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Effect of polymorphonuclear depletion on experimental Argentine hemorrhagic fever in guinea pigs
Abstract:
The role that polymorphonuclear leukocytes (PMN) may play in Argentine hemorrhagic fever (AHF), an endemo-epidemic disease caused by Junín virus (JV), was investigated in experimentally infected guinea pigs depleted of PMN by means of specific antiserum. In leucopenic animals the evolution of the infection with a highly pathogenic strain of JV was more severe, with earlier mortality and higher virus yields in blood and viscera. The pathological study showed similar lesions in both the control and PMN-depleted animals with the exception of the lung, which showed the pathological picture of the human "pulmonary distress syndrome of the adult" in nontreated guinea pigs and appeared histologically unaltered in the PMN-depleted animals. On the basis of these results it is suggested that in AHF, PMN play a dual role. In the first stage of infection they display a defensive antiviral action, but later on they participate in the pathogenesis of tissue damage.
Insights
Polymorphonuclear leukocytes (PMN) play a dual role in Argentine hemorrhagic fever (AHF). Initially, PMNs defend against Junin virus (JV), but later contribute to tissue damage, worsening the disease.
Area of Science:
- Virology
- Immunology
- Pathology
Background:
- Argentine hemorrhagic fever (AHF) is an endemic disease caused by Junin virus (JV).
- The role of polymorphonuclear leukocytes (PMN) in AHF pathogenesis is not fully understood.
Purpose of the Study:
- To investigate the role of PMN in the pathogenesis of Junin virus infection.
- To determine if PMN depletion affects the severity and outcome of experimental AHF.
Main Methods:
- Guinea pigs were experimentally infected with a pathogenic strain of Junin virus.
- PMN depletion was achieved using specific antiserum.
- Clinical signs, mortality, virus yields, and pathological lesions were assessed.
Main Results:
- PMN-depleted guinea pigs exhibited more severe infections, earlier mortality, and higher virus yields.
- Lung pathology consistent with adult respiratory distress syndrome was observed in control animals but not in PMN-depleted animals.
- Similarities in other pathological lesions were noted between control and PMN-depleted groups.
Conclusions:
- PMN play a dual role in AHF pathogenesis.
- PMN exhibit an early antiviral defense mechanism.
- Later, PMN contribute to tissue damage and disease severity.