Tracking human multiple myeloma xenografts in NOD-Rag-1/IL-2 receptor gamma chain-null mice with the novel biomarker AKAP-4
- Leonardo Mirandola†1, 2,
- Yuefei Yu†1,
- Marjorie R Jenkins1, 2, 3,
- Raffaella Chiaramonte1, 4,
- Everardo Cobos1, 2,
- Constance M John5 and
- Maurizio Chiriva-Internati1, 2Email author
© Mirandola et al; licensee BioMed Central Ltd. 2011
Received: 26 March 2011
Accepted: 16 September 2011
Published: 16 September 2011
Multiple myeloma (MM) is a fatal malignancy ranking second in prevalence among hematological tumors. Continuous efforts are being made to develop innovative and more effective treatments. The preclinical evaluation of new therapies relies on the use of murine models of the disease.
Here we describe a new MM animal model in NOD-Rag1null IL2rgnull (NRG) mice that supports the engraftment of cell lines and primary MM cells that can be tracked with the tumor antigen, AKAP-4.
Human MM cell lines, U266 and H929, and primary MM cells were successfully engrafted in NRG mice after intravenous administration, and were found in the bone marrow, blood and spleen of tumor-challenged animals. The AKAP-4 expression pattern was similar to that of known MM markers, such as paraproteins, CD38 and CD45.
We developed for the first time a murine model allowing for the growth of both MM cell lines and primary cells in multifocal sites, thus mimicking the disease seen in patients. Additionally, we validated the use of AKAP-4 antigen to track tumor growth in vivo and to specifically identify MM cells in mouse tissues. We expect that our model will significantly improve the pre-clinical evaluation of new anti-myeloma therapies.
According to the American Cancer Society, more than 20,000 patients were diagnosed with multiple myeloma (MM) in the US in 2010. Among hematologic malignancies, MM ranks second in prevalence and has the shortest 5-year survival rate . Multiple myeloma (MM) is an age-related cancer caused by the accumulation of antibody-producing malignant plasma cells and leads to progressive osteolysis, defective hematopoiesis and renal failure . Recent progresses in understanding the molecular bases of MM have lead to the use of innovative drugs, such as bortezomib, thalidomide and lenalidomide . Unfortunately, although these therapies afforded a significant improvement in the disease course, MM remains invariably fatal because of the high rate of multidrug-resistant relapse . On these bases, constant efforts are dedicated to the evaluation of more effective treatment strategies [5–7].
Similarly to other malignancies , virtually any innovative treatment for MM requires a pre-clinical assessment, which largely relies on the use of animal models to evaluate the anti-tumor potential and possible toxicities [9–12]. To this goal, sub-lethally irradiated immunodeficient NOD/SCID mice have been extensively used since they allow for human MM cell line xenografting after intravenous injection [13–23]. More recently, it has been shown that NOD/SCID mice carrying nonfunctional IL-2 receptor gamma chain (NOD/SCID/γcnull, NOG) are more permissive recipients than NOD/SCID and can be easily xenografted with human MM cell lines to produce a disease similar to that seen in patients, including multiple metastatic sites and bone lesions [24, 25]. A further modification of the NOD strain, carrying double genetic disruptions of the Rag1 and the IL-2 receptor gamma chain genes, namely NOD-Rag1null IL2rgnull (NRG), has been reported to tolerate higher levels of radiation compared with NOD/SCID and NOG strains and to allow for efficient engraftment of human hematopoietic stem cells .
The development of successful animal models for MM also relies on the choice of the biomarkers used to track the disease course and to identify tumor cells in mouse tissues [27–32]. The A-kinase anchor protein 4 (AKAP-4)  is a scaffolding protein that participates in the intracellular signaling of protein kinase-A . AKAP-4 is a cancer/testis antigen (CTA), a class of tumor associated antigens characterized by high expression in germ cells and cancer, strong immunogenicity and very low expression or absence in normal tissues [35, 36]. We have previously shown that AKAP-4 is abnormally expressed at the mRNA and protein levels in MM cell lines and patients' MM primary cells, but absent in normal tissues, and therefore it is a potential novel biomarker for MM .
In this study, we used for the first time the NRG strain to establish an innovative model of MM, allowing for the growth and the spread of MM cell lines and primary patients' cells as well. Additionally, we provide evidence that the CTA AKAP-4 is a reliable and specific biomarker that can be used to track the growth of MM cell lines and primary cells in vivo.
Detection of tumor growth in vivo by ELISA
Flow-cytometry identification of MM cells from mouse tissues
Mean fluorescence intensity for U266 cells
Mean fluorescence intensity for H929 cells
Mean fluorescence intensity for primary MM cells
Analysis of AKAP-4 expression at the mRNA and protein levels in MM xenografts
AKAP-4 protein was detected by Western blot analysis (Figure 5) in MM cell lines, primary MM cells, bone marrow, peripheral blood and spleens of tumor-bearing mice, but not in tumor-free mice (healthy controls).
This study was aimed to establish and characterize a new murine model of disseminated MM, allowing for the engraftment of human MM cell lines and primary tumor cells derived from MM patients. To this goal, we used the NOD-Rag1null IL2rgnull (NRG) murine strain, intravenously injected with MM cell lines or with primary MM cells. The lacking of a functional IL-2 receptor makes IL2rgnull mice better xenograft recipients then NOD/SCID animals, because of the absence of NK cells . In addition, compared with NOD/SCID or NOD/SCID/γcnull (NOG) strains, NRG mice tolerate significantly higher levels of radiation. Differently from SCID mice, the NRG strain carries a functional Prkdc gene, which is essential for the repair of DNA damage induced by radiation in many tissues .
ELISA for serum MM paraproteins showed that xenografted animals supported the growth of both MM cell lines and primary tumor cells. Importantly, AKAP-4 was detectable in the sera of tumor-challenged mice and its levels increased over time, similarly to those of IgE and IgG. This indicates that AKAP-4 is a suitable biomarker for tracking MM progression in murine xenografts. Different techniques have been described to monitor the MM burden in animal models, such as fluorescent tagging of tumor cells [40–45] or measurement of MM-derived paraptrotein in the serum [29–32]. In the clinic, better methods for staging and monitoring the aggressiveness of MM, especially in assessing relapse, are thought to be critical to improve patients' outcomes and develop personalized therapies . A number of methods are under investigation, including mass spectrometry for the quantification of serum immunoglobulins , and immunohistochemistry for the expression of FGFR3 and cyclin D1 (reported in 15%, and 50% of patients with MM, respectively) [46, 47]. In this context, the identification of novel tumor antigens in the sera could be instrumental for a more sensitive detection of disease progression . Here we showed for the first time the use of AKAP-4 as a novel serum biomarker in MM animal models. Further investigations are warranted to evaluate AKAP-4 serum levels in MM patients and the correlation with treatment outcome.
Flow-cytometry analysis confirmed the presence of MM cell lines and primary patient's cells in the bone marrow, blood and spleen of tumor challenged mice, indicating that intravenously injected tumor cells were able to systemically disseminate in vivo. The specificity of this finding was confirmed by the failure to detect paraprotein- or AKAP-4- positive cells in tumor-free mice. Additionally, we showed that AKAP-4 was expressed in the same tissues at the transcriptional and protein levels in tumor-bearing animals, but absent in healthy controls. Collectively, these results indicate that our model is suitable for the growth and systemic dissemination of human MM cell lines and primary tumors. Currently available murine models for MM include immunocompetent mice, such as the 5TMM series [48, 49] and genetic models of MM [50–52], or immunocompromised mice, namely NOD/SCID [13–23], SCID-hu [53–56], and NOG [24, 25, 38, 57]. The 5TMM and the genetic models of MM have the advantage of affording pre-clinical studies in immunocompetent hosts, where possible effects of the therapy on the interaction between tumor cells and the immune system can be evaluated. However, molecular and biological differences exist between murine and human MM cells . Additionally, the number of available murine genetic models of MM and of 5TMM cell lines is extremely restricted and do not represent the heterogeneity of the human disease [50–52, 58, 59]. Therefore, it is evident that pre-clinical studies on MM cells of human origin are essential , but they are only feasible by using immunodeficient murine xenografts. Among these, subcutaneous inoculation of human MM cells has been extensively described [13, 17, 45, 60–62]. This model affords the possibility to directly assess changing in tumor growth induced by therapies. Yet, tumor cells growing subcutaneously do not interact with the bone marrow microenvironment, which largely accounts for MM drug resistance [61, 63]. Because we described the presence of tumor cells in the bone marrow of tumor-challenge mice, we propose that our model is suitable to evaluate the protective role played by the bone niche against anti-tumor therapies. Some concerns have been raised about the possibility that the interactions between MM cells and the bone stroma may be partially species-specific [11, 64]. To address this potential difficulty, the SCID-hu model was developed, in which MM cells are located in subcutaneously implanted human bone chips [53–56]. Although SCID-hu mice allow for the growth of MM cells in a bone niche of human origin [53–56], they do not reproduce the pattern of dissemination and multifocal spread seen in MM patients. Here we described for the first time a murine model supporting the engraftment human MM cells, and allowing for the development of a disease involving multiple sites, similar to that observed in patients [65–73]. This is an important advantage, because the effect of bone resorption in multiple osteolytic lesions is a critical factor for the survival of MM patients [6, 7]. Pre-clinical studies basing on immunocompromised xenograft models have previously described metastatic spread involving multiple bones, yet they have been limited to human MM cell lines [40, 41, 43, 44, 74–76]. In this study, we show that our model supports the metastatic growth of primary human MM cells. MM cell lines do not adequately represent the heterogeneity of the human disease because they are established from late stage disease and frequently present mutations not seen in patients . Therefore, the possibility to study not only cell lines, but also primary MM cells in murine models is relevant.
We presented here the proof-of-principle for the use of NRG mice as a new model supporting the metastatic growth of human MM cell lines and primary cells. Additionally, we propose the use of AKAP4 as a universal biomarker to track tumor cells in vivo. We foresee that our results will significantly contribute to the improvement of the pre-clinical evaluation of new anti-myeloma therapies. Because our model sustains the growth of primary MM cells, further investigations are warranted to study the suitability of this system to assess the efficacy of personalized therapies directly on patient's cells.
Six-week-old female NOD.Cg-Rag1tm1Mom IL2rgtm1Wjl/SzJ (NRG) mice were obtained from the Jackson Laboratory (Bar Harbor, ME, U.S.A.). All mice were maintained in filtered-air laminar-flow cabinets under specific pathogen-free conditions. Treatment and care of the animals were in accordance with the Institutional Guidelines and the Animal Welfare Assurance Act. The mice were checked daily and euthanized 6 weeks after tumor challenge or if they showed signs of excessive discomfort (hind leg paralysis, inability to move, eat or drink).
Human MM cell lines
The human MM cell lines U266 and H929 were purchased from the American Type Culture Collection (Manassas, VA, U.S.A.), and cultured in RPMI-1640 medium, supplemented with 10% V/V fetal bovine serum (FBS) and penicillin/streptomycin mix (10 mg/mL each) in 95% air and 5% CO2 at 37°C. Prior to injection, cells were washed once in PBS and then resuspended at 108 cells/mL in pre-warmed PBS prior to injection.
Primary MM cells
Human material was obtained under informed consent and with the approval from the local ethics committee. Bone marrow aspirate was obtained from a MM patient at diagnosis (Durie-Salmon stage III) from the hip bone. Light density cells were separated by ficoll hypaque centrifugation (Histopaque; Pharmacia, Uppsala, Sweden) , washed twice in PBS, counted and adjusted at the final concentration of 108 cells/mL in pre-warmed PBS prior to injection.
20 mice were sub-lethally irradiated with a total dose of 550 cGy at 139 cGy/min rate . After 6 hours, mice were assigned to the following groups (5 mice/group): group 1 received U266 cells, group 2 received H929, group 3 was given primary MM cells, while group 4 was left tumor-free and served as a negative control. Each mouse received 107 cells by a single intravenous injection in the lateral tail vein (100 μL/mouse).
ELISA for the measurement of serum paraprotein and AKAP-4 concentration
Blood (50 μL) was collected weekly from each mouse. Serum was prepared by centrifugation in the absence of anticoagulants and stored at -20°C until use. An enzyme-linked immunosorbent assay (ELISA) was performed on mouse sera for the determination of human paraprotein (IgE and IgG)  or AKAP-4 concentration. Antibodies were purchased from BD Biosciences (San Diego, CA, U.S.A.). 96-well polystyrene plates were coated with serum (50 μL/well diluted 1:10 in carbonate coating buffer), and incubated overnight at 4°C. Plates were washed three times in PBS containing 0.05% (V/V) Tween-20 (PBS/Tween) and then incubated in 1% bovine serum albumin (BSA) in PBS for 1 h at RT to block unspecific sites. After washing three times with PBS/Tween, plates were incubated at 37°C with 50 μL/well of primary anti-human IgE, IgG, or AKAP-4 antibodies (5 μg/mL in PBS) for 1 h. After washing twice with PBS/Tween, HRP-linked secondary antibody (1:4,000 dilution in PBS, 50 μL/well, Santa Cruz Biotechnology, CA, U.S.A.) was added and allowed to bind for 60 minutes at RT. After washing trice with PBS/Tween, 100 μL/well of TMP substrate (Abcam, Carpinteria, CA, U.S.A.) was added. The reaction was stopped 15 minutes later by adding 50 μL/well H2SO4 solution. Optical density (OD) was measured with a Victor2 plate reader (PerkinElmer, Waltham, MA) at 450 nm. All samples were analyzed in triplicates. Quantification of the target antigens was made by interpolation of the mean OD for each sample using a standard curve obtained by 13 serial 3-fold dilutions (from 2,400 to 1.5 × 10-3 ng/mL) of purified human paraproteins (GenWay Biotech, Inc., San Diego, CA, U.S.A.), or human AKAP-4 (Abnova, CA, U.S.A.).
Preparation of tissues
Femurs, hips, sternums, and spleens were mechanically disrupted in serum-free RPMI-1640 medium. Minced organs were placed into 250 mL flasks containing 3 mL of enzyme solution (0.14% collagenase type I; Sigma Aldrich, MO, U.S.A.) and 0.01% DNase (2000 kU/mg; Sigma Aldrich) in RPMI-1640 and incubated on a magnetic stirring apparatus at 37°C for 30 min. Then, cells were washed in PBS and filtered through a nylon mesh with 150 μm pores to generate single-cell suspensions. Blood (500 μL) was taken by retro-orbital venipuncture immediately after the euthanasia procedure and placed in a heparin-coated tube. Cells were harvested by centrifugation and washed twice in PBS before analyses.
The expression of human IgE, CD38, CD45 and AKAP-4 was analyzed by flow-cytometry 6 weeks after tumor injection as previously described . Specifically, IgE was used to identify U266 and H929 cells , while CD38 and CD45 were used as markers for human MM primary cells . AKAP-4 was analyzed in both cell lines and primary cells . U266, H929, primary MM cells and cells obtained from mouse bones, spleen and blood were fixed with 2% W/V buffered PFA (Sigma-Aldrich, MO, U.S.A) in PBS for 5 minutes at RT. After washing with PBS, cells were permeabilized with 0.3% saponin (Sigma-Aldrich, MO, U.S.A.) in PBS for 5 minutes at RT. After washing twice with PBS, cells were incubated on ice with monoclonal antibodies raised against human IgE, CD38, CD45 or AKAP-4 (Santa Cruz Biotechnology, CA, U.S.A.) or isotypic controls for 1 hour. After washing twice with PBS, cells were incubated with FITC-conjugated secondary antibodies (for IgE, AKAP-4 and CD45), or PE-conjugated secondary antibody (for CD38) (BD Biosciences, NJ, U.S.A.) for 1 h on ice. Analysis was performed using a BD FACScan (BD Biosciences, NJ, U.S.A), after 3 final washing steps with PBS.
RT-PCR and immunoblot
Total RNA was extracted from bone, spleen, blood, or from MM cell lines and primary MM cells by Trizol-reagent (Sigma, St Louis, MO, U.S.A.). Purified total RNA was treated with 5 μg RNase-free DNase I (Promega, Madison, WI, U.S.A.) at 37°C for 2 h. mRNA was then isolated using Oligotex mRNA Mini Kit (QIAGEN, Valencia, CA, U.S.A.). First-strand cDNA synthesis was performed using oligo (dT) 15-mers primers. PCR primers for AKAP-4 were as follows: forward 5'- GCGTACTCTGATACTACAATGATG -3' and reverse 5'- GGG GTTTTGGGTAAAGTCA- 3' . PCR was performed by 35 amplification cycles at 59°C annealing temperature. For each sample, RNA integrity was checked by amplification of the β-actin cDNA. Successful removal of genomic DNA contamination was confirmed by amplification of the RNA without prior reverse-transcription reaction. All results were confirmed in four independent RT-PCR tests. Immunoblots for AKAP-4 were performed using standard methods, as previously described . Positive controls for immunoblots were proteins extracted from injected MM cells. For healthy mice, protein extracts from human testis were used as positive controls (Applied Biosystems, Foster City, CA, USA) .
All data are expressed as mean values ± SEM (Standard Error of the Mean). Results were analyzed using GraphPad Prism software (GraphPad Software, Inc., CA, USA.). Statistical analyses were performed by the two-way ANOVA test. A p value < 0.05 was considered statistically significant.
List of abbreviations used
A kinase anchor protein
reverse-transcription polymerase chain reaction
enzyme-linked immunosorbent assay
nonobese diabetes/severe combined immunodeficiency
This work was supported by NIH Grant (R43 CA135862-01 to CMJ and MCI).
We thank Teri Fields for her assistance in editing this manuscript.
- Altekruse SF, Kosary CL, Krapcho M, Neyman N, Aminou R, Waldron W, Ruhl J, Howlader N, Tatalovich Z, Cho H, Mariotto A, Eisner MP, Lewis DR, Cronin K, Chen HS, Feuer EJ, Stinchcomb DG, Edwards BK, eds: SEER Cancer Statistics Review, 1975-2007, National Cancer Institute. Bethesda MD
- Kyle RA, Gertz MA, Witzig TE, Lust JA, Lacy MQ, Dispenzieri A, Fonseca R, Rajkumar SV, Offord JR, Larson DR, Plevak ME, Therneau TM, Greipp PR: Review of 1027 patients with newly diagnosed multiple myeloma. Mayo Clin Proc. 2003, 78 (1): 21-33. 10.4065/78.1.21.PubMedView Article
- Lonial S, Cavenagh J: Emerging combination treatment strategies containing novel agents in newly diagnosed multiple myeloma. Br J Haematol. 2009, 145 (6): 681-708. 10.1111/j.1365-2141.2009.07649.x.PubMedView Article
- Kastritis E, Zervas K, Symeonidis A, Terpos E, Delimbassi S, Anagnostopoulos N, Michali E, Zomas A, Katodritou E, Gika D, Pouli A, Christoulas D, Roussou M, Kartasis Z, Economopoulos T, Dimopoulos MA: Improved survival of patients with multiple myeloma after the introduction of novel agents and the applicability of the International Staging System (ISS): an analysis of the Greek Myeloma Study Group (GMSG). Leukemia. 2009, 23 (6): 1152-1157. 10.1038/leu.2008.402.PubMedView Article
- Kumar SK, Rajkumar SV, Dispenzieri A, Lacy MQ, Hayman SR, Buadi FK, Zeldenrust SR, Dingli D, Russell SJ, Lust JA, Greipp PR, Kyle RA, Gertz MA: Improved survival in multiple myeloma and the impact of novel therapies. Blood. 2008, 111 (5): 2516-2520. 10.1182/blood-2007-10-116129.PubMedPubMed CentralView Article
- Harousseau JL: Ten years of improvement in the management of multiple myeloma: 2000-2010. Clin Lymphoma Myeloma Leuk. 2010, 10 (6): 424-442. 10.3816/CLML.2010.n.076.PubMedView Article
- Harousseau JL, Attal M, Avet-Loiseau H: The role of complete response in multiple myeloma. Blood. 2009, 114 (15): 3139-3146. 10.1182/blood-2009-03-201053.PubMedView Article
- Bankert RB, Hess SD, Egilmez NK: SCID mouse models to study human cancer pathogenesis and approaches to therapy: potential, limitations, and future directions. Front Biosci. 2002, 1 (7): c44-62.View Article
- Dalton W, Anderson KC: Synopsis of a roundtable on validating novel therapeutics for multiple myeloma. Clin Cancer Res. 2006, 12 (22): 6603-6610. 10.1158/1078-0432.CCR-06-1489.PubMedView Article
- Epstein J, Yaccoby S: The SCID-hu myeloma model. Methods Mol Med. 2005, 113: 183-190.PubMed
- Mitsiades CS, Anderson KC, Carrasco DR: Mouse models of human myeloma. Hematol Oncol Clin North Am. 2007, 21 (6): 1051-1069. 10.1016/j.hoc.2007.08.003.PubMedView Article
- Podar K, Tai YT, Hideshima T, Vallet S, Richardson PG, Anderson KC: Emerging therapies for multiple myeloma. Expert Opin Emerg Drugs. 2009, 14 (1): 99-127. 10.1517/14728210802676278.PubMedPubMed CentralView Article
- Cocco C, Giuliani N, Di Carlo E, Ognio E, Storti P, Abeltino M, Sorrentino C, Ponzoni M, Ribatti D, Airoldi I: Interleukin-27 acts as multifunctional antitumor agent in multiple myeloma. Clin Cancer Res. 2010, 16 (16): 4188-4197. 10.1158/1078-0432.CCR-10-0173.PubMedView Article
- Dai Y, Chen S, Shah R, Pei XY, Wang L, Almenara JA, Kramer LB, Dent P, Grant S: Disruption of Src function potentiates Chk1-inhibitor-induced apoptosis in human multiple myeloma cells in vitro and in vivo. Blood. 2011, 117 (6): 1947-1957. 10.1182/blood-2010-06-291146.PubMedPubMed CentralView Article
- Manohar SM, Rathos MJ, Sonawane V, Rao SV, Joshi KS: Cyclin-dependent kinase inhibitor, P276-00 induces apoptosis in multiple myeloma cells by inhibition of Cdk9-T1 and RNA polymerase II-dependent transcription. Leuk Res. 2011, 7: 7-
- de Brito LR, Batey MA, Zhao Y, Squires MS, Maitland H, Leung HY, Hall AG, Jackson G, Newell DR, Irving JA: Comparative pre-clinical evaluation of receptor tyrosine kinase inhibitors for the treatment of multiple myeloma. Leuk Res. 2011, 10: 10-
- Li J, Favata M, Kelley JA, Caulder E, Thomas B, Wen X, Sparks RB, Arvanitis A, Rogers JD, Combs AP, Vaddi K, Solomon KA, Scherle PA, Newton R, Fridman JS: INCB16562, a JAK1/2 selective inhibitor, is efficacious against multiple myeloma cells and reverses the protective effects of cytokine and stromal cell support. Neoplasia. 2010, 12 (1): 28-38.PubMedPubMed CentralView Article
- Tong AW, Huang YW, Zhang BQ, Netto G, Vitetta ES, Stone MJ: Heterotransplantation of human multiple myeloma cell lines in severe combined immunodeficiency (SCID) mice. Anticancer Res. 1993, 13 (3): 593-597.PubMed
- LeBlanc R, Catley LP, Hideshima T, Lentzsch S, Mitsiades CS, Mitsiades N, Neuberg D, Goloubeva O, Pien CS, Adams J, Gupta D, Richardson PG, Munshi NC, Anderson KC: Proteasome inhibitor PS-341 inhibits human myeloma cell growth in vivo and prolongs survival in a murine model. Cancer Res. 2002, 62 (17): 4996-5000.PubMed
- Podar K, Tonon G, Sattler M, Tai YT, Legouill S, Yasui H, Ishitsuka K, Kumar S, Kumar R, Pandite LN, Hideshima T, Chauhan D, Anderson KC: The small-molecule VEGF receptor inhibitor pazopanib (GW786034B) targets both tumor and endothelial cells in multiple myeloma. Proc Natl Acad Sci USA. 2006, 103 (51): 19478-19483. 10.1073/pnas.0609329103.PubMedPubMed CentralView Article
- Navas TA, Nguyen AN, Hideshima T, Reddy M, Ma JY, Haghnazari E, Henson M, Stebbins EG, Kerr I, O'Young G, Kapoun AM, Chakravarty S, Mavunkel B, Perumattam J, Luedtke G, Dugar S, Medicherla S, Protter AA, Schreiner GF, Anderson KC, Higgins LS: Inhibition of p38alpha MAPK enhances proteasome inhibitor-induced apoptosis of myeloma cells by modulating Hsp27, Bcl-X(L), Mcl-1 and p53 levels in vitro and inhibits tumor growth in vivo. Leukemia. 2006, 20 (6): 1017-1027. 10.1038/sj.leu.2404200.PubMedView Article
- Carlo-Stella C, Guidetti A, Di Nicola M, Longoni P, Cleris L, Lavazza C, Milanesi M, Milani R, Carrabba M, Farina L, Formelli F, Gianni AM, Corradini P: CD52 antigen expressed by malignant plasma cells can be targeted by alemtuzumab in vivo in NOD/SCID mice. Exp Hematol. 2006, 34 (6): 721-727. 10.1016/j.exphem.2006.03.005.PubMedView Article
- Baughn LB, Di Liberto M, Wu K, Toogood PL, Louie T, Gottschalk R, Niesvizky R, Cho H, Ely S, Moore MA, Chen-Kiang S: A novel orally active small molecule potently induces G1 arrest in primary myeloma cells and prevents tumor growth by specific inhibition of cyclin-dependent kinase 4/6. Cancer Res. 2006, 66 (15): 7661-7667. 10.1158/0008-5472.CAN-06-1098.PubMedView Article
- Watanabe M, Dewan MZ, Okamura T, Sasaki M, Itoh K, Higashihara M, Mizoguchi H, Honda M, Sata T, Watanabe T, Yamamoto N, Umezawa K, Horie R: A novel NF-kappaB inhibitor DHMEQ selectively targets constitutive NF-kappaB activity and induces apoptosis of multiple myeloma cells in vitro and in vivo. Int J Cancer. 2005, 114 (1): 32-38. 10.1002/ijc.20688.PubMedView Article
- Dewan MZ, Watanabe M, Terashima K, Aoki M, Sata T, Honda M, Ito M, Yamaoka S, Watanabe T, Horie R, Yamamoto N: Prompt tumor formation and maintenance of constitutive NF-kappaB activity of multiple myeloma cells in NOD/SCID/gammacnull mice. Cancer Sci. 2004, 95 (7): 564-568. 10.1111/j.1349-7006.2004.tb02487.x.PubMedView Article
- Pearson T, Shultz LD, Miller D, King M, Laning J, Fodor W, Cuthbert A, Burzenski L, Gott B, Lyons B, Foreman O, Rossini AA, Greiner DL: Non-obese diabetic-recombination activating gene-1 (NOD-Rag1 null) interleukin (IL)-2 receptor common gamma chain (IL2r gamma null) null mice: a radioresistant model for human lymphohaematopoietic engraftment. Clin Exp Immunol. 2008, 154 (2): 270-284. 10.1111/j.1365-2249.2008.03753.x.PubMedPubMed CentralView Article
- Mitsiades CS, Mitsiades NS, Bronson RT, Chauhan D, Munshi N, Treon SP, Maxwell CA, Pilarski L, Hideshima T, Hoffman RM, Anderson KC: Fluorescence imaging of multiple myeloma cells in a clinically relevant SCID/NOD in vivo model: biologic and clinical implications. Cancer Res. 2003, 63 (20): 6689-6696.PubMed
- Asosingh K, De Raeve H, Van Riet I, Van Camp B, Vanderkerken K: Multiple myeloma tumor progression in the 5T2MM murine model is a multistage and dynamic process of differentiation, proliferation, invasion, and apoptosis. Blood. 2003, 101 (8): 3136-3141. 10.1182/blood-2002-10-3000.PubMedView Article
- Chantry AD, Heath D, Mulivor AW, Pearsall S, Baud'huin M, Coulton L, Evans H, Abdul N, Werner ED, Bouxsein ML, Key ML, Seehra J, Arnett TR, Vanderkerken K, Croucher P: Inhibiting activin-A signaling stimulates bone formation and prevents cancer-induced bone destruction in vivo. Journal of Bone and Mineral Research. 2010, 25 (12): 2633-2646. 10.1002/jbmr.142.PubMedView Article
- Campbell RA, Sanchez E, Steinberg J, Shalitin D, Li ZW, Chen H, Berenson JR: Vorinostat enhances the antimyeloma effects of melphalan and bortezomib. Eur J Haematol. 2010, 84 (3): 201-211. 10.1111/j.1600-0609.2009.01384.x.PubMedView Article
- Sordillo EM, Pearse RN: RANK-Fc: a therapeutic antagonist for RANK-L in myeloma. Cancer. 2003, 97 (3 Suppl): 802-812.PubMedView Article
- Campbell RA, Sanchez E, Steinberg JA, Baritaki S, Gordon M, Wang C, Shalitin D, Chen H, Pang S, Bonavida B, Said J, Berenson JR: Antimyeloma effects of arsenic trioxide are enhanced by melphalan, bortezomib and ascorbic acid. Br J Haematol. 2007, 138 (4): 467-478. 10.1111/j.1365-2141.2007.06675.x.PubMedView Article
- Turner RM, Johnson LR, Haig-Ladewig L, Gerton GL, Moss SB: An X-linked gene encodes a major human sperm fibrous sheath protein, hAKAP82. Genomic organization, protein kinase A-RII binding, and distribution of the precursor in the sperm tail. J Biol Chem. 1998, 273 (48): 32135-32141. 10.1074/jbc.273.48.32135.PubMedView Article
- Turner RM, Musse MP, Mandal A, Klotz K, Jayes FC, Herr JC, Gerton GL, Moss SB, Chemes HE: Molecular genetic analysis of two human sperm fibrous sheath proteins, AKAP4 and AKAP3, in men with dysplasia of the fibrous sheath. J Androl. 2001, 22 (2): 302-315.PubMed
- Chiriva-Internati M, Cobos E, Da Silva DM, Kast WM: Sperm fibrous sheath proteins: a potential new class of target antigens for use in human therapeutic cancer vaccines. Cancer Immun. 2008, 8: 8-PubMedPubMed Central
- Scanlan MJ, Gure AO, Jungbluth AA, Old LJ, Chen YT: Cancer/testis antigens: an expanding family of targets for cancer immunotherapy. Immunol Rev. 2002, 188: 22-32. 10.1034/j.1600-065X.2002.18803.x.PubMedView Article
- Chiriva-Internati M, Ferrari R, Yu Y, Hamrick C, Gagliano N, Grizzi F, Frezza E, Jenkins MR, Hardwick F, D'Cunha N, Kast WM, Cobos E: AKAP-4: a novel cancer testis antigen for multiple myeloma. Br J Haematol. 2008, 140 (4): 465-8. 10.1111/j.1365-2141.2007.06940.x.PubMedView Article
- Miyakawa Y, Ohnishi Y, Tomisawa M, Monnai M, Kohmura K, Ueyama Y, Ito M, Ikeda Y, Kizaki M, Nakamura M: Establishment of a new model of human multiple myeloma using NOD/SCID/gammac(null) (NOG) mice. Biochem Biophys Res Commun. 2004, 313 (2): 258-262. 10.1016/j.bbrc.2003.11.120.PubMedView Article
- Yaccoby S, Barlogie B, Epstein J: Primary myeloma cells growing in SCID-hu mice: a model for studying the biology and treatment of myeloma and its manifestations. Blood. 1998, 92 (8): 2908-2913.PubMed
- Dutta-Simmons J, Zhang Y, Gorgun G, Gatt M, Mani M, Hideshima T, Takada K, Carlson NE, Carrasco DE, Tai YT, Raje N, Letai AG, Anderson KC, Carrasco DR: Aurora kinase A is a target of Wnt/beta-catenin involved in multiple myeloma disease progression. Blood. 2009, 114 (13): 2699-2708.PubMedView Article
- Azab AK, Runnels JM, Pitsillides C, Moreau AS, Azab F, Leleu X, Jia X, Wright R, Ospina B, Carlson AL, Alt C, Burwick N, Roccaro AM, Ngo HT, Farag M, Melhem MR, Sacco A, Munshi NC, Hideshima T, Rollins BJ, Anderson KC, Kung AL, Lin CP, Ghobrial IM: CXCR4 inhibitor AMD3100 disrupts the interaction of multiple myeloma cells with the bone marrow microenvironment and enhances their sensitivity to therapy. Blood. 2009, 113 (18): 4341-4351. 10.1182/blood-2008-10-186668.PubMedPubMed CentralView Article
- Labrinidis A, Diamond P, Martin S, Hay S, Liapis V, Zinonos I, Sims NA, Atkins GJ, Vincent C, Ponomarev V, Findlay DM, Zannettino AC, Evdokiou A: Apo2L/TRAIL inhibits tumor growth and bone destruction in a murine model of multiple myeloma. Clin Cancer Res. 2009, 15 (6): 1998-2009. 10.1158/1078-0432.CCR-08-2444.PubMedView Article
- Reijmers RM, Groen RW, Rozemuller H, Kuil A, de Haan-Kramer A, Csikos T, Martens AC, Spaargaren M, Pals ST: Targeting EXT1 reveals a crucial role for heparan sulfate in the growth of multiple myeloma. Blood. 2010, 115 (3): 601-604. 10.1182/blood-2009-02-204396.PubMedView Article
- Nakashima T, Ishii T, Tagaya H, Seike T, Nakagawa H, Kanda Y, Akinaga S, Soga S, Shiotsu Y: New molecular and biological mechanism of antitumor activities of KW-2478, a novel nonansamycin heat shock protein 90 inhibitor, in multiple myeloma cells. Clin Cancer Res. 2010, 16 (10): 2792-2802. 10.1158/1078-0432.CCR-09-3112.PubMedView Article
- Lavazza C, Carlo-Stella C, Giacomini A, Cleris L, Righi M, Sia D, Di Nicola M, Magni M, Longoni P, Milanesi M, Francolini M, Gloghini A, Carbone A, Formelli F, Gianni AM: Human CD34+ cells engineered to express membrane-bound tumor necrosis factor-related apoptosis-inducing ligand target both tumor cells and tumor vasculature. Blood. 2010, 115 (11): 2231-2240. 10.1182/blood-2009-08-239632.PubMedView Article
- Koomen JM, Haura EB, Bepler G, Sutphen R, Remily-Wood ER, Benson K, Hussein M, Hazlehurst LA, Yeatman TJ, Hildreth LT, Sellers TA, Jacobsen PB, Fenstermacher DA, Dalton WS: Proteomic contributions to personalized cancer care. Mol Cell Proteomics. 2008, 7 (10): 1780-1794. 10.1074/mcp.R800002-MCP200.PubMedPubMed CentralView Article
- Yeung J, Chang H: Genomic aberrations and immunohistochemical markers as prognostic indicators in multiple myeloma. J Clin Pathol. 2008, 61 (7): 832-836. 10.1136/jcp.2007.049585.PubMedView Article
- Croese JW, Vas Nunes CM, Radl J, van den Enden-Vieveen MH, Brondijk RJ, Boersma WJ: The 5T2 mouse multiple myeloma model: characterization of 5T2 cells within the bone marrow. Br J Cancer. 1987, 56 (5): 555-560. 10.1038/bjc.1987.241.PubMedPubMed CentralView Article
- Vanderkerken K, De Raeve H, Goes E, Van Meirvenne S, Radl J, Van Riet I, Thielemans K, Van Camp B: Organ involvement and phenotypic adhesion profile of 5T2 and 5T33 myeloma cells in the C57BL/KaLwRij mouse. Br J Cancer. 1997, 76 (4): 451-460. 10.1038/bjc.1997.409.PubMedPubMed CentralView Article
- Campbell RA, Manyak SJ, Yang HH, Sjak-Shie NN, Chen H, Gui D, Popoviciu L, Wang C, Gordon M, Pang S, Bonavida B, Said J, Berenson JR: LAGlambda-1: a clinically relevant drug resistant human multiple myeloma tumor murine model that enables rapid evaluation of treatments for multiple myeloma. Int J Oncol. 2006, 28 (6): 1409-1417.PubMed
- Kovalchuk AL, Kim JS, Park SS, Coleman AE, Ward JM, Morse HC, Kishimoto T, Potter M, Janz S: IL-6 transgenic mouse model for extraosseous plasmacytoma. Proc Natl Acad Sci USA. 2002, 99 (3): 1509-1514. 10.1073/pnas.022643999.PubMedPubMed CentralView Article
- Cheung WC, Kim JS, Linden M, Peng L, Van Ness B, Polakiewicz RD, Janz S: Novel targeted deregulation of c-Myc cooperates with Bcl-X(L) to cause plasma cell neoplasms in mice. J Clin Invest. 2004, 113 (12): 1763-1773.PubMedPubMed CentralView Article
- Yaccoby S, Epstein J: The proliferative potential of myeloma plasma cells manifest in the SCID-hu host. Blood. 1999, 94 (10): 3576-3582.PubMed
- Yaccoby S, Johnson CL, Mahaffey SC, Wezeman MJ, Barlogie B, Epstein J: Antimyeloma efficacy of thalidomide in the SCID-hu model. Blood. 2002, 100 (12): 4162-4168. 10.1182/blood-2002-03-0939.PubMedView Article
- Pearse RN, Sordillo EM, Yaccoby S, Wong BR, Liau DF, Colman N, Michaeli J, Epstein J, Choi Y: Multiple myeloma disrupts the TRANCE/osteoprotegerin cytokine axis to trigger bone destruction and promote tumor progression. Proc Natl Acad Sci USA. 2001, 98 (20): 11581-11586. 10.1073/pnas.201394498.PubMedPubMed CentralView Article
- Araki K, Sangai T, Miyamoto S, Maeda H, Zhang SC, Nakamura M, Ishii G, Hasebe T, Kusaka H, Akiyama T, Tokuda Y, Nagai K, Minami H, Ochiai A: Inhibition of bone-derived insulin-like growth factors by a ligand-specific antibody suppresses the growth of human multiple myeloma in the human adult bone explanted in NOD/SCID mouse. Int J Cancer. 2006, 118 (10): 2602-2608. 10.1002/ijc.21653.PubMedView Article
- Bueno C, Lopes LF, Greaves M, Menendez P: Toward development of a novel NOD/SCID-based in vivo strategy to model multiple myeloma pathogenesis. Exp Hematol. 2007, 35 (10): 1477-8. 10.1016/j.exphem.2007.06.012. Epub 2007 Aug 3PubMedView Article
- van den Akker TW, Radl J, Franken-Postma E, Hagemeijer A: Cytogenetic findings in mouse multiple myeloma and Waldenstrom's macroglobulinemia. Cancer Genet Cytogenet. 1996, 86 (2): 156-161. 10.1016/0165-4608(95)00169-7.PubMedView Article
- Radl J, Punt YA, van den Enden-Vieveen MH, Bentvelzen PA, Bakkus MH, van den Akker TW, Benner R: The 5T mouse multiple myeloma model: absence of c-myc oncogene rearrangement in early transplant generations. Br J Cancer. 1990, 61 (2): 276-278. 10.1038/bjc.1990.51.PubMedPubMed CentralView Article
- Fernandes MS, Gomes EM, Butcher LD, Hernandez-Alcoceba R, Chang D, Kansopon J, Newman J, Stone MJ, Tong AW: Growth inhibition of human multiple myeloma cells by an oncolytic adenovirus carrying the CD40 ligand transgene. Clin Cancer Res. 2009, 15 (15): 4847-4856. 10.1158/1078-0432.CCR-09-0451.PubMedView Article
- Chauhan D, Singh AV, Aujay M, Kirk CJ, Bandi M, Ciccarelli B, Raje N, Richardson P, Anderson KC: A novel orally active proteasome inhibitor ONX 0912 triggers in vitro and in vivo cytotoxicity in multiple myeloma. Blood. 2010, 116 (23): 4906-4915. 10.1182/blood-2010-04-276626.PubMedPubMed CentralView Article
- Singh AV, Bandi M, Aujay MA, Kirk CJ, Hark DE, Raje N, Chauhan D, Anderson KC: PR-924, a selective inhibitor of the immunoproteasome subunit LMP-7, blocks multiple myeloma cell growth both in vitro and in vivo. Br J Haematol. 2011, 152 (2): 155-163. 10.1111/j.1365-2141.2010.08491.x.PubMedPubMed CentralView Article
- Nefedova Y, Landowski TH, Dalton WS: Bone marrow stromal-derived soluble factors and direct cell contact contribute to de novo drug resistance of myeloma cells by distinct mechanisms. Leukemia. 2003, 17 (6): 1175-1182. 10.1038/sj.leu.2402924.PubMedView Article
- Urashima M, Chen BP, Chen S, Pinkus GS, Bronson RT, Dedera DA, Hoshi Y, Teoh G, Ogata A, Treon SP, Chauhan D, Anderson KC: The development of a model for the homing of multiple myeloma cells to human bone marrow. Blood. 1997, 90 (2): 754-765.PubMed
- Barlogie B, Shaughnessy J, Tricot G, Jacobson J, Zangari M, Anaissie E, Walker R, Crowley J: Treatment of multiple myeloma. Blood. 2004, 103 (1): 20-32. 10.1182/blood-2003-04-1045.PubMedView Article
- Hideshima T, Bergsagel PL, Kuehl WM, Anderson KC: Advances in biology of multiple myeloma: clinical applications. Blood. 2004, 104 (3): 607-618. 10.1182/blood-2004-01-0037.PubMedView Article
- Steensma DP, Gertz MA, Greipp PR, Kyle RA, Lacy MQ, Lust JA, Offord JR, Plevak MF, Therneau TM, Witzig TE: A high bone marrow plasma cell labeling index in stable plateau-phase multiple myeloma is a marker for early disease progression and death. Blood. 2001, 97 (8): 2522-2523. 10.1182/blood.V97.8.2522.PubMedView Article
- Vande Broek I, Vanderkerken K, Van Camp B, Van Riet I: Extravasation and homing mechanisms in multiple myeloma. Clin Exp Metastasis. 2008, 25 (4): 325-334. 10.1007/s10585-007-9108-4.PubMedView Article
- Moulopoulos LA, Dimopoulos MA, Vourtsi A, Gouliamos A, Vlahos L: Bone lesions with soft-tissue mass: magnetic resonance imaging diagnosis of lymphomatous involvement of the bone marrow versus multiple myeloma and bone metastases. Leuk Lymphoma. 1999, 34 (1-2): 179-184.PubMed
- Santonocito AM, Consoli U, Bagnato S, Milone G, Palumbo GA, Di Raimondo F, Stagno F, Guglielmo P, Giustolisi R: Flow cytometric detection of aneuploid CD38(++) plasmacells and CD19(+) B-lymphocytes in bone marrow, peripheral blood and PBSC harvest in multiple myeloma patients. Leuk Res. 2004, 28 (5): 469-477. 10.1016/j.leukres.2003.09.015.PubMedView Article
- Tong WG, Chen R, Plunkett W, Siegel D, Sinha R, Harvey RD, Badros AZ, Popplewell L, Coutre S, Fox JA, Mahadocon K, Chen T, Kegley P, Hoch U, Wierda WG: Phase I and pharmacologic study of SNS-032, a potent and selective Cdk2, 7, and 9 inhibitor, in patients with advanced chronic lymphocytic leukemia and multiple myeloma. J Clin Oncol. 2010, 28 (18): 3015-3022. 10.1200/JCO.2009.26.1347.PubMedView Article
- Hall MN, Jagannathan JP, Ramaiya NH, Shinagare AB, Van den Abbeele AD: Imaging of extraosseous myeloma: CT, PET/CT, and MRI features. AJR Am J Roentgenol. 2010, 195 (5): 1057-1065. 10.2214/AJR.10.4384.PubMedView Article
- Winterbottom AP, Shaw AS: Imaging patients with myeloma. Clin Radiol. 2009, 64 (1): 1-11. 10.1016/j.crad.2008.07.006.PubMedView Article
- Rabin N, Kyriakou C, Coulton L, Gallagher OM, Buckle C, Benjamin R, Singh N, Glassford J, Otsuki T, Nathwani AC, Croucher PI, Yong KL: A new xenograft model of myeloma bone disease demonstrating the efficacy of human mesenchymal stem cells expressing osteoprotegerin by lentiviral gene transfer. Leukemia. 2007, 21 (10): 2181-2191. 10.1038/sj.leu.2404814.PubMedView Article
- Gatt ME, Zhao JJ, Ebert MS, Zhang Y, Chu Z, Mani M, Gazit R, Carrasco DE, Dutta-Simmons J, Adamia S, Minvielle S, Tai YT, Munshi NC, Avet-Loiseau H, Anderson KC, Carrasco DR: MicroRNAs 15a/16-1 function as tumor suppressor genes in multiple myeloma. Blood. 2010
- de Weers M, Tai YT, van der Veer MS, Bakker JM, Vink T, Jacobs DC, Oomen LA, Peipp M, Valerius T, Slootstra JW, Mutis T, Bleeker WK, Anderson KC, Lokhorst HM, van de Winkel JG, Parren PW: Daratumumab, a novel therapeutic human CD38 monoclonal antibody, induces killing of multiple myeloma and other hematological tumors. J Immunol. 2011, 186 (3): 1840-1848. 10.4049/jimmunol.1003032.PubMedView Article
- Lim SH, Wang Z, Chiriva-Internati M, Xue Y: Sperm protein 17 is a novel cancer-testis antigen in multiple myeloma. Blood. 2001, 97 (5): 1508-1510. 10.1182/blood.V97.5.1508.PubMedView Article
- Towbin H, Staehelin T, Gordon J: Electrophoretic transfer of proteins from polyacrylamide gels to nitrocellulose sheets: procedure and some applications. Proc Natl Acad Sci USA. 1979, 76 (9): 4350-4354. 10.1073/pnas.76.9.4350.PubMedPubMed CentralView Article
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2407/11/394/prepub
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