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Related Experiment Videos

Granuloma and cryptococcosis.

Kazutoshi Shibuya1, Akiko Hirata, Junko Omuta

  • 1Department of Pathology, Omori Hospital, Toho University School of Medicine, 6-11-1 Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan. kaz@med.toho-u.ac.jp

Journal of Infection and Chemotherapy : Official Journal of the Japan Society of Chemotherapy
|July 2, 2005
PubMed
Summary

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Histopathology of cryptococcosis differs between immunocompetent individuals and those with acquired immunodeficiency syndrome (AIDS). Treatment with highly active antiretroviral therapy (HAART) significantly alters lesion morphology in AIDS patients.

Area of Science:

  • Medical Pathology
  • Infectious Diseases
  • Immunology

Background:

  • Cryptococcosis presents distinct histopathological features in immunocompetent hosts versus individuals with acquired immunodeficiency syndrome (AIDS).
  • T-cell dysfunction in AIDS patients significantly impacts the host's response to Cryptococcus, characterized by yeast proliferation and a predominantly histiocytic infiltrate.
  • Pulmonary lesions in cryptococcosis exhibit varied inflammatory patterns, ranging from mild to massive infections.

Purpose of the Study:

  • To review the general histopathological features of cryptococcosis in different immune states.
  • To detail histological changes in cryptococcal lesions, considering modifications induced by highly active antiretroviral therapy (HAART).
  • To elucidate the impact of immune status and HAART on the host's inflammatory response to Cryptococcus.

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Main Methods:

  • Histological examination of cryptococcal lesions.
  • Immunohistological analysis to assess cellular components (T cells, histiocytes, CD4+ cells) and antigen-presenting activity.
  • Comparison of lesion patterns in immunocompetent individuals, untreated AIDS patients, and HAART-treated AIDS patients.

Main Results:

  • In T-cell deficient individuals (AIDS patients), cryptococcosis shows yeast proliferation with histiocytic response and minimal lymphocytic/neutrophilic infiltration.
  • Pulmonary lesions can range from mild foci to massive infections, with alveolar septal capillary involvement being common in untreated AIDS patients.
  • HAART in AIDS patients is associated with increased CD4+ cells, enhanced histiocytic response, multinucleated giant cell formation, and reduced capillary involvement.

Conclusions:

  • The histopathological presentation of cryptococcosis is heavily influenced by the host's immune status, particularly T-cell function.
  • Untreated AIDS patients exhibit limited resistance to cryptococcal dissemination due to immune deficiency.
  • HAART significantly modulates the host-pathogen interaction in pulmonary cryptococcosis, leading to distinct histological features and improved inflammatory responses.