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Isolation and characterization of murine erythroleukemia cell variants nonresponsive to hemin for the expression of
Abstract:
Thirty-four cloned lines of mouse erythroleukemia (MEL) cells that showed impairment in hemoglobin sy nthesis induced by hemin were isolated from line 745. Among these lines, 75% showed a reduced or nil response to induction by dimethyl sulfoxide (DMSO) and/or hypoxanthine. Four of these clones (three lines nonresponsive to hemin and one not responsive to either hemin or DMSO) were further characterized for the amount of globin mRNA accumulated in the cytoplasm and for the rate of globin synthesis upon exposure to hemin or DMSO. None of the four were induced by hemin to accumulate globin mRNA and all had a reduced rate of globin synthesis by comparison with control line 745. Two of the four lines had a high uninduced level of cytoplasmic globin mRNA not matched by a corresponding rate of globin synthesis, suggesting that they may accumulate defective globin mRNAs.
Insights
Researchers identified mouse erythroleukemia (MEL) cell lines with impaired hemoglobin synthesis. Some lines showed defective globin mRNA accumulation, impacting protein production.
Area of Science:
- Cell Biology
- Molecular Biology
- Hematology
Background:
- Mouse erythroleukemia (MEL) cells are a model system for studying erythroid differentiation and hemoglobin synthesis.
- Induction of hemoglobin synthesis in MEL cells can be achieved using chemical agents like hemin and dimethyl sulfoxide (DMSO).
- Mutant cell lines with defects in hemoglobin production are valuable for understanding the underlying molecular mechanisms.
Purpose of the Study:
- To isolate and characterize cloned lines of MEL cells exhibiting impaired hemoglobin synthesis.
- To investigate the molecular basis of defective hemoglobin production in these mutant MEL cell lines.
- To identify potential defects in globin mRNA accumulation and translation.
Main Methods:
- Isolation of cloned MEL cell lines from a parental line (745) exhibiting impaired hemin-induced hemoglobin synthesis.
- Assessment of cellular response to induction by hemin, dimethyl sulfoxide (DMSO), and hypoxanthine.
- Quantification of cytoplasmic globin mRNA levels.
- Measurement of the rate of globin synthesis.
- Comparative analysis between mutant and control cell lines.
Main Results:
- Thirty-four cloned MEL cell lines with impaired hemin-induced hemoglobin synthesis were isolated.
- Approximately 75% of these lines showed reduced or no response to DMSO and/or hypoxanthine induction.
- Four selected clones were further analyzed; none accumulated globin mRNA upon hemin induction and all showed reduced globin synthesis compared to controls.
- Two lines exhibited high uninduced globin mRNA levels without corresponding protein synthesis, suggesting defective globin mRNA.
Conclusions:
- Mutant MEL cell lines with defects in hemoglobin synthesis can be generated and isolated.
- Impaired hemoglobin synthesis can result from defects in globin mRNA accumulation or translation.
- Some MEL cell lines may accumulate defective globin mRNAs, leading to reduced protein synthesis.
- These characterized cell lines provide valuable tools for studying the regulation of erythroid differentiation and hemoglobin production.