Some very interesting information came out of a recent study done on Sjogren's Syndrome.
"The study found that natural killer cells were more active in patients
with the syndrome. It also found that natural killer cells from
Sjögren's syndrome patients tended to have a higher number of receptors,
known as NKp30 receptors, on their surface. These receptors work by
helping natural killer cells interact with other cells, and thus,
trigger an immune response.....
......Background information from the study tells us that the NKp30 receptors
also bind to help a small molecule that is produced on the surface of
salivary-gland cells when the cells are stressed by things such as
inflammation or infection. This interaction may play a role in the
persistence of the disease, according to researchers."
This info was posted in an article published on Science World Report. You can read the article in it's entirety here. Live Science has also posted a brief article about the study here.