• Bulletin of the Korean Chemical Society
• /
• 제29권8호
• /
• pp.1569-1571
• /
• 2008

• 대한수의학회지
• /
• 제63권4호
• /
• pp.32.1-32.4
• /
• 2023

Granular cell tumor was described in the testis of two rabbits. Testis from each rabbit was surgically removed and submitted for histopathological diagnosis. Both testes were about 2.0 cm in diameter, firm, and tan. Microscopically, testicular mass consisted of compact sheets of round to polygonal and occasional spindle-shaped cells. The neoplastic cells contain a large amount of eosinophilic granular material in the cytoplasm. The cytoplasmic eosinophilic granules were positive for periodic acid Schiff stain. Immunohistochemically, the neoplastic cells were immunoreactive to Melan-A and vimentin. Based on these results, the testicular mass was diagnosed as a granular cell tumor.

• 대한병리학회지
• /
• 제52권6호
• /
• pp.416-419
• /
• 2018

We describe a case of a 61-year-old Korean man who was diagnosed with renal cell carcinoma that was discovered on abdominopelvic computed tomography obtained after the patient complained of back pain. A radical nephrectomy was performed, and the surgical specimen showed a relatively well-circumscribed and yellowish lobulated hard mass. Microscopically, the tumor showed sheets and nests of hypercellular pleomorphic cells with thick fibrous septation, frequent mitoses, and areas of adrenal cortical-like tissue. Immunohistochemical staining revealed that the tumor cells were positive for inhibin-${\alpha}$, vimentin, synaptophysin, and melan A. It also revealed that the tumor cells were negative for pan-cytokeratin, epithelial membrane antigen, paired box 8, ${\alpha}$-methylacyl-coenzyme A racemase, CD10, cytokeratin 7, carbonic anhydrase 9, c-Kit, renal cell carcinoma, transcription factor E3, human melanoma black 45, desmin, smooth muscle actin, S-100, chromogranin A, CD34, anaplastic lymphoma kinase, and integrase interactor 1. Based on these histopathological and immunohistochemical findings, we diagnosed the tumor as intrarenal adrenocortical carcinoma arising in an adrenal rest. Several cases of intrarenal adrenocortical carcinoma have been reported, although they are very rare. Due to its poor prognosis and common recurrence or metastasis, clinicians and pathologists must be aware of this entity.

• 한국자원식물학회지
• /
• 제26권5호
• /
• pp.526-532
• /
• 2013

본 연구에서는 동해안에서 채집된 88종의 해조류에 대하여 미백제로서 응용 가능성을 알아보기 위해 멜라닌 생성에 미치는 영향을 in vitro 실험을 통해 알아보았다. Melan-a 세포에 해조류 추출물을 처리하여 멜라닌 양을 측정한 결과, 고리매, 미역쇠, 왜모자반, 감태, 톳추출물에서 멜라닌 생성이 감소되었으며, 특히 미역쇠추출물을 처리하였을 때 가장 유효하게 농도의존적으로 멜라닌 생성이 감소되었다. 멜라닌 생성 억제 효과가 tyrosinase 활성 저해와 관련 있는지를 확인한 결과, 약한 활성을 가지지만 직접 작용하여 활성을 저해하지는 않으면서, 세포 내의 tyrosinase 활성을 농도의존적으로 저해하였다. 이는 세포 내 tyrosinase 활성저해가 직접적이 아닌 다른 기전에 의해 일어난다는 것을 의미하며, 그 기전 중의 하나인 ${\alpha}$-glucosidase활성을 측정한 결과 농도의존적으로 활성을 저해하였으며, 세포 내 tyrosinase 활성 저해와 높은 상관도를 보임을 확인하였다. 즉 미역쇠추출물은 N-linked glycoprotein인 tyrosinase의 glycosylation을 억제하여 tyrosinase의 세포 내 이동이나 활성을 억제할 수 있음을 알 수 있었다. 결론적으로, 미역쇠추출물은 피부 미백에 유효한 활성을 나타내는 천연 유용자원으로 활용할 가치가 있는 것으로 사료된다.

• 대한약학회:학술대회논문집
• /
• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
• /
• pp.92.2-93
• /
• 2003

This study with the object of reported to depigment agent, oxyresveratrol derivative, compound DMPB. Compound DMPB with a two methoxy groups and modified connection chain. It was synthesized in accordance with a simple combination process. Compound DMPB exhibits depigmentaion ability on ultraviolet B-induced hyperpigmention of the brown guinea pig skin. In addition, this Compound exhibited 30% inhibitory effect of melanin generation without cell toxicity as a result of the treatment with 100 ppm in melan-a cells. (omitted)

• 대한화장품학회:학술대회논문집
• /
• 대한화장품학회 2003년도 IFSCC Conference Proceeding Book II
• /
• pp.174-183
• /
• 2003

To obtain effective and safe topical depigmenting agents, we synthesized hydroxybenzoates, alkoxybenzoates, and 3,4,5-trimethoxycinnamate containing a thymol moiety and screened then for high-level inhibitory activity against melanin synthesis. Among them, 5-methyl-2-(methylethyl)phenyl (2Ε)-3-(3,4,5-trimethoxyphenyl)prop-2-enoate (Melasolv)$^{TM}$ 4h, showed the most potent depigmenting effect ($IC_{50}$/ = 10$\mu$M) with low cytotoxicity ($IC_{50}$/ = 200$\mu$M). To find the inhibition mechanism of our candidate, various in vitro tests were performed such as DPPH assay, tyrosinase activity in mushroom or in culture cell and expression of tyrosinase, TRP-l and TRP-2. The result of this study suggested that 4h inhibited melanin synthesis by reducing the expression of tyrosinase and TRP-l at the transcriptional level in melan-a melanocytes.s.

• 대한화장품학회지
• /
• 제31권1호
• /
• pp.17-23
• /
• 2005

본 연구자들은 백출의 메탄올 추출물로부터 분리, 정제한 selina-4(14), 7(11)-dien-8-one (Selina)이 B16 멜라노마 세포에 대하여 매우 강력한 미백효과가 있음을 밝혀내었다. 본 연구에서는 Selina의 non-tumorigenic melanocyte cell line인 Melan-a 세포에 대한 작용 메카니즘에 대한 보고를 하고자 한다. 덧붙여 Selina를 함유하고 있는 제품의 임상효과도 연구하였다. Selina는 $10 {\mu}g/mL$의 농도에서 세포독성을 보이지 않으면서 Melan-a 세포의 멜라닌 합성을 $50\%$ 저해하였다. 또한 $10 {\mu}g/mL$의 Selina의 처리에 의하여 타이로시네이즈의 활성이 $60\%$ 감소시키지만 타이로시네이즈에 대한 직접적인 저해활성은 없는 것으로 밝혀졌다. 이러한 Selina의 작용 기작을 밝히기 위하여 연구자들은 타이로시네이즈, TRP-1, TRP-2의 3가지 유전자의 mRNA 수준과 단백질의 발현량을 RT-PCR과 western blotting을 이용하여 연구하였다. 그 결과 $10 {\mu}g/mL$의 Selina 처리에 의하여 타이로시네이즈의 mRNA와 단백질 양은 현저히 감소하였지만 TRP-1과 TRP-2의 mRNA 및 단백질 양에는 변화가 없었다. 이러한 결과는 Selina가 그 미백효과를 주로 타이로시네이즈의 발현조절에 의하여 나타낸다는 것을 알 수 있다. $0.2\%$의 Selina를 함유하는 화장품 제형을 이용, 7주간 20명의 피시험자를 대상으로 한 임상시험에서도 어떠한 부작용도 없이 통계적으로 유의한(p<0.05) 수준의 미백효과를 볼 수 있었다. 이상의 결과를 종합해 볼 때 Selina는 깨끗하고 밝은 피부를 위한 유용하면서도 안전한 신규 미백 원료임을 알 수 있다.

• Journal of Microbiology and Biotechnology
• /
• 제16권5호
• /
• pp.667-672
• /
• 2006

Tyrosinase is an enzyme that catalyzes the biosynthetic pathway of melanin pigments participating in the coloring of skin, hair, and eyes, and is widely distributed in nature. The inhibitory compounds of tyrosinase have been extensively used as a cosmetic agent with a skin-whitening effect. In this paper, several plant extracts were screened using Melan-a cells for the melanin biosynthesis inhibition activity, and Idesia polycarpa was selected. A melanin biosynthesis inhibitor was isolated from I. polycarpa fruits by activity-guided fractionation, and the inhibitor was identified as 6-hydroxy-2-[[[(1-hydroxy-6-oxo-2-cyclohexenl-yl)carbonyl]oxy]methyl]phenyl$\beta$-D-glucopyranoside (idescrapin) by comparing it with reported spectral data. Idescarpin $(IC_{50}=8{\mu}g/ml)$ reduced melanin content compared with the vehicle. In addition, the inhibitory activity of idescarpin for melanin synthesis is mediated by decreasing tyrosinase protein rather than directly inhibiting the tyrosinase activity. These results suggest that idescarpin isolated from I. polycarpa fruits may be used as a skin-whitening agent.

• Biomolecules & Therapeutics
• /
• 제31권4호
• /
• pp.466-472
• /
• 2023

Exon skipping is an efficient technique to inhibit specific gene expression induced by a short-sequence peptide nucleic acid (PNA). To date, there has been no study on the effects of PNA on skin pigmentation. In melanocytes, the tripartite complex is responsible for the transport of mature melanosomes from the nucleus to the dendrites. The tripartite complex is composed of Rab27a, Mlph (Melanophilin), and Myosin Va. Defects in the protein Mlph, a melanosome transport-related protein, are known to cause hypopigmentation. Our study shows that Olipass peptide nucleic acid (OPNA), a cell membrane-permeable PNA, targets exon skipping in the Mlph SHD domain, which is involved in Rab27a binding. Our findings demonstrate that OPNA induced exon skipping in melan-a cells, resulting in shortened Mlph mRNA, reduced Mlph protein levels, and melanosome aggregation, as observed by microscopy. Therefore, OPNA inhibits the expression of Mlph by inducing exon skipping within the gene. These results suggest that OPNA, which targets Mlph, may be a potential new whitening agent to inhibit melanosome movement.

• KSBB Journal
• /
• 제19권3호
• /
• pp.169-173
• /
• 2004

홍경천 5 g과 메탄올 150 $m\ell$을 혼합하여 상온에서 12시간 추출한 시료를 체류시간에 따라 2부분으로 분류하였다. 이때의 이동상 조성은 다음과 같으며 물/메탄올; 90/10 - 30/70 (vol. %, 5분), 30/70 - 10/90 (vol.%, 15분), 분석용 컬럼 (3.9 ${\times}$ 25 cm, $C_{18}$, 15 $\mu\textrm{m}$)에 세공크기가 300 $\AA$인 충진물을 충전하여 사용하였다. 홍경천 추출물을 이용한 미백성능 측정에서는 알부틴에 비해 효율적인 결과를 얻지 못했지만, 체류 시간에 따라 2부분으로 분리하여 각 부분에 대한 미백성능 검사 결과, melanin-a를 이용하여 in-vivo에서 수행한 멜라닌 합성율 비교한 실험에서 10 ppm의 농도를 기준으로 하는 경우, 알부틴의 45.6%보다 1.0∼4.0분 동안 수집한 #1과, 10.4∼17.6분 동안 수집한 #2가 각각 58.6%, 60%로 우수하게 멜라닌 합성을 저해하는 것을 알 수 있었다.