Characterization of the renal cyst fluid proteome in autosomal dominant polycystic kidney disease (ADPKD) patients

Xianyin Lai, Robert Bacallao, Bonnie L. Blazer-Yost, David Hong, Stephen B. Mason, Frank Witzmann

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Autosomal dominant polycystic kidney disease (ADPKD) is characterized by localized autonomous cellular proliferation, fluid accumulation within the cysts, and intraparenchymal fibrosis of the kidney. Little is known about the cyst fluid's protein composition. We hypothesized that the complex collection of cyst fluid proteins (cyst fluid proteome) plays a major role in cyst formation/maintenance and contains yet unknown diagnostic and mechanistic features that are common to all forms of PKD. We analyzed five kidney cyst fluids from four patients with ADPKD. Tryptic peptides from plasma-protein immunodepleted (ProteoPrep®) and undepleted cyst fluid samples were analyzed by LC-MS/MS. Proteins were identified by SEQUEST™ and validated via the Trans-Proteomic Pipeline; 391 proteins were identified with >90% confidence; 251 of them in undepleted and 362 in immunodepleted samples. Immunodepletion removed >94% of the cyst fluid protein. A surprisingly large and functionally diverse number of proteins common to most cysts were identified. These proteins may be of mechanistic interest and indude γ, κ, and fragments; complement components; vitronectin; orosomucoid; prostaglandin D2 synthase; vitamin D-binding protein; clusterin; SERPIN family proteins; hemopexin; and fetuin-A. Additionally, these results suggest that further prefractionation and enhanced chromatographic separation of tryptic peptides is likely to expose an even greater number of relevant proteins.

Original languageEnglish
Pages (from-to)1140-1152
Number of pages13
JournalProteomics - Clinical Applications
Volume2
Issue number7-8
DOIs
StatePublished - Jul 2008

Fingerprint

Cyst Fluid
Autosomal Dominant Polycystic Kidney
Proteome
Kidney
Fluids
Proteins
Cysts
prostaglandin R2 D-isomerase
alpha-2-HS-Glycoprotein
Hemopexin
Vitamin D-Binding Protein
Clusterin
Vitronectin
Orosomucoid
Peptides
Proteomics
Blood Proteins
Fibrosis
Pipelines
Maintenance

Keywords

  • Cyst fluid
  • Immunodepletion
  • Liquid chromatography
  • Mass spectrometry
  • Polycystic kidney disease

ASJC Scopus subject areas

  • Clinical Biochemistry

Cite this

Characterization of the renal cyst fluid proteome in autosomal dominant polycystic kidney disease (ADPKD) patients. / Lai, Xianyin; Bacallao, Robert; Blazer-Yost, Bonnie L.; Hong, David; Mason, Stephen B.; Witzmann, Frank.

In: Proteomics - Clinical Applications, Vol. 2, No. 7-8, 07.2008, p. 1140-1152.

Research output: Contribution to journalArticle

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