Article ; Online: SMAD2/3 mediate oncogenic effects of TGF-β in the absence of SMAD4.
Communications biology
2022 Volume 5, Issue 1, Page(s) 1068
Abstract: TGF-β signaling is involved in pancreatic ductal adenocarcinoma (PDAC) tumorigenesis, representing one of the four major pathways genetically altered in 100% of PDAC cases. TGF-β exerts complex and pleiotropic effects in cancers, notably via the ... ...
Abstract | TGF-β signaling is involved in pancreatic ductal adenocarcinoma (PDAC) tumorigenesis, representing one of the four major pathways genetically altered in 100% of PDAC cases. TGF-β exerts complex and pleiotropic effects in cancers, notably via the activation of SMAD pathways, predominantly SMAD2/3/4. Though SMAD2 and 3 are rarely mutated in cancers, SMAD4 is lost in about 50% of PDAC, and the role of SMAD2/3 in a SMAD4-null context remains understudied. We herein provide evidence of a SMAD2/3 oncogenic effect in response to TGF-β1 in SMAD4-null human PDAC cancer cells. We report that inactivation of SMAD2/3 in SMAD4-negative PDAC cells compromises TGF-β-driven collective migration mediated by FAK and Rho/Rac signaling. Moreover, RNA-sequencing analyses highlight a TGF-β gene signature related to aggressiveness mediated by SMAD2/3 in the absence of SMAD4. Using a PDAC patient cohort, we reveal that SMAD4-negative tumors with high levels of phospho-SMAD2 are more aggressive and have a poorer prognosis. Thus, loss of SMAD4 tumor suppressive activity in PDAC leads to an oncogenic gain-of-function of SMAD2/3, and to the onset of associated deleterious effects. |
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MeSH term(s) | Carcinogenesis/genetics ; Carcinoma, Pancreatic Ductal/metabolism ; Humans ; Pancreatic Neoplasms/metabolism ; RNA ; Smad2 Protein/genetics ; Smad2 Protein/metabolism ; Smad3 Protein/metabolism ; Smad4 Protein/genetics ; Smad4 Protein/metabolism ; Transforming Growth Factor beta/pharmacology ; Transforming Growth Factor beta1/metabolism ; Pancreatic Neoplasms |
Chemical Substances | SMAD2 protein, human ; SMAD3 protein, human ; SMAD4 protein, human ; Smad2 Protein ; Smad3 Protein ; Smad4 Protein ; Transforming Growth Factor beta ; Transforming Growth Factor beta1 ; RNA (63231-63-0) |
Language | English |
Publishing date | 2022-10-07 |
Publishing country | England |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ISSN | 2399-3642 |
ISSN (online) | 2399-3642 |
DOI | 10.1038/s42003-022-03994-6 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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