title: Production of monoclonal antibody and application in indirect competitive ELISA for detecting okadaic acid and dinophytoxin-1 in seafood.
abstract: OBJECTIVE
  Okadaic acid (OA) and analogues of dinophysistoxin (DTX) are key diarrheic shellfish poisoning (DSP) toxins, which possibly arouse DSP symptoms by consuming the contaminated shellfish. Because of the stable toxicity in high temperature and the long-term carcinogenicity, the outbreaks of DSP related to consumption of bivalve mollusks contaminated by DSP toxins pose a hazard to public health. Therefore, it is worth developing a fast and reliable analytical method for the detection of OA and analogues in shellfish. In this paper, an indirect competitive enzyme-linked immunosorbent assay (ELISA) (icELISA) for detecting OA and DTX-1 in seafood was developed based on monoclonal antibody (McAb).
  
  
  METHODS
  The OA was conjugated to human immunoglobulin G (IgG) and bovine serum albumin (BSA) by the active ester method as the immune antigen and the detective antigen. The spleen cells from BALB/c mice immunized with OA-IgG were fused with SP2/0 myeloma cells. A hybridoma cell line, which secreted McAb against OA, was selected by "limiting dilution" cloning. An icELISA was developed based on immobilized conjugate (OA-BSA) competing the McAb with the free OA in seafood sample.
  
  
  RESULTS
  A hybridoma cell line, which secreted IgG1 subclass monoclonal antibody (McAb) against OA, was selected. The IC(50) of the McAb for OA and dinophytoxin-1 (DTX-1) were 4.40 and 3.89 ng/mL, respectively. Based on the McAb, an indirect competitive ELISA for detection of OA and DTX-1 in seafood was developed. The regression equation was y = 54.713x - 25.879 with a coefficient correlation of R                            (2) = 0.9729. The linear range and the limit of detection were 0.4-12.5 and 0.45 ng/mL, respectively. The average recovery of OA and DTX-1 spiked shellfish was 82.29% with the coefficient of variation of 7.67%.
  
  
  CONCLUSIONS
  The developed icELISA is a fast, sensitive, and convenient assay for detecting of total amount of OA and DTX-1 in seafood.
authors: Key Laboratory for Zoonosis Research, Ministry of Education, Institute of Zoonosis, Jilin University, Changchun, 130062, People's Republic of China. lushiying1129@163.com
authors: Shi-Ying
authors: SY
authors: Lu
authors: Yu
authors: Y
authors: Zhou
authors: Yan-Song
authors: YS
authors: Li
authors: Chao
authors: C
authors: Lin
authors: Xian-Mei
authors: XM
authors: Meng
authors: Dong-Ming
authors: DM
authors: Yan
authors: Zhao-Hui
authors: ZH
authors: Li
authors: Shi-Yu
authors: SY
authors: Yu
authors: Zeng-Shan
authors: ZS
authors: Liu
authors: Hong-Lin
authors: HL
authors: Ren
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D002460:Cell Line; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D005504:Food Analysis / Q000379:methods; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D019319:Okadaic Acid / Q000737:chemistry* / Q000031:analogs & derivatives; D011485:Protein Binding; D011714:Pyrans / Q000737:chemistry*; D017747:Seafood / Q000032:analysis*; D012710:Serum Albumin, Bovine; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D000911:Antibodies, Monoclonal; D011714:Pyrans; D014874:Water Pollutants, Chemical; D019319:Okadaic Acid; D012710:Serum Albumin, Bovine; C051904:dinophysistoxin 1