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Updated: Jun 20, 2026

Processing of Bronchoalveolar Lavage Fluid and Matched Blood for Alveolar Macrophage and CD4+ T-cell Immunophenotyping and HIV Reservoir Assessment
07:21

Processing of Bronchoalveolar Lavage Fluid and Matched Blood for Alveolar Macrophage and CD4+ T-cell Immunophenotyping and HIV Reservoir Assessment

Published on: June 23, 2019

Airway obstruction is increased in pneumocystis-colonized human immunodeficiency virus-infected outpatients

Alison Morris1, Travis Alexander, Saba Radhi

  • 1University of Pittsburgh Medical Center, 628 NW MUH, 3459 Fifth Avenue, Pittsburgh, PA 15213, USA. morrisa@upmc.edu

Journal of Clinical Microbiology
|September 18, 2009
PubMed

Insights

Pneumocystis colonization is linked to worse airway obstruction and higher matrix metalloprotease-12 levels in people with HIV. This suggests Pneumocystis may play a role in HIV-associated chronic obstructive pulmonary disease.

Area of Science:

  • Pulmonary Medicine
  • Infectious Diseases
  • Immunology

Background:

  • Human immunodeficiency virus (HIV) infection is associated with an increased risk of chronic obstructive pulmonary disease (COPD).
  • The role of opportunistic infections, such as Pneumocystis, in the pathogenesis of HIV-associated COPD is not fully understood.
  • Matrix metalloproteinases (MMPs) are implicated in tissue remodeling and inflammation in lung diseases.

Purpose of the Study:

  • To investigate the association between Pneumocystis colonization, sputum matrix metalloprotease levels, and airway obstruction in HIV-infected outpatients.
  • To explore the potential contribution of Pneumocystis to the development of COPD in the context of HIV infection.

Main Methods:

  • A cohort of HIV-infected outpatients was studied.
  • Pneumocystis colonization was assessed.
  • Sputum samples were analyzed for matrix metalloprotease-12 (MMP-12) levels.
  • Airway obstruction was evaluated.

Main Results:

  • Subjects with Pneumocystis colonization exhibited significantly worse airway obstruction compared to non-colonized subjects.
  • Higher levels of MMP-12 were detected in the sputum of Pneumocystis-colonized individuals.
  • These findings suggest a correlation between Pneumocystis colonization, inflammation, and airway remodeling.

Conclusions:

  • Pneumocystis colonization may be an important factor contributing to the severity of airway obstruction in HIV-infected individuals.
  • The presence of Pneumocystis and elevated MMP-12 levels may indicate a role for this organism in the pathogenesis of HIV-associated COPD.
  • Further research is warranted to elucidate the mechanisms underlying this association and its clinical implications.

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