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Suh DH, Oh H, Lee SJ, Kim HJ, Ryu HJ. Relationship between acne and the use of cosmetics: Results of a questionnaire study in 539 Korean individuals. J Cosmet Dermatol 2020; 20:2172-2178. [PMID: 33206430 DOI: 10.1111/jocd.13853] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 09/16/2020] [Accepted: 11/09/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND Acne vulgaris is one of the most common dermatological diseases, and it is known that various factors are related to triggering this condition in a patient. In particular, although the use of cosmetics is thought to be associated with the onset of a patient developing acne, there are few studies that have been conducted to date on this disease and its related factors. METHODS To begin with, a total of 539 patients with acne vulgaris, who visited three dermatologic clinics in Korea, were asked to complete a questionnaire regarding their condition in relation to clinical features and exacerbating factors, including the use of cosmetics. The patients all provided an accurate acne treatment history as well. RESULTS Among the respondents, 38.1% of patients who failed treatment answered that the condition of their acne was worsened by the continued use of cosmetics, which was significantly higher than 26.3% of the surveyed treatment-naive patients (P < .05). In this relation, double cleansing (cleansing twice using oil and water-based cleanser) and the number of cosmetics in use were also noted in higher numbers than in the treatment-failure patients. As noted, the liquid-type foundation and concealer were frequently used in this group. CONCLUSIONS This study showed the influence of cosmetics, especially in acne patients with a history of treatment failures. These results also show differences according to specific cosmetic types and formulations. Therefore, overall dermatologists should consider advising about cosmetic use to acne patients along with medical treatment options for the patients with acne.
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Jung YJ, Ro YS, Ryu HJ, Kim JE. Therapeutic effects of a new invasive pulsed-type bipolar radiofrequency for facial erythema associated with acne vulgaris and rosacea. J COSMET LASER THER 2020; 22:205-209. [PMID: 33650938 DOI: 10.1080/14764172.2021.1880599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Facial erythema from rosacea and acne is one of the most common problems encountered in dermatologic clinics. Effective therapeutic interventions for persistent erythema, which can cause patients frustration and psychological distress, are needed. The aim of this study was to evaluate the efficacy and safety of an invasive short pulsed-type bipolar radiofrequency device (IPBRF) for the treatment of intractable facial erythema. Thirty-one patients who had been diagnosed with rosacea or acne vulgaris and combined erythema underwent at least two IPBRF treatment sessions (maximum: 5) at 2-week intervals. Treatment outcomes were evaluated by investigator global assessment (IGA) based on clinical photographs, patient global assessment (PGA) score, and skin biophysical parameters including erythema index (EI), melanin index (MI), and transepidermal water loss (TEWL). Most patients showed significant clinical improvement. IGA scores for erythema, pores and smoothness improved after treatment. PGA also showed a trend toward improvement. Mean EI was significantly improved after the second treatment compared to baseline, which maintained until the study period. MI and TEWL showed a tendency toward improvement. There were no serious adverse events reported during the study. IPBRF led to rapid clinical improvement in facial erythema associated with rosacea and acne vulgaris and could be an effective and safe treatment option.
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Ryu HJ, Park JH, Choi M, Jung JH, Han K, Kwon DY, Kim DH, Park YG. Parkinson's disease and skin cancer risk: a nationwide population-based cohort study in Korea. J Eur Acad Dermatol Venereol 2020; 34:2775-2780. [PMID: 32289877 DOI: 10.1111/jdv.16462] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Accepted: 03/31/2020] [Indexed: 12/14/2022]
Abstract
BACKGROUND Previous studies have reported that patients with Parkinson's disease (PD) have a significantly lower risk of cancer. Studies reporting prevalence of skin cancers in Parkinson's disease mostly involve Caucasians. OBJECTIVE A nationwide population-based study was conducted to determine the risk of skin cancer in patients diagnosed with PD in Korea. METHODS Data obtained from National Health Insurance Claims records were used to retrieve information about 70 780 patients with newly diagnosed PD between January 2010 and December 2015. The control group included 353 900 sex- and age-matched patients without PD. In this nationwide population-based cohort study, we investigated the association between PD and skin cancer. RESULTS The overall hazard ratio (HR) of skin cancers in patients with PD was 1.169 (95% CI, 1.005-1.359) compared with non-PD group. Among patients with PD, males aged above 65 had a 2.8-fold increase in the risk for melanoma development than the non-PD group (HR, 2.825; 95% CI, 1.395-5.721). In addition, female PD patients aged above 65 years showed a 1.3-fold increase in non-melanoma skin cancer risk than the non-PD group (HR, 1.305; 95% 1.073-1.589). CONCLUSION Compared with the general population, Korean patients diagnosed with PD had a greater risk of skin cancer. Especially, male patients aged 65 years and above, and diagnosed with PD had a significant risk of melanoma development compared with control.
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Kim CM, Kim BY, Hye Suh D, Lee SJ, Moon HR, Ryu HJ. The efficacy of powdered polydioxanone in terms of collagen production compared with poly-L-lactic acid in a murine model. J Cosmet Dermatol 2019; 18:1893-1898. [PMID: 30809959 DOI: 10.1111/jocd.12894] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 08/01/2018] [Accepted: 01/22/2019] [Indexed: 01/18/2023]
Abstract
BACKGROUND There are many collagen-stimulating fillers, including calcium hydroxyapatite, polycaprolactone (PCL), and poly-L-lactic acid (PLLA), and other materials have been tested. Polydioxanone (PDO) has recently been used as absorbable thread-lifting material due to its collagen-forming effects. PDO in powdered form is expected to be a good material for collagen-producing fillers. OBJECTIVES To evaluate the collagen-producing effects of powdered PDO injection compared with PLLA injection in a murine model. MATERIALS AND METHODS Powdered PDO mixed with sodium carboxymethyl cellulose, PLLA, and phosphate-buffered saline was injected on dorsal skin of 8-week-old rat. Tissue samples were obtained 1, 2, and 12 weeks after the procedures for histopathologic review and for real-time PCR to quantify collagen and tissue growth factors. RESULTS Both PLLA and powdered PDO injections induced granulomatous reactions. Collagen type 1, collagen type 3, TGF-β1, TGF-β2, and TGF-β3 showed increases 2 weeks after injection but decreased 12 weeks after injection for both powdered PDO and PLLA. CONCLUSION Our results suggested that powdered PDO injection induces collagen formation more effectively than PLLA injection. Therefore, PDO can be a good option for forming collagen.
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Lee JM, Ryu SI, Kim JI, Park S, Kim IH, Park MS, Ryu HJ. Contribution of Container Types on Cosmetics Contamination. Ann Dermatol 2019; 31:588-590. [PMID: 33911656 PMCID: PMC7992568 DOI: 10.5021/ad.2019.31.5.588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 04/15/2019] [Accepted: 04/29/2019] [Indexed: 11/22/2022] Open
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Ryu HJ, Park JH, Ryu SI, Kim BY, Chun SH. Successfully Treated Severe Acne Using Selective Electrothermolysis in a Patient with Nephrotic Syndrome. Ann Dermatol 2019; 31:75-77. [PMID: 33911543 PMCID: PMC7992709 DOI: 10.5021/ad.2019.31.1.75] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 11/16/2017] [Accepted: 01/04/2018] [Indexed: 01/24/2023] Open
Abstract
Acne is very common in adolescents and young adults. Although there are various conventional treatment modalities, some patients are prone to side effects and need alternative options. A 22-year-old male patient who were treated with high dose systemic steroid for his nephrotic syndrome, encountered severe acne on his face and neck. Since the patient's medical condition was unable to administer systemic agent, he was treated with the selective electrothermolysis device. The sebaceous gland targeting treatment by selective electrothermolysis with microneedle radiofrequency device, had minimal adverse effect and the skin lesions improved dramatically. The patient was satisfied and did not want further treatment.
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Suh DH, Park JH, Kim BY, Lee SJ, Moon JH, Ryu HJ. Double stacking cryolipolysis treatment of the abdominal fat with use of a novel contoured applicator. J COSMET LASER THER 2018; 21:238-242. [PMID: 30285505 DOI: 10.1080/14764172.2018.1525742] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Background: Cryolipolysis is a noninvasive method for the selective reduction of subcutaneous fat. The abdomen and flank area are most commonly treated sites and now the treatment efficacy became the important issue. Objectives: To evaluate the effectiveness and safety of double stacking cryolipolysis treatment with the novel contoured applicator for abdominal fat reduction. Materials and methods: 12 healthy Korean were treated using cryolipolysis contact device. The device was applied on participant's left lower abdomen. Performance was held for 35 minutes and immediately repeated the second performance. The right abdomen was left untreated. Participants were examined with high resolution ultrasound and the depth of subcutaneous fat layer was measured initially and 8 weeks after the sessions. Any adverse events were assessed during the entire study period. Results: The subjective reduction of abdominal fat was noted in most participants. No serious adverse events was reported. Reduction of subcutaneous fat layer depth was confirmed in high resolution ultrasound after 8 weeks of treatment. Conclusion: The results of this study indicate that abdominal fat can be reduced effectively by the novel cryolipolysis applicator. With subjective satisfaction of participants our study shows that double stacking treatment appears safe and well tolerated with enhanced treatment outcomes.
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Kim BY, Moon HR, Ryu HJ. Comparative efficacy of short-pulsed intense pulsed light and pulsed dye laser to treat rosacea. J COSMET LASER THER 2018; 21:291-296. [DOI: 10.1080/14764172.2018.1528371] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kim CM, Jeong SH, Lee H, Ryu HJ, Son SW. Silver nanoparticles induce Egr-1-dependent psoriasin expression via the ERK and p38 pathways. Clin Exp Dermatol 2018; 44:390-396. [PMID: 30251408 DOI: 10.1111/ced.13758] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/16/2018] [Indexed: 12/14/2022]
Abstract
BACKGROUND Silver nanoparticles (Ag-NPs) can prevent bacterial infection and improve cutaneous wound healing owing to their antimicrobial activity. However, the mechanism of their antimicrobial activity is poorly understood. AIM To determine the mechanistic relationship between Ag-NP treatment and expression of psoriasin. METHODS Human epidermal keratinocytes, neonatal (HEKn) were used. Psoriasin mRNA expression was measured by reverse transcription PCR and real-time PCR. Western blotting was performed to verify expression of early growth response-1 (Egr-1) and psoriasin, and phosphorylation of mitogen-activated protein kinase (MAPK). Psoriasin promoter activity by Egr-1 was detected by a luciferase assay. RESULTS Treatment of HEKn with Ag-NPs induced psoriasin mRNA and protein expression. Upregulation of psoriasin promoter activity was also observed in the luciferase assay. Ag-NPs increased Egr-1 expression, promoter activity and nuclear translocation in HEKn. Psoriasin luciferase activity was increased in HEKn transfected with Egr-1 pcDNA 3.1. Ag-NPs activated MAPK pathways including the extracellular signal-regulated kinase (ERK), p38, and c-Jun-N-terminal kinase (JNK) pathways. The upregulation of Egr-1 expression by Ag-NP stimulation was inhibited by ERK and p38 inhibitors, but not by a JNK inhibitor. Psoriasin expression was reduced in Egr-1 small interfering RNA-transfected HEKn. CONCLUSIONS Ag-NP treatment induces upregulation of psoriasin expression through Egr-1 expression. We suggest that the ERK and p38 pathways are involved in Egr-1-dependent psoriasin expression.
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Moon HR, Park TJ, Ro KW, Ryu HJ, Seo SH, Son SW, Kim IH. Pigmentation of basal cell carcinoma is inversely associated with tumor aggressiveness in Asian patients. J Am Acad Dermatol 2018; 80:1755-1757. [PMID: 30003992 DOI: 10.1016/j.jaad.2018.06.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 06/18/2018] [Accepted: 06/28/2018] [Indexed: 11/30/2022]
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Shin JJ, Park TJ, Kim BY, Kim CM, Suh DH, Lee SJ, Moon HR, Ryu HJ. Comparative effects of various absorbable threads in a rat model. J COSMET LASER THER 2018; 21:158-162. [DOI: 10.1080/14764172.2018.1493511] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Chun SH, Kim BY, Park JH, Kim IH, Ryu HJ. Simultaneous Presentation of Trichilemmal Carcinoma and Syringocystadenoma Papilliferum within a Nevus Sebaceous. Ann Dermatol 2018; 30:368-370. [PMID: 29853758 PMCID: PMC5929961 DOI: 10.5021/ad.2018.30.3.368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 05/08/2017] [Accepted: 06/05/2017] [Indexed: 11/08/2022] Open
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Ryu WI, Lee H, Bae HC, Jeon J, Ryu HJ, Kim J, Kim JH, Son JW, Kim J, Imai Y, Yamanishi K, Jeong SH, Son SW. IL-33 down-regulates CLDN1 expression through the ERK/STAT3 pathway in keratinocytes. J Dermatol Sci 2018. [DOI: 10.1016/j.jdermsci.2018.02.017] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Suh DH, Park JH, Jung HK, Lee SJ, Kim HJ, Ryu HJ. Cryolipolysis for submental fat reduction in Asians. J COSMET LASER THER 2017; 20:24-27. [DOI: 10.1080/14764172.2017.1368564] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Chun SH, Kim BY, Kim CM, Park JB, Ryu HJ. A Case of Wolf's Isotopic Response Presenting as Bullous Pemphigoid. Ann Dermatol 2017; 29:499-500. [PMID: 28761305 PMCID: PMC5500722 DOI: 10.5021/ad.2017.29.4.499] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 07/25/2016] [Accepted: 08/04/2016] [Indexed: 11/08/2022] Open
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Suh DH, Kim CM, Lee SJ, Kim H, Yeom SK, Ryu HJ. Safety and efficacy of a non-contact radiofrequency device for body contouring in Asians. J COSMET LASER THER 2017; 19:89-92. [DOI: 10.1080/14764172.2016.1256486] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Ryu HJ, Lee JM, Jang HW, Park HC, Rhyu IJ, Kim IH. Morphologic Changes of Zebrafish Melanophore after Intense Pulsed Light and Q-Switched Nd:YAG Laser Irradiation. Ann Dermatol 2016; 28:711-717. [PMID: 27904270 PMCID: PMC5125952 DOI: 10.5021/ad.2016.28.6.711] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 03/28/2016] [Accepted: 03/30/2016] [Indexed: 11/17/2022] Open
Abstract
Background Recently, the pulse-in-pulse mode of intense pulsed light (IPL) has been used increasingly for the treatment of melasma. Objective To observe the morphologic changes in the melanophore in adult zebrafish after irradiation with conventional and pulse-in-pulse IPL and Q-switched Nd:YAG (QSNY) laser. Methods Adult zebrafish were irradiated with conventional and pulse-in-pulse mode of IPL. The conditions for conventional IPL were 3 mJ/cm2, 560 nm filter, and pulse widths of 7, 20, and 35 msec. The pulse-in-pulse conditions were 3 mJ/cm2 and on-time 1/off-time 2. The QSNY laser was used with the settings of 1,064 nm, 0.4 J/cm2, a 7 mm spot size, and one shot. Specimens were observed using a light microscope, a transmission electron microscope (TEM), a scanning electron microscope (SEM) and a confocal microscope. Results After conventional IPL irradiation with a 7 msec pulse width, melanophore breakage was observed using light microscopy. Under TEM, irradiation with conventional IPL for 7 msec and pulse-in-pulse IPL induced melanophore thermolysis with vacuolization. However, changes in the melanophore were not observed with 35 msec IPL. Under SEM, unlike the control and QSNY groups, IPL-irradiated zebrafish showed finger-like fusion in the protein structure of scales. Specimens examined by a confocal microscope after conventional IPL irradiation showed a larger green-stained area on TUNEL staining than that after pulse-in-pulse mode IPL irradiation. Conclusion Zebrafish irradiated with long pulse-IPL showed no morphologic changes using light microscopy, while morphological changes in melanophores were evident with use of TEM. Pulse-in-pulse mode IPL caused less damage than conventional IPL.
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Jang HW, Chun SH, Park HC, Ryu HJ, Kim IH. Comparative study of dual-pulsed 1064 nm Q-switched Nd:YAG laser and single-pulsed 1064 nm Q-switched Nd:YAG laser by using zebrafish model and prospective split-face analysis of facial melasma. J COSMET LASER THER 2016; 19:114-123. [PMID: 27911108 DOI: 10.1080/14764172.2016.1262958] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Recently dual-pulsed low-fluence 1064-nm Q-switched Nd:YAG (QSNY) laser has been developed for reducing complication during melasma treatment. OBJECTIVE Comparison of the efficacy and safety between dual-pulsed mode and single-pulsed mode for the treatment of melasma. MATERIALS AND METHODS In preclinical study, adult zebrafish were irradiated with dual-pulsed and single-pulsed mode. Changes of melanophore and cell death were assessed. In split-face clinical study, dual-pulsed and single-pulsed mode were irradiated on the left and right side of the face, respectively. L* value, clinical digital photos, modified Melasma Area and Severity Index (MASI) scores, and side effects were measured. RESULTS As compared to single-pulsed mode and dual-pulsed mode with longer intervals, zebrafish melanophore was cleared quickly at dual-pulsed mode with 80-μsec interval and 0.3 J/cm2 fluence. Dual-pulsed mode showed the least regeneration of melanophore at 4 weeks after irradiation and no cell death was observed with 80-μsec interval. Both pulse modes improved melasma significantly but modified MASI score and L* value were not significantly different between each other. Lesser pain and shorter duration of post-laser erythema were observed with dual-pulsed mode. CONCLUSION Dual-pulsed mode was as effective as single-pulsed mode for the treatment of melasma and revealed less side effects.
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Lee H, Ryu WI, Kim HJ, Bae HC, Ryu HJ, Shin JJ, Song KH, Kim TW, Son SW. TSLP Down-Regulates S100A7 and ß-Defensin 2 Via the JAK2/STAT3-Dependent Mechanism. J Invest Dermatol 2016; 136:2427-2435. [DOI: 10.1016/j.jid.2016.07.027] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 07/07/2016] [Accepted: 07/25/2016] [Indexed: 12/21/2022]
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Lee SJ, Suh DH, Lee JM, Song KY, Ryu HJ. Dermal Remodeling of Burn Scar by Fractional CO2 Laser. Aesthetic Plast Surg 2016; 40:761-8. [PMID: 27519176 DOI: 10.1007/s00266-016-0686-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 07/29/2016] [Indexed: 02/05/2023]
Abstract
BACKGROUND Ablative CO2 fractional lasers have recently been introduced for burn scar treatment because of pronounced clinical outcomes with fewer treatment sessions than nonablative fractional laser. OBJECTIVE This study was conducted to observe clinical as well as histologic changes of burn scars after treatment with CO2 fractional laser. MATERIALS AND METHODS Eleven patients (one female and 10 males, aged 31-59 years) with skin phototypes III to V with burn scars received 10 sessions of fractional CO2 laser treatments (UltraPulse(®) Encore; Lumenis, Santa Clara, CA, USA) over an average 5-week interval. Two passes were performed using the following parameters: deep FX mode, 12.5-30 mJ, with a density setting of 5-10 %. Clinical evaluations by three blinded dermatologists were obtained at baseline and at 6 months after the final treatment via photographs using the Vancouver scar scale (VSS). Skin biopsies were done on four patients before and after treatment. RESULTS All patients showed clinical improvement in their scars with significant decrease in VSS. Histologic findings showed the changes in the upper dermis with newly formed dermal papilla. This characteristic upper dermis change was presented as improvement in surface smoothness and skin tension clinically. Postinflammatory hyperpigmentation and itching sensation were the most common adverse effects. CONCLUSION Burn scar treatment by fractional CO2 laser is effective by forming new collagen fibers mainly in the upper dermis. LEVEL OF EVIDENCE IV This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .
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Lee SJ, Kim YJ, Park JB, Suh DH, Kwon DY, Ryu HJ. A case of motor neuropathy after cryolipolysis of the arm. J COSMET LASER THER 2016; 18:403-404. [DOI: 10.1080/14764172.2016.1191651] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Jang HW, Ryu HJ, Kim IH, Son SW. Segmental Neurofibromatosis with Visceral Neurofibromas. Ann Dermatol 2016; 28:253-4. [PMID: 27081279 PMCID: PMC4828395 DOI: 10.5021/ad.2016.28.2.253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 04/21/2015] [Accepted: 04/28/2015] [Indexed: 11/08/2022] Open
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Lee SJ, Jang HW, Kim H, Suh DH, Ryu HJ. Non-invasive cryolipolysis to reduce subcutaneous fat in the arms. J COSMET LASER THER 2016; 18:126-9. [DOI: 10.3109/14764172.2015.1114644] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Lee O, Lee SH, Jeong SH, Kim J, Ryu HJ, Oh C, Son SW. A quantitative study of nanoparticle skin penetration with interactive segmentation. Med Biol Eng Comput 2015; 54:1469-79. [PMID: 26589318 DOI: 10.1007/s11517-015-1405-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Accepted: 10/03/2015] [Indexed: 01/30/2023]
Abstract
In the last decade, the application of nanotechnology techniques has expanded within diverse areas such as pharmacology, medicine, and optical science. Despite such wide-ranging possibilities for implementation into practice, the mechanisms behind nanoparticle skin absorption remain unknown. Moreover, the main mode of investigation has been qualitative analysis. Using interactive segmentation, this study suggests a method of objectively and quantitatively analyzing the mechanisms underlying the skin absorption of nanoparticles. Silica nanoparticles (SNPs) were assessed using transmission electron microscopy and applied to the human skin equivalent model. Captured fluorescence images of this model were used to evaluate degrees of skin penetration. These images underwent interactive segmentation and image processing in addition to statistical quantitative analyses of calculated image parameters including the mean, integrated density, skewness, kurtosis, and area fraction. In images from both groups, the distribution area and intensity of fluorescent silica gradually increased in proportion to time. Since statistical significance was achieved after 2 days in the negative charge group and after 4 days in the positive charge group, there is a periodic difference. Furthermore, the quantity of silica per unit area showed a dramatic change after 6 days in the negative charge group. Although this quantitative result is identical to results obtained by qualitative assessment, it is meaningful in that it was proven by statistical analysis with quantitation by using image processing. The present study suggests that the surface charge of SNPs could play an important role in the percutaneous absorption of NPs. These findings can help achieve a better understanding of the percutaneous transport of NPs. In addition, these results provide important guidance for the design of NPs for biomedical applications.
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Kwon IH, Ahn HH, Ryu HJ, Rhyu IJ. Sudden appearance of black macules on palmar aspect of two university chemistry students. Int J Dermatol 2015; 55:e167-9. [PMID: 26518909 DOI: 10.1111/ijd.13081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 04/23/2015] [Accepted: 05/07/2015] [Indexed: 11/27/2022]
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