Sample preparation method for isolation of single-cell types from mouse liver for proteomic studies

Area of Science:

• Proteomics
• Cell Biology
• Liver Biology

Background:

• Accurate protein profiling in biological systems requires pure cell populations.
• Existing methods lack the ability to simultaneously isolate multiple distinct liver cell types with high purity and yield.

Purpose of the Study:

• To develop and validate a novel method for the simultaneous isolation of hepatocytes (HCs), hepatic stellate cells (HSCs), Kupffer cells (KCs), and liver sinusoidal endothelial cells (LSECs).
• To enable high-purity, high-yield proteome analysis of individual liver cell populations.

Main Methods:

• A combination of collagenase-based density gradient centrifugation and magnetic activated cell sorting was employed.
• Cell purity and viability were assessed using specific cell markers and viability assays.

Main Results:

• Simultaneous isolation of HCs, HSCs, KCs, and LSECs achieved high purity (>91%) and viability (>91%) for all cell types.
• Yields per mouse were: HCs (6.3 million), HSCs (1.3 million), LSECs (2.6 million), and KCs (5.0 million).
• Specific markers confirmed high purity: cytokeratin 18 for HCs (>98%), glial fibrillary acidic protein for HSCs (~97%), F4/80 for KCs (~98%), and high purity for LSECs (~91%).

Conclusions:

• This systematic isolation method provides pure and high-yield populations of major liver cell types for the first time.
• The technique is crucial for advancing proteomic analysis of distinct liver cell populations.
• This method is particularly valuable for sample preparation in projects like the Human Liver Proteome Project.