Rated high binding to the human MM cells RPMI-8226 in vitro that was significantly blocked (P,0.0001) in the presence of the cold targeting ligand. Pilot imaging studies in the orthotopic (intravenous, i.v.) mouse models of mouse (5TGM1) and human (RPMI8226) MM are ongoing.published mouse MM cell line 5TGM1 [28] (a gift from Dr. G. Mundy, Vanderbilt University, Nashville, Tennessee) was grown in DMEM supplemented with 10 fetal bovine serum, penicillin (100 U/ml) and streptomycin (50 mg/ml). Long term culture of the cells occurred in a water jacketed incubator at 37uC 
and 5 CO2. Assays were also carried out under these respective conditions.Flow CytometryPE-conjugated mAb to mouse 
CD49d (Integrin alpha 4) was purchased from eBioscience. 5TGM1 cells were prepared for flow 23977191 cytometry by incubating cells with mAb followed by PBS washes. Data collection and analyses were performed on a FACScalibur flow cytometer (Becton Dickinson Immunocytometry Systems, Mountain View, California, USA).Materials and Methods Ethics StatementAll experiments involving the use of radioactive materials at Washington University were conducted under the authorization of the Radiation Safety Committee in accordance with the University’s Nuclear Regulatory Commission license. All animal studies were performed under the Guide for the Care and Use of Laboratory Animals under the auspices of the Washington University Animal Studies Committee. This study was approved by the Washington University Animal Studies Committee (Animal protocol # 20090058).In Vitro Cell Uptake AssayCell uptake assays were performed in murine 5TGM1 and human RPMI-8226 JSI124 myeloma cells using 64Cu-CB-TE1A1PLLP2A to determine the sum of cell internalized and surfacebound fractions. Cells were grown in Iscoves MDM until 60275 confluent, harvested by mechanical dissociation, and re-suspended in the binding medium (phosphate buffered saline [PBS], 0.1 bovine serum albumin [BSA] and 1 mM Mn2+) in 1.5 mL microfuge tubes. A solution of 64Cu-CB-TE1A1P-LLP2A (0.1 nM) was added to the cell suspension. The samples were incubated for 60 min in a cell incubator (37uC, 5 CO2). To determine the in vitro VLA-4 binding specificity of 64Cu-CBTE1A1P-LLP2A, samples were co-incubated with ,200-fold excess of the unlabeled ligand, LLP2A. After incubation, the samples were centrifuged at 1,500 rpm for 5 min, and the radioactive medium was removed. Cell pellets were rinsed with ice cold binding buffer (500 mL) and centrifuged at 1,500 rpm for 3 min (2 X). The radioactivity in cell pellets was measured in a well 166518-60-1 counter (Packard II gamma counter).MaterialsCopper-64 (t1/2 = 12.7 h, b+; 17.8 , Eb+ max = 656 KeV, b-, 38.4 , Eb -max = 573 KeV) was produced on a CS-15 biomedical cyclotron at Washington University School of Medicine [25]. All chemicals were purchased from Sigma-Aldrich (St. Louis, MO), unless otherwise specified, and solutions were prepared using ultrapure water (18 MV-cm resistivity). Radiochemistry reaction progress and purity were monitored by analytical reversed-phase high performance liquid chromatography (HPLC), which was performed on a Waters 600E chromatography system (Milford, MA) with a Waters 991 photodiode array detector and an Ortec Model 661 radioactivity detector (EG G Instruments, Oak Ridge, TN). An Altima C18 RocketH column was employed with a gradient that changes from 0.1 TFA in water to 30:70 0.1 TFA/Water:0.1 TFA/CH3CN over the course of 5 min. Radioactive samples were counted using a Beck.Rated high binding to the human MM cells RPMI-8226 in vitro that was significantly blocked (P,0.0001) in the presence of the cold targeting ligand. Pilot imaging studies in the orthotopic (intravenous, i.v.) mouse models of mouse (5TGM1) and human (RPMI8226) MM are ongoing.published mouse MM cell line 5TGM1 [28] (a gift from Dr. G. Mundy, Vanderbilt University, Nashville, Tennessee) was grown in DMEM supplemented with 10 fetal bovine serum, penicillin (100 U/ml) and streptomycin (50 mg/ml). Long term culture of the cells occurred in a water jacketed incubator at 37uC and 5 CO2. Assays were also carried out under these respective conditions.Flow CytometryPE-conjugated mAb to mouse CD49d (Integrin alpha 4) was purchased from eBioscience. 5TGM1 cells were prepared for flow 23977191 cytometry by incubating cells with mAb followed by PBS washes. Data collection and analyses were performed on a FACScalibur flow cytometer (Becton Dickinson Immunocytometry Systems, Mountain View, California, USA).Materials and Methods Ethics StatementAll experiments involving the use of radioactive materials at Washington University were conducted under the authorization of the Radiation Safety Committee in accordance with the University’s Nuclear Regulatory Commission license. All animal studies were performed under the Guide for the Care and Use of Laboratory Animals under the auspices of the Washington University Animal Studies Committee. This study was approved by the Washington University Animal Studies Committee (Animal protocol # 20090058).In Vitro Cell Uptake AssayCell uptake assays were performed in murine 5TGM1 and human RPMI-8226 myeloma cells using 64Cu-CB-TE1A1PLLP2A to determine the sum of cell internalized and surfacebound fractions. Cells were grown in Iscoves MDM until 60275 confluent, harvested by mechanical dissociation, and re-suspended in the binding medium (phosphate buffered saline [PBS], 0.1 bovine serum albumin [BSA] and 1 mM Mn2+) in 1.5 mL microfuge tubes. A solution of 64Cu-CB-TE1A1P-LLP2A (0.1 nM) was added to the cell suspension. The samples were incubated for 60 min in a cell incubator (37uC, 5 CO2). To determine the in vitro VLA-4 binding specificity of 64Cu-CBTE1A1P-LLP2A, samples were co-incubated with ,200-fold excess of the unlabeled ligand, LLP2A. After incubation, the samples were centrifuged at 1,500 rpm for 5 min, and the radioactive medium was removed. Cell pellets were rinsed with ice cold binding buffer (500 mL) and centrifuged at 1,500 rpm for 3 min (2 X). The radioactivity in cell pellets was measured in a well counter (Packard II gamma counter).MaterialsCopper-64 (t1/2 = 12.7 h, b+; 17.8 , Eb+ max = 656 KeV, b-, 38.4 , Eb -max = 573 KeV) was produced on a CS-15 biomedical cyclotron at Washington University School of Medicine [25]. All chemicals were purchased from Sigma-Aldrich (St. Louis, MO), unless otherwise specified, and solutions were prepared using ultrapure water (18 MV-cm resistivity). Radiochemistry reaction progress and purity were monitored by analytical reversed-phase high performance liquid chromatography (HPLC), which was performed on a Waters 600E chromatography system (Milford, MA) with a Waters 991 photodiode array detector and an Ortec Model 661 radioactivity detector (EG G Instruments, Oak Ridge, TN). An Altima C18 RocketH column was employed with a gradient that changes from 0.1 TFA in water to 30:70 0.1 TFA/Water:0.1 TFA/CH3CN over the course of 5 min. Radioactive samples were counted using a Beck.