title: Immunological screening and characterization of highly specific monoclonal antibodies against 20 kDa hGH.
abstract: BACKGROUND
  hGH has been widely abused as a doping agent in sports for many years. There are some important approaches for the detection of hGH doping, and the ratio of 22:20 kDa GH was considered one of the most suitable detection indicators of GH abuse. Currently, effective anti-GH antibodies and related reagents are needed to develop a detection method, in particular, highly specific anti-20 kDa hGH monoclonal antibodies are a prerequisite. Herein we constructed the expression vector of 20 kDa hGH and prepared the corresponding antibodies by the immunization of the recombinant human 20 kDa into mice. Positive clones that can specifically recognize 20 kDa hGH were screened and characterized by enzyme immunoassay, Dot-ELISA and surface plasmon resonance. In total, 14 specific monoclonal cell lines were screened out.
  
  
  RESULTS
  By a series of characterization, it was found that the 6C8, 44H3, 12G7 and 33Y19 clones were showing much higher specificity and affinity to 20 kDa hGH, and P3H9 could recognize both 20 and 22 kDa hGH isoforms. 6C8 and 44H3 matched well with P3H9 in the surface plasmon resonance testing. The 12G7 clone had the best surface properties with an association constant of 3.4 × 10(9) M(-1) and a dissociation constant of 2.95 × 10(10) M.
  
  
  CONCLUSIONS
  Highly specific monoclonal antibodies against 20 kDa hGH were generated, and also two paired antibodies (P3H9 and 6C8 or P3H9 and 44H3) were characterized, which can serve as the potential components for 22:20 kDa detection kit.
authors.affiliation: Research Center for Bioengineering & Sensing Technology, University of Science & Technology Beijing, Beijing 100083, China.
authors.forename: Hongwu
authors.initials: H
authors.lastname: Du
authors.forename: Guangyu
authors.initials: G
authors.lastname: Chen
authors.forename: Shuang
authors.initials: S
authors.lastname: Wang
authors.forename: Shan
authors.initials: S
authors.lastname: Wang
authors.forename: Shaoxu
authors.initials: S
authors.lastname: Li
authors.forename: Chuanbao
authors.initials: C
authors.lastname: Li
authors.forename: Yiping
authors.initials: Y
authors.lastname: Xun
authors.forename: Chunji
authors.initials: C
authors.lastname: He
authors.forename: Moutian
authors.initials: M
authors.lastname: Wu
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000032:analysis* / Q000096:biosynthesis / Q000276:immunology*; D000918:Antibody Specificity; D003001:Cloning, Molecular; D003429:Cross Reactions; D005260:Female; D019382:Human Growth Hormone / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D010957:Plasmids / Q000235:genetics; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification
chemical_list: D000911:Antibodies, Monoclonal; D011994:Recombinant Proteins; D019382:Human Growth Hormone