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SLAS Discov. 2019 Feb;24(2):190-198. doi: 10.1177/2472555218804990. Epub 2018 Oct 10.

Development of a Bacterial Macroarray for the Rapid Screening of Targeted Antibody-Secreted Hybridomas.

Author information

1
1 School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, PR China.
2
2 Lanzhou University Second Hospital, Lanzhou, China.
3
3 Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, PR China.

Abstract

Hybridoma screening is a key step for the successful generation of high-affinity analyte-specific monoclonal antibodies (MAbs). This work presents an innovative screening method, known as a bacterial macroarray, generated by contact printing of hybridoma cell supernatant samples on a nitrocellulose (NC) membrane initially coated with fluorescein isothiocyanate (FITC)-labeled bacteria. Given that bacterial fixation will be influenced by complex bacterial surface structures, we selected both gram-positive bacteria ( Staphylococcus aureus and Listeria monocytogenes) and gram-negative bacteria ( Escherichia coli O157:H7 and Cronobacter sakazakii) to optimize the fixation conditions for binding to the NC membrane, such as the aperture of the NC membrane, the concentration of bacteria, the dosage of glycerin in the spotting buffer, and the fixation time and temperature. As a result, we found that a better bacterial macroarray could be developed when the spotting buffer, containing 1011 CFU mL-1 of FITC-labeled bacteria and 15% (V/V) glycerol, was spotted onto a 0.45 µm NC membrane with an incubation of 2 h at 37 °C. Finally, we verified the stability and specificity of the prepared bacterial macroarray by detecting cell cultures with the addition of two MAbs ( Escherichia coli O157:H7 MAb E7 and Cronobacter sakazakii MAb 1E9) to simulate the screening experiments. Here, we describe a bacterial macroarray to efficiently screen the targeted antibody-secreted hybridomas.

KEYWORDS:

MAbs; antibody-secreted hybridoma; bacterial macroarray; optimization

PMID:
30304643
DOI:
10.1177/2472555218804990

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