TY  - JOUR
A1  - Butt, Elke
A1  - Stempfle, Katrin
A1  - Lister, Lorenz
A1  - Wolf, Felix
A1  - Kraft, Marcella
A1  - Herrmann, Andreas B.
A1  - Viciano, Cristina Perpina
A1  - Weber, Christian
A1  - Hochhaus, Andreas
A1  - Ernst, Thomas
A1  - Hoffmann, Carsten
A1  - Zernecke, Alma
A1  - Frietsch, Jochen J.
T1  - Phosphorylation-dependent differences in CXCR4-LASP1-AKT1 interaction between breast cancer and chronic myeloid leukemia
JF  - Cells
N2  - The serine/threonine protein kinase AKT1 is a downstream target of the chemokine receptor 4 (CXCR4), and both proteins play a central role in the modulation of diverse cellular processes, including proliferation and cell survival. While in chronic myeloid leukemia (CML) the CXCR4 is downregulated, thereby promoting the mobilization of progenitor cells into blood, the receptor is highly expressed in breast cancer cells, favoring the migratory capacity of these cells. Recently, the LIM and SH3 domain protein 1 (LASP1) has been described as a novel CXCR4 binding partner and as a promoter of the PI3K/AKT pathway. In this study, we uncovered a direct binding of LASP1, phosphorylated at S146, to both CXCR4 and AKT1, as shown by immunoprecipitation assays, pull-down experiments, and immunohistochemistry data. In contrast, phosphorylation of LASP1 at Y171 abrogated these interactions, suggesting that both LASP1 phospho-forms interact. Finally, findings demonstrating different phosphorylation patterns of LASP1 in breast cancer and chronic myeloid leukemia may have implications for CXCR4 function and tyrosine kinase inhibitor treatment.
KW  - LASP1
KW  - CXCR4
KW  - AKT1
KW  - CML
KW  - breast cancer
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-200638
SN  - 2073-4409
VL  - 9
IS  - 2
ER  - 
TY  - JOUR
A1  - Simsekyilmaz, Sakine
A1  - Liehn, Elisa A.
A1  - Weinandy, Stefan
A1  - Schreiber, Fabian
A1  - Megens, Remco T. A.
A1  - Theelen, Wendy
A1  - Smeets, Ralf
A1  - Jockenhövel, Stefan
A1  - Gries, Thomas
A1  - Möller, Martin
A1  - Klee, Doris
A1  - Weber, Christian
A1  - Zernecke, Alma
T1  - Targeting In-Stent-Stenosis with RGD- and CXCL1-Coated Mini-Stents in Mice
JF  - PLoS ONE
N2  - Atherosclerotic lesions that critically narrow the artery can necessitate an angioplasty and stent implantation. Long-term therapeutic effects, however, are limited by excessive arterial remodeling. We here employed a miniaturized nitinol-stent coated with star-shaped polyethylenglycole (star-PEG), and evaluated its bio-functionalization with RGD and CXCL1 for improving in-stent stenosis after implantation into carotid arteries of mice. Nitinol foils or stents (bare metal) were coated with star-PEG, and bio-functionalized with RGD, or RGD/CXCL1. Cell adhesion to star-PEG-coated nitinol foils was unaltered or reduced, whereas bio-functionalization with RGD but foremost RGD/CXCL1 increased adhesion of early angiogenic outgrowth cells (EOCs) and endothelial cells but not smooth muscle cells when compared with bare metal foils. Stimulation of cells with RGD/CXCL1 furthermore increased the proliferation of EOCs. In vivo, bio-functionalization with RGD/CXCL1 significantly reduced neointima formation and thrombus formation, and increased re-endothelialization in apoE\(^{-/-}\) carotid arteries compared with bare-metal nitinol stents, star-PEG-coated stents, and stents bio-functionalized with RGD only. Bio-functionalization of star-PEG-coated nitinol-stents with RGD/CXCL1 reduced in-stent neointima formation. By supporting the adhesion and proliferation of endothelial progenitor cells, RGD/CXCL1 coating of stents may help to accelerate endothelial repair after stent implantation, and thus may harbor the potential to limit the complication of in-stent restenosis in clinical approaches.
KW  - carotid arteries
KW  - polymers
KW  - stent implantation
KW  - coatings
KW  - endothelial cells
KW  - mice
KW  - fluorescence microscopy
KW  - stem cells
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-179745
VL  - 11
IS  - 5
ER  -