Abstract
Tumor metastasis, a complex phenomenon in which tumor cells spread to new organs, is one of the greatest challenges in cancer research and is the leading cause of cancer-induced death. Numerous studies have shown that oncoviruses and their encoded proteins significantly affect metastasis, especially the EMT process. ALV-J and MDV are classic tumorigenic retrovirus and herpesvirus, respectively. We found that ALV-J and MDV synergistically promoted EMT. Further, we identified the tumor stem cell marker DCLK1 in ALV-J and MDV co-infected cells. DCLK1 directly interacted with β-catenin, promoting the formation of the β-catenin-TCF4 complex. This interaction activated the Wnt/β-catenin pathway, thereby inducing EMT and paving the way for synergistic tumor metastasis. Exploring the molecular mechanisms by which ALV-J and MDV cooperate during EMT will contribute to our understanding of tumor progression and metastasis. This study provides new insights into the cooperative induced tumor metastasis by retroviruses and herpesviruses.
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