Sting1, also known as STING or TMEM173, is an endoplasmic reticulum (ER) protein. It plays a fundamental role in the production of type I interferons (IFNs) and pro-inflammatory cytokines by activating multiple transcription factors in response to microbial or host-derived DNA [1]. It is a key component of the cGAS-STING pathway, which is crucial for innate immune response, and is also involved in autophagy and various cell death modalities, thus having great biological importance [1]. Genetic models, like KO/CKO mouse models, are valuable for studying its functions.

In a murine model of nephrotoxic nephritis, Sting1-/-mice had lower kidney cytokine expression, milder kidney infiltration by immune cells, and decreased disease severity in rapidly progressive/crescentic glomerulonephritis (RPGN/CGN), indicating that Sting1 activation is a pathological mechanism in RPGN/CGN [2].

In conclusion, Sting1 is essential for the cGAS-STING pathway-mediated innate immune response, and its regulation of autophagy and cell death has implications in multiple biological processes. The study of Sting1 KO mouse models has contributed to understanding its role in diseases such as RPGN/CGN, providing insights into potential therapeutic strategies targeting Sting1 or its upstream regulators.

References:

1. Zhang, Ruoxi, Kang, Rui, Tang, Daolin. 2021. The STING1 network regulates autophagy and cell death. In Signal transduction and targeted therapy, 6, 208. doi:10.1038/s41392-021-00613-4. https://pubmed.ncbi.nlm.nih.gov/34078874/

2. García-Giménez, Jorge, Córdoba-David, Gina, Rayego-Mateos, Sandra, Ortiz, Alberto, Ramos, Adrián M. 2023. STING1 deficiency ameliorates immune-mediated crescentic glomerulonephritis in mice. In The Journal of pathology, 261, 309-322. doi:10.1002/path.6177. https://pubmed.ncbi.nlm.nih.gov/37650295/