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Limcharoen B, Wanichweacharungruang S, Kröger M, Sansureerungsikul T, Schleusener J, Lena Klein A, Banlunara W, Meinke MC, Darvin ME. Dissolvable microneedles in the skin: Determination the impact of barrier disruption and dry skin on dissolution. Eur J Pharm Biopharm 2024:114303. [PMID: 38657740 DOI: 10.1016/j.ejpb.2024.114303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 04/02/2024] [Accepted: 04/22/2024] [Indexed: 04/26/2024]
Abstract
Dissolvable microneedles (DMNs), fabricated from biocompatible materials that dissolve in both water and skin have gained popularity in dermatology. However, limited research exists on their application in compromised skin conditions. This study compares the hyaluronic acid-based DMNs penetration, formation of microchannels, dissolution, and diffusion kinetics in intact, barrier-disrupted (tape stripped), and dry (acetone-treated) porcine ear skin ex vivo. After DMNs application, comprehensive investigations including dermoscopy, stereomicroscope, skin hydration, transepidermal water loss (TEWL), optical coherence tomography (OCT), reflectance confocal laser scanning microscopy (RCLSM), confocal Raman micro-spectroscopy (CRM), two-photon tomography combined with fluorescence lifetime imaging (TPT-FLIM), histology, and scanning electron microscopy (SEM) were conducted. The 400 µm long DMNs successfully penetrated the skin to depths of ≈200 µm for dry skin and ≈200-290 µm for barrier-disrupted skin. Although DMNs fully inserted into all skin conditions, their dissolution rates were high in barrier-disrupted and low in dry skin, as observed through stereomicroscopy and TPT-FLIM. The dissolved polymer exhibited a more significant expansion in barrier-disrupted skin compared to intact skin, with the smallest increase observed in dry skin. Elevated TEWL and reduced skin hydration levels were evident in barrier-disrupted and dry skins compared to intact skin. OCT and RCLSM revealed noticeable skin indentation and pronounced microchannel areas, particularly in barrier-disrupted and dry skin. Additional confirmation of DMN effects on the skin and substance dissolution was obtained through histology, SEM, and CRM techniques. This study highlights the impact of skin condition on DMN effectiveness, emphasizing the importance of considering dissolvability and dissolution rates of needle materials, primarily composed of hyaluronic acid, for optimizing DMN-based drug delivery.
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Affiliation(s)
- Benchaphorn Limcharoen
- Department of Anatomy, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand; Center of Excellence in Advanced Materials and Biointerfaces, Chulalongkorn University, 10330, Thailand
| | - Supason Wanichweacharungruang
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand; Center of Excellence in Advanced Materials and Biointerfaces, Chulalongkorn University, 10330, Thailand
| | - Marius Kröger
- Department of Dermatology, Venereology and Allergology, Center of Experimental and Applied Cutaneous Physiology (CCP), Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117, Germany
| | - Titiporn Sansureerungsikul
- Mineed Technology, 928 Block 28, Building D, Chulalongkorn 7 Alley, Wangmai, Pathumwan, Bangkok 10330, Thailand
| | - Johannes Schleusener
- Department of Dermatology, Venereology and Allergology, Center of Experimental and Applied Cutaneous Physiology (CCP), Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117, Germany
| | - Anna Lena Klein
- Department of Dermatology, Venereology and Allergology, Center of Experimental and Applied Cutaneous Physiology (CCP), Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117, Germany
| | - Wijit Banlunara
- Department of Pathology, Faculty of Veterinary Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand; Center of Excellence in Advanced Materials and Biointerfaces, Chulalongkorn University, 10330, Thailand
| | - Martina C Meinke
- Department of Dermatology, Venereology and Allergology, Center of Experimental and Applied Cutaneous Physiology (CCP), Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117, Germany.
| | - Maxim E Darvin
- Department of Dermatology, Venereology and Allergology, Center of Experimental and Applied Cutaneous Physiology (CCP), Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117, Germany.
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Su Y, Shahriar SSM, Andrabi SM, Wang C, Sharma NS, Xiao Y, Wong SL, Wang G, Xie J. It Takes Two to Tangle: Microneedle Patches Co-delivering Monoclonal Antibodies and Engineered Antimicrobial Peptides Effectively Eradicate Wound Biofilms. Macromol Biosci 2024:e2300519. [PMID: 38217528 DOI: 10.1002/mabi.202300519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 12/20/2023] [Indexed: 01/15/2024]
Abstract
Wound biofilms pose a great clinical challenge. Herein, this work reports a dissolvable microneedle patch for dual delivery of monoclonal antibodies anti-PBP2a and engineers antimicrobial peptides W379. In vitro antibacterial efficacy testing with microneedle patches containing a combination of 250 ng mL-1 W379 and 250 ng mL-1 anti-BPB2a decreases the bacterial count from ≈3.31 × 107 CFU mL-1 to 1.28 × 102 CFU mL-1 within 2 h without eliciting evident cytotoxicity. Ex vivo testing indicates W379 and anti-PBP2a co-loaded microneedle patch displayed a remarkable reduction of bacterial load by ≈7.18 log CFU after administered only once within 48 h. The bacterial count is significantly diminished compared to the treatment by either W379 or anti-PBP2a-loaded alone microneedle patches. When administered twice within 48 h, no bacteria are identified. Further in vivo study also reveals that after two treatments of W379 and anti-PBP2a co-loaded PVP microneedle patches within 48 h, the bacterial colonies are undetectable in a type II diabetic mouse wound biofilm model. Taken together, W379 and anti-PBP2a co-loaded PVP microneedle patches hold great promise in treating wound biofilms.
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Affiliation(s)
- Yajuan Su
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Shatil S M Shahriar
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Syed Muntazir Andrabi
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Chenlong Wang
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Navatha Shree Sharma
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Yizhu Xiao
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Shannon L Wong
- Department of Surgery-Plastic Surgery, College of Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Guangshun Wang
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Jingwei Xie
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
- Department of Mechanical and Materials Engineering, College of Engineering, University of Nebraska Lincoln, Lincoln, NE, 68588, USA
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Phoka T, Thanuthanakhun N, Visitchanakun P, Dueanphen N, Wanichwecharungruang N, Leelahavanichkul A, Palaga T, Ruxrungtham K, Wanichwecharungruang S. Detachable-dissolvable-microneedle as a potent subunit vaccine delivery device that requires no cold-chain. Vaccine X 2023; 15:100398. [PMID: 37920235 PMCID: PMC10618702 DOI: 10.1016/j.jvacx.2023.100398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 10/07/2023] [Accepted: 10/16/2023] [Indexed: 11/04/2023] Open
Abstract
Although vaccine administration by microneedles has been demonstrated, delivery reliability issues have prevented their implementation. Through an ex vivo porcine skin experiment, we show visual evidence indicating that detachable dissolvable microneedles (DDMN) can deposit cargo into the dermis with insignificant loss of cargo to the stratum corneum. Using ovalbumin (OVA), a model antigen vaccine, as a cargo, the ex vivo experiments yielded a delivery efficiency of 86.08 ± 4.16 %. At room temperature, OVA could be stabilized for up to 35 days in DDMN made from hyaluronic acid and trehalose. The DDMN matrix could improve the denaturation temperature of the OVA from around 70-120 °C to over 150 °C, as demonstrated by differential scanning calorimetric analysis. In vivo delivery of OVA antigen into the mice's skin via DDMN elicited 10 times higher specific antibody responses compared to conventional intramuscular injection. We envision DDMN as an effective, precise dosing, intradermal vaccine delivery system that may require no cold-chain, offers a dose-sparing effect, and can be administered easily.
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Affiliation(s)
- Theerapat Phoka
- Center of Excellence in Materials and Bio-Interfaces, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | | | - Peerapat Visitchanakun
- Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
- Center of Excellence on Translational Research in Inflammation and Immunology (CETRII), Thailand
| | - Narintorn Dueanphen
- The Petrochemistry and Polymer Science Program, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | | | - Asada Leelahavanichkul
- Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
- Center of Excellence on Translational Research in Inflammation and Immunology (CETRII), Thailand
| | - Tanapat Palaga
- Center of Excellence in Materials and Bio-Interfaces, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
- Department of Microbiology, Faculty of Science, Chulalongkorn University Bangkok, Thailand
| | - Kiat Ruxrungtham
- Chula Vaccine Research Center (ChulaVRC) and School of Global Health, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
| | - Supason Wanichwecharungruang
- Center of Excellence in Materials and Bio-Interfaces, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
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Thantaviriya S, Kamanamool N, Sansureerungsikul T, Udompataikul M, Wanichwecharungruang S, Rojhirunsakool S. Efficacy and Safety of Detachable Microneedle Patch Containing Triamcinolone Acetonide in the Treatment of Inflammatory Acne. Clin Cosmet Investig Dermatol 2023; 16:1431-1441. [PMID: 37303985 PMCID: PMC10252967 DOI: 10.2147/ccid.s411378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 05/17/2023] [Indexed: 06/13/2023]
Abstract
Background Detachable microneedles (DMNs) are dissolvable microneedles that detach from the base during administration. The use of DMNs-containing steroids for acne has never been investigated. Methods Thirty-five patients with facial inflammatory acne were evaluated for acne treatment efficacy and safety of DMNs and DMNs containing triamcinolone acetonide (TA) via a 28-day randomized, double-blind, controlled trial. Four inflammatory acne lesions were selected from each participant and randomly treated with a single application of 700 µm DMNs containing 262.02 ± 15.62 µg TA (700DMNTA), 1000 µm DMNs containing 160.00 ± 34.92 µg TA (1000DMNTA), 700 µm DMN without TA (700DMN), and a control. Efficacy was measured by assessing physical grading, diameter, volume, erythema index, and melanin index. Safety was evaluated by assessing reports of adverse effects from patients and physicians. Results All three treatment groups achieved resolution of inflammatory acne significantly faster than the control group, with median times for resolution of 4.6, 5.25, 6.7, and 8.1 days in the 1000DMNTA, 700DMNTA, 700DMN, and control, respectively. When compared to the control group, the diameters and post-acne erythema of inflammatory acne were significantly reduced in the treatment groups. The 1000DMNTA decreased acne size and erythema more than other treatments. DMNTA also tended to decrease acne size and erythema more than DMN with no TA, but there was no statistically significant difference. All participants preferred DMN over conventional intralesional steroid injection due to less pain and self-application. No adverse effect was observed. Conclusion DMNTA is a safe, effective alternative treatment for inflammatory acne and significantly reduces post-acne erythema.
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Affiliation(s)
- Soraya Thantaviriya
- Department of Dermatology, Faculty of Medicine, Srinakharinwirot University, Bangkok, Thailand
| | - Nanticha Kamanamool
- Department of Preventive and Social Medicine, Faculty of Medicine, Srinakharinwirot University, Bangkok, Thailand
| | | | - Montree Udompataikul
- Department of Dermatology, Faculty of Medicine, Srinakharinwirot University, Bangkok, Thailand
| | | | - Salinee Rojhirunsakool
- Department of Dermatology, Faculty of Medicine, Srinakharinwirot University, Bangkok, Thailand
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Zaid Alkilani A, Abo-Zour H, Basheer HA, Abu-Zour H, Donnelly RF. Development and Evaluation of an Innovative Approach Using Niosomes Based Polymeric Microneedles to Deliver Dual Antioxidant Drugs. Polymers (Basel) 2023; 15:polym15081962. [PMID: 37112106 PMCID: PMC10145612 DOI: 10.3390/polym15081962] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 04/16/2023] [Accepted: 04/19/2023] [Indexed: 04/29/2023] Open
Abstract
Ascorbic acid (AA) and caffeine (CAFF) work to protect cells from ultraviolet (UV) radiation and slow down the photoaging process of the skin. However, cosmetic application of AA and CAFF is limited due to poor penetration across the skin and rapid oxidation of AA. The aim of this study was to design and evaluate the dermal delivery of dual antioxidants utilizing microneedles (MNs) loaded with AA and CAFF niosomes. The niosomal nanovesicles were prepared using the thin film method and had particle sizes ranging from 130.6-411.2 nm and a negative Zeta potential of around -35 mV. The niosomal formulation was then combined with polyvinylpyrrolidone (PVP) and polyethylene glycol 400 (PEG 400) to create an aqueous polymer solution. The best skin deposition of AA and CAFF was achieved with the formulation containing 5% PEG 400 (M3) and PVP. Furthermore, the role of AA and CAFF as antioxidants in preventing cancer formation has been well-established. Here we validated the antioxidant properties of ascorbic acid (AA) and caffeine (CAFF) in a novel niosomal formulation referred to as M3 by testing its ability to prevent H2O2-indued cell damage and apoptosis in MCF-7 breast cancer cells. Results showed that M3 was able to shield MCF-7 cells from H2O2 induced damage at concentrations below 2.1 µg/mL for AA and 1.05 µg/mL for CAFF, and also exhibited anticancer effects at higher concentrations of 210 µg/mL for AA and 105 µg/mL. The formulations were stable for two months at room temperature in terms of moisture and drug content. The use of MNs and niosomal carriers could be a promising approach for dermal delivery of hydrophilic drugs like AA and CAFF.
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Affiliation(s)
- Ahlam Zaid Alkilani
- Department of Pharmacy, Faculty of Pharmacy, Zarqa University, Zarqa 13110, Jordan
| | - Hadeel Abo-Zour
- Department of Pharmacy, Faculty of Pharmacy, Zarqa University, Zarqa 13110, Jordan
| | - Haneen A Basheer
- Department of Pharmacy, Faculty of Pharmacy, Zarqa University, Zarqa 13110, Jordan
| | - Hana Abu-Zour
- Department of Pharmacy, Faculty of Pharmacy, Zarqa University, Zarqa 13110, Jordan
| | - Ryan F Donnelly
- Medical Biology Centre, School of Pharmacy, Queen's University Belfast, Belfast BT7 1NN, UK
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Abstract
Wrinkled and loose skin resulting from collagen degradation along with fibers decreasing reflects the youth diminishing. Microneedles (MNs) have opened up new avenues for the development of painless and noninvasive transdermal drug delivery systems for facial rejuvenation. Encapsulated drugs or molecules are transmitted to targeted tissues via percutaneous microchannels, which eliminate potential gastric stimulation or first-pass metabolic effects, as well as boost patient compliance. Although MNs are considered effective and feasible therapeutic alternatives to metals, silicon, and polymers, traditional procedures with reduction processes continue to encounter methodological limitations. In recent years, promising additive manufacturing processes such as three-dimensional printing and two-photon polymerization manufacturing have been developed with the aim of overcoming the limitations by traditional processes to facilitate an efficient and economic production mode. This review summarizes the design, material selection, and manufacturing method for recently advanced MN systems. Furthermore, we also highlight specific polymeric or natural microneedle products, like hyaluronan, plant derivates, and vitamins, for esthetic applications in this review. Impact Statement In this review, the materials and manufactural routes of microneedles (MNs) are detailed. Moreover, similar to the diagnostic or therapeutic MNs, the feature of dispensation with training and ready-to-use is perfect for beautification and anti-aging, which necessitate repeated and long-term usage. Furthermore, the specific polymeric or natural products for esthetic applications of MNs are highlighted in this review.
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Affiliation(s)
- Xiaoqi Huang
- Department of Plastic and Reconstruction Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Qiang Chang
- Department of Plastic and Reconstruction Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Jian-Hua Gao
- Department of Plastic and Reconstruction Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Feng Lu
- Department of Plastic and Reconstruction Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
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Kim HM, Byun KA, Oh S, Yang JY, Park HJ, Chung MS, Son KH, Byun K. A Mixture of Topical Forms of Polydeoxyribonucleotide, Vitamin C, and Niacinamide Attenuated Skin Pigmentation and Increased Skin Elasticity by Modulating Nuclear Factor Erythroid 2-like 2. Molecules 2022; 27:molecules27041276. [PMID: 35209068 PMCID: PMC8879610 DOI: 10.3390/molecules27041276] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 02/11/2022] [Accepted: 02/12/2022] [Indexed: 12/14/2022]
Abstract
It is well-known that increased oxidative stress caused by ultraviolet B (UV-B) radiation induces melanogenesis and activates metalloproteinases (MMPs), which degrade collagen and elastin fibers, leading to decreased skin elasticity. Various antioxidant agents, such as vitamin C and niacinamide, have been evaluated for use as treatments for photoaging or skin pigmentation. In this study, we evaluated the ability of a topical liquid formula of polydeoxyribonucleotide (PDRN), vitamin C, and niacinamide (PVN) delivered via a microneedling therapy system (MTS) to attenuate photoaging and pigmentation by increasing nuclear factor erythroid 2-like 2 (NRF2)/heme oxygenase-1 (HO-1) and decreasing MMP expression in a UV-B-radiated animal model. The effects of the PVN were compared with those of individual PDRN and hydroquinone (HQ) compounds. The expression of NRF2/HO-1 significantly increased in response to HQ, PDRN, and PVN in UV-B-radiated animal skin. The activity of nicotinamide adenine dinucleotide phosphate hydrogen oxidase decreased in response to HQ, PDRN, and PVN, and the superoxide dismutase activity increased. The expression of tumor protein p53 and microphthalmia-associated transcription factor and tyrosinase activity decreased in response to HQ, PDRN, and PVN, and this decrease was accompanied by decreased melanin content in the skin. The expression of nuclear factor kappa-light-chain enhancer of activated B cells and MMP2/3/9 decreased in response to HQ, PDRN, and PVN in UV-B-radiated skin. However, the expression of collagen type I α1 chain and the amount of collagen fibers that were evaluated by Masson’s trichrome staining increased in response to HQ, PDRN, and PVN. The contents of elastin fibers, fibrillin 1/2 and fibulin 5 increased in response to HQ, PDRN, and PVN. In conclusion, PVN delivered via MTS led to decreased melanogenesis and destruction of collagen and elastin fibers by MMPs, and, thus, PVN decreased skin pigmentation and increased skin elasticity.
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Affiliation(s)
- Hyoung Moon Kim
- Department of Anatomy & Cell Biology, College of Medicine, Gachon University, Incheon 21936, Korea; (H.M.K.); (K.-A.B.)
| | - Kyung-A Byun
- Department of Anatomy & Cell Biology, College of Medicine, Gachon University, Incheon 21936, Korea; (H.M.K.); (K.-A.B.)
- Functional Cellular Networks Laboratory, Graduate School and Lee Gil Ya Cancer and Diabetes Institute, College of Medicine, Gachon University, Incheon 21999, Korea; (S.O.); (J.Y.Y.)
| | - Seyeon Oh
- Functional Cellular Networks Laboratory, Graduate School and Lee Gil Ya Cancer and Diabetes Institute, College of Medicine, Gachon University, Incheon 21999, Korea; (S.O.); (J.Y.Y.)
| | - Jin Young Yang
- Functional Cellular Networks Laboratory, Graduate School and Lee Gil Ya Cancer and Diabetes Institute, College of Medicine, Gachon University, Incheon 21999, Korea; (S.O.); (J.Y.Y.)
| | - Hyun Jun Park
- Maylin Anti-Aging Center Apgujeong, Seoul 06005, Korea;
| | | | - Kuk Hui Son
- Department of Thoracic and Cardiovascular Surgery, Gil Medical Center, Gachon University, Incheon 21565, Korea
- Correspondence: (K.H.S.); (K.B.); Tel.: +82-32-460-3666 (K.H.S.); +82-32-899-6511 (K.B.)
| | - Kyunghee Byun
- Department of Anatomy & Cell Biology, College of Medicine, Gachon University, Incheon 21936, Korea; (H.M.K.); (K.-A.B.)
- Functional Cellular Networks Laboratory, Graduate School and Lee Gil Ya Cancer and Diabetes Institute, College of Medicine, Gachon University, Incheon 21999, Korea; (S.O.); (J.Y.Y.)
- Correspondence: (K.H.S.); (K.B.); Tel.: +82-32-460-3666 (K.H.S.); +82-32-899-6511 (K.B.)
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