Abstract
Dendrobium officinale is an herbal medicine that has been clinically used to promote body fluid production.
Previous works demonstrated that D. officinale polysaccharides could ameliorate symptoms of salivary secretion of patients with
Sjögrenʼs syndrome and in a respective mice model. In the present study, we investigated
the underlying mechanism by which D. officinale polysaccharides activate M3 muscarinic receptors and induce extracellular calcium
influx, leading to the translocation of aquaporin 5, a water channel protein, to the
apical membrane of human submandibular gland epithelial cells. Enzymatic treatment
of D. officinale polysaccharides suggested that they are hydrolyzed but do not permeate cell membranes.
This finding supports the pharmacological activity of D. officinale polysaccharides to promote salivary secretion.
Key words
Dendrobium officinale
- Orchidaceae - polysaccharides - M3 muscarinic receptor - aquaporin 5