The analog of cGAMP, c-di-AMP, activates STING mediated cell death pathway in estrogen-receptor negative breast cancer cells

• Published in: Apoptosis (London) 2021-06, Vol.26 (5-6), p.293-306
• Main Authors: Vasiyani, Hitesh, Shinde, Anjali, Roy, Milton, Mane, Minal, Singh, Kritarth, Singh, Jyoti, Gohel, Dhruv, Currim, Fatema, Vaidya, Khushali, Chhabria, Mahesh, Singh, Rajesh
• Format: Article
• Language: English
• Subjects: AMP; Apoptosis; Apoptosis - drug effects; Biochemistry; Biomedical and Life Sciences; Biomedicine; Breast cancer; Cancer Research; Caspase-9; Cell Biology; Cell death; Cell Death - drug effects; Cell Line, Tumor; Cyclic GMP; Cytoplasm; Dinucleoside Phosphates - metabolism; Dinucleoside Phosphates - pharmacology; Estrogen receptors; Estrogens; Genomic instability; Humans; Immune response; Immune system; Immunity, Innate - drug effects; Inflammation; Innate immunity; Interferon; Interferon regulatory factor 3; Interferon Regulatory Factor-3 - metabolism; Interferon Type I - metabolism; Membrane Proteins - genetics; Membrane Proteins - metabolism; Metastases; Metastasis; Mitochondria; Mitochondria - metabolism; Mortality; Nuclear transport; Oncology; Protein Binding; Receptors; Receptors, Estrogen - metabolism; Receptors, Progesterone - metabolism; Signal Transduction - drug effects; Transcription; Translocation; Triple Negative Breast Neoplasms - metabolism; Triple Negative Breast Neoplasms - pathology; Tumor cell lines; Tumor microenvironment; Tumorigenesis; Virology
• ISSN: 1360-8185; 1573-675X
• DOI: 10.1007/s10495-021-01669-x

Immune adaptor protein like STING/MITA regulate innate immune response and plays a critical role in inflammation in the tumor microenvironment and regulation of metastasis including breast cancer. Chromosomal instability in highly metastatic cells releases fragmented chromosomal parts in the cytoplasm, hence the activation of STING via an increased level of cyclic dinucleotides (cDNs) synthesized by cGMP-AMP synthase (cGAS). Cyclic dinucleotides 2’ 3’-cGAMP and it's analog can potentially activate STING mediated pathways leading to nuclear translocation of p65 and IRF-3 and transcription of inflammatory genes. The differential modulation of STING pathway via 2’ 3’-cGAMP and its analog and its implication in breast tumorigenesis is still not well explored. In the current study, we demonstrated that c-di-AMP can activate type-1 IFN response in ER negative breast cancer cell lines which correlate with STING expression. c-di-AMP binds to STING and activates downstream IFN pathways in STING positive metastatic MDA-MB-231/MX-1 cells. Prolonged treatment of c-di-AMP induces cell death in STING positive metastatic MDA-MB-231/MX-1 cells mediated by IRF-3. c-di-AMP induces IRF-3 translocation to mitochondria and initiates Caspase-9 mediated cell death and inhibits clonogenicity of triple-negative breast cancer cells. This study suggests that c-di-AMP can activate and modulates STING pathway to induce mitochondrial mediated apoptosis in estrogen-receptor negative breast cancer cells.