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Gil-Carrasco F, Alvarez-Ascencio D, Tolosa-Tort P, Alvarez-Padilla M, Jimenez-Roman J, Castillejos-Chevez A. Outcomes of trabeculectomy with polyvinylpyrrolidone collagen versus mitomycin in primary open angle glaucoma. 36-month follow-up. ACTA ACUST UNITED AC 2020; 96:202-209. [PMID: 33342630 DOI: 10.1016/j.oftal.2020.09.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 09/02/2020] [Accepted: 09/05/2020] [Indexed: 10/22/2022]
Abstract
PURPOSE Describe and compare the effects of intraoperative application of Polyvinylpyrrolidone Collagen (PVP) versus Mitomycin C (MMC) on the pattern of change in mean IOP reduction and mean number of medications over 36-months follow-up in patients with primary open angle glaucoma (POAG) undergoing trabeculectomy. METHODS Prospective, randomized, comparative study. Twenty-six eyes of 26 patients with POAG and no previous incisional glaucoma surgery underwent trabeculectomy and were randomized to PVP or MMC and completed a 36-month follow-up. Main outcome measures were IOP and number of glaucoma medications. Multivariate longitudinal analysis was performed by fitting a linear trend model adjusting for baseline response for the IOP outcome and a log-linear regression model with within-subject associations for the number of hypotensive medications outcome. Sensitivity analysis was performed to assess lower and higher order polynomial trends over time in IOP. RESULTS The univariate analysis revealed that the mean IOP reduction from baseline to 36 months was 7.62mmHg (3.05; 12.18) in the MMC group and 8.15mmHg (-0.64; 16.95) in the PVP group. Mean percentage IOP reduction from baseline was 37.09% (15.93; 58.17) and 36.08% (5.16; 67.20) in the PVP group. Mean change in number of medications from baseline to 36 months was -0.92 medications (-3.38; +1.54) for the MMC group and -1 medication (-3.12; +1.12) for the PVP group. Both groups had a statistically significant decline in mean IOP over the follow-up period (p<0.001) but there was no discernible difference between the two exposure groups in the rate of change in IOP (p=0.5975). Sensitivity analysis showed that a linear trend model is adequate to describe the IOP reduction over the follow-up period. Both groups had a statistically significant change in the number of hypotensive medications used between baseline and month 36 (p<0.05) but there was no discernible difference between exposure groups (p=0.2917). Both the PVP and MMC groups showed an initial reduction in number of medications until month 12 and a relatively linear increase towards month 36. A longer follow-up may be warranted to reveal differences in the number of medications between the two exposure groups. Postoperative complications were less frequent in the PVP group. CONCLUSIONS The use of PVP during trabeculectomy achieves and maintains a statistically significant IOP reduction from baseline to 36 months and decreases the number of glaucoma medications. Secondary outcome measures showed a lower incidence of adverse events in the PVP group.
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Affiliation(s)
- F Gil-Carrasco
- Glaucoma Department, Asociación Para Evitar la Ceguera en México, IAP, Mexico City, Mexico
| | - D Alvarez-Ascencio
- Glaucoma Department, Asociación Para Evitar la Ceguera en México, IAP, Mexico City, Mexico.
| | - P Tolosa-Tort
- Glaucoma Department, Asociación Para Evitar la Ceguera en México, IAP, Mexico City, Mexico
| | - M Alvarez-Padilla
- Glaucoma Department, Asociación Para Evitar la Ceguera en México, IAP, Mexico City, Mexico
| | - J Jimenez-Roman
- Glaucoma Department, Asociación Para Evitar la Ceguera en México, IAP, Mexico City, Mexico
| | - A Castillejos-Chevez
- Glaucoma Department, Asociación Para Evitar la Ceguera en México, IAP, Mexico City, Mexico
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Sobczak-Kupiec A, Drabczyk A, Kudłacik-Kramarczyk S, Tyliszczak B. Hydroxyapatite powders prepared using two different methods as modifying agents of PVP/collagen composites designed for biomedical applications. INT J POLYM MATER PO 2020. [DOI: 10.1080/00914037.2020.1785458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Agnieszka Sobczak-Kupiec
- Cracow university of Technology, Faculty of Materials Engineering and Physics, Institute of Materials Science, Krakow, Poland
| | - Anna Drabczyk
- Cracow university of Technology, Faculty of Materials Engineering and Physics, Institute of Materials Science, Krakow, Poland
| | - Sonia Kudłacik-Kramarczyk
- Cracow university of Technology, Faculty of Materials Engineering and Physics, Institute of Materials Science, Krakow, Poland
| | - Bozena Tyliszczak
- Cracow university of Technology, Faculty of Materials Engineering and Physics, Institute of Materials Science, Krakow, Poland
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Cell-free scaffold from jellyfish Cassiopea andromeda (Cnidaria; Scyphozoa) for skin tissue engineering. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 111:110748. [PMID: 32279751 DOI: 10.1016/j.msec.2020.110748] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 01/31/2020] [Accepted: 02/15/2020] [Indexed: 12/17/2022]
Abstract
Disruption of the continuous cutaneous membrane in the integumentary system is considered a health problem of high cost for any nation. Several attempts have been made for developing skin substitutes in order to restore injured tissue including autologous implants and the use of scaffolds based on synthetic and natural materials. Current biomaterials used for skin tissue repair include several scaffold matrices types, synthetic or natural, absorbable, degradable or non-degradable polymers, porous or dense scaffolds, and cells capsulated in hydrogels or spheroids systems so forth. These materials have advantages and disadvantages and its use will depend on the desired application. Recently, marine organisms such as jellyfish have attracted renewed interest, because both its composition and structure resemble the architecture of human dermic tissue. In this context, the present study aims to generate scaffolds from Cassiopea andromeda (C. andromeda), with application in skin tissue engineering, using a decellularization process. The obtained scaffold was studied by infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential scanning calorimetry analysis (DSC), and scanning electron microscopy (SEM). Crystal violet staining and DNA quantification assessed decellularization effectiveness while the biocompatibility of scaffold was determined with human dermic fibroblasts. Results indicated that the decellularization process reduce native cell population leading to 70% reduction in DNA content. In addition, SEM showed that the macro and microstructure of the collagen I-based scaffold were preserved allowing good adhesion and proliferation of human dermic fibroblasts. The C. andromeda scaffold mimics human skin and therefore represents great potential for skin tissue engineering.
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Demeter M, Călina I, Vancea C, Şen M, Kaya MGA, Mănăilă E, Dumitru M, Meltzer V. E-Beam Processing of Collagen-Poly(N-vinyl-2-pyrrolidone) Double-Network Superabsorbent Hydrogels: Structural and Rheological Investigations. Macromol Res 2019. [DOI: 10.1007/s13233-019-7041-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Design of hybrid molecular brushes with reversible surface adaptability on exposure to specific solvents. Biointerphases 2018; 13:041006. [PMID: 30001629 DOI: 10.1116/1.5029479] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Hybrid molecular brushes (HMBs) are macromolecules made of a linear backbone and polymeric side chains that differ in their chemical nature. The authors developed a new method of synthesis of HMB with chitosan (CHI) backbone. In the first step, chitosan-graft-polylactide (CHI-g-PLA) was synthesized by interfacial ring opening polymerization of lactide initiated from CHI. CHI-g-PLA is characterized for its molecular weight and structure. In the second step, polyvinylpyrrolidone (PNVP) or polyacrylamide (PAAm) is grafted by radical polymerization from the CHI in CHI-g-PLA to form CHI-g-PLA-g-PNVP and CHI-g-PLA-g-PAAm. This results in the formation of HMB, with hydrophobic PLA and hydrophilic PNVP or PAAm side chains grafted to CHI. The chemical structure and thermal behavior of the HMBs are characterized. The morphology of CHI-g-PLA as well as the HMBs is determined using atomic force microscopy (AFM). Both the HMBs tethered to separate surfaces exhibit reversible switching between the hydrophilic and hydrophobic polymers on exposure to specific solvents. This is studied by AFM and water contact angle measurements. Hence, the authors developed a method for synthesis of HMB that can be applied for surface modification.
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Demeter M, Virgolici M, Vancea C, Scarisoreanu A, Kaya MGA, Meltzer V. Network structure studies on γ–irradiated collagen–PVP superabsorbent hydrogels. Radiat Phys Chem Oxf Engl 1993 2017. [DOI: 10.1016/j.radphyschem.2016.09.029] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Leyva-Gómez G, Santillan-Reyes E, Lima E, Madrid-Martínez A, Krötzsch E, Quintanar-Guerrero D, Garciadiego-Cázares D, Martínez-Jiménez A, Hernández Morales M, Ortega-Peña S, Contreras-Figueroa ME, Cortina-Ramírez GE, Abarca-Buis RF. A novel hydrogel of poloxamer 407 and chitosan obtained by gamma irradiation exhibits physicochemical properties for wound management. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 74:36-46. [PMID: 28254305 DOI: 10.1016/j.msec.2016.12.127] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 12/07/2016] [Accepted: 12/16/2016] [Indexed: 11/25/2022]
Abstract
Application of polymers cross-linked by gamma irradiation on cutaneous wounds has resulted in the improvement of healing. Chitosan (CH) and poloxamer 407 (P407)-based hydrogels confer different advantages in wound management. To combine the properties of both compounds, a gamma-irradiated mixture of 0.75/25% (w/w) CH and P407, respectively, was obtained (CH-P), and several physical, chemical, and biological analyses were performed. Notably, gamma radiation induced changes in the mixture's thermal behavior, viscosity, and swelling, and exhibited stability at neutral pH. The thermal reversibility provided by P407 and the bacteriostatic effect of CH were maintained. Mice full-thickness wounds treated with CH-P diminished the wound area during the first days. Consequently, with this treatment, increased levels of macrophages, α-SMA, and collagen deposition in wounds were observed, indicating a more mature scar tissue. In conclusion, the new hydrogel CH-P, at physiologic pH, combined the beneficial characteristics of both polymers and produced new properties for wound management.
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Affiliation(s)
- Gerardo Leyva-Gómez
- Laboratory of Connective Tissue, Centro Nacional de Investigación y Atención de Quemados, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra, Mexico City, Mexico.
| | - Erika Santillan-Reyes
- Laboratory of Connective Tissue, Centro Nacional de Investigación y Atención de Quemados, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra, Mexico City, Mexico.
| | - E Lima
- Departamento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Mexico City, Mexico.
| | - Abigail Madrid-Martínez
- Laboratory of Connective Tissue, Centro Nacional de Investigación y Atención de Quemados, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra, Mexico City, Mexico.
| | - E Krötzsch
- Laboratory of Connective Tissue, Centro Nacional de Investigación y Atención de Quemados, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra, Mexico City, Mexico.
| | - D Quintanar-Guerrero
- Laboratorio de Investigación y Posgrado en Tecnología Farmacéutica, Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, State of Mexico, Mexico.
| | - David Garciadiego-Cázares
- Unidad de Ingeniería de Tejidos y Medicina Regenerativa, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra, Mexico City, Mexico.
| | - Alejandro Martínez-Jiménez
- Laboratory of Connective Tissue, Centro Nacional de Investigación y Atención de Quemados, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra, Mexico City, Mexico.
| | - M Hernández Morales
- Departamento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Mexico City, Mexico.
| | - Silvestre Ortega-Peña
- Laboratorio de Infectología, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra, Mexico City, Mexico.
| | - M E Contreras-Figueroa
- Bioterio y Cirugía Experimental, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra, Mexico City, Mexico.
| | - G E Cortina-Ramírez
- Departamento de Biología, Instituto Nacional de Investigaciones Nucleares, Mexico City, Mexico.
| | - René Fernando Abarca-Buis
- Laboratory of Connective Tissue, Centro Nacional de Investigación y Atención de Quemados, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra, Mexico City, Mexico.
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Ma H, Shen J, Yang Q, Zhou J, Xia S, Cao J. Effect of the Introduction of Fish Collagen on the Thermal and Mechanical Properties of Poly(lactic acid). Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b02969] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Hui Ma
- College of Material and Textile
Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, People’s Republic of China
| | - Jiajia Shen
- College of Material and Textile
Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, People’s Republic of China
| | - Qun Yang
- College of Material and Textile
Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, People’s Republic of China
| | - Jie Zhou
- College of Material and Textile
Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, People’s Republic of China
| | - Shuangshuang Xia
- College of Material and Textile
Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, People’s Republic of China
| | - Jianda Cao
- College of Material and Textile
Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, People’s Republic of China
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