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Electron microscope studies of Anaplasma marginale in an Aedes albopictus culture system
Abstract:
Anaplasma marginale was seen by electron microscopy within the cytoplasm of Aedes albopictus cells in culture. Anaplasma marginale was seen in free bovine RBC as well as in RBC phagocytized by Ae albopictus cells. Some A marginale organisms, both intracellular and extracellular, remained intact for as long as 60 days in culture, and Anaplasma inclusion appendages were seen in free-lysed RBC and in lysed RBC phagocytized by Ae albopictus cells. Although some A marginale organisms had deteriorated by day 60, the structure of most A marginale organisms did not change appreciably from that in its natural bovine host. Reproduction of A marginale was not seen.
Insights
Electron microscopy revealed Anaplasma marginale within Aedes albopictus cells and bovine red blood cells. The bacteria remained intact for up to 60 days in culture, but reproduction was not observed.
Area of Science:
- Veterinary Microbiology
- Cell Biology
- Entomology
Background:
- Anaplasma marginale is a significant tick-borne pathogen affecting cattle.
- Understanding the survival and interaction of Anaplasma marginale within insect cell lines is crucial for vector competence studies.
Purpose of the Study:
- To investigate the intracellular presence and survival of Anaplasma marginale in Aedes albopictus cell cultures.
- To observe the morphological integrity of Anaplasma marginale in an in vitro insect cell environment.
Main Methods:
- Culturing of Aedes albopictus (mosquito) cells.
- Inoculation of cell cultures with Anaplasma marginale.
- Electron microscopy for visualizing intracellular and extracellular bacteria.
Main Results:
- Anaplasma marginale was visualized within the cytoplasm of Aedes albopictus cells.
- The pathogen was observed in both free and phagocytized bovine red blood cells.
- Intact Anaplasma marginale organisms were maintained in culture for up to 60 days.
- Anaplasma inclusion appendages were noted in lysed red blood cells, both intracellular and extracellular.
- No reproduction of Anaplasma marginale was detected in the cultured cells.
Conclusions:
- Aedes albopictus cell cultures can support the survival of Anaplasma marginale for extended periods.
- The in vitro environment in Aedes albopictus cells largely preserves the structure of Anaplasma marginale.
- Further research is needed to elucidate the potential for Anaplasma marginale replication in insect cells.