TGFβ1 signaling via αVβ6 integrin
© Kracklauer et al; licensee BioMed Central Ltd. 2003
Received: 02 June 2003
Accepted: 07 August 2003
Published: 07 August 2003
The Retraction Note to this article has been published in Molecular Cancer 2004 3:2
Transforming growth factor β1 (TGFβ1) is a potent inhibitor of epithelial cell growth, thus playing an important role in tissue homeostasis. Most carcinoma cells exhibit a reduced sensitivity for TGFβ1 mediated growth inhibition, suggesting TGFβ1 participation in the development of these cancers. The tumor suppresor gene DPC4/SMAD4, which is frequently inactivated in carcinoma cells, has been described as a key player in TGFβ1 mediated growth inhibition. However, some carcinoma cells lacking functional SMAD4 are sensitive to TGFβ1 induced growth inhibition, thus requiring a SMAD4 independent TGFβ1 pathway.
Here we report that mature TGFβ1 is a ligand for the integrin αVβ6, independent of the common integrin binding sequence motif RGD. After TGFβ1 binds to αVβ6 integrin, different signaling proteins are activated in TGFβ1-sensitive carcinoma cells, but not in cells that are insensitive to TGFβ1. Among others, interaction of TGFβ1 with the αVβ6 integrin resulted in an upregulation of the cell cycle inhibitors p21/WAF1 and p27 leading to growth inhibition in SMAD4 deleted as well as in SMAD4 wildtype carcinoma cells.
Our data provide support for the existence of an alternate TGFβ1 signaling pathway that is independent of the known SMAD pathway. This alternate pathway involves αVβ6 integrin and the Ras/MAP kinase pathway and does not employ an RGD motif in TGFβ1-sensitive tumor cells. The combined action of these two pathways seems to be necessary to elicit a complete TGFβ1 signal.
KeywordsTGFβ1 signaling cytoskeleton growth inhibition integrin.
The normal function of transforming growth factor β1 (TGFβ1) is essential for the entire organism, representing a multifunctional regulator of cell growth and differentiation [1–5]. TGFβ1 is a potent inhibitor of epithelial cell proliferation. Upon binding of TGFβ1, TGFβ1-receptors phosphorylate SMAD2 or SMAD3 [6–12]. Phosphorylated SMAD2/3 associates with SMAD4 and, as a complex, moves into the nucleus, where it regulates gene expression [13–15].
SMAD4 (DPC4) is essential for this TGFβ1 signaling and transcriptional activation process . In epithelial cells, TGFβ1 decreases c-myc, cdc2 and cyclin D1 expression, and it increases the expression of c-jun and c-fos [17–23]. Activation of the TGFβ1 signal pathway in epithelial cells leads to an increased expression of the cell cycle inhibitors p21WAF1 and p15Ink4b and to a release of formerly sequestered p27KIP [24–26]. It is assumed that the cooperative action of these cell cycle inhibitors results in the growth arrest mentioned above, although p15Ink4b does not seem to be necessary in this regard. In addition to mutations in the TGFβ1-receptors, in a large number of carcinomas disruptions of this signaling pathway by the alteration of a single protein such as p15Ink4b, p16, and p21Waf1 are found [2, 27–39]. This may result in resistance to the growth-inhibiting action of TGFβ1.
In several cell lines, particularly in pancreatic carcinoma cells, resistance to TGFβ1 could be attributed to a loss of function of the SMAD4 (DPC4) protein [40–43]. However, the pancreatic carcinoma cell line BxPC-3, although homozygously deleted for SMAD4, is growth inhibited by TGFβ1 [30, 44]. It is thus speculated that alternative signaling pathways in addition to the SMAD pathway may exist.
After binding to αVβ6 integrin, latent TGFβ1 is activated by processing of latent TGFβ1 by cleavage of the latency-associated Peptide (LAP) [45–57]. Recently, the interaction of latent TGFβ1 with αVβ6 integrin has been shown . After binding of latent TGFβ1 to αVβ6 integrin, latent TGFβ1 is activated by cleavage of the latency-associated peptide (LAP) . This αVβ6 integrin is also expressed by pancreatic carcinoma cells [58–63]. We hypothesized that there is a SMAD-independent TGFβ1 signaling pathway in TGFβ1-sensitive carcinoma cells. To address this question, several carcinoma cell lines with different degrees of TGFβ1 sensitivity were chosen as a model system. We investigated the interaction of TGFβ1 with the αVβ6 integrin and its influence on selected target genes known to be involved in cell cycle-regulated growth inhibition. Here, we demonstrate an alternate TGFβ1 signaling pathway via αVβ6 integrin contributing to TGFβ1 growth inhibiton in TGFβ1 sensitive carcinoma cells.
Mature TGFβ1 induces cytoskeletal immobilization of proteins and tyrosine phosphorylation via integrin αVβ6 only in TGFβ1 sensitive cells
SMAD4 status and TGFβ1 response of selected tumor cell lines were: (1) confirmed by PCR sequencing (data not shown) and (2) by [3H] thymidine incorporation assays (data not shown). WT denotes wild type.
Growth inhibition2 by TGFβ1
- (homozygous deleted)
- (frame shift mutation)
- (amino acid replacement)
Activation of p125FAK, a central step in integrin-associated signaling [72, 73], was determined to assess integrin-mediated signaling. BcPC-3 cells are sensitive to TGFβ1 but are SMAD4 deleted. We incubated BxPC-3 cells with mature TGFβ1 and observed an association on the cytoskeleton connected with integrin αVβ6 and activation of p125FAK (Figure 4). Indeed, TGFβ1 antibodies, cytochalasin D and BAPTA-AM  abolished the association on the cytoskeleton connected with integrin αVβ6 and activation of p125FAK. These data further suggest that TGFβ1 mediated activation of p125FAK depends on free intracellular calcium and an intact actin cytoskeleton.
TGFβ1/αVβ6 integrin signaling is independent of the known TGFβ1 signaling pathway
TGFβ1 mediated growth inhibition is dependent on αVβ6 integrin
Influence of TGFβ1 on cell growth is well established, but the mechanisms are not fully understood [75–79]. Here, we assayed for the possible synergistic function of αVβ6 integrin on mature TGFβ1 mediated growth inhibition in Panc-1 cells. As shown in the additional file 10, combined treatment with αV and β6 blocking antibodies almost completely abolished the effect of mature TGFβ1 on the growth of Panc-1 cells. We therefore postulate that the growth inhibition of TGFβ1 is synergistically influenced by αVβ6 integrin.
A recent study demonstrated an interaction of latent TGFβ1 with αVβ6 integrin, which led to an activation of latent TGFβ1 . Incubation of different tumor cells with mature TGFβ1 resulted in a direct binding of TGFβ1 to αVβ6 integrin. Certain integrins appear to be preferentially associated with specific growth factor receptors . The interaction of these two receptor classes seems to take place via the actin cytoskeleton. We were able to exclude such signal pathway association, since in our cytoskeletal preparations, no TGFβ1-receptors were detectable, indicating that mature TGFβ1 is a ligand for αVβ6.
Binding of mature TGFβ1 to αVβ6 integrin exerts several downstream effects in TGFβ1-sensitive cells (Figure 9). One is a marked phosphorylation of p125FAK. This phosphorylation is dependent on the integrity of the cytoskeleton, as disruption of actin filaments by cytochalasin D completely eliminated this effect, findings which have also been reported for several integrin signaling pathways [66, 67]. Moreover, incubation of the TGFβ1 sensitive carcinoma cells with TGFβ1 caused immobilization of the docking protein p130cas and of the guanine nucleotide exchange factor SOS to the cytoskeleton. Beyond this, a marked induction of the cell cycle inhibitors p21WAF1 and p27KIP and a decrease in PCNA expression was detectable.
Finally, TGFβ1 caused an activation of p21Ras and the MAP kinases ERK1 and ERK2. This TGFβ1-induced expression profile was not affected by preincubation of SMAD4 deleted BxPC-3 cells with a TGFβ1-RII blocking antibody, which was able to completely block TGFβ1-induced SMAD2/3 phosphorylation, thus demonstrating the independence of the TGFβ1-signaling from the known SMAD pathway in BxPC-3 cells. In contrast, preincubation with αV- and β6-blocking antibodies curbed the TGFβ1-induced regulation of p21/WAF1, p27, c-fos, and the p21Ras and ERK1/2 activation, verifying that the binding of TGFβ1 to the αVβ6 integrin is a prerequisite for the activation of the signal pathway via the αVβ6 integrin. Preincubation of the cells with the MEK1 inhibitor PD98059 curbed the TGFβ1-induced regulation of these genes as well, indicating the involvement of the MAP kinase pathway in TGFβ1 signaling in BxPC-3 cells. As shown recently, the growth-stimulatory effect of the TGFβ superfamily member BMP-2on CAPAN-1 cells was blocked by this inhibitor as well [81–83], supporting our findings.
Indeed, cytoskeletal immobilization of p130cas and SOS was not prevented by the MEK1 inhibitor PD 98059. Thus, these proteins are good candidates to link the integrin-mediated TGFβ1 signaling to the MAP kinase pathway, as was shown previously for signaling events induced by fluid stress or integrin mediated cell-adhesion in other cell types [71, 84–91].
In order to generalize the integrin mediated TGFβ1-pathway identified in the SMAD4 deleted pancreatic tumor cell line BxPC-3, we investigated TGFβ1 signaling in the cervical carcinoma cell line HeLa and the mammary carcinoma cell lines MCF-7 and MDA-MB-231, harboring a wildtype SMAD4-gene. TGFβ1 bound to αVβ6-integrin in these cells as well, and this interaction resulted both in an immobilization of p130Cas and SOS1/2 and in tyrosine phosphorylation of cytoskeleton-associated proteins such as p125FAK. TGFβ1 stimulation of these cells acvtivated p21Ras and MAPK ERK1/2, upregulated c-fos, c-jun/AP1, p21/WAF1 and p27 expression, and resulted a decrease of PCNA, similar to its actions in BxPC-3 cells. Preincubation with a TGFβ-RII blocking antibody attenuated the TGFβ1 induced pattern, contrary to SMAD 4 deleted BxPC-3 cells. This preincubation also decreased activation of p21Ras and of MAPK ERK1/2, indicating the participation of the Ras/MAPK-pathway in TGFβ1 induced transcriptional activation.
The same attenuation of TGFβ1 induced gene expression and the decrease in p21Ras and MAPK ERK1/2 activation was observable after preincubation of SMAD4 wildtype cells with αVβ6-blocking antibodies, demonstrating that TGFβ1 signaling via αVβ6-integrin also is linked to the Ras/MAPK-pathway, and that both pathways have synergistic effects in TGFβ1-signaling. Full TGFβ1 induced transcriptional activation is only reached if both pathways are completed. This finding is supported by the observation that activation of p21/Ras and MAPK ERK1/2 induced by TGFβ1 is only reverted to the control level by the combination of the TGFβ-RII blocking antibody and the αVβ6-blocking antibodies, or by inhibition of MEK1.
Linking of the TGFβ-R pathway to the Ras/MAPK pathway is dependent on a functional SMAD4 gene product, because TGFβ1 induced gene expression and activation of Ras and ERK1/2 is attenuated by the TGFβ-RII blocking antibody only in SMAD4 wild type cells, whereas in the SMAD4 deleted BxPC-3 cells, no such influence was observable.
Based on our results, we suggest the following model of TGFβ1-signaling, which offers an explanation for the different growth responses to TGFβ1 (Fig. 10). In the TGFβ1-sensitive cell lines with intact SMAD pathway, the TGFβ1 response can be attributed to both the common SMAD signaling pathway and the integrin pathway described above. In the cell line BxPC-3, lacking the SMAD4 gene product, the SMAD4-independent pathway can explain the TGFβ1 sensitivity via αVβ6 integrin, the cytoskeleton and the Ras/MAP kinase pathway, resulting in an upregulation of the cell cycle inhibitiors p21/WAF1 and p27, which in turn results in the TGFβ1-induced growth inhibition (additional file 10).
The cell lines Capan-1 and AsPC-1 are not only resistant to TGFβ1 because of their alterations in the SMAD pathway, but also because they cannot complete the alternate pathway, as demonstrated above. Furthermore, this alternate pathway may explain the TGFβ1 resistance of cells with no detectable defect in the SMAD pathway [92–101], as one can imagine that the cooperative action of the both pathways is necessary to exert the complete growth inhibitory effect of TGFβ1. Comparable effects have been described for the synergistic operation of growth factor receptor and anchorage dependent integrin signaling [102–119].
Recombinant mature TGFβ1 does not contain a RGD motif, and thus binding of TGFβ1 to the αVβ6 integrin and the subsequent activation of this integrin must rely on a novel motif distinct from RGD. For αVβ6 integrin, a novel non-RGD ligand recognition motif was recently described with the consensus motif DLXXL .
This motif has been detected on several proteins, including laminin, collagen and fibrinogen . A BLAST search for this sequence in TGFβ1 revealed a 70% similar motif in two parts of the molecule; one in the LAP (data not shown) and one in the mature TGFβ1. In mature TGFβ1, the DLXXL motif is freely accessible for interactions on the outside of the molecule. Therefore, it may be speculated that TGFβ1 binding to αVβ6 via this novel ligand recognition motif is facilitating the signaling. Moreover, a non-RGD ligand binding pocket in addition to the usual RGD binding site has been demonstrated for fibrinogen and the αIIbβ3 integrin , supporting our findings.
We demonstrate an alternate TGFβ1 signaling pathway via αVβ6 integrin, independent of SMAD4. This pathway seems to be required for full TGFβ1 induced transcriptional activation, which explains the TGFβ1 sensitivity of those cells lacking DPC4/SMAD4 function that still react with growth inhibition.
Cell Culture and TGFβ1 stimulation
All cells were obtained from from ATCC and maintained in DMEM supplemented with 17% fetal calf serum. Recombinant human proteins (mature TGFβ1, TNF-α, Fibronectin and Laminin 1) were purchased from R&D Systems. 106 cells were grown overnight in 6 cm diameter dishes with DMEM/10 % FCS. After washing twice with PBS (pH 7.4), fresh DMEM without FCS was added to the monolayer. Cells were stimulated with 10 nM of mature TGFβ1 or with fibronectin as described below. In blocking experiments, cells were preincubated with either a TGFβ1-RII-blocking antibody (R&D Systems # AF-241-NA, 15 μg/ml for 30 min), αV and β6-blocking antibodies (Santa Cruz, sc-6617 and sc-6632 respectively, 1:100 each for 30 min), or the MEK1 inhibitor PD98059 (New England Biolabs # 9900S, 7.5 ng/ml for 10 min) before stimulation with mature TGFβ1.
For indirect immunofluorescence, 104 cells were cultured on glass coverslips, stimulated with 10 nM mature TGFβ1 for 10 minutes, stained as described [66, 67] and viewed using a Zeiss LSM-510 confocal microscope. Antibodies used were: actin (sc-8432), TGFβ1 (sc-146), αV (sc-6617) and β6 (sc-6632). The following fluorochrome-labeled antibodies were used (AlexaFluor, Molecular Probes): goat anti-mouse IgG (H+L) conjugate (#A-11032; red), goat anti-rabbit IgG (H+L) conjugate (#A-11046; blue), and donkey anti-goat IgG (H+L) conjugate (#A-11055; green).
Preparation of cytoplasmatic proteins and of nuclei
Cellular fractionation was performed as described in earlier reports [122–125]. Cells were scraped into 100 μl of ice-cold buffer A [10 mM Hepes (pH 7.9); 1.5 mM MgCl2; 10 mM KCl; 0.5 mM DTT; 0.05% NP-40]. Nuclei were pelleted in a microcentrifuge for 10 sec. at 4°C and 15,000 G. The supernatant was used to analyze cytoplasmatic proteins, nuclei were resuspended in 60 μl of ice cold buffer B [20 mM Hepes (pH 7.9); 25% (v/v) glycerol; 420 mM KCl; 1.5 mM MgCl2; 0.2 mM EDTA; 0.5 mM DTT; 0.5 mM PMSF] and incubated on ice for 15 min.
Preparation of actin filaments of the cytoskeleton and immunoprecipitation
The cell monolayer was incubated with cell extraction buffer [0.1 % Triton X-100, 80 mM KCl, 20 mM imidazole, 2 mM MgCl2, 2 mM EGTA, pH 7.8] for 5 min at 4°C. The Triton-insoluble fractions were then scraped into cold Triton X-100 lysis buffer [50 mM Tris/HCl (pH 7.4); 100 mM NaCl; 50 mM NaF; 5 mM EDTA; 40 mM glycerophosphate; 1 mM sodium orthovanadate; 100 μM PMSF; 1 μM leupeptin; 1 μM pepstatin A; 1% (v/v) Triton X-100] and incubated for 20 min on ice, and clarified by centrifugation at 13000 g for 5 min at 4°C. For immunoprecipitation, the lysates were incubated for 4 h at 4°C with 1 μg of antibody (all from Santa Cruz) pre-adsorbed on Protein A-Sepharose beads (Pharmacia). Immune complexes were washed five times with cold Triton X-100 lysis buffer. For re-precipitation, the pellet was boiled in 10 μl 0.1% SDS for 5 min and diluted 1:20 in the Triton X lysis buffer followed by the precipitation procedure. All samples were boiled in Laemmli denaturing buffer and analyzed by Western blotting. Whole cell lysates serving as positive controls were prepared by incubating monolayers with denaturing Laemmli buffer.
Treatment with Cytochalasin and Calcium Chelator
To disrupt the actin filaments of the cytoskeleton, the cell monolayer was treated with 25 nM cytochalasin D for 20 min at 37°C; TGFβ1 was then applied in the presence of 25 nM cytochalasin D. For chelating intracellular calcium, the cells were preincubated with 5 μM of 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid, acetoxymethyl ester (BAPTA-AM) for 15 min. TGFβ1 was then applied in the presence of 5 μM of BAPTA.
[3H]-thymidine incorporation assay
For the TGFβeta1 growth inhibition assay, cells were seeded in 96-well microtitier plates at 104 cells/well in 100 μl of culture medium containing 10% FCS. After 24 h, medium was replaced by culture medium supplemented with 0.5% FCS. After an additional 24 h, cells were treated with 10 nM of mature TGFβ1. After incubation with TGFβ1 for 21 h, cells were pulsed with 200 nCi of [3H]-thymidine (1.74 TBq/mmol; Amersham, UK) for 3 h without changing the medium. Cells were washed once with PBS, incubated with trypsin for 10 min and collected by using a Skatron cell harvester. Radioactivity incorporated was determined by liquid scintillation counting.
Proteins were separated by SDS-PAGE and transferred to a polyvinylidene difluoride membrane (Roche) as described previously . Blot membranes were blocked for 3 h at 37°C in PBS containing 5 % skim milk and probed with the respective antibodies (16 h at 4°C). The following antibodies were used in a dilution of 1:1,000: TGFβ1 (Santa Cruz [sc], sc-146), p-Tyr (sc-7020), β6-integrin (sc-6632), αV-integrin (sc-6617), p125FAK (sc-557), TGFβ1-RI (sc-402), TGFβ1-RII (sc-400-G), ERK1/2-P (sc-7383), SMAD2/3 (sc-6033), SOS1/2 (sc-259), p130cas (UBI-06-500), PCNA (sc-56), p21WAF1 (sc-6246), p27KIP (sc-1641), c-fos (sc-7202), c-jun (sc-44), raf1 (sc-133), p21Ras (sc-35) and phospho-threonine antibody (New England Biolabs, # 9381). Detection antibodies (all from Dako; 1:5,000 for 1 h at room temperature) were mouse-anti-goat Ig, mouse-anti-rat Ig, rabbit-anti-mouse Ig, and porcine-anti-rabbit Ig-HRP . To visualize all transferred proteins, we used the ECL protein biotinylation labeling modules (RPN 2202, Amersham) and streptavidin alkaline phosphatase (V020402, Amersham) in accordance with the manufacturer's instructions.
Ras activation assay
Only activated p21Ras is able to bind Raf1, leading to a Raf1-translocation to the cell membrane. After stimulation with 10 nM mature TGFβ1 for 10 minutes, cells were incubated in sterile water until they lysed. The membrane fraction was lysed in Triton X-100 lysis buffer. Precipitation against Raf1 and analysis for p21Ras followed.
CS acknowledges support from the German Research Foundation. GMS is a recipient of a Fellowship of the Cancer League of Bern, Switzerland.
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