Declined salivary gland function is commonly observed in patients with diabetes. Advanced glycation end products (AGEs) are believed to contribute to the pathogenesis of diabetes-induces hypofunction of the salivary glands. Polydatin (resveratrol-3-O-β-mono-D-glucoside) is a polyphenol that can be easily accessed from peanut, grape, and red wines. Although polydatin is known to have anti-glycation, anti-oxidation, and anti-inflammation effects, its effect in the salivary gland is not known. In the present study, we evaluated the AGEs burden in the salivary gland in streptozotocin (STZ)-induced diabetic rats and the protective effect of polydatin on diabetes-related salivary hypofunction. Polydatin (50 and 100 mg/kg/day) was orally administered in the STZ-induced diabetic rats for 4 weeks. The results showed that the salivary flow rate of the STZ-induced diabetic rats was reduced compared with that in the normoglycemic control rats. The circulating AGEs in serum and secreted AGEs in saliva increased in the STZ-induced diabetic rats. The reactive oxygen specises (ROS) were highly generated in the salivary gland in these diabetic rats. The salivary gland from the diabetic rats showed increased acinar cell apoptosis compared to normoglycemic control mice. However, polydatin suppressed all of these diabetes-related salivary changes. Overall, polydatin could provide a beneficial option for diabetes-related salivary hypofunction.

5,4'-dihydroxystilbene-3-O-D-glucopyranoside (polydatin)는 호장(Polygonum cuspidatum)에 존재하는 stilbenes류의 하나로 지금까지 피부에서의 효능이 잘 알려지지 않았다. 우리는 호장으로부터 Polydatin을 분리하여 얻었으며, 피부유래의 멜라노사이트와 fibroblast를 이용하여 효능을 검증하였다. 실험결과 멜라노사이트에서 polydatin은 타이로시네이즈 활성과 멜라닌 생성을 억제하였고, 멜라닌 생합성 과정에 관여하는 타이로시네이즈와 전사인자인 microphthalmia-associated transcription factor (MITF)의 발현을 억제하는 것을 확인하였다. 미백효과가 확인된 polydatin에 대하여 human fibroblast를 대상으로 type I procollagen 생합성에 미치는 영향을 분석한 결과 polydatin은 농도 의존적으로 콜라젠 합성을 촉진함을 알 수 있었다. 또한 polydatin의 피부에서의 효능을 검증하기 위해 인체효력시험을 통해 주름개선과 미백개선 효능을 검증하였으며 이를 통해 주름과 미백기능에 있어 유의한 효과를 확인하였다. 이상의 결과로부터 polydatin은 안전한 피부 미백 개선제 및 주름개선제로 사용될 수 있는 후보물질임을 제안하며, 상업적으로 활용하기 위해 원료화를 성공하였다.