Multiplexed immunobead-based assay for detection of oral cancer protein biomarkers in saliva.
OBJECTIVE
For clinical applications of biomarkers, there is a need for multiplex assays using high throughput platforms. The objective of this study was to determine the efficacy of Luminex Multianalyte Profiling (xMAP) technology for measurement of salivary proteins and to evaluate whether multiplex assays are as effective as single-plex assays and enzyme-linked immunosorbent assay (ELISA).


RESULTS
The average levels of interleukin-8 (IL-8) from the single-plex assay were 3313.2 +/- 3759.8 pg ml(-1) [oral squamous cell carcinoma (OSCC), n = 20] and 1061.7 +/- 1978.8 pg ml(-1) (control, n = 20). The IL-1beta average levels from the single-plex assay were 945.2 +/- 1134.8 pg ml(-1) (OSCC, n = 20) and 314.2 +/- 444.8 pg ml(-1) (control, n = 20). The average levels of IL-8 from the multiplex assay were 2834.9 +/- 3385.6 pg ml(-1) (OSCC, n = 20) and 947.3 +/- 2036.8 pg ml(-1) (control, n = 20). The IL-1beta average levels from the multiplex assay were 1013.5 +/- 1221.1 pg ml(-1) (OSCC, n = 20) and 376.3 +/- 576.3 pg ml(-1) (control, n = 20). The correlation coefficient between Luminex and ELISA assay for IL-8 (n = 19) and IL-1beta (n = 19) was 0.91 and 0.84, respectively.


CONCLUSIONS
Luminex xMAP single-plex and multiplex assays are as effective as ELISA assays for quantification of proteins in saliva. Both IL-8 and IL-1beta were expressed at significantly higher levels in OSCC subjects than in the matched healthy control subjects.
Arellano-Garcia
M E
ME
School of Dentistry, Oral Biology and Medicine Division and Dental Research Institute, University of California Los Angeles, Los Angeles, CA, USA.
Hu
S
S
Wang
J
J
Henson
B
B
Zhou
H
H
Chia
D
D
Wong
D T
DT
D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis*; D002294:Carcinoma, Squamous Cell / Q000473:pathology; D016022:Case-Control Studies; D002863:Chromogenic Compounds; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry / Q000379:methods; D006801:Humans; D007118:Immunoassay / Q000379:methods; D053583:Interleukin-1beta / Q000032:analysis; D016209:Interleukin-8 / Q000032:analysis; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000473:pathology*; D009363:Neoplasm Proteins / Q000032:analysis*; D010518:Periodontitis / Q000473:pathology; D040081:Protein Array Analysis; D012463:Saliva / Q000737:chemistry*; D012471:Salivary Proteins and Peptides / Q000032:analysis*; D012680:Sensitivity and Specificity; D055815:Young Adult
D014408:Biomarkers, Tumor; D002863:Chromogenic Compounds; D053583:Interleukin-1beta; D016209:Interleukin-8; D009363:Neoplasm Proteins; D012471:Salivary Proteins and Peptides