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LATS1 Promotes B-ALL Tumorigenesis by Regulating YAP1 Phosphorylation and Subcellular Localization
Feng Zhang1, Mohammed Awal Issah2, Hai-Ying Fu3
1Fujian Provincial Key Laboratory on Hematology, Fujian Medical Center of Hematology, Fujian Institute of Hematology, Clinical Research Center for Hematological Malignancies of Fujian Province, Fujian Medical University Union Hospital, Fuzhou, 350001, China.
YAP1's role in B cell acute lymphoblastic leukemia (B-ALL) was explored. High YAP1 expression with low phosphorylation correlated with poor prognosis, suggesting VP targeting this axis for B-ALL therapy.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- The YAP1 protein has a dual role in cancer, acting as both an oncogene and a tumor suppressor.
- The specific function of YAP1 in B cell acute lymphoblastic leukemia (B-ALL) remains unclear.
- YAP1 phosphorylation patterns may dictate its function in tumorigenesis.
Purpose of the Study:
- To investigate the role of YAP1 in B-ALL.
- To determine the prognostic significance of YAP1 expression and phosphorylation in B-ALL patients.
- To explore potential therapeutic strategies targeting the YAP1 axis in B-ALL.
Main Methods:
- YAP1 and LATS1 levels were assessed using Western blotting, qPCR, and flow cytometry in NALM6 and MOLT-4 cell lines.
- Nude mouse subcutaneous tumorigenesis experiments were conducted.
- RNA-Seq was used to compare gene expression of Hippo pathway molecules before and after verteporfin (VP) treatment.
Main Results:
- High YAP1 expression and low YAP1-Ser127 phosphorylation were associated with worse prognoses in ALL patients.
- YAP1-Ser127 phosphorylation was lower, and YAP1 localized to the nucleus in NALM6 cells compared to MOLT-4 and control cells.
- YAP1 knockdown inhibited proliferation and arrested the cell cycle in NALM6 cells. VP treatment upregulated LATS1, promoting YAP1-Ser127 phosphorylation.
Conclusions:
- LATS1 may downregulate YAP1-Ser127 phosphorylation, maintaining B-ALL cell function.
- Verteporfin (VP) targeting the LATS1-YAP1 axis presents a potential therapeutic strategy for B-ALL.
- Further research into YAP1's role and targeted therapies could improve B-ALL patient outcomes.
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