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Updated: Nov 28, 2025
Pre-clinical Orthotopic Murine Model of Human Prostate Cancer
Published on: August 29, 2016
KLK4 Induces Anti-Tumor Effects in Human Xenograft Mouse Models of Orthotopic and Metastatic Prostate Cancer
Brian W-C Tse1,2,3, Thomas Kryza2,3,4, Mei-Chun Yeh2,3
1Preclinical Imaging Facility, Translational Research Institute, Brisbane, QLD 4102, Australia.
Abstract:
Recent reports have suggested the role of kallikrein-related peptidase 4 (KLK4) to be that of remodeling the tumor microenvironment in many cancers, including prostate cancer. Notably, these studies have suggested a pro-tumorigenic role for KLK4, especially in prostate cancer. However, these have been primarily in vitro studies, with limited in vivo studies performed to date. Herein, we employed an orthotopic inoculation xenograft model to mimic the growth of primary tumors, and an intracardiac injection to induce metastatic dissemination to determine the in vivo tumorigenic effects of KLK4 overexpressed in PC3 prostate cancer cells. Notably, we found that these KLK4-expressing cells gave rise to smaller localized tumors and decreased metastases than the parent PC-3 cells. To our knowledge, this is the first report of an anti-tumorigenic effect of KLK4, particularly in prostate cancer. These findings also provide a cautionary tale of the need for in vivo analyses to substantiate in vitro experimental data.
Insights
Kallikrein-related peptidase 4 (KLK4) may surprisingly inhibit prostate cancer growth and metastasis. This study highlights the need for in vivo research to confirm in vitro findings on KLK4's role.
Area of Science:
- Oncology
- Biochemistry
- Molecular Biology
Background:
- Kallikrein-related peptidase 4 (KLK4) has been implicated in remodeling the tumor microenvironment.
- Previous in vitro studies suggested a pro-tumorigenic role for KLK4 in prostate cancer.
Purpose of the Study:
- To investigate the in vivo tumorigenic effects of KLK4 overexpression in prostate cancer cells.
- To determine if KLK4 exhibits anti-tumorigenic properties in a relevant animal model.
Main Methods:
- Utilized an orthotopic inoculation xenograft model to simulate primary tumor growth.
- Employed intracardiac injection in mice to induce metastatic dissemination.
- Overexpressed KLK4 in PC3 prostate cancer cells for in vivo analysis.
Main Results:
- KLK4-expressing prostate cancer cells formed smaller localized tumors compared to control cells.
- Metastatic dissemination was significantly decreased in tumors with KLK4 overexpression.
- These findings contradict previous in vitro studies suggesting a pro-tumorigenic role for KLK4.
Conclusions:
- KLK4 demonstrates an anti-tumorigenic effect in vivo, specifically within the context of prostate cancer.
- In vivo studies are crucial for validating in vitro experimental data regarding KLK4's function.
- This research offers a new perspective on KLK4's role in cancer progression.
