Relationship between changes in interferon-γ production by peripheral blood T cells and changes in peak expiratory flow rate in patients with chronic stable asthma
Article first published online: 11 DEC 2002
Clinical & Experimental Allergy
Volume 32, Issue 12, pages 1734–1738, December 2002
How to Cite
Koh, Y. I., Choi, I. S. and Lee, H.-C. (2002), Relationship between changes in interferon-γ production by peripheral blood T cells and changes in peak expiratory flow rate in patients with chronic stable asthma. Clinical & Experimental Allergy, 32: 1734–1738. doi: 10.1046/j.1365-2222.2002.01561.x
- Issue published online: 11 DEC 2002
- Article first published online: 11 DEC 2002
- Submitted 20 August 2001; revised 26 October 2001; accepted 10 September 2002
- peak expiratory flow rates;
Background Cytokines production by T helper lymphocytes (Th cells), which orchestrate the interplay of the different cells involved in airway inflammation of asthma, may be reflected in peripheral blood. Some studies have suggested that the Th cell cytokines by peripheral blood T cells correlate with asthma severity.
Objective To investigate the relationship between changes in IFN-γ production by peripheral blood T cells and changes in lung function in chronic stable asthmatics.
Methods Sixteen patients with chronic stable moderate asthma aged 35–65 years (nine women) were recruited. Morning and evening peak expiratory flow rates (PEFR) monitoring and blood sampling for peripheral blood T cell culture, total IgE and blood eosinophils were performed at baseline and week 12. Levels of IFN-γ, IL-4 and IL-5 in culture supernatants of peripheral blood T cell were determined by using enzyme-linked immunosorbent assay (ELISA) kits.
Results Patients with increased IFN-γ changes from baseline showed significantly increased changes in morning (P = 0.02) and evening (P < 0.05) PEFR compared with those with decreased IFN-γ changes. The changes in IFN-γ production and IFN-γ: IL-4 ratio significantly correlated with the changes in morning PEFR (Rs = 0.59, P < 0.02; Rs = 0.63, P < 0.01, respectively) and tended to correlate with the changes in evening PEFR (Rs = 0.45, P = 0.08; Rs = 0.5, P = 0.05, respectively). The changes in IL-4 and IL-5 did not correlate with the changes in IgE and blood eosinophils, respectively.
Conclusions These findings suggest that IFN-γ may be associated with the alteration of lung function in asthmatics and play a role in the pathophysiology of chronic stable asthma.