cell cultures. Here we report that expression of AGF2.3 antigen relates to the maturation status of cells. When HL60 cells were induced to mature loss of AGF2.3 antigen correlated with the appearance of neutrophils in culture. Acute myeloid leukaemia cells were intensely labelled by AGF2.3 antibody whereas chronic myeloid leukaemia cells were weakly reactive. Staining of tonsil epithelium showed a progressive loss of antigen during epithelial cell maturation. High levels of AGF2.3 antigen in most permanent cell lines suggest that such lines represent transformation of immature cells.
Insights
The AGF2.3 antibody identifies a nuclear envelope protein. Its expression level correlates with cell maturation, decreasing as cells mature and increasing in transformed or immature cells.
Area of Science:
- Cell Biology
- Immunology
- Cancer Research
Background:
- A nuclear envelope protein identified by monoclonal antibody AGF2.3 is highly expressed in transformed cell lines but absent in normal tissues.
- The expression pattern of this antigen suggests a potential role in cell differentiation or transformation.
Purpose of the Study:
- To investigate the relationship between the expression of the AGF2.3 antigen and the maturation status of cells.
- To determine if AGF2.3 expression can serve as a marker for cell transformation and differentiation.
Main Methods:
- Utilized monoclonal antibody AGF2.3 for immunolabeling.
- Studied HL60 cells induced to mature.
- Analyzed acute myeloid leukemia (AML) and chronic myeloid leukemia (CML) cells.
- Examined tonsil epithelium for antigen expression during maturation.
Main Results:
- Loss of AGF2.3 antigen expression correlated with neutrophil appearance during HL60 cell maturation.
- Acute myeloid leukemia cells showed intense AGF2.3 labeling, while chronic myeloid leukemia cells were weakly reactive.
- Epithelial cell maturation in tonsil tissue was associated with a progressive decrease in AGF2.3 antigen levels.
- High AGF2.3 antigen levels in permanent cell lines suggest they represent immature, transformed cells.
Conclusions:
- AGF2.3 antigen expression is inversely correlated with cellular maturation.
- The AGF2.3 antibody can potentially distinguish between immature/transformed cells and mature cells.
- This antigen may serve as a biomarker for cell differentiation status and transformation.