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Higher expression of annexin A1 in 1 CD56+ than in CD56-T cells: Potential implications for coronary artery disease
Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för kardiovaskulär medicin. Linköpings universitet, Hälsouniversitetet.
Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för kardiovaskulär medicin. Linköpings universitet, Hälsouniversitetet.
Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University, The Netherlands.
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för inflammationsmedicin. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Diagnostikcentrum, Klinisk immunologi och transfusionsmedicin.
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2014 (Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Abstract [en]

Background: Increased proportions of circulating proinflammatory CD56+ T cells have been reported in patients with coronary artery disease (CAD). Yet, little is known about regulation of these cells. In the present study, we investigated the expression and potential role of the glucocorticoid-mediated protein annexin A1 (AnxA1) in CD56+ and CD56-T cell subsets, with focus on CAD.

Methods and Results: We included totally 52 healthy individuals, 28 patients with acute coronary syndrome (ACS) and 57 patients with a history of ACS. AnxA1 mRNA expression was assessed in peripheral blood mononuclear cells. AnxA1 protein expression (total and cell surface-associated) was measured by whole blood flow cytometry in circulating CD56+ and CD56- T cell subsets. Furthermore, inhibitory effects of dexamethasone and/or recombinant AnxA1 on cytokine secretion by CD56+ and CD56- T cells were explored in vitro. We found that CD56+ T cells (the majority CD8+), expressed higher levels of AnxA1 mRNA and protein than did CD56- T cells. When comparing CAD patients with healthy controls, significantly higher levels of cell surface-associated AnxA1 expression were seen in patients, most pronounced in ACS patients. In vitro, dexamethasone reduced cytokine secretion by CD56+ T cells, whereas AnxA1 alone had no effect, and AnxA1 combined with dexamethasone abolished the dexamethasone-induced suppressive effects.

Conclusion: AnxA1 was expressed more abundantly in proinflammatory CD56+ T cells. Patients with ACS exhibited increased levels of cell surface-associated AnxA1, thus indicating increased activation of the AnxA1 pathway. Our data further suggested that AnxA1 might counteract glucocorticoid mediated anti-inflammatory effects in T cells.

Ort, förlag, år, upplaga, sidor
2014.
Nyckelord [en]
Annexin A1, T cell, CD56, coronary artery disease, acute coronary syndrome
Nationell ämneskategori
Kardiologi Cell- och molekylärbiologi
Identifikatorer
URN: urn:nbn:se:liu:diva-114121OAI: oai:DiVA.org:liu-114121DiVA, id: diva2:787333
Tillgänglig från: 2015-02-10 Skapad: 2015-02-10 Senast uppdaterad: 2018-01-11Bibliografiskt granskad
Ingår i avhandling
1. Pro- and anti-inflammatory actions in coronary artery disease: with focus on CD56+ T cells and Annexin A1
Öppna denna publikation i ny flik eller fönster >>Pro- and anti-inflammatory actions in coronary artery disease: with focus on CD56+ T cells and Annexin A1
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

¨The atherosclerotic process is considered to be driven by an imbalance between proand anti-inflammatory actions. Still, the inflammatory state in patients with coronary artery disease (CAD) remains to be clarified. Annexin A1 (AnxA1) is a glucocorticoidinduced protein which may have a key role in the anti-inflammatory response as a mediator of glucocorticoid effects.

The general aim of this thesis was to deepen the knowledge of pro- and antiinflammatory mechanisms in CAD via phenotypic assessments of immune cell subsets, in particular CD56+ T cells, and exploration of AnxA1. The long-term goal is to reveal basic mechanisms that will lead to the development of biomarkers, which may be used for individualized treatment and monitoring.

The AnxA1 protein was constitutively expressed in both neutrophils and peripheral blood mononuclear cells (PBMCs). However, it varied considerably across PBMC subsets, being most abundantly expressed in monocytes. The AnxA1 expression was also higher in CD56+ T cells than in CD56- T cells.

The expression of total AnxA1 protein in neutrophils was higher in patients with stable angina (SA) compared with controls. However, this was not accompanied by altered neutrophil activation status. Instead, the neutrophils from patients exhibited an enhanced anti-inflammatory response to exogenous AnxA1, emphasizing the potential of AnxA1 as an inhibitor of neutrophil activity. Only patients with acute coronary syndrome (ACS) showed an increase in cell surface-associated AnxA1.

CAD patients, independent of clinical presentation, had increased proportions of CD56+ T cells compared with controls, a phenomenon likely to represent immunological aging. The CD56+ T cells were found to exhibit a distinct proinflammatory phenotype compared with CD56- T cells. In all T cell subsets, the expression of cell surface-associated AnxA1 was significantly increased in ACS patients, while it tended to be increased in post-ACS patients. In addition, dexamethasone clearly inhibited activation of CD56+ T cells in in vitro assays, whereas AnxA1 did not. The findings highlight the need to clarify whether the role of AnxA1 is different in T cells than in innate immune cells.

In PBMCs, the mRNA levels of AnxA1 were increased in CAD patients, particularly in ACS patients. Correspondingly, the monocytes in ACS patients exhibited increased AnxA1 protein levels, both totally and on the cell surface. However, only cell surface-associated AnxA1 in monocytes correlated with the glucocorticoid sensitivity of PBMCs ex vivo. We propose the expression of cell surfaceassociated AnxA1 to be a promising candidate marker of glucocorticoid sensitivity, which needs further investigations in larger cohorts and intervention trials. Furthermore, the fact that PBMCs in post-ACS patients exhibited pro-inflammatory activity but no increase in cell surface-associated AnxA1 allow us to speculate that the glucocorticoid action and/or availability might be insufficient in these patients.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2015. s. 83
Serie
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1437
Nationell ämneskategori
Kardiologi Immunologi inom det medicinska området Medicin och hälsovetenskap
Identifikatorer
urn:nbn:se:liu:diva-114123 (URN)10.3384/diss.diva-114123 (DOI)978-91-7519-150-8 (ISBN)
Disputation
2015-03-13, Berzeliussalen, Campus US, Linköpings universitet, Linköping, 09:00 (Svenska)
Opponent
Handledare
Tillgänglig från: 2015-02-10 Skapad: 2015-02-10 Senast uppdaterad: 2018-01-11Bibliografiskt granskad

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