The minor salivary gland proteome in Sjögren's syndrome.
OBJECTIVE
To identify the global protein expression (the proteome) in the minor salivary glands from primary Sjögren's syndrome (pSS) patients and non-SS controls.


METHODS
Minor labial salivary glands were obtained from six pSS patients and from six age-matched non-SS controls, lysed in SDS buffer and pooled into two groups, respectively. The lysates were analysed by liquid chromatography electrospray ionization combined with tandem mass spectrometry. Also, the proteins were separated by two-dimensional polyacrylamide gel electrophoresis and protein spots were subjected to mass spectrometry.


RESULTS
Heat shock proteins, mucins, carbonic anhydrases, enolase, vimentin and cyclophilin B were among the proteins identified. The differences in the proteomes of minor salivary glands from pSS patients and non-SS controls were mainly related to ribosomal proteins, immunity and stress. Alpha-defensin-1 and calmodulin were among six proteins exclusively identified in pSS patients.


CONCLUSIONS
We have identified several minor salivary gland proteins that may have implications for clarifying the SS pathophysiology. This experiment adds to the knowledge of proteins produced in salivary glands in health and disease, and may form the basis of further studies on biomarkers of prognostic and diagnostic value.
Department of Clinical Dentistry - Periodontics, University of Bergen, Bergen, Norway.
T O R
TO
Hjelmervik
R
R
Jonsson
A I
AI
Bolstad
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000032:analysis; D015153:Blotting, Western; D002147:Calmodulin / Q000032:analysis; D002256:Carbonic Anhydrases / Q000032:analysis; D016022:Case-Control Studies; D021983:Cyclophilins / Q000032:analysis; D015180:Electrophoresis, Gel, Two-Dimensional; D005260:Female; D006360:Heat-Shock Proteins / Q000032:analysis; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D009077:Mucins / Q000032:analysis; D010751:Phosphopyruvate Hydratase / Q000032:analysis; D020543:Proteome / Q000032:analysis*; D012269:Ribosomal Proteins / Q000032:analysis; D012470:Salivary Glands, Minor / Q000473:pathology*; D012471:Salivary Proteins and Peptides / Q000032:analysis*; D012859:Sjogren's Syndrome / Q000473:pathology*; D021241:Spectrometry, Mass, Electrospray Ionization; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D053719:Tandem Mass Spectrometry; D014746:Vimentin / Q000032:analysis; D023084:alpha-Defensins / Q000032:analysis
D015415:Biomarkers; D002147:Calmodulin; D006360:Heat-Shock Proteins; D009077:Mucins; D020543:Proteome; D012269:Ribosomal Proteins; D012471:Salivary Proteins and Peptides; D014746:Vimentin; D023084:alpha-Defensins; C406413:human neutrophil peptide 1; C081786:cyclophilin B; D002256:Carbonic Anhydrases; D010751:Phosphopyruvate Hydratase; D021983:Cyclophilins