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Microneedling skin

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https://www.readbyqxmd.com/read/27903435/lack-of-effect-of-selected-sunscreens-applied-on-ex-vivo-human-skin-for-5-methyl-aminolevulinic-acid-penetration-and-protoporphyrin-ix-photoactivation
#1
Hanan Osman-Ponchet, Karine Sevin, Alexandre Gaborit, Magali Kouidhi, Johanna Hanaizi, Pierre Comby, Bernard Ruty, Guy Bouvier
BACKGROUND: Photodynamic therapy (PDT) is a successful treatment for non-melanoma skin cancers. Methyl-aminolevulinate (MAL) is metabolized to protoporphyrin IX (PpIX) which accumulates in the skin lesion and which generates a painful photochemical toxic reaction upon red light exposure. PDT using daylight (DL) exposure is now used to reduce pain and subjects are advised to protect the areas with sunscreen. This work investigated the effect of sunscreen on MAL penetration and PpIX photoactivation in ex vivo human skin...
November 26, 2016: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/27891724/establishing-a-canine-superficial-pyoderma-model
#2
Wolfgang Baeumer, Petra Bizikova, Megan Jacob, Keith E Linder
AIMS: Pyoderma, predominantly associated with Staphylococcus pseudintermedius, is a common skin infection of dogs that typically requires long lasting treatments, complicated by increasing antimicrobial resistance. To investigate new treatment strategies, we aimed at establishing a dog model of pyoderma that closely mimics the natural disease. METHODS AND RESULTS: We inoculated six laboratory beagles with a methicillin-susceptible strain of S. pseudintermedius. One mL of e10(7) , 10(8) , 10(9) CFU ml(-1) was topically applied onto clipped and tape stripped area of dog skin, which was then treated with a dermaroller (microneedle size: 500 μm) immediately after administration...
November 27, 2016: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/27885722/thrombin-responsive-transcutaneous-patch-for-auto-anticoagulant-regulation
#3
Yuqi Zhang, Jicheng Yu, Jinqiang Wang, Nicholas J Hanne, Zheng Cui, Chenggen Qian, Chao Wang, Hongliang Xin, Jacqueline H Cole, Caterina M Gallippi, Yong Zhu, Zhen Gu
A thrombin-responsive closed-loop patch is developed for prolonged heparin delivery in a feedback-controlled manner. This microneedle-based patch can sense activated thrombin and subsequently releases heparin to prevent coagulation in the blood flow. This "smart" heparin patch can be transcutaneously inserted into skin without drug leakage and can sustainably regulate blood coagulation in response to thrombin.
November 25, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27867727/optical-lens-microneedle-array-for-percutaneous-light-delivery
#4
Moonseok Kim, Jeesoo An, Ki Su Kim, Myunghwan Choi, Matjaž Humar, Sheldon J J Kwok, Tianhong Dai, Seok Hyun Yun
The limited penetration depth of light in skin tissues is a practical bottleneck in dermatologic applications of light-induced therapies, including anti-microbial blue light therapy and photodynamic skin cancer therapy. Here, we demonstrate a novel device, termed optical microneedle array (OMNA), for percutaneous light delivery. A prototype device with a 11 by 11 array of needles at a spacing of 1 mm and a length of 1.6 mm was fabricated by press-molding poly-(lactic acid) (PLA) polymers. The device also incorporates a matched microlens array that focuses the light through the needle tips at specific points to achieve an optimal intensity profile in the tissue...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27858218/bleomycin-coated-microneedles-for-treatment-of-warts
#5
Han Sol Lee, Ha Ryeong Ryu, Joo Young Roh, Jung-Hwan Park
PURPOSE: Bleomycin-coated microneedles were devised for delivery of bleomycin into the sub-epidermal skin layer for the treatment of warts in order to provide patient convenience and reduce patient pain and fear. METHOD: Poly-lactic-acid (L-PLA) microneedles were fabricated by a molding process and then the tips were partially coated using a dip-coating method based on a microstructure well. The mechanical strength of the pre-coated polymer microneedles was observed by inserting them in porcine foot and back skin...
November 17, 2016: Pharmaceutical Research
https://www.readbyqxmd.com/read/27854292/the-influence-of-solid-microneedles-on-the-transdermal-delivery-of-selected-antiepileptic-drugs
#6
Julia Nguyen, Kevin B Ita, Matthew J Morra, Inna E Popova
The aim of this project was to examine the effect of microneedle rollers on the percutaneous penetration of tiagabine hydrochloride and carbamazepine across porcine skin in vitro. Liquid chromatography-mass spectrometric analysis was carried out using an Agilent 1200 Series HPLC system coupled to an Agilent G1969A TOF-MS system. Transdermal flux values of the drugs were determined from the steady-state portion of the cumulative amount versus time curves. Following twelve hours of microneedle roller application, there was a 6...
November 15, 2016: Pharmaceutics
https://www.readbyqxmd.com/read/27849406/curative-effects-of-microneedle-fractional-radiofrequency-system-on-skin-laxity-in-asian-patients-a-prospective-double-blind-randomized-controlled-face-split-study
#7
Wenli Lu, Pinru Wu, Zhen Zhang, Jinan Chen, Xiangdong Chen, Biskup Ewelina
BACKGROUND: To date, no studies compared curative effects of thermal lesions in deep and superficial dermal layers in the same patient (face-split study). OBJECTIVE: To evaluate skin laxity effects of microneedle fractional radiofrequency induced thermal lesions in different dermal layers. METHODS AND MATERIALS: 13 patients underwent three sessions of a randomized face-split microneedle fractional radiofrequency system (MFRS) treatment of deep dermal and superficial dermal layer...
November 16, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/27833475/noninvasive-transdermal-vaccination-using-hyaluronan-nanocarriers-and-laser-adjuvant
#8
Ki Su Kim, Hyemin Kim, Yunji Park, Won Ho Kong, Seung Woo Lee, Sheldon J J Kwok, Sei Kwang Hahn, Seok Hyun Yun
Vaccines are commonly administered by injection using needles. Although transdermal microneedles are less-invasive promising alternatives, needle-free topical vaccination without involving physical damage to the natural skin barrier is still sought after as it can further reduce needle-induced anxiety and simply administration. However, this long-standing goal has been elusive since the intact skin is impermeable to most macromolecules. Here, we show an efficient, non-invasive transdermal vaccination in mice by employing two key innovations: first, the use of hyaluronan (HA) as vaccine carriers and, second, non-ablative laser adjuvants...
April 19, 2016: Advanced Functional Materials
https://www.readbyqxmd.com/read/27824918/skin-vaccination-against-rotavirus-using-microneedles-proof-of-concept-in-gnotobiotic-piglets
#9
Yuhuan Wang, Anastasia Vlasova, Daniel E Velasquez, Linda J Saif, Sukumar Kandasamy, Efrat Kochba, Yotam Levin, Baoming Jiang
Live-attenuated oral rotavirus (RV) vaccines have lower efficacy in low income countries, and additionally are associated with a rare but severe adverse event, intussusception. We have been pursuing the development of an inactivated rotavirus vaccine (IRV) using the human rotavirus strain CDC-9 (G1P[8]) through parenteral immunization and previously demonstrated dose sparing and enhanced immunogenicity of intradermal (ID) unadjuvanted IRV using a coated microneedle patch in comparison with intramuscular (IM) administration in mice...
2016: PloS One
https://www.readbyqxmd.com/read/27802901/percutaneous-penetration-of-anticancer-agents-past-present-and-future
#10
REVIEW
Kevin Ita
Cancer occurs as a result of alterations in oncogenes, tumor-suppressor genes, and microRNA genes. Over the past few decades, efforts have been made to understand the dominant oncogenes and tumor suppressor genes whose respective activation/upregulation or loss of function serve to impart aberrant properties on normal cells. Cancer continues to be a source of public health concern due to widespread prevalence, morbidity and mortality. The most common types include but are not limited to lung, prostate, colorectal, breast, ovarian and skin cancers...
October 29, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27793685/transcutaneous-immunization-via-rapidly-dissolvable-microneedles-protects-against-hand-foot-and-mouth-disease-caused-by-enterovirus-71
#11
Zhuangzhi Zhu, Xiaohua Ye, Zhiqiang Ku, Qingwei Liu, Chaoyun Shen, Huafei Luo, Hansen Luan, Chenghao Zhang, Shaoqiong Tian, CheeYen Lim, Zhong Huang, Hao Wang
Recent large outbreaks of hand-foot-and-mouth disease (HFMD) have seriously affected the health of young children. Enterovirus 71 (EV71) is the main causative agent of HFMD. Herein, for the first time, rapidly dissolvable microneedles (MNs) loaded with EV71 virus-like particles (VLPs) were evaluated whether they could induce robust immune responses that confer protection against EV71 infection. The characteristics of prepared MNs including hygroscopy, mechanical strength, insertion capacity, dissolution profile, skin irritation and storage stability were comprehensively assessed...
October 25, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/27755171/microneedling-a-comprehensive-review
#12
Angela Hou, Brandon Cohen, Adele Haimovic, Nada Elbuluk
BACKGROUND: Microneedling is a minimally invasive procedure that uses fine needles to puncture the epidermis. The microwounds created stimulate the release of growth factors and induce collagen production. The epidermis remains relatively intact, therefore helping to limit adverse events. The indications for microneedling therapy have grown significantly, and it is becoming a more widely used treatment in dermatology. OBJECTIVE: A comprehensive review of microneedling in human subjects and its applications in dermatology...
October 13, 2016: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/27746638/repeated-microneedle-stimulation-induces-enhanced-hair-growth-in-a-murine-model
#13
Yoon Seob Kim, Kwan Ho Jeong, Jung Eun Kim, Young Jun Woo, Beom Joon Kim, Hoon Kang
BACKGROUND: Microneedle is a method that creates transdermal microchannels across the stratum corneum barrier layer of skin. No previous study showed a therapeutic effect of microneedle itself on hair growth by wounding. OBJECTIVE: The aim of this study is to investigate the effect of repeated microwound formed by microneedle on hair growth and hair growth-related genes in a murine model. METHODS: A disk microneedle roller was applied to each group of mice five times a week for three weeks...
October 2016: Annals of Dermatology
https://www.readbyqxmd.com/read/27711262/toward-self-powered-wearable-adhesive-skin-patch-with-bendable-microneedle-array-for-transdermal-drug-delivery
#14
Hao Wang, Giorgia Pastorin, Chengkuo Lee
A wearable adhesive skin patch for transdermal drug delivery is developed with bendable microneedles, dry adhesive and triboelectric energy harvester (TEH). The bendable microneedle array can overcome the needle breakage issue. The dry adhesive can realize a conformal attachment. The TEH can generate power when attached on flat skin or joint to power active components to be integrated in the future.
September 2016: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/27633885/the-use-of-a-pressure-indicating-sensor-film-to-provide-feedback-upon-hydrogel-forming-microneedle-array-self-application-in-vivo
#15
Eva M Vicente-Pérez, Helen L Quinn, Emma McAlister, Shannon O'Neill, Lezley-Anne Hanna, Johanne G Barry, Ryan F Donnelly
PURPOSE: To evaluate the combination of a pressure-indicating sensor film with hydrogel-forming microneedle arrays, as a method of feedback to confirm MN insertion in vivo. METHODS: Pilot in vitro insertion studies were conducted using a Texture Analyser to insert MN arrays, coupled with a pressure-indicating sensor film, at varying forces into excised neonatal porcine skin. In vivo studies involved twenty human volunteers, who self-applied two hydrogel-forming MN arrays, one with a pressure-indicating sensor film incorporated and one without...
December 2016: Pharmaceutical Research
https://www.readbyqxmd.com/read/27626885/challenges-and-recent-advances-in-the-subcutaneous-delivery-of-insulin
#16
Xiaohui Guo, Wei Wang
INTRODUCTION: The morbidity of diabetes mellitus is increasing, and subcutaneous injection of exogenous insulin is well established as an effective therapeutic strategy for reducing complications associated with the disease. However, the pain that accompanies repeated injections is an important drawback, and can detrimentally affect the adherence to therapy. Recently, there have been great improvements in injection devices and techniques, including the development of microneedle systems and quantitative injection technologies, which have increased the accuracy of injection, decreased leakage of insulin to the skin surface, and reduced pain...
September 14, 2016: Expert Opinion on Drug Delivery
https://www.readbyqxmd.com/read/27608206/clinical-and-histologic-effects-of-fractional-microneedling-radiofrequency-treatment-on-rosacea
#17
Seon Yong Park, Hyuck Hoon Kwon, Ji Young Yoon, Seonguk Min, Dae Hun Suh
BACKGROUND: Fractional microneedling radiofrequency (FMR) is an emerging treatment modality, but its effect on rosacea has not been studied yet. OBJECTIVE: To investigate the potential impact of FMR treatment on clinical improvement and histologic changes in rosacea patients. MATERIALS AND METHODS: A 12-week, prospective, randomized, split-face clinical trial was conducted. Two sessions of FMR were performed on one side of the cheeks with 4-week interval and the other side remained untreated...
September 7, 2016: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/27607247/single-step-fabrication-of-computationally-designed-microneedles-by-continuous-liquid-interface-production
#18
Ashley R Johnson, Cassie L Caudill, John R Tumbleston, Cameron J Bloomquist, Katherine A Moga, Alexander Ermoshkin, David Shirvanyants, Sue J Mecham, J Christopher Luft, Joseph M DeSimone
Microneedles, arrays of micron-sized needles that painlessly puncture the skin, enable transdermal delivery of medications that are difficult to deliver using more traditional routes. Many important design parameters, such as microneedle size, shape, spacing, and composition, are known to influence efficacy, but are notoriously difficult to alter due to the complex nature of microfabrication techniques. Herein, we utilize a novel additive manufacturing ("3D printing") technique called Continuous Liquid Interface Production (CLIP) to rapidly prototype sharp microneedles with tuneable geometries (size, shape, aspect ratio, spacing)...
2016: PloS One
https://www.readbyqxmd.com/read/27602968/microneedling-prior-to-levulan-pdt-for-the-treatment-of-actinic-keratoses-a-split-face-blinded-trial
#19
James M Spencer, Scott A Freeman
INTRODUCTION: Photodynamic Therapy (PDT) with topical Levulan is an approved and efficacious method for treating actinic keratoses. This therapy depends on the ability of the Levulan (delta amino levulinic acid) to penetrate the stratum corneum and enter the cells of the epidermis. Microneedling is an increasing popular cosmetic therapy in which an array of tiny needles is used to make holes in the epidermis and presumably induce a wound healing cascade that leads to cosmetic improvement of the skin...
September 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/27600045/transport-of-azithromycin-into-extravascular-space-in-rats
#20
Shinji Kobuchi, Miki Aoki, Chiaki Inoue, Hiroyuki Murakami, Akiko Kuwahara, Tsutomu Nakamura, Hiroyuki Yasui, Yukako Ito, Kanji Takada, Toshiyuki Sakaeda
Recent clinical trials showed prolonged retention of subinhibitory unbound azithromycin concentrations in the interstitial fluid of soft tissues, despite the fact that azithromycin is extensively distributed in tissues. In these clinical trials, interstitial fluid samples were obtained using the microdialysis method, and it was established that drug concentrations represent protein-unbound drug concentrations. The present study was designed to measure total azithromycin concentrations in the interstitial fluid of the skin of rats by directly collecting interstitial fluid samples from a pore formed on the skin by a dissolving microneedle array...
September 6, 2016: Antimicrobial Agents and Chemotherapy
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