Prolyl 3-Hydroxylase 2 Supports a Pro-Angiogenic Milieu Promoting Colorectal Cancer Progression and Metastasis

Area of Science:

• Biochemistry
• Cancer Biology
• Extracellular Matrix Biology

Background:

• Prolyl 3-hydroxylase 2 (P3H2) is crucial for extracellular matrix (ECM) structure and angiogenesis.
• Its role in colorectal cancer (CRC) progression is not well-defined, despite evidence suggesting tumor suppressor activity.

Purpose of the Study:

• To investigate the function of P3H2 in colorectal cancer (CRC) progression.
• To explore the impact of P3H2 on tumor growth, invasion, and metastasis in CRC.

Main Methods:

• Bioinformatic analysis of patient data to assess P3H2 transcript levels in colon adenocarcinoma.
• Generation of a stable HCT116 CRC cell line overexpressing P3H2.
• In vitro assays for cell proliferation and invasion, and in vivo studies in mouse models to evaluate tumor growth and metastasis.
• Analysis of tumor microenvironment (TME) modifications, including Collagen IV remodeling and vessel density.

Main Results:

• P3H2 transcript levels were significantly reduced in colon adenocarcinoma and metastatic lesions.
• P3H2 overexpression inhibited anchorage-independent growth but enhanced cellular invasion in vitro.
• In vivo, P3H2 overexpression accelerated tumor growth and significantly increased lung metastases.
• P3H2 remodeled the TME, altering Collagen IV and increasing vessel density.

Conclusions:

• P3H2 acts as a dynamic enzymatic switch in the tumor microenvironment (TME) of CRC.
• P3H2-driven ECM remodeling is a potential therapeutic target in advanced CRC, particularly for combination therapies targeting angiogenesis.