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Immunosuppression Reduces Lung Injury Caused by Mycoplasma pneumoniae Infection

Shuang Shi1,2, Xiuqing Zhang1, Yao Zhou1

  • 1Department of Respiratory Medicine, Children's Hospital of Nanjing Medical University, Nanjing, 210000, China.

Scientific Reports
|May 11, 2019
PubMed

Insights

Immunological responses significantly contribute to Mycoplasma pneumoniae pneumonia (MPP) severity. Immunosuppression can reduce lung injury in MPP, suggesting a role for immune modulation in managing this infection.

Area of Science:

  • Pulmonary Medicine
  • Immunology
  • Microbiology

Background:

  • The pathogenesis of Mycoplasma pneumoniae pneumonia (MPP) remains incompletely understood.
  • Investigating the interplay between immune response and lung injury is crucial for understanding MPP.

Purpose of the Study:

  • To explore the correlation between immune response and lung injury in MPP.
  • To compare clinical characteristics and disease severity in patients with and without immunosuppressive chemotherapy.
  • To elucidate the role of immune response in MPP pathogenesis using animal models.

Main Methods:

  • Comparative analysis of clinical data from MPP patients with and without immunosuppressive chemotherapy.
  • Establishment of mouse models for MPP and immunosuppression (using cyclophosphamide).
  • Evaluation of myeloperoxidase (MPO) and oxidant-antioxidant enzyme activities (superoxide dismutase [SOD], malondialdehyde [MDA]) in lung tissues.

Main Results:

  • Patients receiving immunosuppressants showed a lower incidence and severity of MPP.
  • Severe MPP cases were associated with a higher incidence of immune disorders.
  • Immunosuppressed mice exhibited less severe lung injury and inflammation compared to wild-type mice post-MP infection, with altered MPO, MDA, and SOD levels.

Conclusions:

  • Immunological responses are pivotal in the pathogenesis of MPP.
  • Oxidant-antioxidant imbalance may contribute to lung injury following MP infection.
  • Immunosuppression demonstrates potential in mitigating lung injury associated with MPP.

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