Study identifies calcium and cell stress as new triggers for STING protein

A study published in April 2026 identified two previously unknown ways the STING protein can be activated inside cells. An increase in calcium in the cytoplasm combined with stress in the endoplasmic reticulum triggered an antiviral and inflammatory response without the need for DNA detection.

The STING protein sits in the endoplasmic reticulum and helps control inflammation. It is best known for detecting misplaced DNA and sounding an alarm when the cell's genetic material leaves its normal location. The new research shows STING can also respond to other forms of cellular stress.

STING in inflammation STING activation can either protect against infection or produce an excessive response, depending on the virus and the patient's condition. Certain mutations in the STING gene cause rare chronic inflammatory diseases that appear most often in children.

Poor regulation of inflammation contributes to severe illness in infections such as COVID-19. It also plays a part in cancer immunotherapy, autoimmune conditions, coronary disease, cellular ageing, and neurodegenerative disorders including Alzheimer's and Parkinson's.

Calcium and cell stress as triggers Researchers described the cell as a kitchen in which calcium acts like a potent spice. A small, controlled amount supports normal function, but an overload can lead to cell death. The same calcium imbalance and endoplasmic reticulum stress occur in immune activation during cancer and in various infections.

The study concludes that calcium-mediated STING activation could improve protection against infections or help manage autoimmune inflammatory processes.