Farhat, Katja

[["dc.bibliographiccitation.firstpage","34"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Veterinary research"],["dc.bibliographiccitation.lastpage","34"],["dc.bibliographiccitation.volume","41"],["dc.contributor.author","Farhat, Katja"],["dc.contributor.author","Riekenberg, Sabine"],["dc.contributor.author","Jung, Günther"],["dc.contributor.author","Wiesmüller, Karl-Heinz"],["dc.contributor.author","Jungi, Thomas W."],["dc.contributor.author","Ulmer, Artur J."],["dc.date.accessioned","2019-07-09T11:53:04Z"],["dc.date.available","2019-07-09T11:53:04Z"],["dc.date.issued","2010"],["dc.description.abstract","Toll-like receptors (TLR) are highly conserved pattern recognition receptors of the innate immune system. Toll-like receptor 2 (TLR2) recognizes bacterial lipopeptides in a heterodimeric complex with TLR6 or TLR1, thereby discriminating between di- or triacylated lipopeptides, respectively. Previously, we found that HEK293 cells transfected with bovine TLR2 (boTLR2) were able to respond to diacylated lipopeptides but did not recognize triacylated lipopeptides, even after cotransfection with the so far published sequence of boTLR1. In this study we now could show that primary bovine cells were in general able to detect triacylated lipopetides. A closer investigation of the boTLR1 gene locus revealed an additional ATG 195 base pairs upstream from the published start codon. Its transcription would result in an N-terminus with high identity to human and murine TLR1 (huTLR1, muTLR1). Cloning and cotransfection of this longer boTLR1 with boTLR2 now resulted in the recognition of triacylated lipopeptides by HEK293 cells, thereby resembling the ex vivo observation. Analysis of the structure-activity relationship showed that the ester-bound acid chains of these lipopeptides need to consist of at least 12 carbon atoms to activate the bovine heterodimer showing similarity to the recognition by huTLR2/huTLR1. In contrast, HEK293 cell cotransfected with muTLR2 and muTLR1 could already be activated by lipopeptides with shorter fatty acids of only 6 carbon atoms. Thus, our data indicate that the additional N-terminal nucleotides belong to the full length and functionally active boTLR1 (boTLR1-fl) which participates in a species-specific recognition of bacterial lipopeptides."],["dc.identifier.doi","10.1051/vetres/2010006"],["dc.identifier.fs","576969"],["dc.identifier.pmid","20167196"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6864"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60334"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","0928-4249"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject.ddc","610"],["dc.subject.mesh","Animals"],["dc.subject.mesh","Cattle"],["dc.subject.mesh","Cell Line"],["dc.subject.mesh","Gene Expression Regulation"],["dc.subject.mesh","Humans"],["dc.subject.mesh","Lipopeptides"],["dc.subject.mesh","Mice"],["dc.subject.mesh","Toll-Like Receptor 1"],["dc.subject.mesh","Toll-Like Receptor 2"],["dc.title","Identification of full length bovine TLR1 and functional characterization of lipopeptide recognition by bovine TLR2/1 heterodimer."],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1449"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Oncotarget"],["dc.bibliographiccitation.lastpage","1460"],["dc.bibliographiccitation.volume","4"],["dc.contributor.author","Rietkötter, Eva"],["dc.contributor.author","Menck, Kerstin"],["dc.contributor.author","Bleckmann, Annalen"],["dc.contributor.author","Farhat, Katja"],["dc.contributor.author","Schaffrinski, Meike"],["dc.contributor.author","Schulz, Matthias"],["dc.contributor.author","Hanisch, Uwe-Karsten"],["dc.contributor.author","Binder, Claudia"],["dc.contributor.author","Pukrop, Tobias"],["dc.date.accessioned","2019-07-10T08:11:45Z"],["dc.date.available","2019-07-10T08:11:45Z"],["dc.date.issued","2013-09-01"],["dc.description.abstract","The bisphosphonate zoledronic acid (ZA) significantly reduces complications of bone metastasis by inhibiting resident macrophages, the osteoclasts. Recent clinical trials indicate additional anti-metastatic effects of ZA outside the bone. However, which step of metastasis is influenced and whether thisis due to directtoxicity on cancer cells or inhibition of the tumor promoting microenvironment, is unknown. In particular, tumor-associated and resident macrophages support each step of organ metastasis and could be a crucial target of ZA. Thus, we comparatively investigate the ZA effects on: i) different types of macrophages, ii) on breast cancer cells but also iii) on macrophage-induced invasion. We demonstrate that ZA concentrations reflecting the plasma level affected viability of human macrophages, murine bone marrow-derived macrophages as well as their resident brain equivalents, the microglia, while it did not influence the tested cancer cells. However, the effects on the macrophages subsequently reduced the macrophage/microglia-induced invasiveness of the cancer cells. In line with this, manipulation of microglia by ZA in organotypic brain slice cocultures reduced the tissue invasion by carcinoma cells. The characterization of human macrophages after ZA treatment revealed a phenotype/response shift, in particular after external stimulation. In conclusion, we show that therapeutic concentrations of ZA affect all types of macrophages but not the cancer cells. Thus, anti-metastatic effects of ZA are predominantly caused by modulating the microenvironment. Most importantly, our findings demonstrate that ZA reduced microglia-assisted invasion of cancer cells to the brain tissue, indicating a potential therapeutic role in the prevention of cerebral metastasis."],["dc.identifier.fs","599082"],["dc.identifier.pmid","24036536"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10758"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60792"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","1949-2553"],["dc.relation.orgunit","Universitätsmedizin Göttingen"],["dc.rights","CC BY 3.0"],["dc.rights.uri","http://creativecommons.org/licenses/by/3.0"],["dc.subject.mesh","Animals"],["dc.subject.mesh","Breast Neoplasms"],["dc.subject.mesh","Cell Communication"],["dc.subject.mesh","Cell Line, Tumor"],["dc.subject.mesh","Cell Proliferation"],["dc.subject.mesh","Coculture Techniques"],["dc.subject.mesh","Diphosphonates"],["dc.subject.mesh","Female"],["dc.subject.mesh","Humans"],["dc.subject.mesh","Imidazoles"],["dc.subject.mesh","MCF-7 Cells"],["dc.subject.mesh","Macrophages"],["dc.subject.mesh","Matrix Metalloproteinases"],["dc.subject.mesh","Mice"],["dc.subject.mesh","Microglia"],["dc.subject.mesh","Tumor Microenvironment"],["dc.title","Zoledronic acid inhibits macrophage/microglia-assisted breast cancer cell invasion."],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]