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Wang B, Wang X, Kenneth A, Drena A, Pacheco A, Kalvin L, Ibrahim ES, Rossi PJ, Thatcher K, Lincoln J. Developing small-diameter vascular grafts with human amniotic membrane: long-term evaluation of transplantation outcomes in a small animal model. Biofabrication 2023; 15. [PMID: 36626826 DOI: 10.1088/1758-5090/acb1da] [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: 10/05/2022] [Accepted: 01/10/2023] [Indexed: 01/11/2023]
Abstract
While current clinical utilization of large vascular grafts for vascular transplantation is encouraging, tissue engineering of small grafts still faces numerous challenges. This study aims to investigate the feasibility of constructing a small vascular graft from decellularized amniotic membranes (DAMs). DAMs were rolled around a catheter and each of the resulting grafts was crosslinked with (a) 0.1% glutaraldehyde; (b) 1-ethyl-3-(3-dimethylaminopropyl) crbodiimidehydro-chloride (20 mM)-N-hydroxy-succinimide (10 mM); (c) 0.5% genipin; and (d) no-crosslinking, respectively. Our results demonstrated the feasibility of using a rolling technique followed by lyophilization to transform DAM into a vessel-like structure. The genipin-crosslinked DAM graft showed an improved integrated structure, prolonged stability, proper mechanical property, and superior biocompatibility. After transplantation in rat abdominal aorta, the genipin-crosslinked DAM graft remained patent up to 16 months, with both endothelial and smooth muscle cell regeneration, which suggests that the genipin-crosslinked DAM graft has great potential to beimplementedas a small tissue engineered graft for futurevasculartransplantation.
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Affiliation(s)
- Bo Wang
- Joint Department of Biomedical Engineering, Marquette University and the Medical College of Wisconsin, Milwaukee, WI 53226, United States of America
| | - Xiaolong Wang
- Joint Department of Biomedical Engineering, Marquette University and the Medical College of Wisconsin, Milwaukee, WI 53226, United States of America
| | - Allen Kenneth
- Biomedical Resource Center, Medical College of Wisconsin, Milwaukee, WI 53226, United States of America
| | - Alexander Drena
- Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, United States of America
| | - Arsenio Pacheco
- Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, United States of America
| | - Lindsey Kalvin
- Department of Medicine, Division of Cardiovascular Medicine, Medical College of Wisconsin, Milwaukee, WI 53226, United States of America
| | - Ei-Sayed Ibrahim
- Department of Radiology, Medical College of Wisconsin, Milwaukee, WI 53226, United States of America
| | - Peter J Rossi
- Heart and Vascular Center, Froedtert Hospital, Milwaukee, WI 53226, United States of America
| | - Kaitlyn Thatcher
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI 53226, United States of America
| | - Joy Lincoln
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI 53226, United States of America
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Doudi S, Barzegar M, Taghavi EA, Eini M, Ehterami A, Stokes K, Alexander JS, Salehi M. Applications of acellular human amniotic membrane in regenerative medicine. Life Sci 2022; 310:121032. [DOI: 10.1016/j.lfs.2022.121032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/25/2022] [Accepted: 09/30/2022] [Indexed: 11/06/2022]
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Wang B, Li W, Harrison J. An Evaluation of Wound Healing Efficacy of a Film Dressing Made from Polymer-integrated Amnion Membrane. Organogenesis 2020; 16:126-136. [PMID: 33164697 PMCID: PMC7714469 DOI: 10.1080/15476278.2020.1844507] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 09/01/2020] [Accepted: 09/09/2020] [Indexed: 10/23/2022] Open
Abstract
A film dressing is an easy and common wound management, which is flexible to cover many types of superficial injuries. In a recent study, we developed a scaffold from poly (1,8-octanediolco-citrate) incorporated decellularized amnion membrane (DAM-POC). The DAM-POC scaffold was biocompatible and could enhance soft and hard tissue regeneration when applied to repair the cleft palate in rat. The efficacy of the DAM-POC scaffold in oral repair had led us to hypothesize that it could be employed extensively in the medical field as a wound dressing. This study aimed to investigate the feasibility and efficacy of the DAM-POC scaffold as a film dressing in accelerating wound healing when applied in multiple tissue injuries. Our results demonstrated that both the DAM and DAM-POC scaffolds were biocompatible and anti-adhesive without causing severe foreign body reactions when covering wounds in abdominal wall, back muscle, tibia bone, and liver. In addition, the DAM-POC scaffold was superior to the DAM scaffold in reducing inflammation, preventing fibrosis, and regenerating tissues. In conclusion, the DAM-POC scaffold might potentially be adopted as a film dressing in a wide range of therapeutic applications and healing situations to protect the damaged tissues from the external environment and prevent infections.
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Affiliation(s)
- Bo Wang
- Joint Department of Biomedical Engineering, Marquette University and Medical College of Wisconsin, Milwaukee, WI, USA
| | - Wuwei Li
- Department of Oral and Maxillofacial Surgery, School of Stomatology, Dalian Medical University, Dalian, China
| | - Justin Harrison
- Department of Biological Sciences, Alabama State University, Montgomery, AL, USA
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Li W, Fu Y, Jiang B, Lo AY, Ameer GA, Barnett C, Wang B. Polymer-integrated amnion scaffold significantly improves cleft palate repair. Acta Biomater 2019; 92:104-114. [PMID: 31102764 DOI: 10.1016/j.actbio.2019.05.035] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 04/08/2019] [Accepted: 05/13/2019] [Indexed: 11/17/2022]
Abstract
Cleft palate is a common oral and craniomaxillofacial birth defect. As the ideal surgery time is shortly after birth, clinical treatments should result in minimal disruption of theskeleton to allow tissue growth in children. A tissue-engineered graft was created in this study for cleft palate repair by integrating poly(1,8-octamethylene-citrate) (POC) with a decellularized amnion membrane (DAM-POC) to incorporate the advantages of both the synthetic polymer and the native tissue. The success of POC incorporation was confirmed by laser-induced breakdown spectroscopy and fluorescence detection. The DAM-POC scaffold showed a certain level of structure collapse and lower stiffness but better resistance to enzyme digestion than the native amnion and DAM scaffold. The DAM-POC scaffold is cell compatible when seeded with mesenchymal stem cells, as evidenced by adequate cell viability and improved alkaline phosphatase (ALP) activity and calcium deposit. A large palate defect was first surgically created in a young rat model and then repaired with the DAM-POC scaffold. Eight weeks postsurgery, histological study and CT scans showed nearly complete healing of both soft and hard tissues. In conclusion, we developed a cell-free, resorbable graft by incorporating and integrating a synthetic polymer with a human DAM. When the DAM-POC scaffold was applied to repair a large palate defect in young rats, it showed adequate biocompatibility as evidenced by its effectiveness in guiding hard and soft tissue regeneration and minimum interference with natural growth and palate development of rats. STATEMENT OF SIGNIFICANCE: Proper restoration of severe cleft palate remains a major challenge because of insufficient autologous soft tissues to close the open wounds, thereby causing high tension at the surgical junction, secondary palatal fistulas, wound contraction, scar tissue formation, and facial growth disturbances. In this study, we have developed a tissue-engineered graft through incorporating and integrating a synthetic polymer with the human amnion membrane for cleft palate repair. The significance of this study lies in our ability to develop a cell-free, resorbable graft that can provide a less surgically invasive option to cover the open defect and support palate regeneration and tissue growth. This technique could potentially advance soft and hard tissue regeneration in children with birth craniomaxillofacial defects.
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Affiliation(s)
- Wuwei Li
- Department of Oral and Maxillofacial Surgery, School of Stomatology, Dalian Medical University, Liaoning 116001, China
| | - Yuqian Fu
- Department of Oral and Maxillofacial Surgery, School of Stomatology, Dalian Medical University, Liaoning 116001, China
| | - Bin Jiang
- Biomedical Engineering Department, Northwestern University, Evanston, IL 60201, United States; Center for Advanced Regenerative Engineering, Northwestern University, Evanston, IL 60201, United States
| | - Aaron Y Lo
- Biomedical Engineering Department, Northwestern University, Evanston, IL 60201, United States; Center for Advanced Regenerative Engineering, Northwestern University, Evanston, IL 60201, United States
| | - Guillermo A Ameer
- Biomedical Engineering Department, Northwestern University, Evanston, IL 60201, United States; Center for Advanced Regenerative Engineering, Northwestern University, Evanston, IL 60201, United States
| | - Cleon Barnett
- Department of Physical Sciences, Alabama State University, Montgomery, AL 36104, United States
| | - Bo Wang
- Joint Department of Biomedical Engineering, Marquette University and the Medical College of Wisconsin, Milwaukee, WI 53226, United States.
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Liu PL, Chong IW, Lee YC, Tsai JR, Wang HM, Hsieh CC, Kuo HF, Liu WL, Chen YH, Chen HL. Anti-inflammatory Effects of Resveratrol on Hypoxia/Reoxygenation-Induced Alveolar Epithelial Cell Dysfunction. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:9480-9487. [PMID: 26466890 DOI: 10.1021/acs.jafc.5b01168] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Reducing oxidative stress is crucial to prevent hypoxia-reoxygenation (H/R)-induced lung injury. Resveratrol has excellent antioxidant and anti-inflammatory effects, and this study investigated its role in H/R-induced type II pneumocyte dysfunction. H/R conditions increased expression of inflammatory cytokines including interleukin (IL)-1β (142.3 ± 21.2%, P < 0.05) and IL-6 (301.9 ± 35.1%, P < 0.01) in a type II alveolar epithelial cell line (A549), while the anti-inflammatory cytokine IL-10 (64.6 ± 9.8%, P < 0.05) and surfactant proteins (SPs) decreased. However, resveratrol treatment effectively inhibited these effects. H/R significantly activated an inflammatory transcription factor, nuclear factor (NF)-κB, while resveratrol significantly inhibited H/R-induced NF-κB transcription activities. To the best of our knowledge, this is the first study showing resveratrol-mediated reversal of H/R-induced inflammatory responses and dysfunction of type II pneumocyte cells in vitro. The effects of resveratrol were partially mediated by promoting SP expression and inhibiting inflammation with NF-κB pathway involvement. Therefore, our study provides new insights into mechanisms underlying the action of resveratrol in type II pneumocyte dysfunction.
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Affiliation(s)
- Po-Len Liu
- Department of Respiratory Therapy, Department of Fragrance and Cosmetic Science, College of Medicine, Kaohsiung Medical University , Kaohsiung 807, Taiwan
| | - Inn-Wen Chong
- Department of Respiratory Therapy, Department of Fragrance and Cosmetic Science, College of Medicine, Kaohsiung Medical University , Kaohsiung 807, Taiwan
- Department of Pediatrics, Department of Internal Medicine, Department of Chest Surgery, Division of Cardiovascular Surgery, Department of Surgery, Kaohsiung Medical University Hospital , Kaohsiung 807, Taiwan
| | - Yi-Chen Lee
- Department of Respiratory Therapy, Department of Fragrance and Cosmetic Science, College of Medicine, Kaohsiung Medical University , Kaohsiung 807, Taiwan
| | - Jong-Rung Tsai
- Department of Respiratory Therapy, Department of Fragrance and Cosmetic Science, College of Medicine, Kaohsiung Medical University , Kaohsiung 807, Taiwan
- Department of Pediatrics, Department of Internal Medicine, Department of Chest Surgery, Division of Cardiovascular Surgery, Department of Surgery, Kaohsiung Medical University Hospital , Kaohsiung 807, Taiwan
| | - Hui-Min Wang
- Department of Respiratory Therapy, Department of Fragrance and Cosmetic Science, College of Medicine, Kaohsiung Medical University , Kaohsiung 807, Taiwan
| | - Chong-Chao Hsieh
- Department of Pediatrics, Department of Internal Medicine, Department of Chest Surgery, Division of Cardiovascular Surgery, Department of Surgery, Kaohsiung Medical University Hospital , Kaohsiung 807, Taiwan
| | - Hsuan-Fu Kuo
- Department of Internal Medicine, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung Medical University Hospital, Kaohsiung Medical University , Kaohsiung 801, Taiwan
| | - Wei-Lun Liu
- Department of Intensive Care Medicine, Chi Mei Medical Center , Tainan 736, Taiwan
| | - Yung-Hsiang Chen
- Graduate Institute of Integrated Medicine, College of Chinese Medicine, China Medical University , Taichung 404, Taiwan
- Department of Medical Research, China Medical University Hospital , Taichung 404, Taiwan
- Department of Psychology, College of Medical and Health Science, Asia University , Taichung 413, Taiwan
| | - Hsiu-Lin Chen
- Department of Respiratory Therapy, Department of Fragrance and Cosmetic Science, College of Medicine, Kaohsiung Medical University , Kaohsiung 807, Taiwan
- Department of Pediatrics, Department of Internal Medicine, Department of Chest Surgery, Division of Cardiovascular Surgery, Department of Surgery, Kaohsiung Medical University Hospital , Kaohsiung 807, Taiwan
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Mohammadi AA, Johari HG, Eskandari S. Effect of amniotic membrane on graft take in extremity burns. Burns 2013; 39:1137-41. [DOI: 10.1016/j.burns.2013.01.017] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 01/20/2013] [Accepted: 01/22/2013] [Indexed: 11/29/2022]
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George UM, Ashna U, Kumar SSP, Nandkumar AM. Effect of tobacco extract on surfactant synthesis and its reversal by retinoic acid-role of cell-cell interactions in vitro. In Vitro Cell Dev Biol Anim 2013; 49:260-9. [PMID: 23508709 DOI: 10.1007/s11626-013-9595-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2012] [Accepted: 02/25/2013] [Indexed: 11/30/2022]
Abstract
Tobacco induces oxidative stress in the alveolar epithelium and causes its damage. Retinoic acid (RA) has a cardinal role in alveolar cell growth, differentiation, and maturation. The aim of the study was to investigate the role of cell-cell interactions and whether RA could reverse the effect of tobacco extract on epithelial function as expressed by surfactant synthesis. For this, an in vitro model, which provides multiple cell type interactions, as seen in vivo, was used. We had used the major lung cell types, alveolar epithelial and mesenchymal cells represented by the cell lines A549 (human lung adenocarcinoma cell line), and human fetal lung fibroblast-1 (HFL-1) for developing the monoculture and co-culture systems and studied the effect of tobacco extract and retinoic acid. The effect of tobacco and retinoic acid both singly and in combination on proliferation and surfactant synthesis was analyzed. Retinoic acid induced proliferation and upregulated surfactant synthesis in monocultures and co-cultures. Tobacco extract at 100 μg/ml concentration decreased A549 proliferation and upregulated surfactant protein mRNA expression. In co-cultures treated with tobacco extract (100 μg/ml), retinoic acid (1 μM), regulated cell proliferation, and surfactant protein mRNA expression vis-à-vis the monoculture system. This clearly points to the fact that cell-cell interactions modulate the effect of additives or stimulants and help in assessing the in vivo combinatorial responses in vitro and that the retinoic acid effect is regenerative.
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Affiliation(s)
- U Mereena George
- Division of Microbiology, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Science and Technology, Poojappura P.O, Thiruvananthapuram, Kerala, India
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8
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Yang L, Shirakata Y, Tokumaru S, Xiuju D, Tohyama M, Hanakawa Y, Hirakawa S, Sayama K, Hashimoto K. Living skin equivalents constructed using human amnions as a matrix. J Dermatol Sci 2009; 56:188-95. [DOI: 10.1016/j.jdermsci.2009.09.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Revised: 09/24/2009] [Accepted: 09/24/2009] [Indexed: 12/01/2022]
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9
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Berndt-Weis ML, Kauri LM, Williams A, White P, Douglas G, Yauk C. Global transcriptional characterization of a mouse pulmonary epithelial cell line for use in genetic toxicology. Toxicol In Vitro 2009; 23:816-33. [PMID: 19406224 DOI: 10.1016/j.tiv.2009.04.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2009] [Revised: 04/17/2009] [Accepted: 04/20/2009] [Indexed: 02/02/2023]
Abstract
Prior to its application for in vitro toxicological assays, thorough characterization of a cell line is essential. The present study uses global transcriptional profiling to characterize a lung epithelial cell line (FE1) derived from MutaMouse [White, P.A., Douglas, G.R., Gingerich, J., Parfett, C., Shwed, P., Seligy, V., Soper, L., Berndt, L., Bayley, J., Wagner, S., Pound, K., Blakey, D., 2003. Development and characterization of a stable epithelial cell line from Muta Mouse lung. Environmental and Molecular Mutagenesis 42, 166-184]. Results presented here demonstrate the origin of the FE1 lung cell line as epithelial, presenting both type I and type II alveolar phenotype. An assessment of toxicologically-relevant genes, including those involved in the response to stress and stimuli, DNA repair, cellular metabolism, and programmed cell death, revealed changes in expression of 22-27% of genes in one or more culture type (proliferating and static FE1 cultures, primary epithelial cultures) compared with whole lung isolates. Gene expression analysis at 4 and 24h following benzo(a)pyrene exposure revealed the induction of cyp1a1, cyp1a2, and cyp1b1 in FE1 cells and lung isolates. The use of DNA microarrays for gene expression profiling allows an improved understanding of global, coordinated cellular events arising in cells under different physiological conditions. Taken together, these data indicate that the FE1 cell line is derived from a cell type relevant to toxic responses in vivo, and shows some similarity in response to chemical insult as the original tissue.
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Affiliation(s)
- M Lynn Berndt-Weis
- Environmental Health Sciences and Research Bureau, Health Canada, Ottawa, Ontario, Canada
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10
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Wilshaw SP, Kearney JN, Fisher J, Ingham E. Production of an acellular amniotic membrane matrix for use in tissue engineering. ACTA ACUST UNITED AC 2006; 12:2117-29. [PMID: 16968153 DOI: 10.1089/ten.2006.12.2117] [Citation(s) in RCA: 167] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A clinical need exists for an immunologically compatible surgical patch with a wide range of uses including soft tissue replacement, body wall repair, cardiovascular applications, and as a wound dressing. This study aimed to produce an acellular matrix from human amniotic membrane for future assessment as a surgical patch and a delivery system for epithelial cells. A novel detergent-based protocol was modified to remove all cellular components from amnion to render it non-immunogenic. Amnion was harvested within 24 h after elective caesarean section (n = 12). One sample group remained fresh, whereas the other was treated with 0.03% (w/v) sodium dodecyl sulphate, with hypotonic buffer and protease inhibitors, nuclease treatment, and terminal sterilization, using peracetic acid (0.1% v/v). Fresh and treated amnion was analyzed histologically for the presence of cells, deoxyribonucleic acid (DNA), collagen, glycosaminoglycans (GAGs), and elastin. Quantitative analysis was performed to determine levels of GAGs, elastin, hydroxyproline, denatured collagen, and DNA. The biomechanical properties of the membrane were determined using uniaxial tensile testing to failure. Histological analysis of treated human amnion showed complete removal of cellular components from the tissue; the histoarchitecture remained intact. All major structural components of the matrix were retained, including collagen type IV and I, laminin, and fibronectin. Differences were observed between fresh and decellularized amnion in matrix hydroxyproline (34.7 microg/mg vs 49.7 microg/mg), GAG (42.5 microg/mg vs 85.4 microg/mg), denatured collagen (2.2 microg/mg vs 1.7 microg/mg), and elastin (359.2 microg/mg vs 490.8 microg/mg) content. DNA content was diminished after treatment. Acellular matrices were biocompatible, cells grew in contact, and there was no decrease in cell viability after incubation with soluble tissue extracts. In addition, no significant reduction in ultimate tensile strength, extensibility, or elasticity was found after decellularization. Removal of the cellular components should eliminate immunological rejection. The resulting matrix was biocompatible in vitro and exhibited no adverse effects on cell morphology or viability.
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Affiliation(s)
- Stacy-Paul Wilshaw
- Institute of Medical and Biological Engineering, University of Leeds, Leeds, United Kingdom.
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Wilshaw SP, Kearney JN, Fisher J, Ingham E. Production of an Acellular Amniotic Membrane Matrix for Use in Tissue Engineering. ACTA ACUST UNITED AC 2006. [DOI: 10.1089/ten.2006.12.ft-133] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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12
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Schmeichel KL, Bissell MJ. Modeling tissue-specific signaling and organ function in three dimensions. J Cell Sci 2003; 116:2377-88. [PMID: 12766184 PMCID: PMC2933213 DOI: 10.1242/jcs.00503] [Citation(s) in RCA: 460] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
In order to translate the findings from basic cellular research into clinical applications, cell-based models need to recapitulate both the 3D organization and multicellular complexity of an organ but at the same time accommodate systematic experimental intervention. Here we describe a hierarchy of tractable 3D models that range in complexity from organotypic 3D cultures (both monotypic and multicellular) to animal-based recombinations in vivo. Implementation of these physiologically relevant models, illustrated here in the context of human epithelial tissues, has enabled the study of intrinsic cell regulation pathways and also has provided compelling evidence for the role of the stromal compartment in directing epithelial cell function and dysfunction. Furthermore the experimental accessibility afforded by these tissue-specific 3D models has implications for the design and development of cancer therapies.
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Affiliation(s)
- Karen L Schmeichel
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 83-101, CA 94720, USA.
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Cardoza V, Stewart CN. Increased Agrobacterium-mediated transformation and rooting efficiencies in canola (Brassica napus L.) from hypocotyl segment explants. PLANT CELL REPORTS 2003; 21:599-604. [PMID: 12789436 DOI: 10.1007/s00299-002-0560-y] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2002] [Revised: 10/29/2002] [Accepted: 10/30/2002] [Indexed: 05/24/2023]
Abstract
An efficient protocol for the production of transgenic Brassica napus cv. Westar plants was developed by optimizing two important parameters: preconditioning time and co-cultivation time. Agrobacterium tumefaciens-mediated transformation was performed using hypocotyls as explant tissue. Two variants of a green fluorescent protein (GFP)-encoding gene--mGFP5-ER and eGFP--both under the constitutive expression of the cauliflower mosaic virus 35S promoter, were used for the experiments. Optimizing the preconditioning time to 72 h and co-cultivation time with Agrobacterium to 48 h provided the increase in the transformation efficiency from a baseline of 4% to 25%. With mGFP5-ER, the transformation rate was 17% and with eGFP it was 25%. Transgenic shoots were selected on 200 mg/l kanamycin. Rooting efficiency was 100% on half-strength Murashige and Skoog medium with 10 g/l sucrose and 0.5 mg/l indole butyric acid in the presence of kanamycin.
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Affiliation(s)
- V Cardoza
- Department of Plant Sciences and Landscape Systems, University of Tennessee, Rm 252 Ellington Plant Sciences, 2431 Center Drive, Knoxville, TN 37996-4561, USA
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Rice WR, Conkright JJ, Na CL, Ikegami M, Shannon JM, Weaver TE. Maintenance of the mouse type II cell phenotype in vitro. Am J Physiol Lung Cell Mol Physiol 2002; 283:L256-64. [PMID: 12114186 DOI: 10.1152/ajplung.00302.2001] [Citation(s) in RCA: 136] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The purpose of this study was to identify culture conditions for maintenance of isolated mouse type II cells with intact surfactant protein (SP) and phospholipid production. Type II cells were isolated from 6-wk-old mice and cultured on Matrigel matrix-rat tail collagen (70:30 vol/vol) in bronchial epithelial cell growth medium minus hydrocortisone plus 5% charcoal-stripped FBS and 10 ng/ml keratinocyte growth factor. Under these conditions, type II cells actively produced surfactant phospholipids and proteins for at least 7 days. Synthesis and secretion of surfactant phospholipids and SP-A, -B, -C, and -D declined on day 1 of culture but recovered by day 3, reaching levels comparable to or exceeding freshly isolated cells by day 5. Abundant lamellar bodies were readily apparent in cells examined on days 5 and 7, and a surfactant pellet was recovered by centrifugation of media harvested on each day of culture. Secretion of SP-B, SP-C, and phosphatidylcholine was stimulated by phorbol 12-myristate 13-acetate and was inhibited by compound 48/80. When tested with a bubble surfactometer, surfactant secreted by type II cells on day 5 of culture lowered surface tension to 5.2 +/- 2.3 mN/m. This is the first description of the synthesis and secretion of a functional surfactant complex by mouse type II cells after 7 days in primary culture.
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Affiliation(s)
- Ward R Rice
- Division of Pulmonary Biology, Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA.
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