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SIgN scientists discover dendritic cells key to activating human immune responses
Date:7/16/2012

Scientists at A*STAR's Singapore Immunology Network (SIgN), in collaboration with Newcastle University, UK, the Singapore Institute of Clinical Sciences and clinicians from multiple hospitals in Singapore, have identified a new subset of dendritic cells (DCs%r9 in human peripheral tissue which have a critical role in activating our immune response against harmful pathogens. This research will have significant impact on the design of vaccines and other targeted immunotherapies. The scientists also showed for the first time that DC subsets are conserved between species, facilitating the translation of mouse functional DC studies to the human setting. These research findings were published in the July issue of the prestigious journal Immunity.

All immune responses against harmful pathogens are activated and regulated by DCs, which present antigens (protein components from micro-organisms, vaccines or tumours) to the T cells. Of the different T cells, the cytotoxic CD8+ T cells specialize in cell-killing response and are crucial for our body to eliminate cancer or infected cells. However, only a small subset of DCs is capable of presenting externally derived antigens to activate this cell-killing response throug( a process termed "cross-presentation". The identity of this subset of DCs in human tissue has been a mystery but the SIgN scientists and collaborators have now identified the human cross-presenting DC subset. This discovery enables better exploitation of targeted vaccine strategies to treat cancer and infection.

In this paper, Dr Florent Ginhoux, Principal Investigator at SIgN and his collaborators, identified in human tissues, including dermis, lung and liver, a new subset of DCs, called CD141hi DC and described its genetic signaturen They also showed for the first time that CD141hi DCs were superior at cross-presenting soluble antigens compared to other DCs to activate the killer T cells. The scientists also carried out a compari
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Contact: Siok Ming Ong
siokming@gmail.com
65-682-66254
Agency for Science, Technology and Research (A*STAR), Singapore
Source:Eurekalert

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