TGF-β signaling promotes cervical cancer metastasis via CDR1as

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• Metastasis is a primary cause of cancer-related mortality due to limited effective treatments.
• The transforming growth factor beta (TGF-β) pathway is implicated in cervical cancer metastasis, but its precise mechanisms remain elusive.

Purpose of the Study:

• To elucidate the role of circular RNA (circRNA) in TGF-β-induced cervical cancer metastasis.
• To investigate the specific circRNA, CDR1as, and its interaction with the TGF-β pathway and metastasis-associated proteins.

Main Methods:

• RNA sequencing to identify circRNA expression profiles after TGF-β activation.
• In situ hybridization, real-time PCR, Western blot, RNA interference, Transwell, wound healing, RNA pulldown, and RIP assays.
• In vivo cervical cancer models (foot pad and subcutaneous tumor formation).

Main Results:

• CDR1as expression was significantly upregulated following TGF-β activation and positively correlated with lymph node metastasis and poor prognosis.
• Overexpression of CDR1as promoted cervical cancer cell metastasis in vitro and in vivo.
• CDR1as facilitates the stabilization of SLUG mRNA via IGF2BP1, and silencing IGF2BP1 inhibits CDR1as-driven metastasis. CDR1as also activates TGF-β signaling (P-Smad2, P-Smad3), promoting epithelial-mesenchymal transition (EMT).

Conclusions:

• The study demonstrates that TGF-β signaling promotes cervical cancer metastasis through the upregulation and action of CDR1as.
• CDR1as, in conjunction with IGF2BP1, plays a critical role in stabilizing SLUG and driving metastasis, offering potential therapeutic targets.