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Although SARS-CoV cannot infect or replicate in fully differentiated cells, it is possible to study the virus in infected bronchoalveolar stem cells [49]. Using this method, Mallick et?al. showed that miR-223 http://www.selleckchem.com/products/poziotinib-hm781-36b.html amongst other miRNAs is downregulated during infection. Furthermore, they demonstrated potential targets of miR-223 in both the virus (N protein) and the host (CCR1), although these targets remain to be validated. In another study, it was found that miR-223 is elevated in serum from patients with chronic type B hepatitis, to a similar extent as in patients with hepatocellular carcinoma (HCC), suggesting it may be a marker of liver injury [50]. Although it is not clear how higher levels in the serum relate to the expression levels of this miRNA in cells, it is tempting to speculate from the finding that miR-223 is downregulated in HCC and that it may also be downregulated in chronic type B hepatitis. As discussed above, miR-223 may act as a negative regulator of inflammation, which could explain the chronic inflammatory response in the liver if miR-223 is repressed. As miRNAs target RNA in the http://www.selleck.cn/products/cobimetinib-gdc-0973-rg7420.html cytoplasm, it was speculated that they could act as antiviral immune defence mechanisms against RNA viruses. Indeed, miR-223 expression correlates with susceptibility of T cells as well as monocytes/macrophages with HIV-1 infection [51, 52]. Furthermore, together with other miRNAs, miR-223 was found to target the 3�� ends of HIV-1 messenger RNAs. In resting CD4+ T cells (where HIV replication is silenced), miR-223 expression was increased compared with the level in activated CD4+ T cells. Inhibition of miR-223 alone or in combination with other miRNAs resulted in HIV-1 production from resting CD4+ T cells [51]. The physiological relevance of this finding is still questionable as resting CD4+ T cells are not the main reservoir of HIV ( http://www.selleckchem.com/products/ganetespib-sta-9090.html are induced by type I interferons, which could be one of the mechanisms of their antiviral activity [53]. Given the pronounced effects on the immune system as a whole, we can expect that in the near future, more studies will be reported regarding the role of miR-223 and infection. Given the prominent role of miR-223 in the immune system, it is not surprising that it is commonly found to be deregulated in leukaemia and lymphomas. AML1/ETO, the most common fusion protein in acute myeloid leukaemia (AML), reduces miR-223 expression via chromatin remodelling [54]. As described above, miR-223 induces differentiation of myeloid progenitor cells by targeting NFI-A. As a result, AML1/ETO-expressing cells maintain an undifferentiated state with increased proliferative potential.