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Metabolic differences between normal and neoplastic cells: effects of aminonucleoside on cytoplasmic messenger RNA
Abstract:
Treatment of cultured normal human fibroblasts with an adenosine analog (aminonucleoside of puromycin) rapidly inhibits the appearance of cytoplasmic messenger RNA, identified by its polyadenylate sequence. Similar treatment of SV40-transformed fibroblasts does not lead to such an inhibition. Cordycepin. another analog of adenosine. inlhibits polyadenylate-containing cytoplasmic RNA in both types of cell.
Insights
Normal human fibroblasts treated with an adenosine analog showed inhibited messenger RNA appearance, unlike SV40-transformed cells. Cordycepin, another adenosine analog, inhibited RNA in both cell types, suggesting differential effects of adenosine analogs on gene expression.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Cytoplasmic messenger RNA (mRNA) plays a crucial role in protein synthesis.
- Polyadenylation is a key modification of eukaryotic mRNA.
- Adenosine analogs are used to study nucleic acid metabolism and function.
Purpose of the Study:
- To investigate the effect of an adenosine analog (aminonucleoside of puromycin) on polyadenylate-containing cytoplasmic mRNA in normal and SV40-transformed human fibroblasts.
- To compare the effects of aminonucleoside of puromycin with another adenosine analog, cordycepin.
Main Methods:
- Treatment of cultured human fibroblasts (normal and SV40-transformed) with adenosine analogs.
- Analysis of cytoplasmic messenger RNA, specifically identifying polyadenylate sequences.
Main Results:
- Aminonucleoside of puromycin treatment rapidly inhibited the appearance of polyadenylate-containing cytoplasmic mRNA in normal human fibroblasts.
- SV40-transformed fibroblasts did not exhibit this inhibition upon treatment with aminonucleoside of puromycin.
- Cordycepin inhibited polyadenylate-containing cytoplasmic RNA in both normal and SV40-transformed fibroblasts.
Conclusions:
- The adenosine analog aminonucleoside of puromycin differentially affects mRNA metabolism in normal versus SV40-transformed human fibroblasts.
- Cordycepin demonstrates a broader inhibitory effect on polyadenylate-containing RNA across both cell types.
- These findings highlight distinct cellular responses to adenosine analogs and their impact on gene expression regulation.