Development of a sandwich enzyme linked immunosorbent assay (ELISA) for the quantification of iduronate-2-sulfate sulfatase

• Published in: Journal of immunological methods 2011-05, Vol.368 (1-2), p.64-70
• Main Authors: Sosa, Angela Catalina, Espejo, Angela Johana, Rodriguez, Edwin Alexander, Lizaraso, Lina Maria, Rojas, Andrea, Guevara, Johana, Echeverri, Olga Yaneth, Barrera, Luis Alejandro
• Format: Article
• Language: English
• Subjects: amino acid sequences; Animals; antigens; arylsulfatase; Biological and medical sciences; Blotting, Western; Chickens; enzyme activity; Enzyme replacement therapy; enzyme-linked immunosorbent assay; Enzyme-Linked Immunosorbent Assay - methods; Female; Fundamental and applied biological sciences. Psychology; Fundamental immunology; Humans; Hunter; IDS; Iduronate Sulfatase - analysis; IgY polyclonal antibodies; immunoglobulin G; Immunoglobulin G - chemistry; Immunoglobulin G - immunology; immunoglobulin Y; Immunoglobulins - chemistry; Immunoglobulins - immunology; Molecular immunology; monitoring; monoclonal antibodies; Mucopolysaccharidosis; Mucopolysaccharidosis II - diagnosis; Mucopolysaccharidosis II - enzymology; Pichia pastoris; purification methods; Rabbits; recombinant proteins; Recombinant Proteins - analysis; Sandwich ELISA; Techniques
• ISSN: 0022-1759; 1872-7905
• DOI: 10.1016/j.jim.2011.03.004

Iduronate-2-sulfate sulfatase (IDS; EC 3.1.6.13) is an enzyme that belongs to human sulfatases. IDS deficiency causes the Hunter syndrome or mucopolysaccharidosis type II (MPS II; OMIM 309900). We have been developing an expression system for human recombinant IDS (hrIDS) in Pichia pastoris, therefore a method was required for its detection during production and purification processes, which could be used also to measure the enzyme in human fluids. In this study, an immunoquantification assay for human and recombinant IDS was developed with the combination of two antibodies. Rabbit IgG and chicken IgY were used as IDS capture and detection antibodies, respectively. Chicken IgY antibodies were developed against specific amino acid sequences present in IDS but absent in other human sulfatases. hrIDS produced in P. pastoris, commercial hrIDS, and normal human plasma samples were used as antigens and immunoquantification results were compared to enzyme activity. The technique was linear over the range 8 to 500ngmL−1 using commercial hrIDS. The concentration range detected for IDS in normal human plasma was 14.43 to 287.88ngmL−1. The hrIDS was detected in P. pastoris cultures even when the enzyme was inactive, which is convenient for monitoring the production of recombinant proteins. These results show that chicken site-specific antibodies provide a good alternative, as a substitute of monoclonal antibodies, for the detection of human proteins. This is the first report on the development of an ELISA system to detect and quantify IDS with IgY antibodies.