Optimizing orthotopic bladder tumor implantation in a syngeneic mouse model

Area of Science:

• Urology
• Oncology
• Animal Models

Background:

• Orthotopic mouse models are crucial for studying bladder cancer.
• Developing reliable methods for tumor cell implantation is essential for preclinical research.

Purpose of the Study:

• To establish a reproducible technique for orthotopically implanting MBT-2 murine bladder cancer cells in a syngeneic mouse model.
• To evaluate the efficacy of different chemical pretreatments on tumor implantation success.

Main Methods:

• MBT-2 cells were transurethrally implanted into C3H/He mice after bladder pretreatment with saline, HCl, trypsin, or poly-L-lysine.
• Tumor take and volume were assessed using micro ultrasound, with subsequent bladder weight and histopathological analysis.

Main Results:

• HCl pretreatment led to adverse reactions and was discontinued.
• Trypsin and poly-L-lysine pretreatments resulted in high tumor take rates (83%) without significant adverse effects.
• A higher cell dose (2 x 10^6) increased tumor take rate compared to a lower dose (1 x 10^6).

Conclusions:

• A reliable and feasible method for orthotopic bladder tumor cell implantation in a syngeneic mouse model was established.
• Poly-L-lysine and trypsin are effective pretreatment agents for enhancing bladder tumor uptake.
• This model is suitable for evaluating bladder cancer treatment strategies.