Abstract
Movement toward the source of a chemoattractant gradient is a basic cellular property in health and disease. Enhanced migration during metastasis involves deregulated growth factor signaling. Growth factor stimulation and cell migration converge both on the important second messenger Ca2+. To date, the molecular identification of Ca2+ entry pathways activated by growth factors during chemotaxis is still an open issue. We investigated the involvement of the nonselective Ca2+ channel TRPC1 (transient receptor potential canonical 1) in FGF-2 guided chemotaxis by means of time-lapse video microscopy and by functional Ca2+ measurements. To specifically address TRPC1 function in transformed MDCK cells we altered the expression levels by siRNA or overexpression. We report that TRPC1 channels are required for the orientation of transformed MDCK cells in FGF-2 gradients because TRPC1 knockdown or pharmacological blockade prevented chemotaxis. Stimulation with FGF-2 triggered an immediate Ca2+ influx via TRPC1 channels that depended on phospholipase C and phosphatidylinositol 3-kinase signaling. Impeding this Ca2+ influx abolished chemotaxis toward FGF-2. This functional connection correlated with clustering of FGF receptors and TRPC1 channels as was observed by immunolabeling. These findings show the important interplay between growth factor signaling and Ca2+ influx in chemotaxis.
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Acknowledgement
This work was supported by grants from the Rolf-Dierichs-Stiftung (Medical Faculty, University Münster) (grant number: 193423) and from the Boehringer Ingelheim Fonds to A.F.. A.S. was supported by the IZKF Münster (grant number: Schw 2/030/08) and by the Deutsche Forschungsgemeinschaft (grant number: Schw 407/9-3).
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All experiments were performed in accordance with the ethical standards required by Pflügers Archiv–European Journal of Physiology.
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The authors declare that they have no conflict of interest.
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Anke Fabian and Thomas Fortmann contributed equally to this work.
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Fig. S1
Expression of TRPC3 channels
We determined TRPC3 expression in all four cell lines employed in our study: hTRPC1-HA overexpressing cells and the corresponding control cells transfected with an “empty” pcDNA3 expression vector as well as siTRPC1 cells and the corresponding control cells transfected with the pSUPER.retro.puro vector containing a mock oligo. The results of these experiments are summarized in fig. S1.
Western blot analysis of TRPC3 expression in MDCK-F cells with modified TRPC1 expression and in the respective control cell lines. The TRPC3 antibody (alomone) detects a single band of the expected size. Loading of equal amounts of protein was verified by normalizing TRPC3 expression to that of β-actin (fig. S1A). Fig. S1B shows the statistical analysis of four experiments. TRPC3 expression is identical in all four cell lines used in this study.
Knock-down of TRPC3 channels
TRPC3 expression was transiently knocked-down with siRNA technology (Qiagen, Germany) by using the following targeting sequences:
TRPC3_1 (sense, GCUUGUAUUCAAUGCCUCAUU; antisense, UGAGGCAUUGAAUACAAGCAG), TRPC3_2 (sense, CGUGGACAGUUAUGUCCAAUU; antisense, UUGGACAUAACUGUCCACGUA). As a control, a scramled siRNA (sense, AGAUCCGUAUAGUGUACCUUA; antisense, UAAGGUACACUAUACGGAUCU, synthesized by Dharmacon, USA) was used.
siTRPC1-MCDK-F cells were transiently transfected using the transfection reagent Fugene® 6 (Roche, Germany). To this end, cells were grown in a 60mm dish at 80% confluency. Transfection was performed using 3 µl of the transfection reagent with 25nM or 100nM siRNA. After 24 hours the transfection medium was removed and the cells were incubated with serum-free medium for another 24 hours.
48 h post transfection cells were pretreated with 10 ng/ml FGF-2 for 3 h and either used for Western blot analysis of TRPC3 expression or for measurements of the intracellular Ca2+ concentration according to the protocols described in the Methods section.
Reducing TRPC3 expression by 50 – 60 % has no effect on [Ca2+]i of siTRPC1-MDCK-F cells when compared to cells treated with scrambled control siRNA. (PPT 145 kb)
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Fabian, A., Fortmann, T., Bulk, E. et al. Chemotaxis of MDCK-F cells toward fibroblast growth factor-2 depends on transient receptor potential canonical channel 1. Pflugers Arch - Eur J Physiol 461, 295–306 (2011). https://doi.org/10.1007/s00424-010-0901-6
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DOI: https://doi.org/10.1007/s00424-010-0901-6