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1.
J Drugs Dermatol ; 23(7): 571-574, 2024 Jul 01.
Artículo en Inglés | MEDLINE | ID: mdl-38954614

RESUMEN

Despite the widespread interest in dermatology on TikTok, studies have shown most related videos are not produced by board-certified dermatologists (BCDs) or other health professionals. To see if this trend extended to sun protection, we examined TikTok videos associated with sun safety to determine the proportion produced by BCDs. From August 25, 2023, to August 27, 2023, investigators input the following hashtags into the TikTok search bar: #sunscreen, #sunprotection, #spf, #skincancer, and #skinprotection. The top 100 videos in each category were analyzed and categorized based on the content creator. Additionally, we assessed whether videos explicitly addressed skin of color (SOC). Of the analyzed videos, only 16.6% originated from BCDs. Beauty bloggers/bloggers were the most prevalent creators in this category (38.7%), followed by patients/consumers (33.7%). Only 2.8% of the videos pertained to SOC patients. This highlights a gap in the type of educational content generated by dermatologists on TikTok, with sun safety being a potential subject to target within social media. Additionally, the small representation of videos addressing SOC patients underscores the need for more diverse and inclusive educational skincare content on TikTok.J Drugs Dermatol. 2024;23(7):571-574. doi:10.36849/JDD.8179.


Asunto(s)
Medios de Comunicación Sociales , Protectores Solares , Humanos , Estudios Transversales , Protectores Solares/administración & dosificación , Medios de Comunicación Sociales/estadística & datos numéricos , Quemadura Solar/prevención & control , Dermatología , Grabación en Video , Luz Solar/efectos adversos , Pigmentación de la Piel/efectos de la radiación , Dermatólogos/estadística & datos numéricos , Neoplasias Cutáneas/prevención & control , Educación del Paciente como Asunto/métodos
2.
Arch Dermatol Res ; 316(7): 399, 2024 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-38878236

RESUMEN

Vitiligo is considered an autoimmune disease, and its treatment is challenging. We assessed and compared the effect of fractional erbium:yttrium-aluminum-garnet (Er:YAG) laser-assisted delivery of platelet-rich plasma versus microneedling (Mn) with platelet-rich plasma (PRP) in enhancing skin repigmentation in localized stable vitiligo patients. In total, 40 patients with localized stable vitiligo were selected in a random manner into two similar groups (20 each). Group (A) was subjected to fractional Er:YAG laser combined with platelet-rich plasma and Group (B) was subjected to microneedling combined with platelet-rich plasma. The procedure was repeated every 2 weeks for up to 6 months. Each individual was assessed clinically utilizing Vitiligo Area Scoring Index (VASI). Fractional Er:YAG + PRP group achieved better pigmentation100% (excellent 30%, very good 15%, good 30% and satisfactory 25%) which is comparable to Mn + PRP where 80% of cases demonstrate repigmentation (20% very good, 10% good and 50% mild). When comparing the VASI scores for both groups after therapy to the baseline VASI, there was a statistically significant decrease [p = 0.001 for group(A) and 0.003 for group(B)]. Regarding the treatment side effects, there was significantly (p = 0.048) side effects among cases treated with microneedling group(B) (25%) than those fractional Er:Yag laser therapy group(A) (5%). Both forms of therapy demonstrated induction of repigmentation of vitiligo, but fractional Er:YAG laser efficacy is greater when combined with platelet-rich plasma.Clinical trials.gov identifier: NCT05511493.


Asunto(s)
Láseres de Estado Sólido , Agujas , Plasma Rico en Plaquetas , Pigmentación de la Piel , Vitíligo , Humanos , Vitíligo/terapia , Vitíligo/radioterapia , Vitíligo/diagnóstico , Láseres de Estado Sólido/uso terapéutico , Femenino , Masculino , Adulto , Resultado del Tratamiento , Pigmentación de la Piel/efectos de la radiación , Adulto Joven , Persona de Mediana Edad , Adolescente , Punción Seca/métodos , Punción Seca/instrumentación , Terapia Combinada/métodos , Inducción Percutánea del Colágeno
3.
Skin Res Technol ; 30(6): e13769, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38887837

RESUMEN

BACKGROUND: The total glucoside of paeony (TGP) is recognized for its immunomodulatory properties and anti-inflammatory effects. This study evaluates the efficacy of TGP combined with oral mini-pulse therapy (OMP) and narrow-band ultraviolet B (NB-UVB) in treating active nonsegmental vitiligo (NSV). MATERIALS AND METHODS: The combination therapy was contrasted against those from a group treated solely with OMP and NB-UVB. Data from 62 patients undergoing TGP combination treatment and 55 without were analyzed over a 3-month period. After 6 months, the differences in recurrence rate were investigated by follow-up. RESULTS: The findings indicate that integrating TGP may yield superior outcomes compared to OMP + NB-UVB alone. Moreover, the patient's oxidative stress makers were significantly reduced after the treatment. The majority of patients in the TGP cohort exhibited enhanced skin pigmentation over the duration. Notably, no increase in side effects or recurrence was observed in this group. Especially, patients with vitiligo on their head and neck experienced pronounced improvements. CONCLUSION: The efficacy of the combination treatment group was better than that of the control group at 2 and 3 months, and there was no difference in recurrence rate and side effects, suggesting that TGP may continue to show efficacy in NSV for a longer period of time by reducing the level of oxidative stress, and is especially suitable for patients with head and neck lesions.


Asunto(s)
Glucósidos , Paeonia , Terapia Ultravioleta , Vitíligo , Humanos , Vitíligo/terapia , Vitíligo/radioterapia , Vitíligo/tratamiento farmacológico , Femenino , Masculino , Adulto , Terapia Ultravioleta/métodos , Estudios Retrospectivos , Paeonia/química , Glucósidos/administración & dosificación , Glucósidos/uso terapéutico , Terapia Combinada/métodos , Persona de Mediana Edad , Adulto Joven , Corticoesteroides/administración & dosificación , Corticoesteroides/uso terapéutico , Resultado del Tratamiento , Administración Oral , Extractos Vegetales/administración & dosificación , Adolescente , Pigmentación de la Piel/efectos de los fármacos , Pigmentación de la Piel/efectos de la radiación
4.
Lasers Med Sci ; 39(1): 149, 2024 Jun 05.
Artículo en Inglés | MEDLINE | ID: mdl-38834924

RESUMEN

This article explores the intricacies of laser surgery, acknowledging inherent risks and complications. Patients with higher Fitzpatrick phototypes, characterized by unique biological traits, face heightened vulnerability during laser treatments. Limited experience with darker skin tones necessitates a higher level of laser expertise and a conservative approach. The study aims to comprehensively review laser therapy's side effects and complications, with a specific focus on Fitzpatrick phototypes IV through VI. We searched the MEDLINE database from 1972 to 2023 to consolidate knowledge. Results illuminate nuanced challenges associated with laser surgery in higher phototypes. In conclusion, this research emphasizes the need for enhanced expertise and caution in laser procedures for individuals with darker skin, offering valuable insights to optimize patient safety and outcomes.


Asunto(s)
Terapia por Láser , Pigmentación de la Piel , Humanos , Pigmentación de la Piel/efectos de la radiación , Terapia por Láser/efectos adversos , Terapia por Láser/instrumentación , Terapia por Láser/métodos , Complicaciones Posoperatorias/etiología
5.
Int J Mol Sci ; 25(11)2024 Jun 04.
Artículo en Inglés | MEDLINE | ID: mdl-38892387

RESUMEN

The skin-brain axis has been suggested to play a role in several pathophysiological conditions, including opioid addiction, Parkinson's disease and many others. Recent evidence suggests that pathways regulating skin pigmentation may directly and indirectly regulate behaviour. Conversely, CNS-driven neural and hormonal responses have been demonstrated to regulate pigmentation, e.g., under stress. Additionally, due to the shared neuroectodermal origins of the melanocytes and neurons in the CNS, certain CNS diseases may be linked to pigmentation-related changes due to common regulators, e.g., MC1R variations. Furthermore, the HPA analogue of the skin connects skin pigmentation to the endocrine system, thereby allowing the skin to index possible hormonal abnormalities visibly. In this review, insight is provided into skin pigment production and neuromelanin synthesis in the brain and recent findings are summarised on how signalling pathways in the skin, with a particular focus on pigmentation, are interconnected with the central nervous system. Thus, this review may supply a better understanding of the mechanism of several skin-brain associations in health and disease.


Asunto(s)
Encéfalo , Pigmentación de la Piel , Piel , Rayos Ultravioleta , Humanos , Pigmentación de la Piel/efectos de la radiación , Encéfalo/metabolismo , Animales , Piel/metabolismo , Piel/efectos de la radiación , Rayos Ultravioleta/efectos adversos , Melaninas/metabolismo , Melaninas/biosíntesis , Transducción de Señal , Conducta
6.
Eur J Cancer ; 204: 114074, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38691877

RESUMEN

Cancers of the skin are the most commonly occurring cancers in humans. In fair-skinned populations, up to 95% of keratinocyte skin cancers and 70-95% of cutaneous melanomas are caused by ultraviolet radiation and are thus theoretically preventable. Currently, however, there is no comprehensive global advice on practical steps to be taken to reduce the toll of skin cancer. To address this gap, an expert working group comprising clinicians and researchers from Africa, America, Asia, Australia, and Europe, together with learned societies (European Association of Dermato-Oncology, Euromelanoma, Euroskin, European Union of Medical Specialists, and the Melanoma World Society) reviewed the extant evidence and issued the following evidence-based recommendations for photoprotection as a strategy to prevent skin cancer. Fair skinned people, especially children, should minimise their exposure to ultraviolet radiation, and are advised to use protective measures when the UV index is forecast to reach 3 or higher. Protective measures include a combination of seeking shade, physical protection (e.g. clothing, hat, sunglasses), and applying broad-spectrum, SPF 30 + sunscreens to uncovered skin. Intentional exposure to solar ultraviolet radiation for the purpose of sunbathing and tanning is considered an unhealthy behaviour and should be avoided. Similarly, use of solaria and other artificial sources of ultraviolet radiation to encourage tanning should be strongly discouraged, through regulation if necessary. Primary prevention of skin cancer has a positive return on investment. We encourage policymakers to communicate these messages to the general public and promote their wider implementation.


Asunto(s)
Neoplasias Cutáneas , Rayos Ultravioleta , Humanos , Neoplasias Cutáneas/prevención & control , Neoplasias Cutáneas/etiología , Neoplasias Cutáneas/epidemiología , Rayos Ultravioleta/efectos adversos , Pigmentación de la Piel/efectos de la radiación , Protectores Solares/uso terapéutico , Melanoma/prevención & control , Melanoma/etiología , Melanoma/epidemiología , Neoplasias Inducidas por Radiación/prevención & control , Neoplasias Inducidas por Radiación/etiología , Neoplasias Inducidas por Radiación/epidemiología , Factores de Riesgo
7.
Int J Mol Sci ; 25(10)2024 May 10.
Artículo en Inglés | MEDLINE | ID: mdl-38791225

RESUMEN

Epidermal melanin synthesis determines an individual's skin color. In humans, melanin is formed by melanocytes within the epidermis. The process of melanin synthesis strongly depends on a range of cellular factors, including the fine-tuned interplay with reactive oxygen species (ROS). In this context, a role of cold atmospheric plasma (CAP) on melanin synthesis was proposed due to its tunable ROS generation. Herein, the argon-driven plasma jet kINPen® MED was employed, and its impact on melanin synthesis was evaluated by comparison with known stimulants such as the phosphodiesterase inhibitor IBMX and UV radiation. Different available model systems were employed, and the melanin content of both cultured human melanocytes (in vitro) and full-thickness human skin biopsies (in situ) were analyzed. A histochemical method detected melanin in skin tissue. Cellular melanin was measured by NIR autofluorescence using flow cytometry, and a highly sensitive HPLC-MS method was applied, which enabled the differentiation of eu- and pheomelanin by their degradation products. The melanin content in full-thickness human skin biopsies increased after repeated CAP exposure, while there were only minor effects in cultured melanocytes compared to UV radiation and IBMX treatment. Based on these findings, CAP does not appear to be a useful option for treating skin pigmentation disorders. On the other hand, the risk of hyperpigmentation as an adverse effect of CAP application for wound healing or other dermatological diseases seems to be neglectable.


Asunto(s)
Epidermis , Melaninas , Melanocitos , Gases em Plasma , Humanos , Melaninas/metabolismo , Melaninas/biosíntesis , Melanocitos/metabolismo , Melanocitos/efectos de los fármacos , Gases em Plasma/farmacología , Epidermis/metabolismo , Epidermis/efectos de los fármacos , Epidermis/efectos de la radiación , Rayos Ultravioleta , Pigmentación de la Piel/efectos de los fármacos , Pigmentación de la Piel/efectos de la radiación , Células Cultivadas , Especies Reactivas de Oxígeno/metabolismo , Biopsia , Melanogénesis
8.
Peptides ; 177: 171215, 2024 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-38608837

RESUMEN

Melasma is a common skin disease induced by an increase in the content of melanin in the skin, which also causes serious physical and mental harm to patients. In this research, a novel peptide (Nigrocin-OA27) from Odorrana andersonii is shown to exert a whitening effect on C57 mice pigmentation model. The peptide also demonstrated non-toxic and antioxidant capacity, and can significantly reduce melanin content in B16 cells. Topical application effectively delivered Nigrocin-OA27 to skin's epidermal and dermal layers and exhibited significant preventive and whitening effects on the UVB-induced ear pigmentation model in C57 mice. The whitening mechanism of Nigrocin-OA27 may be related to reduced levels of the microphthalmia-associated transcription factor and the key enzyme for melanogenesis-tyrosinase (TYR). Nigrocin-OA27 also inhibited the catalytic activity by adhering to the active core of TYR, thereby reducing melanin formation and deposition. In conclusion, Nigrocin-OA27 may be a potentially effective external agent to treat melasma by inhibiting aberrant skin melanin synthesis.


Asunto(s)
Melaninas , Factor de Transcripción Asociado a Microftalmía , Monofenol Monooxigenasa , Rayos Ultravioleta , Animales , Melaninas/metabolismo , Melaninas/biosíntesis , Factor de Transcripción Asociado a Microftalmía/metabolismo , Factor de Transcripción Asociado a Microftalmía/genética , Ratones , Monofenol Monooxigenasa/metabolismo , Rayos Ultravioleta/efectos adversos , Péptidos/farmacología , Péptidos/química , Pigmentación de la Piel/efectos de los fármacos , Pigmentación de la Piel/efectos de la radiación , Ratones Endogámicos C57BL , Piel/efectos de los fármacos , Piel/metabolismo , Piel/efectos de la radiación , Piel/patología , Transducción de Señal/efectos de los fármacos
9.
Pigment Cell Melanoma Res ; 37(3): 378-390, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38343115

RESUMEN

We have discovered that human vitiligo patients treated with narrow-band UVB (NBUVB) demonstrated localized resistance to repigmentation in skin sites characterized by distinct cellular and molecular pathways. Using immunostaining studies, discovery-stage RNA-Seq analysis, and confirmatory in situ hybridization, we analyzed paired biopsies collected from vitiligo lesions that did not repigment after 6 months of NBUVB treatment (non-responding) and compared them with repigmented (responding) lesions from the same patient. Non-responding lesions exhibited acanthotic epidermis, had low number of total, proliferative, and differentiated melanocyte (MC) populations, and increased number of senescent keratinocytes (KCs) and of cytotoxic CD8+ T cells as compared with responding lesions. The abnormal response in the non-responding lesions was driven by a dysregulated cAMP pathway and of upstream activator PDE4B, and of WNT/ß-catenin repigmentation pathway. Vitiligo-responding lesions expressed high levels of WNT10B ligand, a molecule that may prevent epidermal senescence induced by NBUVB, and that in cultured melanoblasts prevented the pro-melanogenic effect of α-MSH. Understanding the pathways that govern lack of NBUVB-induced vitiligo repigmentation has a great promise in guiding the development of new therapeutic strategies for vitiligo.


Asunto(s)
Epidermis , Melanocitos , Pigmentación de la Piel , Vitíligo , Vitíligo/patología , Vitíligo/radioterapia , Vitíligo/metabolismo , Humanos , Epidermis/patología , Epidermis/metabolismo , Epidermis/efectos de la radiación , Pigmentación de la Piel/efectos de la radiación , Melanocitos/patología , Melanocitos/metabolismo , Melanocitos/efectos de la radiación , Terapia Ultravioleta/métodos , Queratinocitos/metabolismo , Queratinocitos/patología , Queratinocitos/efectos de la radiación , Rayos Ultravioleta , Femenino , Masculino , Vía de Señalización Wnt , Fosfodiesterasas de Nucleótidos Cíclicos Tipo 4/metabolismo , Fosfodiesterasas de Nucleótidos Cíclicos Tipo 4/genética
10.
Dermatol Surg ; 50(5): 459-466, 2024 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-38335306

RESUMEN

BACKGROUND: Fractional nonablative lasers (NAFLs) have demonstrated efficacy and safety for treating dermatologic conditions in patients with darker skin phototypes. Nonablative lasers are preferred in darker skin tones due to lower risk of postinflammatory hyperpigmentation. OBJECTIVE: This review aims to identify the ideal laser options and parameters for treating common dermatologic conditions in patients with skin types IV-VI. MATERIALS AND METHODS: A comprehensive literature search was conducted on PubMed in May 2023. Of 1,065 articles were identified, and 40 articles met the inclusion criteria. The studies were classified based on design, dermatologic condition, and skin phototype of patients, and assigned levels of evidence according to the Modified Criteria of the Oxford Center of Evidence Based Medicine. RESULTS: Strong level 1 evidence supports the treatment of melasma and atrophic scars using NAFL. Moderate level 2 evidence was found for using NAFL in acne vulgaris, striae, and skin rejuvenation; 45% of the studies examined skin types III-IV, 20% III-V, 7.5% II-IV, 5% II-V, 5% IV alone, and 2.5% I-IV. CONCLUSION: Further research is needed to determine the optimal treatment modalities and parameters for skin types V and VI. Appropriate device selection and conservative treatment settings are crucial for optimizing outcomes and minimizing adverse events.


Asunto(s)
Acné Vulgar , Melanosis , Humanos , Acné Vulgar/complicaciones , Acné Vulgar/terapia , Melanosis/terapia , Pigmentación de la Piel/efectos de la radiación , Rejuvenecimiento , Enfermedades de la Piel/terapia , Terapia por Láser/instrumentación , Terapia por Láser/efectos adversos , Terapia por Láser/métodos , Cicatriz/etiología , Cicatriz/terapia , Estrías de Distensión/terapia , Envejecimiento de la Piel/efectos de la radiación
11.
Molecules ; 27(2)2022 Jan 11.
Artículo en Inglés | MEDLINE | ID: mdl-35056769

RESUMEN

Dermal macrophages containing melanin increase skin pigmentation since dermal melanin removal is slower than epidermal melanin removal. Lymphatic vessels are also involved in melanin clearance. We evaluated whether radiofrequency (RF) irradiation induced an increase in HSP90, which promotes lymphangiogenesis by activating the BRAF/MEK/ERK pathway and decreasing tyrosinase activity, in the UV-B exposed animal model. The HSP90/BRAF/MEK/ERK pathway was upregulated by RF. Tyrosinase activity and the VEGF-C/VEGFR 3/PI3K/pAKT1/2/pERK1/2 pathway, which increase lymphangiogenesis, as well as the expression of the lymphatic endothelial marker LYVE-1, were increased by RF. Additionally, the number of melanin-containing dermal macrophages, the melanin content in the lymph nodes, and melanin deposition in the skin were decreased by RF. In conclusion, RF increased HSP90/BRAF/MEK/ERK expression, which decreased tyrosinase activity and increased lymphangiogenesis to eventually promote the clearance of dermal melanin-containing macrophages, thereby decreasing skin pigmentation.


Asunto(s)
Linfangiogénesis/efectos de la radiación , Ondas de Radio , Pigmentación de la Piel/efectos de la radiación , Rayos Ultravioleta , Biomarcadores , Quinasas MAP Reguladas por Señal Extracelular/metabolismo , Proteínas HSP90 de Choque Térmico , Hiperpigmentación/etiología , Hiperpigmentación/metabolismo , Hiperpigmentación/patología , Inmunohistoquímica , Macrófagos/inmunología , Macrófagos/metabolismo , Macrófagos/efectos de la radiación , Melaninas/biosíntesis , Modelos Biológicos , Proteínas Proto-Oncogénicas B-raf/genética , Proteínas Proto-Oncogénicas B-raf/metabolismo , Transducción de Señal/efectos de la radiación , Factor C de Crecimiento Endotelial Vascular/metabolismo , Receptor 3 de Factores de Crecimiento Endotelial Vascular/metabolismo
12.
Dermatol Surg ; 48(1): 109-113, 2022 01 01.
Artículo en Inglés | MEDLINE | ID: mdl-34608097

RESUMEN

BACKGROUND AND OBJECTIVES: Picosecond (ps) fractional lasers create small wounds, presumably by laser-induced optical breakdown. We studied a ps fractional laser in the treatment of wrinkles and mottled pigment. MATERIALS AND METHODS: This was a single center, prospective, open-label clinical trial. Patients with at least 2 facial areas, with visible wrinkles and dyschromia, were enrolled in the study and received 3 treatments at monthly intervals and appeared at 3 follow-up visits at 1, 3, and 6 months after treatment. The laser is an 800 ps fractional system with nominal 10 mm macrospot diameter. Both 532 nm and 1,064 nm wavelengths were applied in each subject. Wrinkle and pigmentation clearance were assessed by 2 blinded investigators using a 5-point clearance scale. Skin improvement was assessed by investigators using the 5-point Global Aesthetic Improvement (GAI) Scale based on before/after photographs for the following categories: (1) fine lines/wrinkles and (2) pigmentation. RESULTS: A total of 18 healthy subjects at a single site were enrolled. At least moderate pigmentation and fine line/wrinkles improvement were observed in 93% and 79% of patients at 1 month after the last treatment according to GAI, respectively. Pigment clearance approached a mean of approximately 40%. CONCLUSION: A ps 1,064/532 fractional laser achieves reduction in fine lines and pigment.


Asunto(s)
Terapia por Láser/métodos , Envejecimiento de la Piel/efectos de la radiación , Pigmentación de la Piel/efectos de la radiación , Estética , Cara , Femenino , Estudios de Seguimiento , Voluntarios Sanos , Humanos , Terapia por Láser/instrumentación , Persona de Mediana Edad , Estudios Prospectivos , Rejuvenecimiento , Resultado del Tratamiento
13.
Clin Breast Cancer ; 22(2): e224-e231, 2022 02.
Artículo en Inglés | MEDLINE | ID: mdl-34400081

RESUMEN

BACKGROUND: In the current study, we sought to evaluate and compare the objective changes in biophysical parameters and patient-reported outcomes following radiation therapy (RT) in patients with breast cancer who underwent breast-conserving surgery (BCS) or modified radical mastectomy (MRM). MATERIALS AND METHODS: Patients older than 18 years, with stage I to III breast cancer, who were expected to receive RT were recruited between August 2015 and March 2019. Skin hydration, sebum content, pigmentation, and elasticity of the irradiated and unirradiated breast or chest wall were assessed using a noninvasive bioengineering device. Assessments were performed before the initiation of RT (T0); after the 5th (T1), 15th (T2), and 25th (T3) fractions; and 1 (T4) and 3 months (T5) after the completion of RT. Patient-reported outcomes were also evaluated using Radiation Dermatitis Assessment for Breast Cancer 11. RESULTS: Hydration and sebum levels on the irradiated breast decreased during RT and had not returned to baseline at T5. Erythema on the irradiated breast increased two-fold between T0 and T3, and melanin levels were significantly higher than those at baseline and those of the contralateral unirradiated breast until T5 (106.0 vs. 115.8, P = .03). More than half of the patients continued to report skin color changes, dryness, and pain after RT. The erythema in the irradiated site at T1 was significantly higher in the MRM group than in the BCS group (P for interaction = .04), while there were no significant differences in the changes of the other parameters. CONCLUSION: RT-induced changes in hydration, sebum, and melanin, and the majority of patient-reported pain, color changes, and dryness, even 3 months after the completion of treatment. There were no remarkable differences in the measurable skin parameters according to the surgery type, with the exception of erythema, which was higher in the MRM group 1 week after the start of RT.


Asunto(s)
Neoplasias de la Mama/radioterapia , Radioterapia Adyuvante/efectos adversos , Enfermedades de la Piel/inducido químicamente , Enfermedades de la Piel/diagnóstico , Adulto , Anciano , Neoplasias de la Mama/patología , Femenino , Humanos , Concentración de Iones de Hidrógeno , Persona de Mediana Edad , Estudios Prospectivos , Piel/efectos de la radiación , Pigmentación de la Piel/efectos de la radiación
14.
Int J Mol Sci ; 22(19)2021 Sep 27.
Artículo en Inglés | MEDLINE | ID: mdl-34638746

RESUMEN

A 308 nm monochromatic excimer light (MEL) is widely used to treat patients with vitiligo. However, dose optimization still needs to be clarified. This study aimed to obtain objective evidence regarding various doses of MEL irradiation, induced cell level changes in vitro, and skin level alterations in vivo. Cultured human keratinocytes were irradiated with MEL using various doses. After irradiation at low doses, stem cell factor, endothelin-1, and glycoprotein nonmetastatic melanoma protein B, factors that activate and protect melanocytes, were found to be significantly elevated in keratinocytes. After irradiation using medium and high doses, inflammatory cytokines were induced. The amount of ATP released and the level of inflammasome activation, which are known to be related to interleukin-1ß activation, were also increased. The back skin of guinea pigs and mice were irradiated with MEL at varying doses. After irradiation, an increase of epidermal melanin and epidermal melanocytes was confirmed, using the minimal erythemal dose or less. In rhododendrol-induced leukoderma guinea pigs, a much lower dose of MEL irradiation was effective, when compared with the effective dose for control guinea pigs. Our results suggest that a lower irradiation dose of MEL might be sufficient and more suitable for repigmentation in vitiligo treatment.


Asunto(s)
Queratinocitos/metabolismo , Melanocitos/metabolismo , Pigmentación de la Piel/efectos de la radiación , Terapia Ultravioleta , Vitíligo , Animales , Línea Celular , Femenino , Cobayas , Humanos , Ratones , Vitíligo/metabolismo , Vitíligo/radioterapia
15.
Int J Mol Sci ; 22(19)2021 Oct 03.
Artículo en Inglés | MEDLINE | ID: mdl-34639063

RESUMEN

Autophagy is involved in the degradation of melanosomes and the determination of skin color. TLR4 and tumor necrosis factor (TNF) signaling upregulates NF-kB expression, which is involved in the upregulation of mTOR. The activation of mTOR by UV-B exposure results in decreased autophagy, whereas radiofrequency (RF) irradiation decreases TLR4 and TNF receptor (TNFR) expression. We evaluated whether RF decreased skin pigmentation by restoring autophagy by decreasing the expression of TLR4 or TNFR/NF-κB/mTOR in the UV-B-irradiated animal model. UV-B radiation induced the expressions of TNFR, TLR, and NF-κB in the skin, which were all decreased by RF irradiation. RF irradiation also decreased phosphorylated mTOR expression and upregulated autophagy initiation factors such as FIP200, ULK1, ULK2, ATG13, and ATG101 in the UV-B-irradiated skin. Beclin 1 expression and the expression ratio of LC3-I to LC3-II were increased by UV-B/RF irradiation. Furthermore, melanin-containing autophagosomes increased with RF irradiation. Fontana-Masson staining showed that the amount of melanin deposition in the skin was decreased by RF irradiation. This study showed that RF irradiation decreased skin pigmentation by restoring melanosomal autophagy, and that the possible signal pathways which modulate autophagy could be TLR4, TNFR, NF-κB, and mTOR.


Asunto(s)
Autofagia/efectos de la radiación , Melaninas/biosíntesis , Melanosomas/metabolismo , Ondas de Radio , Pigmentación de la Piel/efectos de la radiación , Rayos Ultravioleta , Biomarcadores , Células Cultivadas , Regulación de la Expresión Génica/efectos de la radiación , Humanos , Inmunohistoquímica , FN-kappa B/metabolismo , Receptores del Factor de Necrosis Tumoral/genética , Receptores del Factor de Necrosis Tumoral/metabolismo , Pigmentación de la Piel/genética , Serina-Treonina Quinasas TOR/genética , Serina-Treonina Quinasas TOR/metabolismo , Receptor Toll-Like 4/metabolismo
16.
Photochem Photobiol Sci ; 20(10): 1299-1307, 2021 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-34559384

RESUMEN

PUVA is a treatment that combines oral methoxypsoralen (8-MOP) with ultraviolet radiation A (UVA). It is used for severe psoriasis and the early stages of T-cell lymphoma. X-rays are an effective treatment for skin cancers. Both treatments are in higher doses used to treat skin malignancies and simultaneously increase the risk of keratinocyte cancer. The main objective of this study was to test whether a few PUVA or X-ray treatments could delay the development of ultraviolet radiation (UVR)-induced skin tumors in a well-established hairless mouse model. Three groups of immunocompetent mice (total, N = 75) were included in the study. All groups were UVR-exposed during the study period. In addition, one group was treated with PUVA and another group was treated with X-rays at days 45, 52, 90 and 97. A control group was treated with UVR only. We recorded when the first, second and third skin tumors were induced in each mouse. Skin tumors developed significantly earlier in both the PUVA and X-ray groups (median, 188 days) than in the control mice (median, 215 days; p < 0.001). Therefore, a few X-ray and PUVA treatments both significantly accelerated the development of skin tumors in hairless mice, compared to UVR controls. Neither treatment showed a delay of UVR-induced skin tumors and caution should be exercised before applying these treatments to sun-damaged skin.


Asunto(s)
Metoxaleno/efectos adversos , Neoplasias Cutáneas/etiología , Rayos Ultravioleta , Animales , Huésped Inmunocomprometido , Estimación de Kaplan-Meier , Metoxaleno/química , Metoxaleno/farmacología , Ratones , Ratones Pelados , Neoplasias Inducidas por Radiación/etiología , Piel/patología , Neoplasias Cutáneas/mortalidad , Neoplasias Cutáneas/patología , Pigmentación de la Piel/efectos de los fármacos , Pigmentación de la Piel/efectos de la radiación , Rayos X
17.
Cell Rep ; 36(5): 109492, 2021 08 03.
Artículo en Inglés | MEDLINE | ID: mdl-34348144

RESUMEN

Early differential diagnosis between malignant and benign tumors and their underlying intrinsic differences are the most critical issues for life-threatening cancers. To study whether human acral melanomas, deadly cancers that occur on non-hair-bearing skin, have distinct origins that underlie their invasive capability, we develop fate-tracing technologies of melanocyte stem cells in sweat glands (glandular McSCs) and in melanoma models in mice and compare the cellular dynamics with human melanoma. Herein, we report that glandular McSCs self-renew to expand their migratory progeny in response to genotoxic stress and trauma to generate invasive melanomas in mice that mimic human acral melanomas. The analysis of melanocytic lesions in human volar skin reveals that genetically unstable McSCs expand in sweat glands and in the surrounding epidermis in melanomas but not in nevi. The detection of such cell spreading dynamics provides an innovative method for an early differential diagnosis of acral melanomas from nevi.


Asunto(s)
Movimiento Celular , Melanoma/patología , Nevo/patología , Células Madre/patología , Animales , Movimiento Celular/efectos de la radiación , Proliferación Celular/efectos de la radiación , Ciclina D1/metabolismo , Modelos Animales de Enfermedad , Epidermis/patología , Epidermis/efectos de la radiación , Amplificación de Genes , Inestabilidad Genómica/efectos de la radiación , Melanocitos/patología , Melanocitos/efectos de la radiación , Melanoma/diagnóstico , Ratones Endogámicos C57BL , Factores de Riesgo , Piel/patología , Piel/efectos de la radiación , Pigmentación de la Piel/efectos de la radiación , Glándulas Sudoríparas/efectos de la radiación , Rayos Ultravioleta
18.
Int J Med Sci ; 18(14): 3299-3308, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34400899

RESUMEN

Plant tissue culture holds immense potential for the production of secondary metabolites with various physiological functions. We recently established a plant tissue culture system capable of producing secondary metabolites from Aster yomena. This study aimed to uncover the mechanisms underlying the potential therapeutic effects of Aster yomena callus pellet extract (AYC-P-E) on photoaging-induced skin pigmentation. Excessive melanogenesis was induced in B16F10 melanoma cells using α-melanocyte stimulating hormone (α-MSH). The effects of AYC-P-E treatment on melanin biosynthesis inducers and melanin synthesis inhibition were assessed. Based on the results, a clinical study was conducted in subjects with skin pigmentation. AYC-P-E inhibited melanogenesis in α-MSH-treated B16F10 cells, accompanied by decreased mRNA and protein expression of melanin biosynthesis inducers, including cyclic AMP response element-binding protein (CREB), tyrosinase, microphthalmia-associated transcription factor (MITF), tyrosinase related protein-1 (TRP-1), and TRP-2. This anti-melanogenic effect was mediated by mitogen-activated protein kinase (MEK)/extracellular signal-regulated kinase (ERK) and protein kinase B (AKT) phosphorylation. Treatment of subjects with skin pigmentation with AYC-P-E-containing cream formulations resulted in 3.33%, 7.06%, and 8.68% improvement in the melanin levels at 2, 4, and 8 weeks, respectively. Our findings suggest that AYC-P-E inhibits excessive melanogenesis by activating MEK/ERK and AKT signaling, potentiating its cosmetic applications in hyperpigmentation treatment.


Asunto(s)
Aster/química , Dermatosis Facial/tratamiento farmacológico , Hiperpigmentación/tratamiento farmacológico , Melaninas/antagonistas & inhibidores , Extractos Vegetales/farmacología , Adulto , Animales , Línea Celular Tumoral , Femenino , Humanos , Hiperpigmentación/etiología , Hiperpigmentación/fisiopatología , Sistema de Señalización de MAP Quinasas/efectos de los fármacos , Melaninas/biosíntesis , Ratones , Persona de Mediana Edad , Extractos Vegetales/uso terapéutico , Envejecimiento de la Piel/fisiología , Crema para la Piel/farmacología , Crema para la Piel/uso terapéutico , Pigmentación de la Piel/efectos de los fármacos , Pigmentación de la Piel/efectos de la radiación , Resultado del Tratamiento
19.
Cell ; 184(16): 4268-4283.e20, 2021 08 05.
Artículo en Inglés | MEDLINE | ID: mdl-34233163

RESUMEN

Ultraviolet (UV) light and incompletely understood genetic and epigenetic variations determine skin color. Here we describe an UV- and microphthalmia-associated transcription factor (MITF)-independent mechanism of skin pigmentation. Targeting the mitochondrial redox-regulating enzyme nicotinamide nucleotide transhydrogenase (NNT) resulted in cellular redox changes that affect tyrosinase degradation. These changes regulate melanosome maturation and, consequently, eumelanin levels and pigmentation. Topical application of small-molecule inhibitors yielded skin darkening in human skin, and mice with decreased NNT function displayed increased pigmentation. Additionally, genetic modification of NNT in zebrafish alters melanocytic pigmentation. Analysis of four diverse human cohorts revealed significant associations of skin color, tanning, and sun protection use with various single-nucleotide polymorphisms within NNT. NNT levels were independent of UVB irradiation and redox modulation. Individuals with postinflammatory hyperpigmentation or lentigines displayed decreased skin NNT levels, suggesting an NNT-driven, redox-dependent pigmentation mechanism that can be targeted with NNT-modifying topical drugs for medical and cosmetic purposes.


Asunto(s)
Factor de Transcripción Asociado a Microftalmía/metabolismo , NADP Transhidrogenasas/metabolismo , Pigmentación de la Piel/efectos de la radiación , Rayos Ultravioleta , Animales , Línea Celular , Estudios de Cohortes , AMP Cíclico/metabolismo , Daño del ADN , Inhibidores Enzimáticos/química , Inhibidores Enzimáticos/farmacología , Predisposición Genética a la Enfermedad , Humanos , Melanocitos/efectos de los fármacos , Melanocitos/metabolismo , Melanosomas/efectos de los fármacos , Melanosomas/metabolismo , Melanosomas/efectos de la radiación , Ratones , Ratones Endogámicos C57BL , Mitocondrias/efectos de los fármacos , Mitocondrias/metabolismo , Monofenol Monooxigenasa/genética , Monofenol Monooxigenasa/metabolismo , NADP Transhidrogenasas/antagonistas & inhibidores , Oxidación-Reducción/efectos de los fármacos , Oxidación-Reducción/efectos de la radiación , Polimorfismo de Nucleótido Simple/genética , Complejo de la Endopetidasa Proteasomal/metabolismo , Proteolisis/efectos de los fármacos , Proteolisis/efectos de la radiación , ARN Mensajero/genética , ARN Mensajero/metabolismo , Pigmentación de la Piel/efectos de los fármacos , Pigmentación de la Piel/genética , Ubiquitina/metabolismo , Pez Cebra
20.
J Drugs Dermatol ; 20(4): 467-472, 2021 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-33852246

RESUMEN

Dermatosis papulosa nigra (DPN) is a benign skin condition that is primarily reported in skin of color patients. While prevalent, treatment options are limited and the benign course of DPNs may cause them to be overlooked by clinicians. However, large and multiple lesions in cosmetically sensitive areas may be emotionally and socially distressful to patients. There are few literature reviews examining treatment options for this condition. A literature search was performed using PubMed, Medline, Embase, and Web of Science databases. 67 articles were identified and 15 studies met the inclusion criteria. Our findings demonstrate that laser therapy is becoming increasingly utilized as a safe and efficacious treatment for DPNs in skin of color patients. J Drugs Dermatol. 20(4):467-472. doi:10.36849/JDD.2021.5555.


Asunto(s)
Legrado/métodos , Electrocirugia/métodos , Terapia por Luz de Baja Intensidad/instrumentación , Enfermedades Cutáneas Papuloescamosas/terapia , Legrado/efectos adversos , Legrado/tendencias , Fraccionamiento de la Dosis de Radiación , Electrocirugia/efectos adversos , Electrocirugia/tendencias , Humanos , Láseres de Colorantes/uso terapéutico , Láseres de Gas/uso terapéutico , Láseres de Semiconductores/uso terapéutico , Láseres de Estado Sólido/uso terapéutico , Terapia por Luz de Baja Intensidad/efectos adversos , Terapia por Luz de Baja Intensidad/tendencias , Calidad de Vida , Piel/efectos de la radiación , Enfermedades Cutáneas Papuloescamosas/psicología , Pigmentación de la Piel/efectos de la radiación , Resultado del Tratamiento
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