Quantitative proteomics of parotid saliva in primary Sjögren's syndrome

Kiran S. Ambatipudi, Stephen Swatkoski, James J. Moresco, Patricia G. Tu, Andreea Coca, Jennifer H. Anolik, Marjan Gucek, Igñacio Sanz, John R. Yates, James E. Melvin

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


The diagnosis of primary Sjögren's syndrome (pSS) is difficult due to the lack of specific laboratory and clinical tests. As an initial step for the global discovery of changes in the abundance of parotid salivary proteins in pSS, a pooled sample was compared to that from healthy control subjects by multidimensional protein identification technology (MudPIT). A total of 1246 proteins were identified by MudPIT. The abundance of 477 of these proteins did not change, 529 were only detected in either the pSS or HC sample, while 206 of these proteins were significantly upregulated ≥ twofold and 34 were downregulated ≤ 0.5. Ingenuity Pathway Analyses of differentially expressed proteins identified by MudPIT resulted in the identification of 100 significant pathways. The same samples were quantified in parallel using RP MS. Fifty-eight of 71 proteins identified by RP overlapped with MudPIT results. Five proteins were further analyzed by targeted label-free quantification to confirm the similar relative differential expression observed by RP and MudPIT approaches. The present study supports the use of MS for global discovery and validation of marker proteins for improved and early diagnosis of pSS.

Original languageEnglish (US)
Pages (from-to)3113-3120
Number of pages8
Issue number19-20
StatePublished - Oct 2012
Externally publishedYes


  • Autoimmune
  • Biomarkers
  • Biomedicine
  • Label-free quantitation
  • Parotid saliva
  • Sjögren's syndrome

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology


Dive into the research topics of 'Quantitative proteomics of parotid saliva in primary Sjögren's syndrome'. Together they form a unique fingerprint.

Cite this