Abstract：
:Pre-exposure to bacterial lipopolysaccharide (LPS) or certain cytokines is known to enhance the ability of murine macrophages to generate a respiratory burst in response to subsequent stimulation, a phenomenon referred to as 'priming'. We report here that the cytokine interleukin-4 (IL-4) can prime murine macrophages. Pretreatment of murine bone marrow-derived macrophages (BMM) with 10 U/ml murine IL-4 for 48 hr was found to enhance the respiratory burst following subsequent stimulation with phorbol myristate acetate (PMA) (10(-6) M) or zymosan (1 mg/ml). Human tumour necrosis factor-alpha (TNF-alpha) (10(-9) M) can also prime BMM for an enhanced respiratory burst and the combination of TNF-alpha and IL-4 resulted in an enhanced (greater than additive) priming effect. In contrast, interferon-gamma (IFN-gamma) (100 U/ml), although by itself capable of priming the BMM respiratory burst, was found to antagonize the priming effects of IL-4. These results demonstrate that IL-4 can be added to the growing list of cytokines capable of modulating the respiratory burst response of macrophages, suggesting a possible role for this cytokine in inflammation and in the host response to infection. The opposing effects of TNF-alpha and IFN-gamma when interacting with IL-4 highlight the difficulties in predicting the effect of a given cytokine in vivo, where potential interactions with other cytokines must be considered.
journal_name
Immunologyjournal_title
Immunologyauthors
Phillips WA,Croatto M,Hamilton JAsubject
Has Abstractpub_date
1990-08-01 00:00:00pages
498-503issue
4eissn
0019-2805issn
1365-2567journal_volume
70pub_type
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