Expert Insights | In Vivo Tumorigenesis Application and Operation of Luciferase Cell

Expert Insights | In Vivo Tumorigenesis Application and Operation of Luciferase Cell

Tumor research is a crucial branch in the biomedical field, and mouse tumor models provide a powerful tool for studying tumor growth, metastasis, and drug efficacy. However, traditional methods of tumor monitoring often require sacrificing experimental animals, which not only increases research costs but may also impact the accuracy of experimental results.

Luciferase Cell Lines have brought innovation to tumor research. These cells stably express luciferase, allowing real-time tracking of tumor progression through bioluminescence imaging. This non-invasive monitoring method reduces the need for animals and enables continuous monitoring of tumor growth dynamics. This article will explore the application and operation of luciferase cells in mouse tumor models.

Figure 1 Schematic diagram of the application process of Luciferase stable cells in in vivo

Before starting the experiment, it is necessary to prepare the cells and animals. But what kind of luciferase cells should be selected? Here is some information for your reference:

1.Research Purpose:

Human-derived tumor cell lines: Suitable for studying the mechanisms of human cancer and evaluating anti-cancer drug efficacy.

Mouse-derived tumor cell lines: Suitable for studying the interactions between tumor cells and the host immune system, as well as the effects of the immune system on tumor growth and metastasis.

2.Immune Function of Mice:

Immune-deficient mouse models: Human-derived tumor cell lines are typically used in immune-deficient mouse models, such as nude mice or severe combined immunodeficiency (SCID) mice, to avoid immune rejection.

Immune-intact mouse models: Mouse-derived tumor cell lines can be transplanted into mice with the same genetic background that do not experience immune rejection.

3.Experimental Requirements:

Tumor type: Select the appropriate cell line based on the type of tumor being studied.

Metastatic characteristics: If studying metastasis, choose cell lines known to have metastatic capabilities.

Tumorigenicity: Select cell lines with good tumorigenicity in animal models to ensure reliable experimental results.

Luciferase expression: Choose cell lines with high luciferase activity to ensure clear signals in live imaging.

Cell culture conditions: Select cell lines that are easy to operate and culture.

Cell passages: Avoid using cell lines with excessively high passages.

Cell condition: Choose cell lines with good condition and no contamination.

Figure 2 Luciferase expression results of Ubigene's 4T1-Luc cells

5.Data Comparability:

According to some references and other sources, choose widely used cell lines with abundant data for easy comparison and validation.

After selecting the appropriate cell line and mouse model, the next step is the specific operational procedures for mouse tumor experiments.

1. Preparation Work

1.1. Cell Preparation

Culture Luciferase stable cells under suitable conditions in the culture medium, ensuring the cells are in good condition. When the cells reach 80-90% confluence, digest the cells with trypsin, centrifuge and resuspend the cells in PBS or serum-free medium, count the cells, adjust the concentration to 5x10^6 cells/100 µL (varying depending on the cell line), and keep on ice.

1.2. Mouse Preparation

Select the mouse strain: Choose an appropriate immune-deficient mouse (such as nude mice, SCID) or an immune-intact mouse based on experimental requirements.

Acclimatization: Acclimate the mice to the laboratory environment before the experiment.

2. Tumor Cell Implantation

Anesthetize the mouse, shave the injection site, disinfect with alcohol, aspirate the cell suspension using a 1 mL syringe, and inject the suspension subcutaneously. Besides subcutaneous injection, other methods include orthotopic injection, intraperitoneal injection, intravenous injection, etc., chosen based on the research purpose.

Tips:

Heterotopic transplantation involves injecting tumor cells directly into a non-primary site in the experimental animal, most commonly subcutaneously. This method is simple, facilitates tumor establishment and monitoring, but doesn't completely mimic the natural tumor growth environment and microenvironment.

Orthotopic transplantation involves injecting tumor cells into the site where tumors naturally occur, such as the liver, lungs, mammary glands, etc. This method closely resembles natural tumor growth conditions and better simulates the interaction between the tumor and the host.

Figure 3 Subcutaneous injection of cells in mice

3.（BLI）Bioluminescence Imaging (BLI)

Inject luciferase substrate intraperitoneally or intravenously, let the mouse move freely for 6-8 minutes, then anesthetize the mouse. 15-20 minutes post-infection, capture and record the bioluminescent signal using a BLI device.

Figure 4 BLI device and the mouse placed in camera box

Ubigene's Luciferase Cell Bank offers 200+ stable luciferase-expressing cell lines, known for strong specificity, high sensitivity, high imaging quality, and precise quantification of luminescent intensity. These cells effectively assist in transcription factor regulation studies, live animal imaging, cell tracking, and other experiments.

Advantages of Ubigene's Luciferase Cells

Example Results of Using Ubigene's Luciferase Cells for Tumor Formation