Comparative biodistribution of indium- and yttrium-labeled B3 monoclonal antibody conjugated to either 2-(p-SCN-Bz)-6-methyl-DTPA (1 B4M-DTPA) or 2-(p-SCN-Bz)-1,4,7,10-tetraazacyclododecane tetraacetic acid (2B-DOTA)

1994 ◽  
Vol 21 (7) ◽  
pp. 640-646 ◽  
Author(s):  
Luigi Camera ◽  
Seigo Kinuya ◽  
Kayhan Garmestani ◽  
Martin W. Brechbiel ◽  
Chuanchu Wu ◽  
...  
Keyword(s):  
Monoclonal Antibody ◽  
Tetraacetic Acid ◽  
Tetraazacyclododecane Tetraacetic Acid

scholarly journals Evaluation of Radiolabeled Girentuximab In Vitro and In Vivo

2018 ◽  
Vol 11 (4) ◽  
pp. 132 ◽  
Author(s):  
Tais Basaco ◽  
Stefanie Pektor ◽  
Josue Bermudez ◽  
Niurka Meneses ◽  
Manfred Heller ◽  
...  
Keyword(s):  
Specific Binding ◽  
Sodium Ascorbate ◽  
Tumor Uptake ◽  
Tetraacetic Acid ◽  
In Vivo Experiments ◽  
Caix Expression ◽  
Tetraazacyclododecane Tetraacetic Acid

Girentuximab (cG250) targets carbonic anhydrase IX (CAIX), a protein which is expressed on the surface of most renal cancer cells (RCCs). cG250 labeled with 177Lu has been used in clinical trials for radioimmunotherapy (RIT) of RCCs. In this work, an extensive characterization of the immunoconjugates allowed optimization of the labeling conditions with 177Lu while maintaining immunoreactivity of cG250, which was then investigated in in vitro and in vivo experiments. cG250 was conjugated with S-2-(4-isothiocyanatobenzyl)-1,4,7,10-tetraazacyclododecane tetraacetic acid (DOTA(SCN)) by using incubation times between 30 and 90 min and characterized by mass spectrometry. Immunoconjugates with five to ten DOTA(SCN) molecules per cG250 molecule were obtained. Conjugates with ratios less than six DOTA(SCN)/cG250 had higher in vitro antigen affinity, both pre- and postlabeling with 177Lu. Radiochemical stability increased, in the presence of sodium ascorbate, which prevents radiolysis. The immunoreactivity of the radiolabeled cG250 tested by specific binding to SK-RC-52 cells decreased when the DOTA content per conjugate increased. The in vivo tumor uptake was < 10% ID/g and independent of the total amount of protein in the range between 5 and 100 µg cG250 per animal. Low tumor uptake was found to be due to significant necrotic areas and heterogeneous CAIX expression. In addition, low vascularity indicated relatively poor accessibility of the CAIX target.

Cohort Study of Somatostatin-Based Radiopeptide Therapy With [90Y-DOTA]-TOC Versus [90Y-DOTA]-TOC Plus [177Lu-DOTA]-TOC in Neuroendocrine Cancers

2012 ◽  
Vol 30 (10) ◽  
pp. 1100-1106 ◽  
Author(s):  
Linda Villard ◽  
Anna Romer ◽  
Nicolas Marincek ◽  
Philippe Brunner ◽  
Michael T. Koller ◽  
...  
Keyword(s):  
Cohort Study ◽  
Current Practice ◽  
Cox Regression ◽  
Renal Toxicity ◽  
Tetraacetic Acid ◽  
Neuroendocrine Cancer ◽  
Radiopeptide Therapy ◽  
Tetraazacyclododecane Tetraacetic Acid ◽  
Neuroendocrine Cancers ◽  
Single Versus

Purpose Radiopeptide therapy is commonly performed with a single radioisotope. We aimed to compare the effectiveness of somatostatin-based radiopeptide therapy with a single versus a combination of radioisotopes. Patients and Methods In a cohort study, patients with metastasized neuroendocrine cancer were treated with repeated cycles of 90yttrium-labeled tetraazacyclododecane-tetraacetic acid modified Tyr-octreotide ([90Y-DOTA]-TOC) or with cycles alternating between [90Y-DOTA]-TOC and 177lutetium-labeled DOTA-TOC ([177Lu-DOTA]-TOC) until tumor progression or permanent toxicity. Multivariable Cox regression and competing risk regression were used to study predictors of survival and renal toxicity in patients completing three or more treatment cycles. Results A total of 486 patients completed three or more treatment cycles; 237 patients received [90Y-DOTA]-TOC and 249 patients received [90Y-DOTA]-TOC + [177Lu-DOTA]-TOC. Patients receiving [90Y-DOTA]-TOC + [177Lu-DOTA]-TOC had a significantly longer survival than patients receiving [90Y-DOTA]-TOC alone (5.51 v 3.96 years; hazard ratio, 0.64; 95% CI, 0.47 to 0.88; P = .006). The rates of severe hematologic toxicities (6.3% v 4.4%; P = .25) and severe renal toxicity (8.9% v 11.2%; P = .47) were comparable in both groups. Conclusion [90Y-DOTA]-TOC + [177Lu-DOTA]-TOC was associated with improved overall survival compared with [90Y-DOTA]-TOC alone in patients completing three or more cycles of treatment. Contrary to the current practice in radiopeptide therapy, our results suggest an advantage of using a combination of radioisotopes.

Novel Cell Nucleus Directed Fluorescent Tetraazacyclododecane-Tetraacetic Acid Compounds

2009 ◽  
Vol 5 (1) ◽  
pp. 93-102 ◽  
Author(s):  
A. Sturzu ◽  
U. Klose ◽  
H. Echner ◽  
M. Regenbogen ◽  
H. Kalbacher ◽  
...  
Keyword(s):  
Cell Nucleus ◽  
Tetraacetic Acid ◽  
Tetraazacyclododecane Tetraacetic Acid

A web-like network of type vi collagen in human skin is revealed by immuno-electron microscopy

1988 ◽  
Vol 46 ◽  
pp. 382-383
Author(s):  
Douglas R. Keene ◽  
Robert W. Glanville ◽  
Eva Engvall
Keyword(s):  
Electron Microscopy ◽  
Monoclonal Antibody ◽  
Human Skin ◽  
Basement Membranes ◽  
Primary Antibody ◽  
Fat Cells ◽  
Secondary Antibody ◽  
Type Vi Collagen ◽  
Dermal Matrix ◽  
Immuno Electron Microscopy

A mouse monoclonal antibody (5C6) prepared against human type VI collagen (1) has been used in this study to immunolocalize type VI collagen in human skin. The enbloc method used involves exposing whole tissue pieces to primary antibody and 5 nm gold conjugated secondary antibody before fixation, and has been described in detail elsewhere (2).Biopsies were taken from individuals ranging in age from neonate to 65 years old. By immuno-electron microscopy, type VI collagen is found to be distributed as a fine branching network closely associated with (but not attached to) banded collagen fibrils containing types I and III collagen (Fig. 1). It appears to enwrap fibers, to weave between individual fibrils within a fiber, and to span the distance separating fibers, creating a “web-like network” which entraps fibers within deep papillary and reticular dermal layers (Fig. 2). Relative to that in the dermal matrix, the concentration of type VI collagen is higher around endothelial basement membranes limiting the outer boundaries of nerves, capillaries, and fat cells (Fig. 3).

High-voltage electron microscopy of subretinal scar formation

1992 ◽  
Vol 50 (1) ◽  
pp. 486-487
Author(s):  
G.E. Korte ◽  
M. Marko ◽  
G. Hageman
Keyword(s):  
Electron Microscopy ◽  
Monoclonal Antibody ◽  
Retinal Pigment Epithelium ◽  
Glial Cells ◽  
High Voltage ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Sodium Iodate ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron

Sodium iodate iv. damages the retinal pigment epithelium (RPE) in rabbits. Where RPE does not regenerate (e.g., 1,2) Muller glial cells (MC) forma subretinal scar that replaces RPE. The MC response was studied by HVEM in 3D computer reconstructions of serial thick sections, made using the STEREC0N program (3), and the HVEM at the NYS Dept. of Health in Albany, NY. Tissue was processed for HVEM or immunofluorescence localization of a monoclonal antibody recognizing MG microvilli (4).

Identification of the pulmonary syndrome hantavirus by direct and colloidal gold immune Electron Microscopy

1994 ◽  
Vol 52 ◽  
pp. 274-275
Author(s):  
C. D. Humphrey ◽  
C.S. Goldsmith ◽  
L. Elliott ◽  
S.R. Zaki
Keyword(s):  
Electron Microscopy ◽  
United States ◽  
Monoclonal Antibody ◽  
Colloidal Gold ◽  
Phosphotungstic Acid ◽  
Uranyl Acetate ◽  
Hantavirus Pulmonary Syndrome ◽  
Deer Mice ◽  
Immune Electron Microscopy ◽  
Negative Stain

An outbreak of unexplained acute pulmonary syndrome with high fatality was recognized in the spring of 1993 in the southwestern United States. The cause of the illness was quickly identified serologically and genetically as a hantavirus and the disease was named hantavirus pulmonary syndrome (HPS). Recently, the virus was isolated from deer mice which had been trapped near the homes of HPS patients, and cultivated in Vero E6 cells. We identified the cultivated virus by negative-stain direct and colloidal gold immune electron microscopy (EM).Virus was extracted, clarified, and concentrated from unfixed and 0.25% glutaraldehyde fixed supernatant fluids of infected Vero E6 cells by a procedure described previously. Concentrated virus suspensions tested by direct EM were applied to glow-discharge treated formvar-carbon filmed grids, blotted, and stained with 0.5% uranyl acetate (UA) or with 2% phosphotungstic acid (PTA) pH 6.5. Virus suspensions for immune colloidal gold identification were adsorbed similarly to filmed grids but incubated for 1 hr on drops of 1:50 diluted monoclonal antibody to Prospect Hill virus nucleoprotein or with 1:50 diluted sera from HPS virus infected deer mice.

IgE and monoclonal antibody binding by the mite allergen Der p 7

1996 ◽  
Vol 26 (3) ◽  
pp. 308-315 ◽  
Author(s):  
H.-D. SHEN ◽  
K. Y. CHUA ◽  
W. L. LIN ◽  
H. L. CHEN ◽  
K.-H. HSIEH ◽  
...  
Keyword(s):  
Monoclonal Antibody ◽  
Mite Allergen ◽  
Antibody Binding ◽  
Monoclonal Antibody Binding

Quantification in mass units of Bet v 1, the main allergen of Betula verrucosa pollen, by a monoclonal antibody based-ELISA

1997 ◽  
Vol 27 (8) ◽  
pp. 926-931 ◽  
Author(s):  
J. RAMiREZ ◽  
J. A. CARPIZO ◽  
H. IPSEN ◽  
J. CARREIRA ◽  
M. LOMBARDERO
Keyword(s):  
Monoclonal Antibody ◽  
Bet V 1 ◽  
Betula Verrucosa

419: Growth of the Prostate Cancer Xenograft Lncap-IL-6+ is Inhibited by an Anti-Interleukin-6 Monoclonal Antibody

2005 ◽  
Vol 173 (4S) ◽  
pp. 114-114
Author(s):  
Hannes Steiner ◽  
Ilaria T.R. Cavarretta ◽  
Andreas P. Berger ◽  
Jasmin Bektic ◽  
Marian Nakada ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Monoclonal Antibody ◽  
Interleukin 6
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