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T lymphocytes in pulmonary tuberculosis

M D Ashtekar1, A M Samuel, G V Kadival

  • 1Radiation Medicine Centre, Bhabha Atomic Research Centre, Bombay.

The Indian Journal of Medical Research
|January 1, 1993
PubMed
Summary
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Tuberculosis alters T cell counts, with reactive forms causing CD4 lymphopenia. Intermediate and unreactive tuberculosis show B and CD8 lymphocytosis, impacting CD4/CD8 ratios.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Clinical Research

Background:

  • Tuberculosis (TB) diagnosis and staging are critical for effective treatment.
  • Understanding immune responses, particularly T cell dynamics, is key to characterizing TB.
  • Lenzini's classification categorizes TB into reactive, intermediate, and unreactive forms.

Purpose of the Study:

  • To investigate T cell subset alterations in different forms of tuberculosis.
  • To correlate specific lymphocyte changes with TB reactivity as defined by Lenzini.

Main Methods:

  • Evaluation of T cells and their sub-populations.
  • Classification of tuberculosis into reactive, intermediate, and unreactive forms.
  • Analysis of CD4, CD8, and B lymphocyte counts and CD4/CD8 ratios.

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Main Results:

  • Reactive tuberculosis showed significant CD4 lymphopenia and reduced CD4/CD8 ratios.
  • Intermediate and unreactive tuberculosis exhibited B lymphocytosis and CD8 lymphocytosis.
  • CD4/CD8 ratios were reduced in intermediate and unreactive TB, while T lymphocytes and CD4 subsets remained unchanged.
  • No significant differences in lymphocyte counts were observed between intermediate and unreactive TB groups.

Conclusions:

  • Distinct T cell subset profiles characterize different forms of tuberculosis.
  • CD4 lymphopenia is a marker for reactive tuberculosis.
  • B and CD8 lymphocytosis are associated with intermediate and unreactive tuberculosis.
  • Immune profiling can aid in understanding TB pathogenesis and classification.