GFP image analysis in the mouse orthotopic bladder cancer model

Area of Science:

• Oncology
• Biotechnology
• Medical Imaging

Background:

• Standardized, objective measurements for tumor response in mouse orthotopic bladder cancer models are lacking.
• Current histological methods can be labor-intensive and may limit further sample analysis.

Purpose of the Study:

• To evaluate the efficacy of image analysis combined with green fluorescent protein (GFP) for objective measurement of tumor response in an orthotopic bladder cancer mouse model.
• To compare the sensitivity and precision of image analysis versus traditional histology for assessing tumor regression after chemotherapy.

Main Methods:

• KU-7 human bladder cancer cells transfected with GFP were inoculated into nude mice.
• Mice received either PBS (control) or doxorubicin treatment.
• Tumor size was quantified using fluorescent imaging analysis and confirmed with histological examination.

Main Results:

• Image analysis with GFP demonstrated a significant difference in tumor regression (12-fold by tumor area, 9-fold by % tumor area) compared to histology (9-fold and 5-fold, respectively).
• Tumor incidence was 100% by GFP expression and 80% by histology in the doxorubicin group.
• Image analysis provided more sensitive and objective tumor size measurements.

Conclusions:

• Image analysis with GFP is a precise, sensitive, and objective method for assessing tumor growth and treatment response in orthotopic bladder cancer models.
• This method reduces the number of animals needed and makes tissue samples available for additional research, offering cost and labor efficiencies.