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https://www.readbyqxmd.com/read/27918217/dissolving-microneedles-for-enhanced-local-delivery-of-capsaicin-to-rat-skin-tissue
#1
Yukako Ito, Shinji Kobuchi, Genta Inoue, Eisaku Kakumu, Miki Aoki, Toshiyuki Sakaeda, Kanji Takada
Capsaicin-loaded dissolving microneedles (DMNs) were prepared to investigate the analgesic effect of capsaicin on the skin. The dimensions of each microneedle were as follows: diameter of the basement, 17 mm; length, 500 μm; and width, 300 μm. The average capsaicin content in the DMNs loaded with a low and high dose of capsaicin was 8.8 ± 0.5 mg and 12.5 ± 0.4 mg. Almost all of the capsaicin, 99.3 ± 4.1% and 99.7 ± 2.2% for low-dose and high-dose DMNs were released within 20 min. High amounts of capsaicin were recovered with 102...
December 5, 2016: Journal of Drug Targeting
https://www.readbyqxmd.com/read/27917703/principles-of-the-kenzan-method-for-robotic-cell-spheroid-based-3d-bioprinting
#2
Nicanor I Moldovan, Narutoshi Hibino, Koichi Nakayama
Bioprinting is a technology with the prospect to change the way many diseases are treated, by replacing the damaged tissues with live, de novo created bio-similar constructs. However, after more than a decade of incubation and many proofs-of-concept, the field is still in its infancy. The current stagnation is the consequence of its early success: the first bioprinters, and most of those which followed, were modified versions of the 3D printers used in additive manufacturing, redesigned for layer-by-layer dispersion of biomaterials...
December 4, 2016: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/27913138/compared-in-vivo-efficiency-of-nanoemulsions-unloaded-and-loaded-with-calixarene-and-soapy-water-in-the-treatment-of-superficial-wounds-contaminated-by-uranium
#3
Sophie Grivès, Guillaume Phan, Céline Bouvier-Capely, David Suhard, François Rebière, Michelle Agarande, Elias Fattal
No emergency decontamination treatment is currently available in the case of radiological skin contamination by uranium compounds. First responders in the workplace or during an industrial nuclear accident must be able to treat internal contamination through skin. For this purpose, a calixarene nanoemulsion was developed for the treatment of intact skin or superficial wounds contaminated by uranium, and the decontamination efficiency of this nanoemulsion was investigated in vitro and ex vivo. The present work addresses the in vivo decontamination efficiency of this nanoemulsion, using a rat model...
November 29, 2016: Chemico-biological Interactions
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
#4
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
#5
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
#6
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/27875227/a-stretchable-microneedle-electrode-array-for-stimulating-and-measuring-intramuscular-electromyographic-activity
#7
Gareth S Guvanasen, Liang Guo, Ricardo J Aguilar, Ashton L Cheek, Chancellor S Shafor, Swaminathan Rajaraman, T Richard Nichols, Stephen P DeWeerth
We have developed a stretchable microneedle electrode array (sMEA) to stimulate and measure the electrical activity of muscle across multiple sites. The technology provides the signal fidelity and spatial resolution of intramuscular electrodes across a large area of tissue. Our sMEA is composed of a polydimethylsiloxane (PDMS) substrate, conductive-PDMS traces, and stainless-steel penetrating electrodes. The traces and microneedles maintain a resistance of less than 10 kΩ when stretched up to a ~63% tensile strain, which allows for the full range of physiological motion of feline muscle...
November 16, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/27867727/optical-lens-microneedle-array-for-percutaneous-light-delivery
#8
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
#9
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
#10
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
#11
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/27846370/dissolving-microneedles-for-dna-vaccination-improving-functionality-via-polymer-characterisation-and-rala-complexation
#12
Grace Cole, Joanne McCaffrey, Ahlam A Ali, John W McBride, Cian M McCrudden, Eva M Vincente-Perez, Ryan F Donnelly, Helen O McCarthy
DNA vaccination holds the potential to treat or prevent nearly any immunogenic disease, including cancer. To date, these vaccines have demonstrated limited immunogenicity in vivo due to the absence of a suitable delivery system which can protect DNA from degradation and improve transfection efficiencies in vivo. Recently, microneedles have been described as a novel physical delivery technology to enhance DNA vaccine immunogenicity. Of these devices, dissolvable microneedles promise a safe, pain-free delivery system which may simultaneously improve DNA stability within a solid matrix and increase DNA delivery compared to solid arrays...
November 15, 2016: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/27833475/noninvasive-transdermal-vaccination-using-hyaluronan-nanocarriers-and-laser-adjuvant
#13
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
#14
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
#15
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
#16
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/27793202/enhanced-cellular-infiltration-of-human-adipose-derived-stem-cells-in-allograft-menisci-using-a-needle-punch-method
#17
Rachel C Nordberg, Adisri Charoenpanich, Christopher E Vaughn, Emily H Griffith, Matthew B Fisher, Jacqueline H Cole, Jeffrey T Spang, Elizabeth G Loboa
BACKGROUND: The meniscus plays a crucial role in knee joint stability, load transmission, and stress distribution. Meniscal tears are the most common reported knee injuries, and the current standard treatment for meniscal deficiency is meniscal allograft transplantation. A major limitation of this approach is that meniscal allografts do not have the capacity to remodel and maintain tissue homeostasis due to a lack of cellular infiltration. The purpose of this study was to provide a new method for enhanced cellular infiltration in meniscal allografts...
October 28, 2016: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/27755172/commentary-on-microneedling
#18
M Laurin Council
No abstract text is available yet for this article.
October 13, 2016: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/27755171/microneedling-a-comprehensive-review
#19
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
#20
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
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