# Benchmarking Lysosome Enrichment Methods: A Guide for Research and Clinical Translation

## TL;DR

This paper compares different methods for isolating lysosomes to help researchers choose the best one for their needs.

## Contribution

The study provides a systematic, multimodal benchmark of lysosome enrichment techniques using a monocytic cell line.

## Key findings

- Gradient-based and bead-based methods offer the highest lysosomal enrichment and proteomic purity.
- Subcellular fractionation yields more lysosomes but with higher variability and contamination.
- Filter-based methods are fast but result in nonintact lysosomes with significant cross-contamination.

## Abstract

Lysosomes, essential organelles involved in diverse cellular
processes,
are increasingly recognized as central players in the pathogenesis
of numerous diseases. Due to their low abundance in whole-cell extracts,
enrichment strategies are required for downstream analyses such as
proteomics. Despite the availability of various lysosome isolation
methods, including density gradient-based separation, filter-based
approaches, magnetic bead-based isolation, and subcellular fractionation,
a systematic, multimodal comparison of their performance is lacking.
Here, four widely used lysosome enrichment techniques are benchmarked
using the THP-1 monocytic cell line as a model. Each method has been
evaluated for yield, purity, membrane integrity, reproducibility,
scalability, and cross-contamination, employing nanoparticle tracking
analysis, electron microscopy, flow cytometry, Western blotting, and
mass spectrometry-based proteomics. Data reveal substantial differences:
gradient-based and bead-based methods provide the highest lysosomal
enrichment and proteomic purity, whereas the subcellular fractionation
approach yields greater numbers of lysosomes but with increased variability
and contamination. Finally, the filter-based method enables rapid
processing, but mainly nonintact lysosomes are obtained with significant
cross-contamination. These findings provide practical guidance for
selecting the appropriate lysosome enrichment strategy, tailored to
specific research or clinical objectives. The results also emphasize
the need for rigorous validation to ensure the robustness of lysosomal
studies in both basic and clinical research settings.