Oxidative metabolic status of blood monocytes and alveolar macrophages in the spectrum of human pulmonary tuberculosis

S. Jaswal, Rajiv Dhand, A. K. Sethi, K. K. Kohli, N. K. Ganguly

Research output: Contribution to journalArticle

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Abstract

The oxidative metabolic status of blood monocytes (BM) and alveolar macrophages (AM) in patients with active pulmonary tuberculosis (TB) (n = 40) and in successfully treated patients (n = 40) was assessed and compared with that of healthy control subjects (n = 40). Oxygen free radical (OPR) generation, measured by chemiluminescence (CL) and cytochrome c reduction assay and confirmed by using scavengers of different OFR, was suppressed in AM of the pulmonary TB group compared with healthy controls, whereas it was enhanced in BM. Successfully treated patients showed partial recovery of CL and cytochrome c reduction in AM. There was no significant change in BM of patients after having been treated. The overall capacity to generate OFR was markedly suppressed upon in vitro stimulation with latex in both BM and AM of TB patients. The observed suppressed oxidative metabolic activity in BM and AM was further elucidated by studying the molecular mechanism of respiratory burst. The activities of NADPH oxidase and enzymes of the hexose monophosphate (HMP) shunt were significantly (p < 0.05) decreased in BM and AM of pulmonary TB patients compared with healthy controls. Patients who had been treated showed marked recovery of NADPH oxidase and HMP shunt activity. The present study suggests that tubercle bacilli escape the microbicidal action of macrophages as a result of suppressed OFR generation caused by decreased activity of HMP shunt, leading to decreased levels of NADPH, thereby preventing NADPH oxidase from working at its full capacity.

Original languageEnglish (US)
Pages (from-to)119-128
Number of pages10
JournalScandinavian Journal of Clinical and Laboratory Investigation
Volume52
Issue number2
DOIs
StatePublished - Jan 1 1992

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Alveolar Macrophages
Pulmonary Tuberculosis
Monocytes
Blood
Hexoses
NADPH Oxidase
Pentose Phosphate Pathway
Chemiluminescence
Cytochromes c
Luminescence
Recovery
Macrophages
Latex
Bacilli
Respiratory Burst
NADP
Free Radicals
Assays
Bacillus
Reactive Oxygen Species

All Science Journal Classification (ASJC) codes

  • Clinical Biochemistry

Cite this

Oxidative metabolic status of blood monocytes and alveolar macrophages in the spectrum of human pulmonary tuberculosis. / Jaswal, S.; Dhand, Rajiv; Sethi, A. K.; Kohli, K. K.; Ganguly, N. K.

In: Scandinavian Journal of Clinical and Laboratory Investigation, Vol. 52, No. 2, 01.01.1992, p. 119-128.

Research output: Contribution to journalArticle

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