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Bardill JR, Laughter MR, Anderson JB, Hoffman H, Gilani A, Koster MI, Marwan AI. Immunohistochemical and Histopathological Characterization of Spina Bifida Defect Tissues Removed After Prenatal and Postnatal Surgical Repair. Fetal Pediatr Pathol 2024:1-9. [PMID: 38634787 DOI: 10.1080/15513815.2024.2326834] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Accepted: 02/28/2024] [Indexed: 04/19/2024]
Abstract
Background: Myelomeningocele or spina bifida is an open neural tube defect that is characterized by protrusion of the meninges and the spinal cord through a deformity in the vertebral arch and spinous process. Myelomeningocele of post-natal tissue is well described; however, pre-natal tissue of this defect has no known previous histologic characterization. We compared the histology of different forms of pre-natal myelomeningocele and post-natal myelomeningocele tissue obtained via prenatal intrauterine and postnatal surgical repairs. Methods: Pre-and post-natal tissues from spina bifida repair surgeries were obtained from lipomyelomeningocele, myeloschisis, and myelomeningocele spina bifida defects. Tissue samples were processed for H&E and immunohistochemical staining (KRT14 and p63) to assess epidermal and dermal development. Results: Prenatal skin near the defect site develops with normal epidermal, dermal, and adnexal structures. Within the grossly cystic specimens, histology shows highly dense fibrous connective tissue with complete absence of a normal epidermal development with a lack of p63 and KRT14 expression. Conclusion: Tissues harvested from prenatal and postnatal spina bifida repair surgeries appear as normal skin near the defect site. However, cystic tissues consist of highly dense fibrous connective tissue with complete absence of normal epidermal development.
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Affiliation(s)
- James R Bardill
- Department of Surgery, Division of Pediatric Surgery, University of CO Denver Anschutz Medical Campus, Aurora, CO, USA
| | - Melissa R Laughter
- University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, CO, USA
| | - Jaclyn B Anderson
- Department of Pathology, School of Medicine, Stanford University, Stanford, CA, USA
| | - Hilary Hoffman
- Department of Surgery, Division of Pediatric Surgery, University of CO Denver Anschutz Medical Campus, Aurora, CO, USA
| | - Ahmed Gilani
- Department of Pathology, University of Colorado Denver Anschutz Medical Campus, Aurora, CO, USA
| | - Maranke I Koster
- Department of Biochemistry and Molecular Biology, Brody School of Medicine, East Carolina University, Greenville, NC, USA
| | - Ahmed I Marwan
- Department of Surgery, Division of Pediatric Surgery, University of MO School of Medicine, Columbia, MO, USA
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Lyttle BD, Vaughn AE, Bardill JR, Apte A, Gallagher LT, Zgheib C, Liechty KW. Effects of microRNAs on angiogenesis in diabetic wounds. Front Med (Lausanne) 2023; 10:1140979. [PMID: 37020673 PMCID: PMC10067680 DOI: 10.3389/fmed.2023.1140979] [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: 01/09/2023] [Accepted: 02/27/2023] [Indexed: 04/07/2023] Open
Abstract
Diabetes mellitus is a morbid condition affecting a growing number of the world population, and approximately one third of diabetic patients are afflicted with diabetic foot ulcers (DFU), which are chronic non-healing wounds that frequently progress to require amputation. The treatments currently used for DFU focus on reducing pressure on the wound, staving off infection, and maintaining a moist environment, but the impaired wound healing that occurs in diabetes is a constant obstacle that must be faced. Aberrant angiogenesis is a major contributor to poor wound healing in diabetes and surgical intervention is often necessary to establish peripheral blood flow necessary for healing wounds. Over recent years, microRNAs (miRNAs) have been implicated in the dysregulation of angiogenesis in multiple pathologies including diabetes. This review explores the pathways of angiogenesis that become dysregulated in diabetes, focusing on miRNAs that have been identified and the mechanisms by which they affect angiogenesis.
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Affiliation(s)
- Bailey D. Lyttle
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, School of Medicine, University of Colorado Denver—Anschutz Medical Campus, Aurora, CO, United States
- *Correspondence: Bailey D. Lyttle,
| | - Alyssa E. Vaughn
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, School of Medicine, University of Colorado Denver—Anschutz Medical Campus, Aurora, CO, United States
| | - James R. Bardill
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, School of Medicine, University of Colorado Denver—Anschutz Medical Campus, Aurora, CO, United States
| | - Anisha Apte
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, College of Medicine, University of Arizona Health Sciences College of Medicine—Tucson, Tucson, AZ, United States
| | - Lauren T. Gallagher
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, School of Medicine, University of Colorado Denver—Anschutz Medical Campus, Aurora, CO, United States
| | - Carlos Zgheib
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, College of Medicine, University of Arizona Health Sciences College of Medicine—Tucson, Tucson, AZ, United States
| | - Kenneth W. Liechty
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, College of Medicine, University of Arizona Health Sciences College of Medicine—Tucson, Tucson, AZ, United States
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Bardill JR, Laughter MR, Stager M, Liechty KW, Krebs MD, Zgheib C. Topical gel-based biomaterials for the treatment of diabetic foot ulcers. Acta Biomater 2022; 138:73-91. [PMID: 34728428 PMCID: PMC8738150 DOI: 10.1016/j.actbio.2021.10.045] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/18/2021] [Accepted: 10/25/2021] [Indexed: 01/17/2023]
Abstract
Diabetic foot ulcers (DFUs) are a devastating ailment for many diabetic patients with increasing prevalence and morbidity. The complex pathophysiology of DFU wound environments has made finding effective treatments difficult. Standard wound care treatments have limited efficacy in healing these types of chronic wounds. Topical biomaterial gels have been developed to implement novel treatment approaches to improve therapeutic effects and are advantageous due to their ease of application, tunability, and ability to improve therapeutic release characteristics. Here, we provide an updated, comprehensive review of novel topical biomaterial gels developed for treating chronic DFUs. This review will examine preclinical data for topical gel treatments in diabetic animal models and clinical applications, focusing on gels with protein/peptides, drug, cellular, herbal/antioxidant, and nano/microparticle approaches. STATEMENT OF SIGNIFICANCE: By 2050, 1 in 3 Americans will develop diabetes, and up to 34% of diabetic patients will develop a diabetic foot ulcer (DFU) in their lifetime. Current treatments for DFUs include debridement, infection control, maintaining a moist wound environment, and pressure offloading. Despite these interventions, a large number of DFUs fail to heal and are associated with a cost that exceeds $31 billion annually. Topical biomaterials have been developed to help target specific impairments associated with DFU with the goal to improve healing. A summary of these approaches is needed to help better understand the current state of the research. This review summarizes recent research and advances in topical biomaterials treatments for DFUs.
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Affiliation(s)
- James R Bardill
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, University of Colorado Denver School of Medicine and Children's Hospital Colorado, Aurora, CO, USA
| | | | - Michael Stager
- Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, CO, USA
| | - Kenneth W Liechty
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, University of Colorado Denver School of Medicine and Children's Hospital Colorado, Aurora, CO, USA
| | - Melissa D Krebs
- Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, CO, USA
| | - Carlos Zgheib
- Laboratory for Fetal and Regenerative Biology, Department of Surgery, University of Colorado Denver School of Medicine and Children's Hospital Colorado, Aurora, CO, USA.
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Bardill JR, Williams SM, Laughter MR, Park D, Marwan AI. Evaluation of scaffolding, inflammatory response, and wound healing support of a reverse thermal gel for myelomeningocele patching. J Appl Polym Sci 2021. [DOI: 10.1002/app.50013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- James R. Bardill
- Department of Bioengineering University of Colorado Denver Anschutz Medical Campus Aurora Colorado USA
- Division of Pediatric Surgery, Department of Surgery University of Colorado Denver Anschutz Medical Campus Aurora Colorado USA
| | - Sarah M. Williams
- Division of Pediatric Surgery, Department of Surgery University of Colorado Denver Anschutz Medical Campus Aurora Colorado USA
| | - Melissa R. Laughter
- Department of Bioengineering University of Colorado Denver Anschutz Medical Campus Aurora Colorado USA
| | - Daewon Park
- Department of Bioengineering University of Colorado Denver Anschutz Medical Campus Aurora Colorado USA
| | - Ahmed I. Marwan
- Department of Surgery University of Colorado, Anschutz medical campus Aurora Colorado USA
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Laughter M, Anderson JB, Bardill JR, Marwan R, Park D. 18892 Biomimetic scaffold for efficient in vitro skin engineering. J Am Acad Dermatol 2020. [DOI: 10.1016/j.jaad.2020.06.525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bardill JR, Park D, Marwan AI. Improved Coverage of Mouse Myelomeningocele With a Mussel Inspired Reverse Thermal Gel. J Surg Res 2020; 251:262-274. [PMID: 32197182 DOI: 10.1016/j.jss.2020.01.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 09/09/2019] [Revised: 01/09/2020] [Accepted: 01/31/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND Myelomeningocele (MMC) is an open neural tube defect of the spinal column. Our laboratory previously introduced a reverse thermal gel (RTG) as the first in situ forming patch for in utero MMC application. To overcome the challenges of anchoring the RTG in the wet amniotic environment to improve MMC coverage, we modified the RTG to mimic the underwater adhesive properties of mussels. We have separated this study into three separate hypotheses-based components: CONCLUSIONS: The DRTG demonstrates increased elasticity, cellular scaffolding properties, and improved MMC coverage in the Grhl3 mouse model. Future studies will be translated to the preclinical ovine model to evaluate this novel gel.
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Affiliation(s)
- James R Bardill
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado; Division of Pediatric Surgery, Department of Surgery, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado
| | - Daewon Park
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado.
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Lee DJ, Rocker AJ, Bardill JR, Shandas R, Park D. A sulfonated reversible thermal gel for the spatiotemporal control of VEGF delivery to promote therapeutic angiogenesis. J Biomed Mater Res A 2018; 106:3053-3064. [PMID: 30295997 DOI: 10.1002/jbm.a.36496] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [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: 03/16/2018] [Revised: 06/15/2018] [Accepted: 06/22/2018] [Indexed: 12/23/2022]
Abstract
Despite medical and surgical advancements for the treatment of cardiovascular disease, mortality and morbidity remain high. Therapeutic angiogenesis has been one approach to address the major clinical need for a more effective treatment to restoring blood flow in ischemic organs and tissues, but current progress in angiogenic drug delivery is inadequate at providing sufficient bioavailability without causing safety concerns. An injectable sulfonated reversible thermal gel composed of a polyurea conjugated with poly(N-isopropylacrylamide) and sulfonate groups has been developed for the delivery of angiogenic factors. The thermal gel allowed for the spatiotemporal control of vascular endothelial growth factor release with a decreased initial burst release and reduced release rate in vitro. A subcutaneous injection mouse model was used to evaluate efficacious vascularization and assess the inflammatory response due to a foreign body. Thermal gel injections showed substantial vascularization properties by inducing vessel formation, recruitment and differentiation of vascular endothelial cells, and vessel stabilization by perivascular cells, while infiltrating macrophages due to the thermal gel injections decreased over time. These results demonstrated effective localization and delivery of angiogenic factors for therapeutic angiogenesis. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 3053-3064, 2018.
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Affiliation(s)
- David J Lee
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, 12800 E. 19th Avenue, Aurora, Colorado, 80045
| | - Adam J Rocker
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, 12800 E. 19th Avenue, Aurora, Colorado, 80045
| | - James R Bardill
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, 12800 E. 19th Avenue, Aurora, Colorado, 80045
| | - Robin Shandas
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, 12800 E. 19th Avenue, Aurora, Colorado, 80045
| | - Daewon Park
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, 12800 E. 19th Avenue, Aurora, Colorado, 80045
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Laughter MR, Bardill JR, Ammar DA, Pena B, Calkins DJ, Park D. Injectable Neurotrophic Factor Delivery System Supporting Retinal Ganglion Cell Survival and Regeneration Following Optic Nerve Crush. ACS Biomater Sci Eng 2018; 4:3374-3383. [PMID: 31431919 DOI: 10.1021/acsbiomaterials.8b00803] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In general, neurons belonging to the central nervous system (CNS), such as retinal ganglion cells (RGCs), do not regenerate. Due to this, strategies have emerged aimed at protecting and regenerating these cells. Neurotrophic factor (NTF) supplementation has been a promising approach but is limited by length of delivery and delivery vehicle. For this study, we tested a polymeric delivery system (sulfonated reverse thermal gel or SRTG) engineered to deliver cilliary neurotrophic factor (CNTF), while also being injectable. A rat optic nerve crush (ONC) model was used to determine the neuroprotective and regenerative capacity of our system. The results demonstrate that one single intravitreal injection of SRTG-CNTF following ONC showed significant protection of RGC survival at both 1 and 2 week time points, when compared to the control groups. Furthermore, there was no significant difference in the RGC count between the eyes that received the SRTG-CNTF following ONC and a healthy control eye. Intravitreal injection of the polymer system also induced noticeable axon regeneration 500 μm downstream from the lesion site compared to all other control groups. There was a significant increase in Müller cell response in groups that received the SRTG-CNTF injection following optic nerve crush also indicative of a regenerative response. Finally, higher concentrations of CNTF released from SRTG-CNTF showed a protective effect on RGCs and Müller cell response at a longer time point (4 weeks). In conclusion, we were able to show a neuroprotective and regenerative effect of this polymer SRTG-CNTF delivery system and the viability for treatment of neurodegenerations.
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Affiliation(s)
- Melissa R Laughter
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - James R Bardill
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - David A Ammar
- Department of Ophthalmology, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - Brisa Pena
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - David J Calkins
- Department of Ophthalmology and Visual Sciences, Vanderbilt University Medical Center, Nashville, Tennessee 37232, United States
| | - Daewon Park
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
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Marwan AI, Williams SM, Bardill JR, Gralla J, Abdul-Aziz NM, Park D. Reverse Thermal Gel for In Utero Coverage of Spina Bifida Defects: An Innovative Bioengineering Alternative to Open Fetal Repair. Macromol Biosci 2017; 17. [DOI: 10.1002/mabi.201600473] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 12/17/2016] [Indexed: 12/22/2022]
Affiliation(s)
- Ahmed I. Marwan
- Laboratory for Fetal and Regenerative Biology; Department of Surgery; University of Colorado; School of Medicine; Anschutz Medical Campus; 12700 E 19th Ave., RC2-P15-6013 Aurora 80045 USA
| | - Sarah M. Williams
- Laboratory for Fetal and Regenerative Biology; Department of Surgery; University of Colorado; School of Medicine; Anschutz Medical Campus; 12700 E 19th Ave., RC2-P15-6013 Aurora 80045 USA
| | - James R. Bardill
- Department of Bioengineering; University of Colorado; School of Medicine; Anschutz Medical Campus; 12700 E 19th Ave., RC2-P15-6013 Aurora 80045 USA
| | - Jane Gralla
- Department of Pediatrics; University of Colorado; School of Medicine; Anschutz Medical Campus; 12700 E 19th Ave., RC2-P15-6013 Aurora 80045 USA
| | - Noraishah M. Abdul-Aziz
- Laboratory for Fetal and Regenerative Biology; Department of Surgery; University of Colorado; School of Medicine; Anschutz Medical Campus; 12700 E 19th Ave., RC2-P15-6013 Aurora 80045 USA
| | - Daewon Park
- Department of Bioengineering; University of Colorado; School of Medicine; Anschutz Medical Campus; 12700 E 19th Ave., RC2-P15-6013 Aurora 80045 USA
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Laughter MR, Ammar DA, Bardill JR, Pena B, Kahook MY, Lee DJ, Park D. A Self-Assembling Injectable Biomimetic Microenvironment Encourages Retinal Ganglion Cell Axon Extension in Vitro. ACS Appl Mater Interfaces 2016; 8:20540-8. [PMID: 27434231 PMCID: PMC5752433 DOI: 10.1021/acsami.6b04679] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Sensory-somatic nervous system neurons, such as retinal ganglion cells (RGCs), are typically thought to be incapable of regenerating. However, it is now known that these cells may be stimulated to regenerate by providing them with a growth permissive environment. We have engineered an injectable microenvironment designed to provide growth-stimulating cues for RGC culture. Upon gelation, this injectable material not only self-assembles into laminar sheets, similar to retinal organization, but also possesses a storage modulus comparable to that of retinal tissue. Primary rat RGCs were grown, stained, and imaged in this three-dimensional scaffold. We were able to show that RGCs grown in this retina-like structure exhibited characteristic long, prominent axons. In addition, RGCs showed a consistent increase in average axon length and neurite-bearing ratio over the 7 day culture period, indicating this scaffold is capable of supporting substantial RGC axon extension.
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Affiliation(s)
- Melissa R. Laughter
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - David A. Ammar
- Department of Ophthalmology, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - James R. Bardill
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - Brisa Pena
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - Malik Y. Kahook
- Department of Ophthalmology, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - David J. Lee
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - Daewon Park
- Department of Bioengineering, University of Colorado Denver Anschutz Medical Campus, Aurora, Colorado 80045, United States
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