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High-yield preparation of purified Anaplasma marginale from infected bovine red blood cells
Abstract:
Purification of Anaplasma marginale from infected bovine RBC was achieved through enzyme treatment and density-gradient centrifugation. A relative yield of 41.6% was obtained by dividing the number of organisms in the final purified preparation by the number of A marginale-infected RBC. Purified parasites were verified as A marginale by light microscopy, electron microscopy, and immunologic tests. The purified parasites reacted positively with calf and rabbit anti-A marginale sera in interfacial and slide agglutination tests. Anti-bovine RBC serum did not agglutinate purified A marginale, indicating absence of any contaminating RBC stroma. Anaplasma marginale was antigenic, but did not cause infection when the preparation was inoculated into a susceptible calf. The density of A marginale was determined to be 1.19 g/ml and cell diameters ranged from 0.25 to 0.63 micron. This method provided procedures for obtaining A marginale free of bovine RBC antigens for accurate biochemical assays and vaccine production.
Insights
Researchers purified Anaplasma marginale from infected bovine red blood cells (RBCs) using enzyme treatment and density-gradient centrifugation. This method yields pure Anaplasma marginale for accurate assays and vaccine development.
Area of Science:
- Veterinary Parasitology
- Microbiology
- Biochemistry
Background:
- Anaplasma marginale is an obligate intracellular bacterium causing significant economic losses in cattle.
- Accurate biochemical analysis and vaccine development require highly purified Anaplasma marginale free from host cell contaminants.
Purpose of the Study:
- To develop and validate a method for purifying Anaplasma marginale from infected bovine red blood cells.
- To ensure the purity and antigenic properties of the isolated Anaplasma marginale.
Main Methods:
- Infected bovine red blood cells (RBCs) were treated with enzymes.
- Purification was achieved using density-gradient centrifugation.
- Purity was confirmed via light microscopy, electron microscopy, and immunologic tests (agglutination assays).
Main Results:
- A relative yield of 41.6% Anaplasma marginale was obtained.
- Purified parasites were confirmed as Anaplasma marginale and were free of bovine RBC antigens.
- The purified Anaplasma marginale was antigenic but non-infectious when inoculated into a susceptible calf.
- Determined Anaplasma marginale density (1.19 g/ml) and cell diameter (0.25–0.63 micron).
Conclusions:
- The described method effectively purifies Anaplasma marginale from bovine RBCs.
- This purification technique is suitable for obtaining Anaplasma marginale for biochemical assays and vaccine production.
- The purified Anaplasma marginale retains antigenicity without causing infection, highlighting its potential for vaccine development.