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Neutrophils synthesize and activate TGFbeta2
C H Szymkowiak1, E Csernok, D Reinhold
1Department of Clinical Rheumatology, Medical University of Lübeck, Germany.
Abstract:
Human polymorphonuclear neutrophils (PMN) are regulated by soluble factors such as chemotactic peptides and cytokines. PMN themselves are capable of synthesizing and releasing various cytokines, thereby taking part in the afferent or inductive limb of the immune response. We report for the first time that TGFbeta2 can be synthesized and released by PMN obtained from peripheral blood. Reverse transcriptase polymerase chain reaction (RT-PCR) showed that preparations of PMN express mRNA for transforming growth factor (TGF)beta1 and TGFbeta2 but not for TGFbeta3. Only translation of TGFbeta2 into protein was observed applying different assays. Interestingly, TGFbeta2 in supernatants from stimulated PMN could be detected in the bioactive form.
Insights
Human neutrophils synthesize and release transforming growth factor-beta2 (TGF-beta2). This study demonstrates that peripheral blood polymorphonuclear neutrophils (PMN) express TGF-beta2 mRNA and secrete bioactive TGF-beta2 protein.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Human polymorphonuclear neutrophils (PMN) are key immune cells regulated by soluble factors.
- PMN are known to synthesize and release cytokines, contributing to immune responses.
- The role of PMN in cytokine production, particularly TGF-beta, requires further elucidation.
Purpose of the Study:
- To investigate the capacity of human peripheral blood PMN to synthesize and release transforming growth factor-beta (TGF-beta) isoforms.
- To determine if PMN express mRNA for TGF-beta1, TGF-beta2, and TGF-beta3.
- To confirm the translation of TGF-beta mRNA into bioactive protein by PMN.
Main Methods:
- Isolation of PMN from peripheral blood.
- Reverse transcriptase polymerase chain reaction (RT-PCR) to detect TGF-beta mRNA expression.
- Immunoassays to detect TGF-beta protein production.
- Assessment of TGF-beta bioactivity in PMN supernatants.
Main Results:
- PMN express mRNA for transforming growth factor-beta1 (TGF-beta1) and TGF-beta2, but not TGF-beta3.
- TGF-beta2 protein was detected in PMN preparations, indicating translation from mRNA.
- Stimulated PMN released bioactive TGF-beta2 into the supernatant.
Conclusions:
- Human peripheral blood PMN can synthesize and release TGF-beta2.
- TGF-beta2 produced by PMN exists in a bioactive form.
- These findings highlight a novel role for PMN in regulating immune responses through TGF-beta2 production.