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Leukopenia with granulocytopenia in experimental mucormycosis (Rhizopus oryzae infection)
Abstract:
Mucormycosis was produced in rabbits with sustained, severe leukopenia and granulocytopenia induced by repeated injections of nitrogen mustard. Initially, these animals developed extensive fungus lesions at the site of inoculation which later became granulomatous and tended to heal. Only the early phases of host resistance appeared impaired by the virtual elimination of the polymorphonuclear leukocyte as a factor in the host response. Despite the persistent leukopenia and granulocytopenia, the later phases of host resistance resembled those of the normal animal. Thus, the behavior of the infection in this experiment differs greatly from the unchecked progression of mucormycosis in the metabolically abnormal animal with acute alloxan diabetes. The differences in the course of the disease and in the morphologic appearance of the lesions indicate that metabolic alterations in the host affect all phases of host resistance and not only the polymorphonuclear leukocytic response.
Insights
Nitrogen mustard induced leukopenia in rabbits showed that while early host resistance to mucormycosis was impaired, later stages were similar to normal animals, unlike in diabetes.
Area of Science:
- Mycology
- Immunology
- Pathology
Background:
- Mucormycosis is a severe fungal infection.
- Host immune response plays a critical role in controlling mucormycosis.
- Understanding immune deficits that exacerbate mucormycosis is crucial.
Purpose of the Study:
- To investigate the role of leukopenia and granulocytopenia in the host response to mucormycosis.
- To compare the course of mucormycosis in rabbits with induced leukopenia versus metabolically abnormal animals.
Main Methods:
- Rabbits were induced with sustained, severe leukopenia and granulocytopenia using nitrogen mustard injections.
- Fungal lesions at the inoculation site were monitored for development and healing.
- The course of infection and host resistance phases were observed.
Main Results:
- Initially, rabbits developed extensive fungal lesions that later became granulomatous and healed.
- Early host resistance was impaired due to the lack of polymorphonuclear leukocytes.
- Later phases of host resistance were preserved despite persistent leukopenia, resembling normal animals.
Conclusions:
- Polymorphonuclear leukocytes are critical for early host resistance against mucormycosis.
- Metabolic alterations in the host, unlike transient leukopenia, affect all phases of host resistance to mucormycosis.
- The course of mucormycosis is significantly influenced by the host's metabolic state.
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