• Journal of the Society of Cosmetic Scientists of Korea
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• v.32 no.1 s.55
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• pp.7-15
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• 2006

In this study, the effect of oligopeptide ($Oligosproutin^{(R)}$) from sprouted black rice was evaluated for possible improvement in skin elasticity. We examined the changes in gene expression on oligopeptide-treated HaCaT cells using DNA microarray analysis. As a result, oligopeptide treatment showed a differential expression ratio of more than 2-fold : 745 genes were activated and 1011 genes were repressed. One of the most interesting findings is a 2-fold increase in hyaluronan synthase 2 (HAS 2) gene expression by oligopeptide. We also found that oligopeptide increased cell proliferation, HAS2 mRNA expression and intracellular ROS scavenging activity in HaCaT cells. A human clinical study which oil-in-water emulsion with oligopeptide was topically applied showed significant increase in skin elasticity. These results suggest that the sprouted black rice oligopeptide ($Oligosproutin^{(R)}$) can be effective anti-aging ingredient for cosmetics.

• The Science & Technology
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• v.30 no.4 s.335
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• pp.49-50
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• 1997

동물복제ㆍ인간복제로 떠들썩한 요즈음 우리나라에서 유전공학 바람을 일으키는 주축으로 활약하고 있는 서울대 자연대 미생물학과 강현삼교수. 강교수는 원숭이에서 암을 유발시키는 SV40 바이러스가 가진 암유발유전자와 형질 변형시킨 사람의 각질세포를 이용한 조직배양 실험을 통해 인슐린 등 생존요소를 투입할 경우 아폽토시스 과정을 촉진시켜 암을 억제할 수 있다는 논문을 발표해 관심을 끌고 있다.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.40 no.1
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• pp.21-28
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• 2014

In this study, Eucommia ulmoides Oliver extracts was studied in order to see any effects on the ${\beta}$-hexosaminidase release suppression of RBL-2H3 cells and on the expression of filaggrin, transglutaminase-1 (TGase-1) and cornified cell envelope (CE) related to the recovery of HaCaT keratinocyte skin barrier. Results showed that Eucommia ulmoides Oliver extracts reduced ${\beta}$-hexosaminidase release in RBL-2H3 cells and increased the effects of Eucommia ulmoides Oliver extract on the expression of filaggrin, transglutaminase-1 (TGase-1) and cornified cell envelope (CE) in HaCaT keratinocytes. Taken together, these results suggested that Eucommia ulmoides Oliver extract may be applicable for keratinocyte differentiation.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.42 no.4
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• pp.359-366
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• 2016

Exosome, a small vesicle secreted from cells, has diverse functions depending on cell origins and tissue types and plays a important role in cell viability and intercellular communication. Recently, many researchers have demonstrated the use of exosomes for the treatment of cancers and immune diseases, and the development of diagnostic biomarker. However, the secretion mechanism of exosome from skin cell and its physiological functions in skin remain unclear. Thus, this study aimed to explore whether keratinocyte-derived exosome affects proliferation and migration in HaCaTs. Exosomes were isolated from HaCaTs by ExoQuick-TC and then boiled or unbolied. Boiled and unboiled exosome induced proliferation in HaCaTs in a dose-dependant manner ($0.1{\sim}20{\mu}g/mL$), respectively. Boiled and unboiled exosome at concentration of $20{\mu}g/mL$ increased proliferation level in HaCaTs by $186.96{\pm}3.87%$ and $193.48{\pm}10.48%$ compared with control group. Unboiled exosome stimulated migration in HaCaTs in a dose-dependent manner ($0.1{\sim}20{\mu}g/mL$), which reached a maxium at concentration of $20{\mu}g/mL$ ($179.39{\pm}4.89%$ of control), but boiled exosome did not affect HaCaT migration. In addition, unboiled exosome ($0.1{\sim}20{\mu}g/mL$) dose-dependently stimulated sprout outgrowth in HaCats. These results demonstrate that in exosome from HaCaTs, heat-stable components such as lipid may induce HaCaT proliferation and heat-unstable components such as protein may stimulate migration and sprout outgrowth in HaCaTs, thereby leading to reepithelialization and skin-wound healing activities. It is concluded that exosomes from HaCaTs may be used as cosmetic materials.

• Microbiology and Biotechnology Letters
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• v.44 no.3
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• pp.285-292
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• 2016

In the present study, we evaluated the in vitro wound-healing properties of two types of rice cell extracts (RCEs; prepared using ethanol and pressurized hot water extraction methods), using human dermal fibroblasts and keratinocytes. The effects of the RCEs (at 25–100 μg/ml) on cytotoxicity and cell migration were assessed. Both RCEs were not cytotoxic to the two cell types, instead increasing their proliferation by up to 25% in a dose-dependent manner compared with the controls. Furthermore, both RCEs significantly enhanced the migratory ability of the two cell types (fibroblast, 230–450%; keratinocyte, 170–350%). Additionally, we examined the effect of the RCEs on type I collagen synthesis, which is important in the wound reconstruction process. The RCEs significantly increased collagen type I mRNA and protein levels to a degree comparable to that induced by vitamin C. These results suggest the RCEs to be candidate materials for use in promoting wound healing, through their actions of increasing cell migration and accelerating wound re-epithelialization.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.30 no.2
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• pp.247-251
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• 2004

UV radiation exerts various influences in the skin, including photoaging and inflammation (1). The MMPs (Matrix metalloproteinases), which are induced by UV irradiation, can degrade matrix proteins, and these results in a collagen deficiency in photodamaged skin that leads to skin wrinkling. It has been known that the production of PGE$_2$ stimulates MMPs expression, and inhibits procollagen (2). Thus, it is possible that the induction of MMPs and the inhibition of matrix protein synthesis by UV -induced PGE$_2$ may play some role in UV-induced collagen deficiency in photoaged skin. Fructose-1,6-diphosphate (FDP), a glycolytic metabolite, is reported to have cytoprotective effects against ischemia and postischemic reperfusion injury of brain and heart, presumably by augmenting anaerobic carbohydrate metabolism (3). And also, FDP significantly prevent skin aging by decreasing facial winkle compared with vehicle alone after 6 months of use. We studied the mechanism of anti-aging effect of FDP on UVB-irradiated HaCaT keratinocyte model. FDP has protective role in UVB injured keratinocyte by attenuating prostaglandin E$_2$ (PGE$_2$) production and COX-2 expression. And FDP also suppressed UVB-induced MMP-2 expression. Further, to delineate the inhibition of UVB-induced COX-2 and MMPs expression with cell signaling pathways, treatment of FDP to HaCaT keratinocytes resulted in marked inhibition of UVB-induced phosphorylation of ERK1/2, JNK. It also prevents UV induced NFB translocation, which are activated by cellular inflammatory signal. Our results indicate that FDP has protecting effects in UV-injured skin aging by decreasing UVB-induced COX-2 and MMPs expression, which are possibly through blocking UVB-induced signal cascades.

• Archives of Plastic Surgery
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• v.37 no.4
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• pp.317-322
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• 2010

Purpose: There is no clear evidence of the original cause of hypertrophic scar, and the effective method of treatment is not yet established. Recently the steps of searching in gene and molecular level are proceeding. we are trying to recognize the difference between keratinocytes of hypertrophic scar and normal skin. Then we do support the comprehension of the scar formation mechanism and scar management. Methods: Total RNAs were extracted from cultured keratinocytes from 4 hypertrophic scars and normal skins. The cDNA chips were prepared. A total of 3063 cDNAs from human cDNA library were arrayed. And the scanning data were analyzed. Results: On microarray, heat shock protein, pyruvate kinase, tumor rejection antigen were more than 2 fold intensity genes. Among them, heat shock 70 kd protein showed the strongest intensity difference. Conclusion: In this study, it can be concluded that heat shock proteins play an important role in the process of wound healing and scar formation. This study provides basic biologic information for scar research. The new way of the prevention and treatment of scar formation would be introduced with further investigations.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.49 no.1
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• pp.87-96
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• 2023

This study was conducted to discover substances that regulate skin surface acidification using human epidermal keratinocyte cell lines, and to investigate their effects on the moisturizing ability and skin barrier function of the stratum corneum. Prunella vulgaris (P. vulgaris) is an herb widely distributed in Northwest Africa and North America that has been studied for its anti-apoptotic, antioxidant, and anti-inflammatory effects. However, research on the regulation of NHE1 expression and the restoration of skin barrier function has not been conducted. Analysis of P. vulgaris revealed the presence of rosmarinic acid and caffeic acid as active ingredients, which were tested for toxicity in human epidermal keratinocyte cell lines (HaCaT), and showed no toxic effects were observed at high concentarion (100 ㎍/mL or 100 µM). It is known that sodium-hydrogen ion exchange pumps (NHE1) decrease in expression in aging skin to maintain the acidic pH of the stratum corneum, and it is hypothesized that this decrease plays an important role in the impaired restoration of skin barrier function in aging skin. P. vulgaris extract and caffeic acid increased the expression of NHE1 in keratinocytes, increased the expression of natural moisturizing factor (NMF) precursor filaggrin and ceramide synthesis enzyme serine palmitoyl transferase (SPT). In addition, P. vulgaris and caffeic acid decreased the extracellular pH of keratinocytes, indicating a direct effect on skin pH regulation. Taken together, these results suggest that P. vulgaris and caffeic acid can regulate skin pH through NHE1 modulation, and may help to restore skin barrier function by increasing NMF and ceramide synthesis. These results show the possibility that honeysuckle and caffeic acid can have a positive effect on skin health, and can be the basis for the development of new skin protection products using them.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.43 no.2
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• pp.87-92
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• 2017

In this study, we investigated the effect of Petasites japonicus extract on the cytotoxicity and cytoprotective effects against cadmium for cosmetics use. We measured the protein expression of apoptosis regulatory factor (Bcl-2 and procaspase-3) after treatment of Petasites japonicus extract in the cadmium-induced keratinocyte. As a result, high cell viabilities above 98% were observed in the all treated concentrations except at $200{\mu}g/mL$ of Petasites japonicus extract in keratinocytes with cadmium-induced damages. In keratinocytes with cadmium-induced damages, Bcl-2 and procaspase-3 protein expression increased in the experimental group treated with Petasites japonicus extract. Also HaCaT cells resulted in cleavage of PARP protein at 12 h post-cadmium exposure. Western blot analysis and relative density of the bands suggested that pretreatment of cells with Petasites japonicus extract inhibited cadmium-mediated cleavage of PARP. These results suggest that Petasites japonicus extract can be used as the cosmetic ingredients for cytoprotective effect.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.33 no.1 s.60
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• pp.17-22
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• 2007

In this study, we investigated the effects of Sedum sarmentosum extract on the expression of hyaluronan synthase (HAS) genes and hyaluronan (HA) production in HaCaT keratinocytes. We also assessed water content (electrical capacitance) and transepidermal water loss (TEWL) in human skin after topical treatment with Sedum sarmentosum extract. Sedum sarmentosum extract increased expression of HAS-2 and HAS-3 genes in HaCaT cells, when assayed by real-time reverse-transcriptase polymerase chain reactions (RT-PCR). Sedum sarmentosum extract induced HA production in HaCaT cells, when determined by enzyme-linked immunosorbent assay (ELISA). Finally, treatment of Sedum sarmentosum extract on human skin increased the skin hydration and decreased TEWL when measured using Corneometer and Tewameter. Our study suggests that Sedum sarmentosum extract should be a very useful cosmetic ingredient, as a skin moisturizer.