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Huigg

Manufactured by MP Biomedicals
Sourced in United States

HuIgG is a purified human immunoglobulin G (IgG) product. IgG is the most abundant type of antibody in the human body and plays a crucial role in the immune system's response to pathogens and other foreign substances.

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2 protocols using huigg

1

Radiolabeling of Trastuzumab Immunoconjugate

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The bifunctional acyclic CHX-A″-DTPA chelating agent was conjugated to trastuzumab using established methods (10-fold molar excess of ligand to trastuzumab reaction ratio) as previously reported [4 (link),40 (link)]. The concentration of the protein of the immunoconjugate was determined (Lowry) and the average number of chelates per mAb assayed by a literature spectrophotometric method [41 (link),42 (link)]. Lutetium-177 (110 mCi) (PerkinElmer, Shelton, CT, USA), dissolved in 100 µL of 0.1 N HCl, was adjusted to pH 5.5 (5 M NH4OAc buffer (pH 5.5)). The CHX-A″-trastuzumab immunoconjugate (2.0 mg) in 0.15 M NH4OAc buffer (pH 6.5–7.0) was added to the buffered 177Lu. After incubation (1 h, 37 °C), the radiolabeling reaction was halted with 0.1 M EDTA (4 µL, pH 6.0). Purification of the radioimmunoconjugate (RIC) was then affected by use of a PD-10 desalting column (GE Healthcare, Piscataway, NJ, USA). The non-specific control antibody for these experiments was prepared from HuIgG (MP Biomedicals, Santa Ana, CA, USA) using the identical conditions described for the specific agent.
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2

Conjugation of Monoclonal Antibodies to Chelators

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Trastuzumab (Herceptin; Genetech, Inc., South San Francisco, CA) and panitumumab (Vectibix, Amgen, Thousand Oaks, CA) were purchased through the National Institutes of Health (NIH), Division of Veterinary Resources Pharmacy. Polyclonal human immunoglobulin (HuIgG; MP Biochemicals), purified from human serum, has no known antigen with which it reacts. HuM195, an anti-CD33 antibody, was kindly provided by Dr. McDevitt at the Memorial Sloan-Kettering Cancer Center.
Conjugation of monoclonal antibodies (mAb) with the bifunctional ligands, 1, 4, 7, 10-tetraazacyclododecane-N, N,N,N‴-tetraacetic acid (DOTA) or with trans-cyclohexyl-diethylenetriamine-pentaacetic acid (CHX-A″), was performed at a 10-fold molar excess of ligand to mAb according to established methods.26 (link)–32 (link) The final protein concentrations were determined by the Lowry method using a BSA standard.33 (link) The number of DOTA and CHX-A″ molecules bound to mAb were quantitated using spectrophotometric assays based on the titration of lead-Arsenazo(III) and yttrium- Arsenazo(III) complex, respectively. 34 (link), 35 (link) The final chelate:protein ratios range from 2.6 to 4.0. HuIgG, or HuM195 similarly conjugated, served as negative controls in these studies.
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