title: Quantitation of SPLUNC1 in saliva with an xMAP particle-based antibody capture and detection immunoassay.
abstract: The short palate lung and nasal epithelial clone 1 (SPLUNC1) protein may be differentially expressed in oral infections, oral inflammatory disorders, or oral malignancies and may be involved in innate immune responses in the oral cavity. However, the actual concentration of SPLUNC1 in saliva has not previously been determined. In this study, we determined the concentrations of SPLUNC1 in saliva using a particle-based antibody capture and detection immunoassay. A commercial goat anti-rhSPLUNC1 polyclonal antibody (AF1897) was linked to fluorescent polystyrene microspheres and used as the capture antibody. A commercial mouse IgG2b anti-rhSPLUNC1 monoclonal antibody (MAB1897) was biotinylated and used as the detection antibody. Western blot and 2-dimensional fluorescence difference gel electrophoresis (2-D DIGE) analysis of immunoprecipitated rhSPLUNC1 and SPLUNC1 from saliva were used to show that the capture AF1897 and detection MAB1897 antibodies both recognized SPLUNC1. Protein concentrations in saliva from 20 subjects ranged from 0.9 to 23.9mg/ml; SPLUNC1 concentrations ranged from 34.7ng/ml to 13.8μg/ml; and SPLUNC concentrations normalized per mg of total salivary protein ranged from 4.7ng/ml to 5.3μg/ml. These results show that SPLUNC1 is detected in saliva in a variety of concentrations. This immunoassay may prove to be useful in determining the concentration of SPLUNC1 in saliva for assessing its role in the pathogenesis of oral infections, oral inflammatory disorders, or oral malignancies.
authors.affiliation: Dows Institute for Dental Research, College of Dentistry, The University of Iowa, Iowa City, IA 52242, USA. karl-kohlgraf@uiowa.edu
authors.forename: Karl G
authors.initials: KG
authors.lastname: Kohlgraf
authors.forename: Abbey R
authors.initials: AR
authors.lastname: Ackermann
authors.forename: Kindra K
authors.initials: KK
authors.lastname: Burnell
authors.forename: Rupasree N
authors.initials: RN
authors.lastname: Srikantha
authors.forename: Sophie A
authors.initials: SA
authors.lastname: Joly
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Bartlett
authors.forename: Lokesh
authors.initials: L
authors.lastname: Gakhar
authors.forename: Georgia K
authors.initials: GK
authors.lastname: Johnson
authors.forename: Paul B
authors.initials: PB
authors.lastname: McCray
authors.forename: Janet M
authors.initials: JM
authors.lastname: Guthmiller
authors.forename: Kim A
authors.initials: KA
authors.lastname: Brogden
mesh_terms: D000328:Adult; D015153:Blotting, Western; D002478:Cells, Cultured; D015180:Electrophoresis, Gel, Two-Dimensional; D004847:Epithelial Cells / Q000276:immunology*; D005260:Female; D005883:Gingival Crevicular Fluid / Q000276:immunology*; D006023:Glycoproteins / Q000276:immunology*; D006801:Humans; D007118:Immunoassay / Q000379:methods*; D007158:Immunologic Techniques; D008297:Male; D008875:Middle Aged; D009055:Mouth / Q000276:immunology*; D010750:Phosphoproteins / Q000276:immunology*; D012137:Respiratory System / Q000276:immunology*; D012463:Saliva / Q000276:immunology* / Q000378:metabolism
chemical_list: C485599:BPIFA1 protein, human; D006023:Glycoproteins; D010750:Phosphoproteins