Abstract:
:Candida albicans is an opportunistic fungal pathogen that colonizes human gastro-intestinal mucosal tissues. Its effect on the immune response in intestinal epithelial cells and on the intestinal mucosal barrier are not yet fully understood. In this study, we investigated Caco-2 cells, a monolayer model of intestinal epithelial cells, with or without treatment with C. albicans SC5314 (CA) or heat-inactivated CA (CA-inact). RNA sequencing was conducted, and the mRNA and protein levels of NOD-like receptor pyrin domain-containing protein 3 (NLRP3) or NLRP6/ASC/caspase-1 inflammasome signaling pathway components, inflammatory cytokines (interleukin-18 [IL-18] and IL-1β), anti-microbial peptides (AMPs; β-defensin-2 [BD-2], BD-3, and LL-37), and tight junction proteins (occludin and zona occludens-1 [ZO-1]) were examined by real-time PCR, western blotting, and/or immunofluorescence microscopy. Lactase dehydrogenase (LDH) activity in the Caco-2 cell supernatant were measured by enzyme kinetics analysis. Our results showed that the NOD-like receptor signaling pathway participates in the CA- and CA-inact-infected Caco-2 cells, as shown by microarray analysis of total mRNA expression. The expression of NLRP3, NLRP6, ASC, BD-2, BD-3, occludin, and ZO-1 were significantly decreased in Caco-2 cells infected with CA and CA-inact compared to that in the untreated control. IL-1β expression was decreased in the Caco-2 cells in both the CA- and CA-inact-infected groups compared to that in the control. Caspase-1 and IL-18 levels were not markedly affected by CA or CA-inact in Caco-2 cells. Our findings indicate that CA can inhibit the NLRP3 and NLRP6 pathways and dampen human intestinal mucosal barrier activity by decreasing the production of AMPs and tight junction proteins, independent of CA activity.
journal_name
Cytokinejournal_title
Cytokineauthors
Mao X,Qiu X,Jiao C,Lu M,Zhao X,Li X,Li J,Ma J,Zhang Hdoi
10.1016/j.cyto.2019.154882subject
Has Abstractpub_date
2020-02-01 00:00:00pages
154882eissn
1043-4666issn
1096-0023pii
S1043-4666(19)30311-4journal_volume
126pub_type
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