IL-9 and its receptor in allergic and nonallergic lung disease: increased expression in asthma

J Allergy Clin Immunol. 2000 Jan;105(1 Pt 1):108-15. doi: 10.1016/s0091-6749(00)90185-4.


Background: Bronchial asthma is a chronic inflammatory disease associated with genetic components. Recently IL-9 has been reported as a candidate gene for asthma and to be associated with bronchial hyperresponsiveness and elevated levels of total serum IgE.

Objective: To investigate the contribution of IL-9 to the pathogenesis of asthma, we examined the expression of IL-9 and its receptor (IL-9R) in bronchial tissue from subjects with atopic asthma (n = 10), chronic bronchitis (n = 11), and sarcoidosis (n = 9) and from atopic (n = 7) and nonatopic (n = 10) healthy control subjects.

Methods: Bronchial biopsy specimens were examined for the presence of IL-9 and IL-9R protein and messenger RNA (mRNA) by immunocytochemistry and in situ hybridization, respectively. To phenotype the cells expressing IL-9 in asthmatic tissue, combined in situ hybridization and immunocytochemistry was also performed.

Results: There was a highly significant difference (P <.001) in the expression of IL-9 mRNA in asthmatic airways (20.6 +/- 4.0 cells/mm of basement membrane) compared with chronic bronchitis (5.6 +/- 4.4), sarcoidosis (2.5 +/- 1.8), atopic control subjects (7.7 +/- 2.2), and healthy control subjects (2.7 +/- 2.3). The number of IL-9 immunoreactive cells was also greater in asthmatic patients compared with the other groups (P <.05). Although the level of IL-9R mRNA expression did not differ in any of the groups (P >.05), IL-9R immunoreactivity was significantly higher in asthmatic compared with control subjects. Furthermore, IL-9 mRNA expression levels were also significantly correlated with FEV(1) (P <.05) and the airway responsiveness to methacholine producing a 20% fall in FEV(1) (P <. 01). The cells expressing IL-9 mRNA in asthmatic tissue were CD3(+) lymphocytes (68%), major basic protein(+) eosinophils (16%), and elastase(+) neutrophils (8%).

Conclusion: The results of this study demonstrate the potential of IL-9 to be a marker for atopic asthma and furthermore suggest an important role for this cytokine in the pathophysiologic mechanisms of this disease.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Asthma / metabolism*
  • Bronchi / metabolism
  • Bronchial Diseases / metabolism*
  • Bronchitis / metabolism
  • Chronic Disease
  • Female
  • Humans
  • Hypersensitivity / metabolism*
  • Interleukin-9 / genetics
  • Interleukin-9 / metabolism*
  • Male
  • RNA, Messenger / metabolism
  • Receptors, Interleukin / genetics
  • Receptors, Interleukin / metabolism*
  • Receptors, Interleukin-9
  • Reference Values
  • Sarcoidosis / metabolism


  • IL9R protein, human
  • Interleukin-9
  • RNA, Messenger
  • Receptors, Interleukin
  • Receptors, Interleukin-9