Journal
DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY
Volume 121, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dci.2021.104080
Keywords
Tetraspanin; CD9; Porcine; Lymphocyte; Memory
Categories
Funding
- Boehringer Ingelheim Vetmedica GmbH
- Austrian Federal Ministry for Digital and Economic Affairs
- National Foundation for Research, Technology and Development
- Christian Doppler Research Association
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In this study, two novel monoclonal antibodies specific for porcine CD9 were reported. CD9 expression was found on a wide range of porcine immune cell subsets, with a correlation between CD9 expression and central memory CD4 T cells. The antibodies enable the detection of a cell surface molecule with functional relevance to T cells, benefiting swine biomedical research.
In this work, we report on two novel monoclonal antibodies, specific for porcine CD9. CD9 is a tetraspanin that is expressed on a wide variety of cells. We phenotyped porcine immune cell subsets and found that CD9 was expressed on all monocytes as well as a subset of B cells. CD9 was variably expressed on T cells, with CD4 T cells containing the highest frequency of CD9+ cells. CD9 expression positively correlated with the frequency of central memory CD4 T cells in ex vivo PBMC. Therefore, we proceeded to explore CD9 as a marker of T cell function. Here we observed that CD9 was expressed on the vast majority of long-lived influenza A virus-specific effector cells that retained the capacity for cytokine production in response to in vitro recall antigen. Therefore, the new antibodies enable the detection of a cell surface molecule with functional relevance to T cells. Considering the importance of CD9 in membrane remodelling across many cell types, they will also benefit the wider field of swine biomedical research.
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