KOREASCHOLAR

Glutamate-induced oxidative injury contributes to neuronal degeneration in many central nervous system (CNS) diseases, such as Parkinson’s disease, Alzheimer’s disease, epilepsy and ischemia. Inducible heme oxygenase (HO)-1 acts against oxidants that are thought to play a role in the pathogenesis of these diseases. The EtOH extracts of Viola mandshurica (NNMBS274), Viola patrinii (NNMBS275) and Viola papilionacea Pursh (NNMBS276), origin plants of Violae Herba, showed the potent neuroprotective effects on glutamate-induced neurotoxicity. Among them, NNMBS275, the extract of V. patrinii possessed the protective effects against glutamate toxicity by inducing the expression of heme oxygenase (HO)-1 in the mouse hippocampal HT22 cells. These results suggest that extracts of V. patrinii could be the effective candidates for the treatment of ROS-related neurological diseases. Furthermore, it is suggested that the protective effects of V. patrinii extract due to inducing the expression of HO-1 asAs the exfoliated keratinocytes (EKs) in oral mucosa are aging and degenerating cells, of which cytoplasms are almost replaced by cross-linked keratin materials. Consequently, the EKs become apoptotic with nuclear lysis. A question is arisen what is the biological role of these EKs in oral cavity? Are they simply degrading as aging keratinocytes or do they have some essential function still remained in the exfoliated status? The buccal smear samples from ten healthy adult subjects were observed under scanning electron microscope. On the outer surface of the EKs the features of bacterial adhesion were explored. The microorganisms attached on the surface of EKs were much deformed, shrunken and teared. Only a few microorganisms were found on the EK surface, aggregated focally. The attached microorganisms were gradually fused on the cell membrane of EKs, and subsequently endocytosed. Resultantly, many round endocytotic concave cavities similar size to the cocci were remained on the surface of EKs similar to the sequels of caveolae endocytosis. These data indicate that the degenerating EKs can actively engulf microorganisms attached on their cell surface via the processes of caveolae endocytosis. Therefore, it is presumed that the oral EKs still play a role for endocytotic scavenging of oral microorganisms using the denatured cell bodies themselves, which become highly adherent to oral microorganisms and still function for caveolae endocytosis in mixed saliva environment. an antioxidant/cytoprotective target

Ⅰ. INTRODUCTION
 Ⅱ. MATERIALS AND METHODS
 Ⅲ. RESULTS
 Ⅳ. DISCUSSION
 Ⅴ. REFERENCES

• 김연숙(Department of Dental Hygiene, College of Health, Cheongju University) | Yeon Sook Kim
• 안지영(Department of Oral Pathology, College of Dentistry, Gangneung-Wonju National University) | Ji Young Ahn
• 이석근(Department of Oral Pathology, College of Dentistry, Gangneung-Wonju National University) | Suk Keun Lee correspondence