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DOI: 10.1055/s-2007-980189
© Georg Thieme Verlag KG Stuttgart · New York
Pam3CSK4 and LTA-TLRs Ligands Associated with Microdomains Induce IL8 Production in Human Adrenocortical Cancer Cells
Publication History
received 25.8.2006
accepted 27.11.2006
Publication Date:
18 June 2007 (online)


Abstract
Bacterially derived ligands, Pam3CSK4 and LPS, can directly impact adrenal glands steroidogenesis through microdomain-related TLR1/2 and 4, respectively, and indirectly via immune cell-derived cytokines. The bilateral immunoadrenal relationship plays an important role in the proper functioning of both systems. CXC chemokine-dependent immune cell infiltration into adrenocortical carcinomas (ACC), which correlates with poor prognosis, is a common phenomenon. Recently, IL8 was identified in ACC and NCI-H295R cells, and was found to contribute to ACC tumour growth. The aim of this study was to clarify the role of different TLR ligands in IL8 production in NCI-H295R cells. This is the first study to demonstrate the expression of several TLRs including TLR1, 3, 6, 7 and 9 in human adrenocortical cells by using the RT-PCR approach. Only stimulation with TLR1/6 together with TLR2 ligands resulted in IL8 peptide and mRNA induction in a dose and time-dependent manner. Our data suggest that gram-positive bacteria-related TLR1/2/6 ligands might contribute to adrenal gland tumorigenesis via IL8 production.
Key words
Bacterial ligands - CXC chemokines - NCI-H295R - TLR1/2 - tumorigenesis - microdomains