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The bidirectional capacity of bacterial antigens to modulate allergy and asthma

Dept of Clinical Chemisty and Molecular Diagnostics, Philipps University Marburg, Germany

CORRESPONDENCE: H. Renz, Central Laboratory, Hospital of the Philipps University, Baldingerstr., D-35033, Marburg, Germany. Fax: 49 64212865594

Keywords: Allergy, asthma, atopy, bacterial antigens, T-helper 1/T-helper 2 balance

Received: March 20, 2001
Accepted June 19, 2001

Abstract

In recent decades, the prevalence of allergic diseases including bronchial asthma, hay fever and atopic dermatitis, has risen steadily in high-income countries. The underlying mechanisms for this phenomenon remain largely unknown. Since the natural mutation rate is low, altered environmental and lifestyle conditions are thought to play an important role.

Epidemiological and clinical studies have provided indirect evidence that infections may prevent the development of atopy and atopic disease. This is referred to as the "hygiene hypothesis". According to the hygiene hypothesis, viral and/or bacterial infections could inhibit the T-helper (Th)-2 immune response associated with atopic reactions by stimulating a Th-1 response involved in defence of bacterial infections and delayed-type hypersensitivity reactions.

In particular, the prenatal period and early childhood are considered to be critical for the establishment and maintenance of a normal Th-1/Th-2 balance. On the other hand, several studies suggested that infections exacerbate established allergic diseases, e.g. bronchial asthma, airway hyperresponsiveness and atopic dermatitis. Therefore, viral and/or microbial infections and/or their products may have bidirectional effects on the development of allergy and asthma.

This review will focus on recent findings related to the interaction between allergic disorders and infectious diseases, with the main emphasis on bacterial infections.

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