Related Experiment Videos
Resistance to malaria in ankyrin and spectrin deficient mice
1Department of Medical and Molecular Parasitology, New York University School of Medicine, N.Y.
Abstract:
Inbred mice carrying mutations in ankyrin and/or spectrin synthesis and assembly were studied for their ability to support the growth of the rodent malarias, Plasmodium chabaudi adami and P. berghei, in vivo. Mice carrying the nb/nb (normoblastosis) mutation which do not synthesize ankyrin and therefore also have a deficiency in membrane-bound spectrin, were refractory to P. chabaudi adami, which invades mature erythrocytes and to P. berghei, which invades reticulocytes. Similarly, sph/sph mice which do not synthesize the alpha chain of spectrin but do synthesize ankyrin, were also resistant to both parasites. The heterozygote for the nb defect (nb/+) exhibited a diminution of parasitaemia. We conclude that the host cell spectrin may be necessary for the invasion and/or growth of rodent malarial parasites.
Insights
Mice with mutations affecting spectrin or ankyrin synthesis were resistant to malaria. This suggests spectrin is crucial for malaria parasite invasion and growth in host cells.
Area of Science:
- Cell biology
- Parasitology
- Genetics
Background:
- Ankyrin and spectrin are key proteins in erythrocyte membrane structure.
- Malaria parasites, Plasmodium species, infect red blood cells.
- Understanding host-parasite interactions is vital for malaria control.
Purpose of the Study:
- To investigate the role of ankyrin and spectrin in supporting rodent malaria parasite growth.
- To determine if spectrin deficiency affects susceptibility to Plasmodium chabaudi adami and Plasmodium berghei infections.
Main Methods:
- Studied inbred mice with mutations in ankyrin (nb/nb) and spectrin (sph/sph).
- Inoculated mice with Plasmodium chabaudi adami and Plasmodium berghei.
- Monitored parasitemia to assess parasite growth and host resistance.
Main Results:
- nb/nb mice, lacking ankyrin and spectrin, were refractory to both malaria parasites.
- sph/sph mice, lacking alpha-spectrin, were also resistant to both parasites.
- Heterozygous nb/+ mice showed reduced parasitemia, indicating a dose-dependent effect.
Conclusions:
- Host cell spectrin appears essential for the invasion and/or growth of rodent malaria parasites.
- Ankyrin and spectrin play a critical role in erythrocyte susceptibility to Plasmodium infection.
- These findings highlight potential new targets for antimalarial strategies.