Serum proteomic profiling of obese patients: correlation with liver pathology and evolution after bariatric surgery

V Trak-Smayra ¹, D Dargere , R Noun

⁰Centre de recherche Biomédical Bichat Beaujon, INSERM U773, Paris, France.

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April 12, 2008

View abstract on PubMed

Summary

Obese patients with liver damage show altered serum protein profiles. Free hemoglobin subunits may indicate the severity of liver disease in these individuals, offering a potential non-invasive biomarker.

Area Of Science

Proteomics
Biomarker Discovery
Obesity and Liver Disease

Background

Obesity is linked to chronic liver diseases like cirrhosis.
Steatosis and non-alcoholic steatohepatitis (NASH) are key risk factors for liver fibrosis progression.
Current diagnosis of steatosis and NASH requires invasive liver biopsy.

Purpose Of The Study

To identify novel serum biomarkers for steatosis and NASH in obese patients.
To utilize SELDI-TOF ProteinChip technology for proteomic analysis.
To correlate serum protein profiles with liver histology in obese individuals.

Main Methods

Selected 80 obese, non-alcoholic patients undergoing bariatric surgery.
Collected serum samples pre- and post-surgery.
Performed liver biopsy and analyzed serum protein profiles using SELDI-TOF ProteinChip technology.

Main Results

Identified three specific protein peaks (CM10-7558.4, CM10-7924.2, Q10-7926.9) with increased intensity correlating with liver lesion severity (steatosis and NASH).
Observed normalization of these peaks post-bariatric surgery.
Characterized these peaks as alpha- and beta-hemoglobin subunits.

Conclusions

Serum protein profiles differ based on liver lesion severity in obese patients.
Free hemoglobin subunits show potential as serum biomarkers for assessing liver damage severity.
This proteomic approach offers a non-invasive method for evaluating liver health in obese populations.

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