Analysis of human brain tissue derived from DBS surgery

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• Obtaining fresh human brain tissue for molecular analysis is challenging due to sample availability and postmortem degradation.
• Postmortem brain samples may not accurately reflect the in vivo state, especially in advanced disease stages.
• Deep brain stimulation (DBS) surgery offers a unique opportunity to access metabolically intact brain tissue from living patients.

Purpose of the Study:

• To develop and validate an improved method for collecting fresh human brain tissue from surgical instruments used in DBS procedures.
• To enable transcriptomic and proteomic analyses on these fresh tissue samples.
• To overcome the limitations associated with using postmortem brain tissue.

Main Methods:

• Brain tissue samples were collected from guide tubes and recording electrodes during routine DBS implantation surgery.
• RNA sequencing was performed on tissues from microelectrodes to analyze gene expression.
• Liquid chromatography-mass spectrometry (LC-MS) was used to identify proteins in tissues from guide tubes.

Main Results:

• Detected 32,034 RNA transcripts and identified 734 unique proteins from multiple patients and brain hemispheres.
• Established the robustness and reproducibility of the protocol by comparing results with existing datasets.
• Demonstrated that surgical instruments retain sufficient brain material for comprehensive molecular studies.

Conclusions:

• Surgical instruments from DBS procedures provide a valuable source of fresh brain tissue from living patients.
• This approach circumvents issues related to postmortem interval and sample degradation.
• The method facilitates molecular studies of DBS-treatable neurological conditions, such as Parkinson's disease.