Collagenase in animal experiments: a commonly used tool for gently dissociating tissue and obtaining single cells

What is collagenase? Why is it indispensable in animal experiments?

In animal experiments, many studies require the isolation of single cells from tissues such as liver, fat, tumor, or heart for subsequent culture, flow cytometry analysis, or single-cell sequencing. In addition to cells, tissues contain a large amount of "scaffolding" composed of collagen, which anchors cells in specific positions. Collagenase acts like a "biological scissors" specifically designed to cut through the collagen network, breaking apart the scaffold and releasing cells while preserving the cell membrane and surface markers as much as possible. Compared with harsher mechanical grinding, collagenase treatment is generally gentler, making it a commonly used reagent in many animal tissue dissociation experiments.

Common applications of collagenase in animal tissue dissociation

Different types of animal tissues have different requirements for collagenase. Liver tissue commonly uses collagenase-containing perfusion solution for digestion to obtain hepatocytes; adipose tissue requires collagenase to help release adipocytes and stromal vascular fraction; tumor tissue, due to its dense structure, is often used in combination with DNase and hyaluronidase to reduce cell adhesion and improve single-cell yield. In experiments, collagenase products with different activity ranges are generally selected based on tissue type, animal species, and downstream experimental purposes.

How to understand the "gentleness" and "efficiency" of collagenase

Collagenase is not a single component but a class of enzymes capable of degrading native collagen. Collagenase products commonly used in animal experiment reagents often contain multiple protease activities, and this mixed characteristic helps address the complex extracellular matrix in tissues. For ordinary users, it is not necessary to overly focus on purity numbers; the key is to follow laboratory-validated operating procedures and control concentration, temperature, and digestion time well. Too short a digestion time may result in insufficient cell release, while too long a time may damage cell viability. It is recommended to perform a preliminary test with a small amount of tissue before the formal experiment and adjust parameters according to cell status under the microscope.

What should be noted when using collagenase

Collagenase usually needs to be dissolved in a specific buffer and prepared fresh before use to avoid repeated freeze-thaw cycles affecting activity. Operations should be performed in a biosafety cabinet or clean bench to reduce contamination. After digestion is complete, terminate the reaction promptly with serum-containing medium, and remove undigested tissue blocks and debris by centrifugation and filtration. For animal experiments, different batches of reagents may have activity differences, and recording lot numbers and digestion effects helps ensure reproducible results. In summary, collagenase is an important biological reagent for animal experiments, and understanding its mechanism of action and key operating points can help researchers obtain ideal single-cell suspensions more consistently.