This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: For cancer patients undergoing head and neck radiation therapy, people living with Sjögren's syndrome, people with diabetes or older people, reduced saliva production and the resulting dry mouth are far more than uncomfortable. They can have major consequences for quality of life, making it difficult to eat, speak and swallow, altering taste perception, and increasing the risk of dental cavities and oral infections.
So, what actually happens in the salivary glands when they stop working properly? "The exact molecular processes inside the glands during these conditions have remained complex to map," says Golnaz Golnarnik, a researcher in the Department of Oral Biology, Faculty of Dentistry, University of Oslo. In her doctoral research, now published in Biochemistry and Biophysics Reports, she investigated what happens inside salivary gland acinar cells when oxidative stress disrupts their normal cellular processes.
Oxidative stress occurs when a cell's natural defense system becomes overwhelmed. "In simple terms, it is an imbalance," she explains. "As cells carry out their normal metabolism or face stressors like radiation or inflammation, they naturally produce reactive oxygen species.
These are highly reactive molecules that can cause damage. Normally, our cells have built-in antioxidant systems that act as a defense shield to neutralize reactive oxygen species and keep cells safe. "However, when this balance is disrupted and reactive oxygen species accumulate faster than antioxidants can clear them, the cell enters a state of oxidative stress.
This excess then damages essential parts of the cell. "In patients with conditions such as Sjögren's syndrome, diabetes or after radiation therapy, we see this increased oxidative stress. We believe this may be an important reason why salivary glands stop functioning properly and produce less saliva," she says.
One of the most important processes Golnarnik has investigated is how calcium signaling inside cells is affected by oxidative stress. "Saliva production is a very finely tuned process," she explains. It is controlled by the nervous system through small changes in calcium levels inside the cells.
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