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SINGLE CELL STUDIES ON 19S ANTIBODY PRODUCTION
The Journal of Experimental Medicine
|March 1, 1964
Summary
Rats produced both 19S and 7S antibodies against Salmonella flagella. Many plasma cells sequentially produced 19S then 7S antibodies, suggesting a developmental pathway for antibody production.
Area of Science:
- Immunology
- Cell Biology
Background:
- Antibody production involves different immunoglobulin classes, primarily 19S (IgM) and 7S (IgG).
- The transition from 19S to 7S antibody production is a key aspect of the adaptive immune response.
Purpose of the Study:
- To investigate the antibody production sequence at the single-cell level in rats.
- To determine if individual plasma cells switch from producing 19S to 7S antibodies.
Main Methods:
- Rats were immunized with Salmonella adelaide flagella.
- Popliteal lymph node cells were isolated and single cells containing surface antibodies were identified.
- Intracellular antibodies were analyzed using mercaptoethanol (ME) sensitivity and specific anti-globulin serum to classify them as 19S, 7S, or double producers.
Main Results:
- Of 123 antibody-containing cells, 42 produced 19S, 64 produced 7S, and 17 were double producers.
- Double producers were most frequent during the 19S to 7S antibody production switch.
- No morphological differences were observed between 19S and 7S producing cells.
Conclusions:
- Many plasma cells or clones sequentially produce 19S and then 7S antibodies with identical binding sites.
- This suggests a developmental progression within plasma cells during the immune response.
- Cellular immaturity did not strictly correlate with 19S production, and mature cells could produce 19S antibodies.