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Influence of Fetuin-A on Chlamydia muridarum Pulmonary Infection
Faria Mahjabeen1, Jieh-Juen Yu1, James P Chambers1
1Department of Molecular Microbiology and Immunology, The University of Texas at San Antonio, San Antonio, Texas 78249, USA.
Abstract:
Fetuin-A is an acute phase glycoprotein shown to counter in a regulatory manner proinflammatory cytokine production to maintain homeostasis during inflammation. We report here that in wild-type mice 12 days after Chlamydia muridarum (Cm) intranasal challenge, fetuin-A content in the lungs decreased 46%, while INF-γ increased 44%, consistent with a negative regulatory role of fetuin-A in inflammation. Importantly, the observed increased IFN-γ production was abrogated in fetuin-A-deficient AHSG mice suggesting that IFN-γ induction following Cm infection is fetuin-A dependent. Assessment of expression of genes associated with inflammation revealed fetuin-A-dependent upregulation of TBX21 (a Th1 cell-specific transcription factor) in the lungs of Cm-infected WT mice that correlated with IFN-γ induction. Additionally, the effect of fetuin-A deficiency in mounting an adaptive immune response to Cm infection was demonstrated using a splenocyte recall assay. Although preliminary in nature, these findings are suggestive of fetuin-A involvement following Cm pulmonary infection and underscores the need to investigate further the role of fetuin-A in the immune response and the consequences of its gene deletion.
Insights
Fetuin-A negatively regulates inflammation during Chlamydia muridarum lung infection. Its deficiency increases IFN-γ production, highlighting fetuin-A
Area of Science:
- Immunology
- Infectious Diseases
- Biochemistry
Background:
- Fetuin-A is an acute phase glycoprotein that modulates inflammatory responses.
- Maintaining homeostasis during inflammation involves counteracting pro-inflammatory cytokines.
Purpose of the Study:
- To investigate the role of fetuin-A in the immune response to Chlamydia muridarum (Cm) pulmonary infection.
- To determine if fetuin-A deficiency impacts inflammation and adaptive immunity following Cm challenge.
Main Methods:
- Intranasal challenge of wild-type and fetuin-A-deficient (AHSG) mice with Chlamydia muridarum.
- Quantification of fetuin-A and Interferon-gamma (IFN-γ) in lung tissue.
- Assessment of inflammatory gene expression (TBX21) and splenocyte recall assays.
Main Results:
- Fetuin-A levels decreased while IFN-γ increased in wild-type mice post-Cm infection.
- Increased IFN-γ production following Cm infection was abrogated in fetuin-A-deficient mice.
- Fetuin-A deficiency led to altered expression of inflammatory genes and impaired adaptive immune response.
Conclusions:
- Fetuin-A plays a significant, likely negative regulatory role in the pulmonary immune response to Chlamydia muridarum.
- IFN-γ induction and Th1 cell responses during Cm infection are, in part, fetuin-A dependent.
- Further investigation into fetuin-A's function in infectious immunity and the consequences of its deletion is warranted.
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