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Characterization of Plasmodium berghei antigens inducing blast transformation in immune rat lymphocytes
Abstract:
Rat erythrocytes, infected with Plasmodium berghei, were disrupted by freezing and thawing or parasites were released by mechanical breaking of the agglutinated erythrocytes. The released soluble antigens, inducing blast transformation in non-adherent immune rat spleen cells, were fractionated by a sequence of salting out, ion exchange chromatography and gel filtration. At the final step a purification factor of 83.7-fold was achieved. This fraction contained three components discernible by SDS-PAGE of molecular weights 56, 66 and 72 kD respectively. The free parasites, also induced blast transformation in immune rat spleen cells. After disruption by freeze-thawing the majority of the active antigens was found in the sediment after centrifugation at 17,300 g.
Insights
Researchers isolated Plasmodium berghei soluble antigens that induce immune cell blast transformation. These purified antigens, crucial for understanding malaria immunity, were characterized by their molecular weights.
Area of Science:
- Immunology
- Parasitology
- Biochemistry
Background:
- Rat erythrocytes infected with Plasmodium berghei are a model for malaria research.
- Understanding parasite antigens is key to developing malaria immunity strategies.
Purpose of the Study:
- To isolate and characterize soluble antigens from Plasmodium berghei.
- To investigate the immunogenic properties of these antigens in stimulating rat spleen cells.
Main Methods:
- Parasite disruption via freezing/thawing or mechanical methods.
- Antigen fractionation using salting out, ion exchange chromatography, and gel filtration.
- Analysis of purified components using SDS-PAGE.
Main Results:
- Soluble antigens were successfully isolated and purified 83.7-fold.
- The purified fraction contained three components with molecular weights of 56, 66, and 72 kD.
- These antigens induced blast transformation in immune rat spleen cells.
Conclusions:
- Plasmodium berghei soluble antigens can be purified and possess immunogenic activity.
- The identified protein components are likely involved in the host immune response to malaria.