• Toxicological Research
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• v.26 no.1
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• pp.61-66
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• 2010

Retinoids have many beneficial effects on dermatological applications. But, retinoids cause skin irritation. In this study, the safety of retinoids was clarified via both primary skin irritation test in rabbits and sensitization study using an integrated model for the differentiation of chemical-induced allergic and irritant skin reaction (IMDS), an alternative method to sensitization test. The effects of retinoids on the change of ultraviolet A (UVA)-induced matrix metalloproteinase-1 (MMP-1) in human skin fibroblasts and the modulation of type-1 pN collagen synthesis in hairless mice were examined to clarify the anti-wrinkle effects. Alltrans retinol (t-ROL) and its derivative, all-trans retinoic acid (t-RA), showed mild skin irritation but did not induce the sensitization. t-ROL and t-RA exerted anti-wrinkle effects by inhibiting the UVA-induced MMP-1 in human skin fibroblasts and increasing the type-1 pN collagen synthesis in hairless mice. These findings suggest that retinoids do not induce the allergy, and show anti-wrinkle effects by decreasing MMP-1 activation and increasing collagen synthesis.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.27 no.1
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• pp.29-42
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• 2001

We had prepared MLV liposome with Hibiscus Esculentus Ext.(HEE) which have fluorescent light in order to evaluate its percutaneous absorption about hairless rat skin. Then we investigated particle size of MLV using confocal laser scanning microscope(CLSM) and transmission electron microscope(TEM), respectively. Stability of MLV liposome and penetration of MLV liposome to hairless rat skin was measured by CLSM. As a result of experiments, MLV was globular shape and the rage of particle size was 0.3-0.5$\mu\textrm{m}$ mostly. Cream-type MLV had high stability comparatively. When we treated with MLV to rat skin, skin penetration was enhanced, especially, the optimum concentration of MLV on penetration to rat skin was 10%. Optimum penetration time was 6hr-12hr. And MLV-type HEE was more effective on percutaneous absorption than HEE-cream or liposome-type HEE.

• Archives of Pharmacal Research
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• v.28 no.4
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• pp.458-462
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• 2005

The water content of skin was determined using a FT near infrared (NIR) spectrometer. NIR diffuse reflectance spectra were collected from hairless mouse, in vitro, and from human inner arm, in vivo. It was found that the variation of NIR absorbance band 1450 nm from OH vibration of water and 1940 nm from the combination involving OH stretching and OH deformation, depending on the absolute water content of separated hairless mouse skin, in vitro, using the FT NIR spectrometer. Partial least squares regression (PLSR) was applied to develop a calibration model. The PLS model showed good correlation. For practical use of the evaluation of human skin moisture, the PLS model for human skin moisture was developed in vivo on the basis of the relative water content of stratum corneum from the conventional capacitance method. The PLS model predicted human skin moisture with a standard errors of prediction (SEP) of 3.98 at 1130-1830 nm range. These studies showed the possibility of a rapid and nondestructive skin moisture measurement using FT NIR spectrometer.

• Archives of Pharmacal Research
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• v.19 no.3
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• pp.183-190
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• 1996

There are a wide variety of semi-solid ointments used for healing the skin diseases, whose therapeutic and skin penetration abililties may greatly differ from one another depending on the compositions of ointment vehicles. A computer optimization technique was applied to obtain the optimum formula of o/w type ointment giving the in vitro maximum absorption rate through hairless rat skin membrane. Some of the formulations were selected to find out a relationship between skin penetration of ointment and its Theological characteristics. The experimental value of absorption rate obtained from the ointment by optimum formula agreed well with the theoretical value obtained from a polynomial regression analysis, Three kinds of ointments selected among 15 formulations were obtained with a concentric cylinder type rheometer (Model; Rheolab SM-HM Physica, Germany) at 20, 30, 40 and $50^{\circ}C$ for rheograms of rhelolgical properties of o/w type ointments. As the temperature was raised, all products showed a decrease in both shear stress and yield values. The higher skin penetration, the lower shear stress showed.

• Proceedings of the SCSK Conference
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• 1996.07a
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• pp.52-67
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• 1996

새로운 노화방지 물질로 개발한 3-APPA가 노화에 의해 야기되는 여러 변화들, 특히 세포 증식, 유전자 수준 및 단백질 수준에서의 collagen의 생합성 변화, 면역조직화학염색을 이용한 collagen 생합성의 변화등을 세포배양 및 동물실험을 통하여 측정하였다. MTT assay를 이용한 인체 피부 섬유아세포의 증식 실험에서 3-APPA는 무처치군에 비교해서 최고 2배의 섬유아세포 증식 효능을 나타내었으며, $^3$[H]-proline incorporation 방법을 이용한 단층세포 배양 및 3차원 dermal equivalent 섬유아세포 배양에서 무처치군 및 vitamin C 처리군에 비해 최고 1.5배의 collagen 생합성 증가를 나타내었다. 그러나 type I alpha-procollagen mRNA expression에는 영향을 미치지 않는 것으로 나타났다. H&E 염색을 이용한 hairless mice의 피부에 대한 형태학적 변화 및 type I pM procollagen antibody를 이용한 면역조직화학염색에서, 3-APPA는 collagen 생합성을 증가시키는 것으로 나타났다. 이상의 결과에서 3-APPA는 섬유아세포 배양 및 hairless mouse를 이용한 실험에서 피부 섬유아세포 증식을 촉진시키며 collagen 생합성을 증가시켜 피부노화를 억제 할 수 있는 물질임을 밝혔다.

• Proceedings of the Korean Society of Life Science Conference
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• 2005.09a
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• pp.70-70
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• 2005

• Proceedings of the PSK Conference
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• 2000.10a
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• pp.256.2-257
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• 2000

• Preventive Nutrition and Food Science
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• v.17 no.4
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• pp.245-253
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• 2012

Collagen tripeptide (CTP) is a functional food material with several biological effects such as improving dry skin and wound and bone fracture healing. This study focused on the anti-photoaging effects of CTP on a hairless mouse model. To evaluate the effects of CTP on UVB-induced skin wrinkle formation in vivo, the hairless mice were exposed to UVB radiation with oral administration of CTP for 14 weeks. Compared with the untreated UVB control group, mice treated with CTP showed significantly reduced wrinkle formation, skin thickening, and transepidermal water loss (TEWL). Skin hydration and hydroxyproline were increased in the CTP-treated group. Moreover, oral administration of CTP prevented UVB-induced MMP-3 and -13 activities as well as MMP-2 and -9 expressions. Oral administration of CTP increased skin elasticity and decreased abnormal elastic fiber formation. Erythema was also decreased in the CTP-treated group. Taken together, these results strongly suggest that CTP has potential as an anti-photoaging agent.

• Korean Journal of Food Science and Technology
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• v.29 no.2
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• pp.355-361
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• 1997

This study was carried out to investigate the acute cutaneous enzymatic antioxidant activity of green tea extracts (GTE) on hairless mice skin after a signal exposure to ultraviolet B radiation. GTE has been in corporated at concentration of 5, 25, 50 and $100\;{\mu}g$ into hairless mice skin. Under exposure conditions of $1.0\;joule/cm^{2}$, impairment of cutaneous enzymatic activity was observed. Catalase and glutathione reductase were significantly influenced in dose-dependent manner by GTE, however glutathione peroxidase and superoxide dismutase were not affected. To measure inhibition effect of the GTE on lipoxygenase. $50\;{\mu}g$ GTE extract was added in vitro to arachidonis acid. GTE showed higher inhibition effect on 5-hydroxyeicosatetraenoic acid (HETE) and 8-HETE than metalolic products of 12- or 15-HETE. The addition of 5, 25, 50 and $100\;{\mu}g$ GTE inhibited the metabolite formation of 5-HETE by 32, 52, 62 and 80%, respectively, and the metabolite formation of 8-HETE by 36, 47, 70 and 84%, respectively.

• Journal of the Korean Society of Food Science and Nutrition
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• v.39 no.1
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• pp.42-46
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• 2010

This study was performed to investigate anti-wrinkle effects of Acanthopanax senticosus (AS) on ultraviolet B (UVB)-induced photoaging with wrinkle formation. AS extract showed higher DPPH radical scavenging activity (3 ${\mu}g/mL$ as $IC_{50}$) and collagenase inhibition (1.52 mg/mL as $IC_{50}$) than those of ascorbic acid (50 ${\mu}g/mL$ and 2.17 mg/mL, respectively). Cell proliferation and type I pN collagen synthesis were increased by 11.4% and 96.4%, respectively, compared with non treatment control. In vivo, SKH-1 hairless mice were administrated AS 400 mg/kg for 10 weeks with UVB irradiation three times a week. After 10 weeks, a visual assessment and replica assay were performed on each mouse. According to visual assessment of close-up photos and skin replica, oral administration of A. senticosus affected on inhibition of wrinkle formation caused by UVB irradiation on the skin of mice as compared to the vehicle treated control mice. These results indicated that A. senticosus could protect skin wrinkle formation caused by collagen synthesis of fibroblast cells and photo-irradiation of UVB in hairless mice.