Volume 12 Supplement 1

Abstracts from the 1st Annual Meeting of the Scottish Society of Cytomics (SCC) 2014. "Translational Cytometry from Bench to Bedside"

Open Access

Characterisation of the murine C-type lectin receptor CLECSF8 (MCL) reveals its expression on cells of the monocyte/neutrophil lineages and an inter-dependence with Mincle, but not Dectin-2

  • Bernhard Kerscher1Email author,
  • Gillian J Wilson1,
  • Delyth M Reid1,
  • Sho Yamasaki2,
  • Janet A Willment1 and
  • Gordon D Brown1
Journal of Inflammation201512(Suppl 1):P4

https://doi.org/10.1186/1476-9255-12-S1-P4

Published: 16 April 2015

Background

C-type lectin-like receptors (CTLRs) play critical roles in immunity and homeostasis by recognising a great variety of microbial or endogenous ligands [1]. CLECSF8 is a member of the Dectin–2 family of CTLRs. Previous research indicates that CLECSF8 associates with the FcRγ adaptor, which is essential for surface expression and signalling through the SYK/CARD9 pathway. Recently, the mycobacterial cord factor (TDM, trehalose-6,6’-dimycolate) was identified as the ligand of CLECSF8, as shown previously for the closely related CTLR Mincle [2]. Indeed, we recently showed that CLECSF8 plays a critical role in human and murine anti-mycobacterial immunity [3]. In this study, we characterised CLECSF8 expression in the mouse under naïve and inflammatory conditions.

Materials and methods

We used newly generated anti-CLECSF8 monoclonal antibodies (mAB) to assess receptor expression in the mouse by flow cytometry. The co-dependence of CLECSF8 and Mincle or Dectin-2 was investigated in a transfected fibroblast cell line and primary CLECSF8-/- cells.

Results

We selected mAB clone 3A4, which was able to recognise CLECSF8 by ELISA and western blot to analyse CLECSF8 expression in the mouse by flow cytometry. While CLECSF8 transcript was widely expressed, CLECSF8 protein expression was predominantly found on monocytes/macrophages and neutrophils within e. g. the peritoneal cavity, blood and bone marrow. Notably, CLECSF8 was expressed only weakly in the lung, but strongly upregulated in a pulmonary Mycobacterium bovis BCG infection model. In vitro, CLECSF8 expression on thioglycollate elicited macrophages was strongly induced upon treatment with TLR agonists or microbial stimuli.

In agreement with previous reports, our data suggests that CLECSF8 associates with the signalling adaptor FcRγ. Interestingly, surface expression of CLECSF8 in a murine fibroblast cell line was greatly enhanced by co-transfection of Mincle, but not Dectin-2. Intriguingly, Mincle expression mirrored CLECSF8 expression in our in vitro stimulation experiments. Further analyses on wild-type and CLECSF8-/- primary macrophages in vitro, or cells harvested after intra-peritoneal and intra-tracheal instillation of BCG demonstrated a lack of Mincle-upregulation in the absence of CLECSF8.

Conclusion

CLECSF8 is a predominantly monocyte/macrophage and neutrophil expressed receptor, showing significant interdependence with Mincle, but not Dectin-2.

Authors’ Affiliations

(1)
Institute of Medical Sciences, Aberdeen Fungal Group, University of Aberdeen
(2)
Research Center for Infectious Diseases, Kyushu University

References

  1. Kerscher B, Willment JA, Brown GD: The Dectin-2 family of C-type lectin-like receptors: an update. Int Immunol. 2013, 25: 271-277. 10.1093/intimm/dxt006.PubMed CentralView ArticlePubMedGoogle Scholar
  2. Miyake Y, Toyonaga K, Mori D, Kakuta S, Hoshino Y, Oyamada A, Yamada H, Ono K, Suyama M, Iwakura Y, et al: C-type lectin MCL is an FcRgamma-coupled receptor that mediates the adjuvanticity of mycobacterial cord factor. Immunity. 2013, 38: 1050-1062. 10.1016/j.immuni.2013.03.010.View ArticlePubMedGoogle Scholar
  3. Wilson GJ, Marakalala MJ, Hoving JC, van Laarhoven A, Drummond RA, Kerscher B, Keeton R, van de Vosse E, Ottenhoff TH, Plantinga TS, Alisjahbana B, Govender D, Besra GS, Netea MG, Reid DM, Willment JA, Jacobs M, Yamasaki S, van Crevel R, Brown GD: The C-Type Lectin Receptor CLECSF8/CLEC4D Is a key component of anti-mycobacterial immunity. Cell Host Microbe. 2015, 17 (2): 252-259. 10.1016/j.chom.2015.01.004.PubMed CentralView ArticlePubMedGoogle Scholar

Copyright

© Kerscher et al; licensee BioMed Central Ltd. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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