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Strategies for Monitoring Serum Protein Degradation With an Antibody Array-Based Technology.

Yanlin Wang1,2,3, Min Lang4, Wei Huang2

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Human serum proteins degrade rapidly at room temperature, compromising biomarker integrity. Antibody arrays can detect this degradation, identifying proteins like interleukins and growth factors as indicators of sample quality.

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antibody arraybiomarkerslinear regressionprotein degradationserum

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Area of Science:

  • Biochemistry
  • Proteomics
  • Biomarker Discovery

Background:

  • Human serum is crucial for disease biomarker discovery.
  • Proteolytic degradation during sample handling can affect biomarker accuracy.
  • Antibody array technology offers a potential solution for assessing protein stability.

Purpose of the Study:

  • To evaluate the feasibility of antibody array technology for assessing temporal serum protein stability at room temperature.
  • To identify serum proteins that degrade rapidly under ambient conditions.

Main Methods:

  • Monitoring concentrations of 480 serum proteins using antibody arrays.
  • Incubating samples from 10 healthy donors at 25°C for up to 48 hours.
  • Analyzing time-dependent concentration changes and correlating them with protein physicochemical properties.

Main Results:

  • 201 out of 480 proteins showed significant concentration decline over 48 hours.
  • 91 proteins degraded over 20% within the first 6 hours.
  • Degraded proteins were predominantly low molecular weight (<40 kDa) and involved in key signaling pathways (JAK-STAT, PI3K-Akt, MAPK).

Conclusions:

  • Antibody arrays are feasible for detecting serum protein degradation.
  • Clinical significance proteins, including interleukins, growth factors, and chemokines, degrade rapidly at room temperature.
  • These rapidly degrading proteins can serve as biomarkers for assessing human serum sample quality.