Accessing microenvironment compartments in formalin-fixed paraffin-embedded tissues by protein expression analysis.

Area of Science:

• Biochemistry
• Proteomics
• Biotechnology

Background:

• Formalin-fixed paraffin-embedded (FFPE) samples are valuable for studying disease progression.
• Recent research focuses on FFPE samples for novel biomarker discovery and disease feature identification.

Purpose of the Study:

• To develop an efficient workflow for clinical protein expression studies using minimal biological material from FFPE samples.
• To optimize and validate a method for reproducible proteomic analysis of FFPE tissues.

Main Methods:

• Developed a workflow combining filter-assisted sample preparation (FASP) with mass spectrometry (MS) and label-free quantification.
• Investigated xenograft lung tumor tissue as a model system.
• Modified the FASP protocol to enhance reproducibility and hydrophobic protein analysis.

Main Results:

• The workflow demonstrated improved reproducibility and qualitative/quantitative performance.
• A modified FASP protocol was proposed, enhancing the analysis of hydrophobic proteins.
• The method was successfully applied to lung cancer xenograft tissue.

Conclusions:

• The presented workflow enables efficient analysis of FFPE samples, reducing analytical time and improving performance.
• This approach is suitable for proteomic investigations of FFPE tissues, including lung cancer models.