Association of TGF-β signaling with drug resistance across various cancer types

Effect of TGF-β signalingMechanism of drug resistanceCancer type(s) implicatedReference(s)
Overall associationActivation of TGF-β signaling often correlates with increased drug resistance.Melanoma, non-small cell lung cancer, breast cancer, hepatocellular carcinoma, colorectal cancer, squamous cell carcinoma, osteosarcoma, and tumor-initiating cells.[44, 73, 111116]
Exosome-mediated transferExosome-mediated transfer of TGF-β1 from resistant cells increases cell survival, reduces apoptosis, and enhances cell mobility.Breast cancer.[123]
Autophagy promotionTGF-β promotes autophagy, leading to increased drug resistance.Osteosarcoma (specifically, in mesenchymal stem cells), breast and pancreatic cancer cell lines.[25, 124]
Quiescence/senescenceTGF-β activation leads to a population of slow-cycling cells resistant to cisplatin, potentially via NRF2 and p21 overexpression.Squamous cell carcinoma.[72]
Cancer stem cell inductionTGF-β can activate the AKT pathway, leading to increased expression of cancer stem cell markers (SOX2, ABCG2) and cisplatin resistance.Squamous cell carcinoma.[126]
Pathway downregulationDownregulation of TGF-β signaling (e.g., MITF inhibition, SMAD2 downregulation, and SMAD4 loss) can paradoxically lead to drug resistance by upregulating anti-apoptotic proteins.Melanoma, non-small cell lung cancer, and colorectal cancer.[128130]

TGF-β: transforming growth factor-β