0000000000037773
AUTHOR
Kristina Goetze
Low density lipoprotein receptor-related protein 1 mediated endocytosis of β1-integrin influences cell adhesion and cell migration.
The low density lipoprotein receptor-related protein 1 (LRP1) has been shown to interact with β1-integrin and regulate its surface expression. LRP1 knock-out cells exhibit altered cytoskeleton organization and decreased cell migration. Here we demonstrate coupled endocytosis of LRP1 and β1-integrin and the involvement of the intracellular NPxY2 motif of LRP1 in this process. Mouse embryonic fibroblasts harboring a knock in replacement of the NPxY2 motif of LRP1 by a multiple alanine cassette (AAxA) showed elevated surface expression of β1-integrin and decreased β1-integrin internalization rates. As a consequence, cell spreading was altered and adhesion rates were increased in our cell model…
Feasibility of an induced metabolic bioluminescence imaging technique in ovarian cancer: Results of a pilot study.
e17093Background: The precise determination of energy metabolites is challenged by the heterogeneity of their distribution, their rapid changes after surgical resection and the architectural comple...
The impact of conventional and heavy ion irradiation on tumor cell migration in vitro.
The influence of X-ray and (12)C heavy ion irradiation on tumor cell migration and of beta(3) and beta(1) integrin expression was investigated.Two different tumor cell lines (U87 glioma and HCT116 colon carcinoma cells) were irradiated with 1, 3, or 10 Gy X-rays or (12)C heavy ions. 24 h after irradiation a standardized Boyden Chamber assay for migration analysis was performed and cells were lysed for Western blotting.Radiation-induced influences were cell line- and radiation type-dependent. X-rays decreased HCT116 migration at higher doses and appear to increase U87 migration after 3 Gy. Heavy ions decreased migration of both cell lines dose-dependently. A trend of increased beta(3) and be…
Lactate enhances motility of tumor cells and inhibits monocyte migration and cytokine release.
In solid malignant tumors, lactate has been identified as a prognostic parameter for metastasis and overall survival of patients. To investigate the effects of lactate on tumor cell migration, Boyden chamber assays were applied. We could show here that lactate enhances tumor cell motility of head and neck carcinoma cell lines significantly in a dose-dependent manner. The changes in tumor cell migration could be attributed to L-lactate or a conversion of lactate to pyruvate, as only these two substances were able to increase migration. Addition of D-lactate or changes in osmolarity or intracellular pH did not alter the migratory potential of the cells investigated. Because lactate was shown …