An immuno-polymerase chain reaction assay for human interleukin-18.
J Immunol Methods
; 238(1-2): 173-80, 2000 Apr 21.
Article
em En
| MEDLINE
| ID: mdl-10758247
ABSTRACT
Conventional enzyme-linked immunosorbent assays (ELISA) are sufficient to measure normal and elevated serum interleukin (IL)-18 concentrations, but have limited sensitivity when measuring low concentrations of IL-18 such as in patients with the acquired immunodeficiency syndrome. We have developed a highly sensitive method for detecting human (h) IL-18 using an immuno-polymerase chain reaction (PCR). A mouse monoclonal anti-hIL-18 antibody and rabbit polyclonal anti-hIL-18 antibody was used for an indirect sandwich ELISA with a detection limit of 40 ng/l and a very low background. For immuno-PCR, biotinylated DNA was produced from the plasmid Bluescript by PCR amplification with biotinylated M13-20 primer and nonbiotinylated M13 reverse primer. Immuno-PCR for hIL-18 was performed for 40 cycles using 1 ng/l of biotinylated DNA. This immuno-PCR has a detection limit of 2.5 pg/l, 1.6x10(4) times lower than that of the ELISA. In addition, our system avoids sampling error caused by heat transfer from the ELISA plate to the PCR tube because all procedures from immobilization of the antibody to PCR amplification can be performed in the same tube. This immuno-PCR for hIL-18 is the most sensitive method for detecting hIL-18 reported to date.
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Bases de dados:
MEDLINE
Assunto principal:
Reação em Cadeia da Polimerase
/
Interleucina-18
Tipo de estudo:
Diagnostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
J Immunol Methods
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
Japão