A novel and simple cell-based detection system with a collagen-encapsulated B-lymphocyte cell line as a biosensor for rapid detection of pathogens and toxins.
Cell-based biosensors (CBBs) are becoming important tools for biosecurity applications and rapid diagnostics in food microbiology for their unique capability of detecting physiologically hazardous materials. A multi-well plate-based biosensor containing B-cell hybridoma, Ped-2E9, encapsulated in type I collagen matrix, was developed for rapid detection of viable cells of pathogenic Listeria, the toxin listeriolysin O, and the enterotoxin from Bacillus species. This sensor measures the alkaline phosphatase release from infected Ped-2E9 cells colorimetrically. Pathogenic L. monocytogenes cells and toxin preparations from L. monocytogenes or B. cereus showed cytotoxicity ranging from 24 to 98% at 3-6 h postinfection. In contrast, nonpathogenic L. innocua (F4247) and B. subtilis induced minimal cytotoxicity, ranging only 0.4-7.6%. Laser scanning cytometry and cryo-nano scanning electron microscopy confirmed the live or dead status of the infected Ped-2E9 cells in gel matrix. This paper presents the first example of a cell-based sensing system using collagen-encapsulated mammalian cells for rapid detection of pathogenic bacteria or toxin, and demonstrates a potential for onsite use as a portable detection system.
Molecular Food Microbiology Laboratory, Department of Food Science, Purdue University, West Lafayette, IN 47907, USA.
Pratik
P
Banerjee
Dominik
D
Lenz
Joseph Paul
JP
Robinson
Jenna L
JL
Rickus
Arun K
AK
Bhunia
D000469:Alkaline Phosphatase / Q000032:analysis; D000818:Animals; D001402:B-Lymphocytes / Q000201:enzymology*; D001407:Bacillus / Q000302:isolation & purification*; D001427:Bacterial Toxins / Q000032:analysis* / Q000494:pharmacology; D001681:Biological Assay; D015374:Biosensing Techniques; D016923:Cell Death / Q000187:drug effects; D002460:Cell Line; D002462:Cell Membrane / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D003094:Collagen / Q000494:pharmacology; D047569:Laser Scanning Cytometry; D008087:Listeria / Q000302:isolation & purification*; D051379:Mice; D008855:Microscopy, Electron, Scanning
D001427:Bacterial Toxins; D003094:Collagen; D000469:Alkaline Phosphatase