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Published on: May 19, 2014
Ultrastructural analysis of membrane-bound polysomes in mouse "nonsecretory" myeloma (nonproducing type)
Abstract:
Using our electron microscopic method of polysome analysis we ascertained the numbers of membrane-bound polysomes and their constituent ribosomes in myeloma cells of J 606 (IgG3) and MOPC315 (IgA) parent cell lines and in their variants that did not produce and, accordingly, secrete either H- or L-chains. Both variants had far fewer membrane-bound polysomes than the respective parent lines. The polysome distribution curve drawn for each of these variants showed one peak at 5-6 ribosomes. In contrast to this finding, the distribution curves for the J 606 and MOPC315 parent lines gave two peaks. These observations on mouse myelomas strongly resembled those on human myelomas.
Insights
Researchers studied myeloma cells using electron microscopy. Variants lacking antibody chains showed fewer membrane-bound polysomes, suggesting a link between polysome number and antibody production.
Area of Science:
- Cell Biology
- Molecular Biology
- Immunology
Background:
- Myeloma cells are known for producing and secreting immunoglobulins (antibodies).
- The structure and function of polysomes are critical for protein synthesis.
Purpose of the Study:
- To investigate the relationship between antibody (H- and L-chain) production and membrane-bound polysome characteristics in myeloma cells.
- To compare polysome profiles in parent myeloma cell lines with those of their non-producing variants.
Main Methods:
- Utilized an electron microscopic method for polysome analysis.
- Quantified membrane-bound polysomes and their ribosomes in J 606 (IgG3) and MOPC315 (IgA) myeloma cell lines and their variants.
- Analyzed polysome distribution curves.
Main Results:
- Myeloma variants lacking H- or L-chain production exhibited significantly fewer membrane-bound polysomes compared to parent lines.
- Polysome distribution curves for variants showed a single peak at 5-6 ribosomes.
- Parent cell lines displayed two peaks in their polysome distribution curves.
Conclusions:
- The number of membrane-bound polysomes is directly correlated with the capacity for antibody H- and L-chain synthesis and secretion.
- Findings in mouse myeloma models closely mirror observations in human myeloma cells.
- Polysome analysis provides insights into the molecular mechanisms of immunoglobulin production.
