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conversion of inactive RAC to active RAC in the presence or absence of said compound, and (iv) selecting the compound inhibiting the conversion of inactive RAC to active RAC.\n","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"}]},"abstract_lang":["en"],"has_abstract":true,"claim":{"en":[{"text":"A method for identifying a compound which inhibits the activation of RAC GTPase activity by DOCK5 protein comprising the steps of:\n - coexpressing the DOCK5 and the RAC proteins in a cell, wherein said DOCK5 protein induces the conversion of inactive RAC, which inactive RAC is bound to GDP, to active RAC, which active RAC is bound to GTP. \n - contacting or not said cell with said compound, \n - determining the conversion of inactive RAC to active RAC in the presence or absence of said compound, and \n - selecting the compound inhibiting the conversion of inactive RAC to active RAC.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of claim 1, wherein the selected compound should be useful for treating disease associated with bone loss.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of claim 2, wherein said disease associated with bone loss is selected in the group comprising menopause, osteoporosis, osteopenia due to bone metastases, periarticular erosions in rheumatoid arthritis, primary hyperparathyroidism, hypercalcemia of malignancy, Paget's disease of bone, periodontal disease, immobilization induced osteopenia, and glucocorticoid treatment.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of any one of claims 1 to 3, wherein said method further comprises the step of testing the inhibition of bone resorption by the selected compound.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of any one of claims 1 to 4, wherein said DOCK5 protein refers to a polypeptide comprising the DHR2 domain of the protein DOCK5 corresponding to the amino acid 1132 to 1661 of the DOCK5 protein from Mus musculus SEQ ID NO:1 and derivatives thereof.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of any one of claims 1 to 5, wherein said DOCK5 protein corresponds to SEQ ID NO:4 corresponding to Homo sapiens DOCK5 protein.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of any one of claims 1 to 6, wherein the RAC protein corresponds to SEQ ID NO:2 and derivatives thereof.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of any one of claims 1 to 7, wherein said method further comprises the expression of the PAK1 protein in said cell, wherein said PAK1 protein interacts with the RAC protein.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of claim 8, wherein the PAK1 protein corresponds to the SEQ ID NO:3 and derivatives thereof.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of any one of claims 8 or 9, wherein said cell further comprises a reporter gene under the control of a promoter sequence, and said RAC and PAK1proteins are each fused either with a transactivation domain or with a DNA binding domain specific of said promoter sequence, wherein the interaction of RAC with PAK1 results in the induction of expression of the reporter gene.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"}]},"claim_lang":["en"],"has_claim":true,"description":{"en":{"text":"Field of the invention The invention relates to the field of diseases associated with bone loss, and more specifically to a new method for identifying compounds useful for treating and/or preventing diseases associated with bone loss. Background of the Invention Bone is a dynamic tissue that is continually remodeled throughout life depending on factors such as nutrition and the load the bone must carry. Normal bone formation depends on the delicate balance between new bone addition and old bone resorption. Bone formation is based on the deposition of bone matrix by osteoblasts and bone resorption and more specifically mineralized tissue, chiefly calcium carbonate and calcium phosphate resorption in vertebrates is achieved by osteoclasts. Typically, in a normal adult, about 5-10% of bone is replaced by these processes annually. These osteoclasts are multinucleated cells of up to 400µm related to macrophage and other cells that develop from monocyte cells, which are actively motile cells that migrate along the surface of bone. Like macrophage, osteoclasts are derived from haematopoietic progenitor cells. The bone resorption is initiated when an osteoclast attaches to the surface of mineralized bone, forms a tight \"sealing zone\" and secretes necessary acids and proteases that initiate the resorption of mineralized tissue from the bone. After a period of several hours to days, the osteoclast detaches from the bone, leaving a pit on the bone surface. Under normal conditions, the pit is a target for osteoblasts, which deposit a material that ultimately becomes new bone. Bone loss can result when the bone resorptive process is dominant over the bone formative process. Diseases associated with bone loss are usually accompanied by increased osteoclast activation. Such diseases include estrogen deficiency after the menopause, osteoporosis, osteopenia due to bone metastases, periarticular erosions in rheumatoid arthritis, primary hyperparathyroidism, hypercalcemia of malignancy, Paget's disease of bone, periodontal disease, immobilization induced osteopenia, and glucocorticoid treatment. As an example, there are currently 20 million people with detectable fractures of the vertebrae due to osteoporosis in the United States. In addition, there are 250,000 hip fractures per year attributed to osteoporosis. This clinical situation is associated with a 12% mortality rate within the first two years, while 30% of the patients require nursing home care after the fracture. Since diseases of bone loss are associated with increased activity of osteoclast, it is important to understand the mechanisms by which osteoclasts are activated in these disease states, and to devise rational and therapeutic means to inhibit or reduce this activation. Description of the invention The inventors have presently identify the DOCK5 protein is implicated in sealing zone formation and consequently in bone resorption. Thus, DOCK5 corresponds to a new therapeutic target for treating and/or preventing bone loss diseases. Finally, the inventors have used yeast exchange assay (YEA) for identifying inhibitors of DOCK5, which inhibitors can be useful for treating and/or preventing bone loss diseases. Thus, in a first object, the present invention is directed to a method for identifying a compound which inhibits the activation of RAC GTPase activity by DOCK5 protein comprising the steps of:\n coexpressing the DOCK5 and the RAC proteins in a cell, wherein said DOCK5 protein induces the conversion of inactive RAC, which inactive RAC is bound to GDP, to active RAC, which active RAC is bound to GTP. contacting or not said cell with said compound, determining the conversion of inactive RAC to active RAC in the presence or absence of said compound, and selecting the compound inhibiting the conversion of inactive RAC to active RAC. The selected compound should be useful for treating disease associated with bone loss. In fact, the inventors have established that the conversion of inactive RAC to active RAC by DOCK5 is associated with the sealing zone formation. As an example of disease associated with bone loss, one can cites menopause, osteoporosis, osteopenia due to bone metastases, periarticular erosions in rheumatoid arthritis, primary hyperparathyroidism, hypercalcemia of malignancy, Paget's disease of bone, periodontal disease, immobilization induced osteopenia, or in glucocorticoid treatment. Results from the cellular and bone resorption assay systems used herein are widely accepted in the art as predictive of in vivo effects. As the bone resorption assay uses material that includes all bone cells, it is an ex vivo assay. Thus, the showing that the inhibition of RAC activation by DOCK5 inhibits bone resorption in these assays is evidence of the clinical utility of inhibitors of this specific activation for treating osteoporosis. Various scientific publications, such as Carano et al. (1990); Blair & Schlesinger (1992); Schlesinger & Blair (1992); Vaananen et al., 1990; all support the fact that such assays are accepted as being predictive of in vivo activity. Methods for determining the conversion of inactive RAC to active RAC are well known from the skilled person. As an example of such methods, one can cites the methods disclosed in the examples and in COTE & VUORI (J. Cell. Sci., viol.115, p: 4901-4913, 2002 ). In a preferred embodiment, the method of the invention further comprises the step of testing the inhibition of bone resorption by the selected compound. Said inhibition of bone resorption can be simply tested by method well known from the skilled person, such as the one disclosed in the example, wherein mineralised matrix resorption by osteoclasts is tested by culturing said osteoclasts are cultured on calcium phosphate substrates and mineralised matrix resorption is determined by VON KOSSA staining. As used herein, the term \"compound\" refers to a natural or synthetic compound, such as chemical or peptidic compound. As used herein, the expression DOCK5 protein refers to a polypeptide comprising the DHR2 domain of the protein DOCK5 corresponding to the amino acid 1132 to 1661 of the DOCK5 protein from Mus musculus SEQ ID NO:1 and derivatives thereof. Preferably, said DOCK5 protein corresponds to SEQ TOD NO:1. Again preferably, said DOCK5 protein corresponds to SEQ ID NO:4 corresponding to Homo sapiens DOCK5 protein. As used herein, the expression \"RAC protein\" refers to SEQ ID NO:2 and derivatives thereof. According to a preferred embodiment, said cell is an eukaryotic cell, preferably a yeast cell. Advantageously, said method further comprises the expression of the PAK protein in said cell, wherein said PAK1 protein interacts with the RAC protein. As used herein, the expression \"PAK1 protein\" refers to the SEQ ID NO:3 and derivatives thereof. As used herein, the term \"derivatives\"' refer to a polypeptide having a percentage of identity of at least 80% with amino acid 1132 to 1661 of SEQ ID NO: 1, SEQ ID NO: 2, EQ ID NO:3 or SEQ ID NO:4, or orthologs thereof, preferably of at least 90%, as an example of at least 95%, and more preferably of at least 99%. As used herein, \"percentage of identity\" between two amino acids sequences, means the percentage of identical amino-acids, between the two sequences to be compared, obtained with the best alignment of said sequences, this percentage being purely statistical and the differences between these two sequences being randomly spread over the amino acids sequences. As used herein, \"best alignment\" or \"optimal alignment\", means the alignment for which the determined percentage of identity (see below) is the highest. Sequences comparison between two amino acids sequences are usually realized by comparing these sequences that have been previously align according to the best alignment; this comparison is realized on segments of comparison in order to identify and compared the local regions of similarity. The best sequences alignment to perform comparison can be realized, beside by a manual way, by using the global homology algorithm developed by SMITH and WATERMAN (Ad. App. Math., vol.2, p:482, 1981 ), by using the local homology algorithm developed by NEDDLEMAN and WUNSCH (J. Mol. Biol., vol.48, p:443, 1970 ), by using the method of similarities developed by PEARSON and LIPMAN (Proc. Natl. Acd. Sci. USA, vol.85, p:2444, 1988 ), by using computer softwares using such algorithms (GAP, BESTFIT, BLAST P, BLAST N, PASTA, TFASTA in the Wisconsin Genetics software Package, Genetics Computer Group, 575 Science Dr., Madison, WI USA), by using the MUSCLE multiple alignment algorithms ( Edgar, Robert C., Nucleic Acids Research, vol. 32, p:1792, 2004 ). To get the best local alignment, one can preferably used BLAST software, with the BLOSUM 62 matrix, or the PAM 30 matrix. The identity percentage between two sequences of amino acids is determined by comparing these two sequences optimally aligned, the amino acids sequences being able to comprise additions or deletions in respect to the reference sequence in order to get the optimal alignment between these two sequences. The percentage of identity is calculated by determining the number of identical position between these two sequences, and dividing this number by the total number of compared positions, and by multiplying the result obtained by 100 to get the percentage of identity between these two sequences. Advantageously, said cell further comprises a reporter gene under the control of a promoter sequence, and said RAC and PAK1proteins are each fused either with a transactivation domain or with a DNA binding domain specific of said promoter sequence, wherein the interaction of RAC with PAK1 results in the induction of expression of the reporter gene. The method corresponds to the Yeast Exchange Assay (YEA) as disclosed in DE TOLEDO et al. (FEBS, vol.480, p:287-292, 200 ) and International Patent application PCT WO 2005/064007 using the DOCK5 and the RAC protein. Thus, the disclosure of YEA in Patent application PCT WO 2005/064007 (page 6, \"decription de l'invention\" paragraph, to page 23) are incorporated herein by reference. The term \"reporter gene\" is well known from the skilled person and can corresponds to an auxotrophic marker or to a gene coding for a protein which can be simply detected such as GFP, luciferase or β-Gal. In this embodiment, the determination of the conversion of inactive RAC to active RAC is done by determining the expression of the reporter gene. The inhibition of the expression of the reporter gene corresponding to an inhibition of the conversion of inactive RAC to active RAC. In the following, the invention is described in more detail with reference to amino acid sequences, nucleic acid sequences and the examples. Yet, no limitation of the invention is intended by the details of the examples. Rather, the invention pertains to any embodiment which comprises details which are not explicitly mentioned in the examples herein, but which the skilled person finds without undue effort. EXAMPLES 1) Dock 5 mRNA expression The expression of Dock5 was established in different mouse tissue. For this, DNasel-treated total RNA was extracted using the High pure RNA isolation kit (ROCHE DIAGNOSTICS). To generate cDNA, RNA was primed with 10-mer random primers and reverse transcription catalysed using SUPERSCRIPT II reverse transcriptase (INVITROGEN). Quantitative PCR was performed with a Light Cycler (ROCHE DIAGNOSTICS) or a Mx3000p PCR system (STRATAGENE) using the PLATINIUM Taq DNA polymerase (INVITROGEN) and SYBR GREEN I (BIOWITAKKER) as in described in COELHO et al. (Proc. Natl. Acad. Sci. U.S.A., vol.102, p:11917-11922, 2005 ) with the primers Dock5-Up (TGGTGACACAGGGACAGTGG, SEQ ID NO:5) and Dock5-Do (CACCCCAACTAGCACGTGG, SEQ ID NO: 6) for Dock5, and Gapdh-Up (ACAGTCCATGCCATCACTGCC, SEQ ID NO: 7) and Gapdh-Do (GCCTGCTTCACCACCTTCTT, SEQ ID NO: 8) for Gapdh as a control. The specificity was assessed by purification and sequencing of the PCR product. All real-time PCR measures to quantify cDNA were done in triplicate, and the 95% confidence limits of the ratios to Gapdh were determined by Student's t-test. The figure 1 shows the expression of Dock5 in different mouse tissues, where said expression has been normalised according to Dock5 osteoclasts' expression (i.e., Dock5 osteoclasts' expression corresponding to 100% level). The analysed tissues are as follow: Muscle 1 (M1), Muscle 2 (M2), heart (H), mammary gland at 10.5 days of embryo's development (GM 10.5), mammary gland at 13.5 days of embryo's development (GM 13.5), mammary gland at 15.5 days of embryo's development (GM 15.5), mammary gland at 18.5 days of embryo's development (GM 18.5), mammary gland of juvenile mouse (GM j), mammary gland at lactation (GM 1), brain (Br), kidney (Kd), uterus (Ut), liver (Lv), macrophage (Mac), Testis 1 (T1), Testis 2 (T2), spleen (Sp), colon (Co), bone marrow (Bm), placenta at 13.5 days of embryo's development (P1 13.5), placenta at 15.5 days of embryo's development (GM 15.5), and osteoclasts (Os). The results show that Dock5 is predominantly expressed in osteoclats, but an important expression of Dock5 is also found in placenta (i.e., nearly 50%). The expression of Dock5 is reduced in bone marrow, colon, spleen and testis compared to osteoclasts (i.e., nearly 20%), whereas its expression in the other tested tissues is fewer (i.e., nearly 10%). Thus, the results established that the expression of Dock5 is very specific from the osteoclats. 2) obtaining of DOCK5 polyclonal antibody A rabbit polyclonal antibody was raised to a mouse DOCK5 C-terminus peptide corresponding to amino acids 1658-1869 from mouse DOCK5 and purified by immunoaffinity. In fact, the amino acids sequences significantly differ between the differents members of the subgroup DOCK-A. Osteoclastogenesis was induced by RANKL-stimulation in purified mouse bone marrow macrophages were purified and in RAW264.7 cell line as described in BRAZIER et al. (abovementioned, 2006), which cells were maintained in culture. At 0, 3 or 5 days of stimulation, the cells were subjected to SDS-PAGE and blotted on polyvinyl difluoride membrane (MILLIPORE IMMOBILON-P pore size 0.45 µm). After transfer, the membrane was incubated in TBS-T (Tris buffered saline containing 0.1% TWEEN) with 2% skim millk at room temperature for 30 min and then with rabbit antisera diluted 1:1000 in TBS-T overnight at 4°C. The bound antibodies were detected by peroxidase labelled anti-rabbit immunoglobulin chemoluminescence system (AMERSHAM) and LAS-1000 image analyser (FUJI FILM). As a control, the membrane was further incubated with GAPDH antibodies, the bound antibodies being detected as previously. The Figure 2 A shows the expression of DOCK5 and GAPDH proteins in purified mouse bone marrow macrophages at 0, 3 and 5 days from the RANKL-stimulated osteoclastogenesis. The results established that a protein of 215 kDa was induced during RANKL-stimulated osteoclastogenesis of purified mouse bone marrow macrophages ( figure 2 ) and of RAW264.7 cell line (data not shown). This size is compatible with the size of the DOCK5 protein deduced from its mRNA. 3) DOCK5 polyclonal antibody specificity ShRNA target sequences were selected in mouse Dock5 open reading frames, and the 65-mer sense and antisense strands of DNA oligonucleotides were designed according to the CLONTECH BIOINFORMATICS DATA server and are described in BRAZIER et al. (abovementioned, 2006). The oligonucleotide was then synthetised by INVITROGEN annealed and cloned in pSINREN-RETROQ vector containing a puromycin resistance selection marker according to the manufacturer's instructions (CLONTECH). The pSIREN-RETROQ-Luc vector (CLONTECH) targeting firefly luciferase was used as a control. Retrovirus packaging was done by co-transfection of pSIREN-RETROQ vectors, the Friend MLV-based Gag-Pol expression vector pC57GP ( LASSAUX et al., J. Virol., vol.79, p:6560-6564, 2005 ), and the VSV-G envelope glycoprotein expression vector pCSIG ( BATTINI et al., Proc. Natl. Acad. Sci., vol.96, p:1385-1390, 1999 ) into 293T cells using Jet PI (QBIOGEN) according to manufacturer's instructions. Viral supernatants were harvested 3 days after transfection and filtered through a 0.45 µm pore size filter. For infections, RAW264.7 cells were plated at 2.10 5 cells per 6-cm dish. The next day, the medium was replaced for 4h with 1.5 ml of viral supernatant and 0.5 ml of growth medium containing 8µg/ml polybrene. Cells were lefet to recover in growth medium for 24 h, and infected cells were slected by addition of puromycin (3 µg/ml) for another 24h. Infected RAW264.7 were scrapped and reseeded in growth medium at 5.10 4 cells/well of a 6-well plate for RANKL-stimulated osteoclastogenesis as described in BRAZIER et al. (abovementioned, 2006). Then, the detection of the DOCK5 protein was realized with the rabbit polyclonal anti-DOCK5 as described previously. The Figure 2A shows the expression of DOCK5 and GAPDH proteins in RAW264.7 cell lines infected with retrovirus coding for either small hairpin RNA directed against firefly luciferase (shLuc) or dock5 (shDock5) at 0, 3 and 5 days from the RANKL-stimulated osteoclastogenesis. As described previously, the results established that a protein of 215 kDa was induced during RANKL-stimulated osteoclastogenesis of RAW264.7 cell line infected with a retrovirus coding for a small hairpin RNA directed against firefly luciferase. For RAW264.7 cell line infected with a retrovirus coding for a small hairpin RNA directed against Dock5, no protein of 215 kDa was detected during RANKL-stimulated osteoclastogenesis. Finally, the results confirmed that the protein DOCK5, such as its corresponding RNA, is induced during osteoclastogenesis, and that the obtained rabbit polyclonal anti-DOCK5 antibody is specific of the DOCK5 protein. 4) Dock5 mediates Rac activation in vivo We therefore examined whether the DOCK5 protein, and more specifically its DHR2 domain, could activate with nucleotide-free form of small GTPases of the Rho-family-i.e., Racl and cdc42-. To this end a GFP protein fused to the DHR2 domain of DOCK5 (see Figure 3A ) was generated. In vivo GTP loading of Rac and cdc42 was analysed as previously described in COTE & VUORI (J. Cell. Sci., vol.115, p: 4901-4913, 2002 ). Briefly, 293-T cells were transfected in six-wells plates with a vector coding for the GFP fusion protein comprising the DHR2 domain of DOCK5 (DHR2) or with a vector coding for GFP (GFP). 48 hours after transfection, cells were lysed in MLB buffer (25mM HEPES, pH 7.5, 150 mM NaCl, 1% NP-40, 10 mM MgCl2, 1 mM EDTA and 10% glycerol). The clarified lysates were incubated for 30 minutes with the GST-PAK-PBD fusion protein bound to Glutathione sepharose. The beads were washed extensively with MLB buffer and the bound GTP-loaded Rac and cdc-42 were detected by immunoblotting. Equal amount of input lysate were analysed by immunoblotting to verify the expression levels of Rac, cdc42, GFP-DHR2 and GFP proteins. GST-PAK-PBD was expressed and purified for these experiments as described previously in ABASSI & VUORI (EMBO J., vol.21, p:4571-4582, 2002 ). The figure 3B shows the expression levels of Rac, cdc42, GFP-DHR2 and GFP proteins in total cell lysates (total) and the protein detected after GTP-trapping. The results show that the expression of the DHR2 domain in 293-T cells induces the activation of endogeneous Rac but has no effect on cdc42 ( figure 3B ). Finally, the results established that the DHR2 domain of DOCK5 is able to activate the Rac GTPase, whereas it has no effect on cdc42. 5) ELMO1 binds to the SH3 domain of DOCK5 293-T cells were cotransfected as described previously with a vector coding for the ELMO1 protein ( GUMIENNY et al., Cell, viol.107, p:27-41, 2001 ) and a vector coding GFP fusion proteins comprising the Full length DOCK5 protein (FL), the DOCK5 protein sequence deleted from (i) the amino acids 1 to 559 of its N-terminus extremity (ΔNter), including the SH3 domain and half of the DHR1 domain, or the DOCK5 protein sequence deleted from (ii) the amino acids 1 to 82 comprising the SH3 domain (ΔSH3). 48 hours after transfection, cells were lysed in MLB buffer (25mM HEPES, pH 7.5, 150 mM NaCl, 1% NP-40, 10 mM MgCl2, 1 mM EDTA and 10% glycerol). The clarified lysates were immunoprecipitated with anti-GFP antibody and the bound ELMO1 protein was detected by immunoblotting. Equal amount of input lysate were analysed by immunoblotting to verify the expression levels of ELMO1 protein. The figure 3C shows the expression levels of ELMO1 protein in total cell lysates (total) and after immunopreciptation with anti-GFOP antibody (IP GFP), in cells cotransfeted with a vector coding for ELMO1 protein and full length DOCK5 (FL), DOCK deleted from its SH3 domain (ΔSH3) or from its N-term domain (ΔNter). The results established that the N-term domain of DOCK5, and more specifically its SH3 domain, is necessary for the binding of ELMO1 to DOCK5 ( Figure 3C ). 6) The SH3 domain of DOCK5 inhibits Rac activation in vivo In vivo GTP loading of Rac was determined as previously in the presence of different domains of the DOCK5 protein and, eventually, the simultaneous presence of the ELMO1 protein. The figure 3D shows the expression levels of Rac in total cell lysates (total) and the RAC-GTP protein detected after GTP trapping in the cells transfected with a vector coding for the GFP protein (GFP), for the DHR2 domain of DOCK5 (DHR2), for the DOCK5 protein deleted from its SH3 domain (ΔSH3), for the DOCK protein (FL), eventually cotransfected with a vector coding for the ELMO1 protein (FL+Elmo). The results show as previously that the expression of the DHR2 domain is able to activate the Rac GTPase and that the SH3 domain inhibits this activation ( Figure 3D ). In fact, the deletion of the SH3 domain results in the activation of the Rac GTPase by the deleted DOCK5 protein. Finally, the binding of ELMO1 to the SH3 domain results in the activation of the Rac GTPase. 7) DOCK5 is a major activator of Rac in osteoclats. RAW264.7 cell lines stimulated with RANKL were infected as described previously with a retrovirus coding for either small hairpin RNA directed against firefly luciferase (shLuc) or dock5 (shDock5). In these infected cells, in vivo GTP loading of Rac was determined as disclosed previously. The figure 4 shows the expression levels of Rac in total cell lysates (total Rac) and the RAC-GTP protein detected after GTP trapping in the cells infected with a retrovirus coding for either small hairpin RNA directed against firefly luciferase (shLuc) or dock5 (shDock5). The results established that the inhibition of DOCK5 expression results in a decrease of Rac GTPase activity (i.e., 40%). Thus, DOCK5 is an essential exchange factor of RAC in osteoclasts. 8) DOCK5 is necessary for mineralised matrix resorption RAW264.7 cell lines were infected as described previously with a retrovirus coding for either small hairpin RNA directed against firefly luciferase (shLuc) or dock5 (shDock5), and then osteoclastogenesis was stimulated with RANKL. The obtained cells were then cultured on calcium phosphate substrates. Finally, the polymerisation of actin was tested by fluorescence in the infected cells with phalloïdine. The figure 6 shows the polymerisation of actin in RAW264.7 cell lines stimulated with RANKL which have been infected with a retrovirus coding for either small hairpin RNA directed against firefly luciferase (shLuc) or dock5 (shDock5) and the mineralised matrix resorption in the presence of said osteoclasts. The results show that in the osteoclasts, the DOCK5 protein is associated with the podosome and with the sealing zone (data not shown). The osteoclasts wherein DOCK5 expression was inhibited show a default of contraction and of sealing zone formation. The measure of mineralised matrix resorption surface by VON KOSSA staining shows a strong decrease of the resorption by osteoclasts wherein DOCK5 expression was decreased. Finally, these results established that DOCK5 is a new therapeutic target for limiting bone loss in menopause, osteoporosis, osteopenia due to bone metastases, periarticular erosions in rheumatoid arthritis, primary hyperparathyroidism, hypercalcemia of malignancy, Paget's disease of bone, periodontal disease, immobilization induced osteopenia, or in glucocorticoid treatment. Because of the specific osteoclasts DOCK5 expression, the targeting of DOCK5 may limit side effects such as the ones observed with drugs for treating bone loss. 9) Identification of DOCK5 inhibitor In order to identify DOCK5 inhibitors, which inhibitors can be useful for treating bone loss associated disease, we use the Yeast Exchange Assay (YEA) as disclosed in DE TOLEDO et al. (FEBS, vol.480, p:287-292, 200 ) and International Patent application PCT WO 2005/064007 . Briefly, we transform a yeast strain TAT7 (Mata, trp1, his3, leu2, ura3, ade2, LYS:: (LexAop)4-HIS3, URA3:: (LexAop)8-lacZ) provided by J. CAMONIS) with vectors expressing the DHR2 domain of DOCK5 fused to a myc-tag (SEQ ID NO: ...), the wild type Rac GTPase fused to LexA and its effector PAK fused to the transactivation domain of GAL4. In the obtained transformed yeast, the expression of the DHR2 domain of DOCK5 induces the activation of Rac, which activated Rac interacts with its effector PAK resulting in the expression of reporter genes β-Gal and His3 (see Figure 6 ). In order to modify yeast cell membrane permeability, a mutation in the Erg6 gene has been introduced as disclosed in BLANGY et al. (Biol. Cell., vol.98(9), p:511-22, 2006 ). This mutation of the Erg6 gene increases the entry of the screened compounds in the yeast cells, and thus enables to limit the concentration of the screened compounds. For screening DOCK5 inhibitors, which can be useful for treating bone loss diseases, the transformed yeast is contacted with several chemical or peptidic molecules, and the chemical or peptidic molecules inhibiting the expression of reporter genes β-Gal and His3 are selected for further testing in the bone loss model disclosed in 8 and then in bone loss diseases models.\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"}},"description_lang":["en"],"has_description":true,"has_docdb":true,"has_inpadoc":true,"has_full_text":true,"biblio_lang":"en"},"jurisdiction":"EP","collections":[],"usersTags":[],"lensId":"039-253-451-853-215","publicationKey":"EP_2157433_A1","displayKey":"EP 2157433 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PATENT OFFICE","inventorModel":{"inventors":[{"name":{"value":"BLANGY ANNE","valueNormalised":"Blangy Anne"},"inventorship":null}],"inventorships":[],"unmatchedInventorships":[],"activeUserHasInventorship":false},"simpleFamilyId":190519270,"citesPatentCount":1,"countrySpec":{"countryName":"EUROPEAN PATENT OFFICE","description":"APPLICATION PUBLISHED WITH Search Report","rule":"","docType":"PATENT_APPLICATION"},"pageTitle":"EP 2157433 A1 - New method for identifying compounds useful for treating and/or preventing diseases associated with bone loss","documentTitle":"New method for identifying compounds useful for treating and/or preventing diseases associated with bone loss"},"claims":{"source":"xml_claims","claims":[{"lines":["A method for identifying a compound which inhibits the activation of RAC GTPase activity by DOCK5 protein comprising the steps of:
- coexpressing the DOCK5 and the RAC proteins in a cell, wherein said DOCK5 protein induces the conversion of inactive RAC, which inactive RAC is bound to GDP, to active RAC, which active RAC is bound to GTP.
- contacting or not said cell with said compound,
- determining the conversion of inactive RAC to active RAC in the presence or absence of said compound, and
- selecting the compound inhibiting the conversion of inactive RAC to active RAC."],"number":1,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 1, wherein the selected compound should be useful for treating disease associated with bone loss."],"number":2,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 2, wherein said disease associated with bone loss is selected in the group comprising menopause, osteoporosis, osteopenia due to bone metastases, periarticular erosions in rheumatoid arthritis, primary hyperparathyroidism, hypercalcemia of malignancy, Paget's disease of bone, periodontal disease, immobilization induced osteopenia, and glucocorticoid treatment."],"number":3,"annotation":false,"title":false,"claim":true},{"lines":["The method of any one of claims 1 to 3, wherein said method further comprises the step of testing the inhibition of bone resorption by the selected compound."],"number":4,"annotation":false,"title":false,"claim":true},{"lines":["The method of any one of claims 1 to 4, wherein said DOCK5 protein refers to a polypeptide comprising the DHR2 domain of the protein DOCK5 corresponding to the amino acid 1132 to 1661 of the DOCK5 protein from Mus musculus SEQ ID NO:1 and derivatives thereof."],"number":5,"annotation":false,"title":false,"claim":true},{"lines":["The method of any one of claims 1 to 5, wherein said DOCK5 protein corresponds to SEQ ID NO:4 corresponding to Homo sapiens DOCK5 protein."],"number":6,"annotation":false,"title":false,"claim":true},{"lines":["The method of any one of claims 1 to 6, wherein the RAC protein corresponds to SEQ ID NO:2 and derivatives thereof."],"number":7,"annotation":false,"title":false,"claim":true},{"lines":["The method of any one of claims 1 to 7, wherein said method further comprises the expression of the PAK1 protein in said cell, wherein said PAK1 protein interacts with the RAC protein."],"number":8,"annotation":false,"title":false,"claim":true},{"lines":["The method of claim 8, wherein the PAK1 protein corresponds to the SEQ ID NO:3 and derivatives thereof."],"number":9,"annotation":false,"title":false,"claim":true},{"lines":["The method of any one of claims 8 or 9, wherein said cell further comprises a reporter gene under the control of a promoter sequence, and said RAC and PAK1proteins are each fused either with a transactivation domain or with a DNA binding domain specific of said promoter sequence, wherein the interaction of RAC with PAK1 results in the induction of expression of the reporter gene."],"number":10,"annotation":false,"title":false,"claim":true}]}},"filters":{"npl":[],"notNpl":[],"applicant":[],"notApplicant":[],"inventor":[],"notInventor":[],"owner":[],"notOwner":[],"tags":[],"dates":[],"types":[],"notTypes":[],"j":[],"notJ":[],"fj":[],"notFj":[],"classIpcr":[],"notClassIpcr":[],"classNat":[],"notClassNat":[],"classCpc":[],"notClassCpc":[],"so":[],"notSo":[],"sat":[]},"sequenceFilters":{"s":"SEQIDNO","d":"ASCENDING","p":0,"n":10,"sp":[],"si":[],"len":[],"t":[],"loc":[]}}