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https://www.readbyqxmd.com/read/28738520/dissolving-microneedles-for-transdermal-drug-delivery-advances-and-challenges
#1
REVIEW
Kevin Ita
Over the last number of years, a significant body of evidence has shown the benefit of using dissolving microneedles (DMNs) for transdermal drug delivery. These devices are prepared from a wide range of materials such as sugars and polymers. DMNs are mainly fabricated by micromolding, photopolymerization, drawing lithography and droplet-airborne blowing. In this review, we have focused on the advances made in the field in recent years using a representative set of studies. Although the list of studies is not exhaustive, they highlight the challenges encountered such as the need to increase mechanical strength as well as medication dose while ensuring fast release of the active ingredient...
July 19, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28738417/a-pharmacodynamic-analysis-of-choroidal-neovascularization-in-a-porcine-model-using-three-targeted-drugs
#2
Jeffrey Tran, Caroline Craven, Kathy Wabner, Jenn Schmit, Brock Matter, Uday Kompella, Hans E Grossniklaus, Timothy W Olsen
Purpose: To compare the efficacy of microneedle-delivered suprachoroidal (SC) pazopanib to intravitreal (Ivit) delivery of pazopanib, bevacizumab, or a fusion protein hI-con1 versus vehicle controls on choroidal neovascularization (CNV) growth in a pig model. Methods: Forty-one pigs were injected on the day of CNV induction (hI-con1 on postinduction day 14) with either 2.5 mg Ivit bevacizumab (n = 9), 1 mg Ivit pazopanib (n = 9), 300 Ivit μg hI-con1 (n = 4), or 1 mg SC pazopanib (n = 9), vs...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28726212/melasma-an-up-to-date-comprehensive-review
#3
REVIEW
Oluwatobi A Ogbechie-Godec, Nada Elbuluk
Melasma is a common acquired condition of symmetric hyperpigmentation, typically occurring on the face, with higher prevalence in females and darker skin types. Multiple etiologies, including light exposure, hormonal influences, and family history, have been implicated in the pathogenesis of this disorder. Overall prevalence ranges widely at 1-50%, since values are typically calculated within a specific ethnic population within a geographic region. Histologically, melasma can display increased epidermal and/or dermal pigmentation, enlarged melanocytes, increased melanosomes, solar elastosis, dermal blood vessels, and, occasionally, perivascular lymphohistiocytic infiltrates...
July 19, 2017: Dermatology and Therapy
https://www.readbyqxmd.com/read/28720851/microneedle-patch-delivery-of-influenza-vaccine-during-pregnancy-enhances-maternal-immune-responses-promoting-survival-and-long-lasting-passive-immunity-to-offspring
#4
E Stein Esser, Joanna A Pulit-Penaloza, Haripriya Kalluri, Devin McAllister, Elena V Vassilieva, Elizabeth Q Littauer, Nadia Lelutiu, Mark R Prausnitz, Richard W Compans, Ioanna Skountzou
Influenza virus causes life-threatening infections in pregnant women and their newborns. Immunization during pregnancy is the most effective means of preventing maternal and infant mortality/morbidity; however, influenza vaccination rates of pregnant women remain under 50%. Furthermore, the availability of vaccines in low-resource populations is limited. Skin immunization with microneedle patches (MN) is a novel and safe vaccination platform featuring thermostable vaccine formulations. Cold-chain independence and the potential for self-administration can expand influenza vaccination coverage in developing countries...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28718050/dissolving-microneedle-patches-for-dermal-vaccination
#5
REVIEW
M Leone, J Mönkäre, J A Bouwstra, G Kersten
The dermal route is an attractive route for vaccine delivery due to the easy skin accessibility and a dense network of immune cells in the skin. The development of microneedles is crucial to take advantage of the skin immunization and simultaneously to overcome problems related to vaccination by conventional needles (e.g. pain, needle-stick injuries or needle re-use). This review focuses on dissolving microneedles that after penetration into the skin dissolve releasing the encapsulated antigen. The microneedle patch fabrication techniques and their challenges are discussed as well as the microneedle characterization methods and antigen stability aspects...
July 17, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28714117/a-swellable-microneedle-patch-to-rapidly-extract-skin-interstitial-fluid-for-timely-metabolic-analysis
#6
Hao Chang, Mengjia Zheng, Xiaojun Yu, Aung Than, Razina Z Seeni, Rongjie Kang, Jingqi Tian, Duong Phan Khanh, Linbo Liu, Peng Chen, Chenjie Xu
Skin interstitial fluid (ISF) is an emerging source of biomarkers for disease diagnosis and prognosis. Microneedle (MN) patch has been identified as an ideal platform to extract ISF from the skin due to its pain-free and easy-to-administrated properties. However, long sampling time is still a serious problem which impedes timely metabolic analysis. In this study, a swellable MN patch that can rapidly extract ISF is developed. The MN patch is made of methacrylated hyaluronic acid (MeHA) and further crosslinked through UV irradiation...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28710002/diphtheria-toxoid-and-n-trimethyl-chitosan-layer-by-layer-coated-ph-sensitive-microneedles-induce-potent-immune-responses-upon-dermal-vaccination-in-mice
#7
Pim Schipper, Koen van der Maaden, Vincent Groeneveld, Mitchel Ruigrok, Stefan Romeijn, Sven Uleman, Cees Oomens, Gideon Kersten, Wim Jiskoot, Joke Bouwstra
Dermal immunization using antigen-coated microneedle arrays is a promising vaccination strategy. However, reduction of microneedle sharpness and the available surface area for antigen coating is a limiting factor. To overcome these obstacles, a layer-by-layer coating approach can be applied onto pH-sensitive microneedles. Following this approach, pH-sensitive microneedle arrays (positively charged at coating pH5.8 and nearly uncharged at pH7.4) were alternatingly coated with negatively charged diphtheria toxoid (DT) and N-trimethyl chitosan (TMC), a cationic adjuvant...
July 11, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28703882/centrifugal-lithography-self-shaping-of-polymer-microstructures-encapsulating-biopharmaceutics-by-centrifuging-polymer-drops
#8
Huisuk Yang, Suyong Kim, Geonwoo Kang, Shayan F Lahiji, Mingyu Jang, Young Mi Kim, Jae-Myung Kim, Sang-Nae Cho, Hyungil Jung
Polymeric microstructures encapsulating biopharmaceutics must be fabricated in a controlled environment to preserve the biological activity. There is increasing demand for simple methods designed to preserve the biological activity by utilizing the natural properties of polymers. Here, the paper shows that centrifugal lithography (CL) can be used for the fabrication of such microstructures in a single centrifugation, by engineering the self-shaping properties of hyaluronic acid (HA). In this method, HA drops are self-shaped into hourglass-microstructures to produce two dissolving microneedles (DMN), which facilitate transdermal delivery via implantation on the skin...
July 13, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28690124/microneedling-where-do-we-stand-now-a-systematic-review-of-the-literature
#9
REVIEW
Ramaut Lisa, Hoeksema Henk, Pirayesh Ali, Stillaert Filip, Monstrey Stan
BACKGROUND: Patients who suffer from scars or wrinkles have several therapeutic options to improve the appearance of their skin. The available treatment modalities that provide desirable results are often overtly invasive and entail a risk of undesirable adverse effects. Microneedling has recently emerged as a non-ablative alternative for treating patients who are concerned with the aesthetic changes that result from injury, disease or ageing. OBJECTIVE: This review aims to evaluate the current evidence in the literature on microneedling...
June 17, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28673836/microneedles-enhance-topical-delivery-of-15-deoxy-%C3%AE-12-14-prostaglandin-j2-and-reduce-nociception-in-temporomandibular-joint-of-rats
#10
Cristina G Macedo, Amit K Jain, Michelle FranzMontan, Marcelo H Napimoga, Juliana T Clemente-Napimoga, Harvinder Singh Gill
The pain arising from temporomandibular disorders is often treated with opioids and agents that inhibit the immune response and are associated with substantial adverse effects and long-term risks. Thus, the development of new therapies that are safer and more effective is of great interest to patients and clinicians. 15-deoxy-Δ(12,14)-prostaglandin J2 (15d-PGJ2) is naturally produced in the human body and has anti-inflammatory properties. We have previously shown in a rat temporomandibular joint (TMJ) model that injection of 15d-PGJ2 into the rat TMJ can provide antinociceptive relief against a subsequent noxious challenge from formalin injection into the same TMJ...
June 30, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28673424/measles
#11
REVIEW
William J Moss
Measles is a highly contagious disease that results from infection with measles virus and is still responsible for more than 100 000 deaths every year, down from more than 2 million deaths annually before the introduction and widespread use of measles vaccine. Measles virus is transmitted by the respiratory route and illness begins with fever, cough, coryza, and conjunctivitis followed by a characteristic rash. Complications of measles affect most organ systems, with pneumonia accounting for most measles-associated morbidity and mortality...
June 30, 2017: Lancet
https://www.readbyqxmd.com/read/28666680/the-safety-immunogenicity-and-acceptability-of-inactivated-influenza-vaccine-delivered-by-microneedle-patch-tiv-mnp-2015-a-randomised-partly-blinded-placebo-controlled-phase-1-trial
#12
Nadine G Rouphael, Michele Paine, Regina Mosley, Sebastien Henry, Devin V McAllister, Haripriya Kalluri, Winston Pewin, Paula M Frew, Tianwei Yu, Natalie J Thornburg, Sarah Kabbani, Lilin Lai, Elena V Vassilieva, Ioanna Skountzou, Richard W Compans, Mark J Mulligan, Mark R Prausnitz
BACKGROUND: Microneedle patches provide an alternative to conventional needle-and-syringe immunisation, and potentially offer improved immunogenicity, simplicity, cost-effectiveness, acceptability, and safety. We describe safety, immunogenicity, and acceptability of the first-in-man study on single, dissolvable microneedle patch vaccination against influenza. METHODS: The TIV-MNP 2015 study was a randomised, partly blinded, placebo-controlled, phase 1, clinical trial at Emory University that enrolled non-pregnant, immunocompetent adults from Atlanta, GA, USA, who were aged 18-49 years, naive to the 2014-15 influenza vaccine, and did not have any significant dermatological disorders...
June 27, 2017: Lancet
https://www.readbyqxmd.com/read/28659279/microneedle-patch-for-flu-vaccination-proves-successful-in-human-clinical-trial
#13
Jacqui Wise
No abstract text is available yet for this article.
June 27, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28657378/a-split-face-investigator-blinded-comparative-study-on-the-efficacy-and-safety-of-q-switched-nd-yag-laser-plus-microneedling-with-vitamin-c-versus-q-switched-nd-yag-laser-for-the-treatment-of-recalcitrant-melasma
#14
Pelin Ustuner, Ali Balevi, Mustafa Ozdemir
BACKGROUND: High recurrence has previously been reported in the treatment of melasma with low-fluence 1,064-nm QS-Nd:YAG laser. However, the efficacy and safety of QS-Nd:YAG laser plus microneedling with vitamin C has not been evaluated in patients with mixed-type melasma. MATERIAL AND METHODS: Sixteen patients with recalcitrant dermal- or mixed-type melasma were included in the study. One side of patients' face was treated with QS-Nd:YAG plus microneedling with vitamin C (Group A) and the other side with QS-Nd:YAG alone (Group B) for four sessions at four-week intervals...
June 28, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28657367/the-self-recovery-of-facial-skin-barrier-and-erythema-after-nanochip-treatment
#15
Yan Ling Tao, Afzaal Ahmed Bin Jameel, Ying Ying Miao, Bai Xu, Yan Ting Wu, Juan Liu, Bing Rong Zhou, Dan Luo
OBJECTIVE: To determine the degree of acute skin damage and the time required for the recovery of facial skin barrier function after the skin was treated with microneedles and nanochips of various tip lengths. METHODS: For this split face comparative study, a total of 16 subjects were enrolled and radomly divided into 2 groups. In the first group, one of the facial side of each subject was treated with 0.25 mm long nanotips for a total of 6 times while the other facial side was treated with 0...
June 28, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28649780/therapeutic-efficacy-and-safety-of-oral-tranexamic-acid-and-that-of-tranexamic-acid-local-infiltration-with-microinjections-in-patients-with-melasma-a-comparative-study
#16
R Sharma, V K Mahajan, K S Mehta, P S Chauhan, R Rawat, T N Shiny
BACKGROUND: Tranexamic acid (TXA) has been used orally, intravenously, topically and intradermally (microinjection, microneedling) for treating melasma. However, the comparative efficacy of these different routes of administration remains underevaluated. AIM: To ascertain the comparative efficacy of different routes of administration of TXA. METHODS: In total, 100 consecutive patients with melasma (8 men, 92 women, age range 18-55 years) were randomly assigned to one of two groups comprising 50 patients each...
June 25, 2017: Clinical and Experimental Dermatology
https://www.readbyqxmd.com/read/28647443/dermal-and-transdermal-delivery-of-pharmaceutically-relevant-macromolecules
#17
REVIEW
S Münch, J Wohlrab, R H H Neubert
The skin offers an attractive way for dermal and transdermal drug delivery that is why the drug still needs certain qualities to transcend the outermost layer of the skin, the stratum corneum. The requirements are: drugs with a maximum molecular weight of 1kDa, high lipophilicity and a certain polarity. This would restrict the use of a transdermal delivery of macromolecules, which would make the drug more effective in therapeutic administration. Various studies have shown that macromolecules without support do not penetrate the human skin...
June 21, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28645793/biocompatible-polymer-microneedle-for-topical-dermal-delivery-of-tranexamic-acid
#18
S A Machekposhti, M Soltani, P Najafizadeh, S A Ebrahimi, P Chen
Recently-introduced biocompatible polymeric microneedles offer an efficient method for drug delivery. Tranexamic acid is a novel drug for treating melasma that is administered both locally and orally and inhibits excessive melanin via melanocyte. The tranexamic acid biocompatible polymer microneedle used in this study was fabricated from PVP and methacrylic acid, using the lithography method. The required mechanical strength to pierce skin was attained by optimizing the ratio of PVP to methacrylic acid. Acute dermal toxicity was done, and drug diffusion in skin layers was simulated by calculating the diffusion coefficient of tranexamic acid in interstitial fluid (plasma)...
June 20, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28642154/a-boosting-skin-vaccination-with-dissolving-microneedle-patch-encapsulating-m2e-vaccine-broadens-the-protective-efficacy-of-conventional-influenza-vaccines
#19
Wandi Zhu, Winston Pewin, Chao Wang, Yuan Luo, Gilbert X Gonzalez, Teena Mohan, Mark R Prausnitz, Bao-Zhong Wang
The biodegradable microneedle patch (MNP) is a novel technology for vaccine delivery that could improve the immunogenicity of vaccines. To broaden the protective efficiency of conventional influenza vaccines, a new 4M2e-tFliC fusion protein construct containing M2e sequences from different subtypes was generated. Purified fusion protein was encapsulate into MNPs with a biocompatible polymer for use as a boosting vaccine. The results demonstrated that mice receiving a conventional inactivated vaccine followed by a skin-applied dissolving 4M2e-tFliC MNP boost could better maintain the humoral antibody response than that by the conventional vaccine-prime alone...
June 19, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28634948/3d-cell-culture-in-micropatterned-hydrogels-prepared-by-photomask-microneedle-or-soft-lithography-techniques
#20
Seyedsina Moeinzadeh, Esmaiel Jabbari
Despite the advantages of three-dimensional (3D) hydrogels for cell culture over traditional 2D plates, their clinical application is limited by inability to recapitulate the micro-architecture of complex tissues. Micropatterning can be employed to modify the homogenous micro-architecture of hydrogels. Three techniques for cell encapsulation in 3D micropatterned gels are described. The photomask and micromold techniques are used for cell encapsulation in relatively shallow patterns like disks or short rectangles but due to the presence of PDMS mold, the resolution of micromold technique is potentially higher than the photomask...
2017: Methods in Molecular Biology
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