Figure 2.
During contact with stromal fibroblasts, breast cancer cells activate NOTCH1/MYC signaling that leads to higher transcription of ncRNA RN7SL1 carrying 5’-ppp. These transcripts then remain unshielded since levels of their protein-binding partner (SRP9/14) remain constant. Naked RN7SL1 is loaded to exosomes and, upon interaction with breast cancer cells, can activate RIG-I signaling leading to an inflammatory tumor microenvironment that can promote tumor progression and poor clinical outcomes.