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  1. Article ; Online: Response to: Vitamin E Improves Volumetry and Regenerative Effects of Fat Grafting.

    Abbas, Darren B / Wan, Derrick C

    Aesthetic surgery journal

    2022  Volume 42, Issue 8, Page(s) NP567–NP568

    MeSH term(s) Adipose Tissue/transplantation ; Humans ; Rejuvenation ; Vitamin E/pharmacology ; Vitamin E/therapeutic use
    Chemical Substances Vitamin E (1406-18-4)
    Language English
    Publishing date 2022-04-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 2087022-X
    ISSN 1527-330X ; 1090-820X ; 1084-0761
    ISSN (online) 1527-330X
    ISSN 1090-820X ; 1084-0761
    DOI 10.1093/asj/sjac102
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Deferoxamine topical cream superior to patch in rescuing radiation-induced fibrosis of unwounded and wounded skin.

    Berry, Charlotte E / Abbas, Darren B / Griffin, Michelle / Lintel, Hendrik / Guo, Jason / Kameni, Lionel / Churukian, Andrew A / Fazilat, Alexander Z / Chen, Kellen / Gurtner, Geoffrey C / Longaker, Michael T / Momeni, Arash / Wan, Derrick C

    Journal of cellular and molecular medicine

    2024  Volume 28, Issue 8, Page(s) e18306

    Abstract: Topical patch delivery of deferoxamine (DFO) has been studied as a treatment for this fibrotic transformation in irradiated tissue. Efficacy of a novel cream formulation of DFO was studied as a RIF therapeutic in unwounded and excisionally wounded ... ...

    Abstract Topical patch delivery of deferoxamine (DFO) has been studied as a treatment for this fibrotic transformation in irradiated tissue. Efficacy of a novel cream formulation of DFO was studied as a RIF therapeutic in unwounded and excisionally wounded irradiated skin. C57BL/6J mice underwent 30 Gy of radiation to the dorsum followed by 4 weeks of recovery. In a first experiment, mice were separated into six conditions: DFO 50 mg cream (D50), DFO 100 mg cream (D100), soluble DFO injections (DI), DFO 1 mg patch (DP), control cream (Vehicle), and irradiated untreated skin (IR). In a second experiment, excisional wounds were created on the irradiated dorsum of mice and then divided into four treatment groups: DFO 100 mg Cream (W-D100), DFO 1 mg patch (W-DP), control cream (W-Vehicle), and irradiated untreated wounds (W-IR). Laser Doppler perfusion scans, biomechanical testing, and histological analysis were performed. In irradiated skin, D100 improved perfusion compared to D50 or DP. Both D100 and DP enhanced dermal characteristics, including thickness, collagen density and 8-isoprostane staining compared to untreated irradiated skin. D100 outperformed DP in CD31 staining, indicating higher vascular density. Extracellular matrix features of D100 and DP resembled normal skin more closely than DI or control. In radiated excisional wounds, D100 facilitated faster wound healing and increased perfusion compared to DP. The 100 mg DFO cream formulation rescued RIF of unwounded irradiated skin and improved excisional wound healing in murine skin relative to patch delivery of DFO.
    MeSH term(s) Mice ; Animals ; Mice, Inbred C57BL ; Radiation Fibrosis Syndrome ; Deferoxamine/pharmacology ; Deferoxamine/therapeutic use ; Skin ; Perfusion
    Chemical Substances Deferoxamine (J06Y7MXW4D)
    Language English
    Publishing date 2024-04-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 2074559-X
    ISSN 1582-4934 ; 1582-4934 ; 1582-1838
    ISSN (online) 1582-4934
    ISSN 1582-4934 ; 1582-1838
    DOI 10.1111/jcmm.18306
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Quality Assessment of Online Resources for Gender-affirming Surgery.

    Berry, Charlotte E / Fazilat, Alexander Z / Churukian, Andrew A / Abbas, Darren B / Griffin, Michelle / Downer, Mauricio / Januszyk, Micheal / Momeni, Arash / Morrison, Shane D / Wan, Derrick C

    Plastic and reconstructive surgery. Global open

    2023  Volume 11, Issue 10, Page(s) e5306

    Abstract: Background: As visibility of the transgender patient population and utilization of online resources increases, it is imperative that web-based gender-affirming surgery (GAS) materials for patients are readable, accessible, and of high quality.: ... ...

    Abstract Background: As visibility of the transgender patient population and utilization of online resources increases, it is imperative that web-based gender-affirming surgery (GAS) materials for patients are readable, accessible, and of high quality.
    Methods: A search trends analysis was performed to determine frequency of GAS-related searches over time. The top 100 most common results for GAS-related terms were analyzed using six readability formulas. Accessibility of patient-facing GAS sources was determined by categorizing types of search results. Frequency of article types was compared in low- and high-population dense areas. Quality was assigned to GAS web-based sources using the DISCERN score.
    Results: Search engine trend data demonstrates increasing occurrence of searches related to GAS. Readability scores of the top 100 online sources for GAS were discovered to exceed recommended levels for patient proficiency. Availability of patient-facing online information related to GAS was found to be 60%, followed by information provided by insurance companies (17%). Differences in availability of online resources in varying dense cities were found to be minimal. The average quality of sources determined by the DISCERN score was found to be 3, indicating "potential important shortcomings."
    Conclusions: Despite increasing demand for web-based GAS information, the readability of online resources related to GAS was found to be significantly greater than the grade level of proficiency recommended for patients. A high number of nonpatient-facing search results appear in response to GAS search terms. Quality sources are still difficult for patients to find, as search results have a high incidence of low-quality resources.
    Language English
    Publishing date 2023-10-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2851682-5
    ISSN 2169-7574 ; 2169-7574
    ISSN (online) 2169-7574
    ISSN 2169-7574
    DOI 10.1097/GOX.0000000000005306
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Establishing a Xenograft Model with CD-1 Nude Mice to Study Human Skin Wound Repair.

    Abbas, Darren B / Griffin, Michelle / Fahy, Evan J / Spielman, Amanda F / Guardino, Nicholas J / Pu, Adrian / Lintel, Hendrik / Lorenz, H Peter / Longaker, Michael T / Wan, Derrick C

    Plastic and reconstructive surgery

    2023  Volume 153, Issue 1, Page(s) 121–128

    Abstract: Background: A significant gap exists in the translatability of small-animal models to human subjects. One important factor is poor laboratory models involving human tissue. Thus, the authors have created a viable postnatal human skin xenograft model ... ...

    Abstract Background: A significant gap exists in the translatability of small-animal models to human subjects. One important factor is poor laboratory models involving human tissue. Thus, the authors have created a viable postnatal human skin xenograft model using athymic mice.
    Methods: Discarded human foreskins were collected following circumcision. All subcutaneous tissue was removed from these samples sterilely. Host CD-1 nude mice were then anesthetized, and dorsal skin was sterilized. A 1.2-cm-diameter, full-thickness section of dorsal skin was excised. The foreskin sample was then placed into the full-thickness defect in the host mice and sutured into place. Xenografts underwent dermal wounding using a 4-mm punch biopsy after engraftment. Xenografts were monitored for 14 days after wounding and then harvested.
    Results: At 14 days postoperatively, all mice survived the procedure. Grossly, the xenograft wounds showed formation of a human scar at postoperative day 14. Hematoxylin and eosin and Masson trichome staining confirmed scar formation in the wounded human skin. Using a novel artificial intelligence algorithm using picrosirius red staining, scar formation was confirmed in human wounded skin compared with the unwounded skin. Histologically, CD31 + immunostaining confirmed vascularization of the xenograft. The xenograft exclusively showed human collagen type I, CD26 + , and human nuclear antigen in the human scar without any staining of these human markers in the murine skin.
    Conclusion: The proposed model demonstrates wound healing to be a local response from tissue resident human fibroblasts and allows for reproducible evaluation of human skin wound repair in a preclinical model.
    Clinical relevance statement: Radiation-induced fibrosis is a widely prevalent clinical phenomenon without a well-defined treatment at this time. This study will help establish a small-animal model to better understand and develop novel therapeutics to treat irradiated human skin.
    MeSH term(s) Animals ; Humans ; Male ; Mice ; Artificial Intelligence ; Cicatrix/pathology ; Disease Models, Animal ; Heterografts ; Mice, Nude ; Skin/pathology ; Wound Healing/physiology
    Language English
    Publishing date 2023-03-27
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 208012-6
    ISSN 1529-4242 ; 0032-1052 ; 0096-8501
    ISSN (online) 1529-4242
    ISSN 0032-1052 ; 0096-8501
    DOI 10.1097/PRS.0000000000010465
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Transdermal deferoxamine administration improves excisional wound healing in chronically irradiated murine skin.

    Lintel, Hendrik / Abbas, Darren B / Lavin, Christopher V / Griffin, Michelle / Guo, Jason L / Guardino, Nicholas / Churukian, Andrew / Gurtner, Geoffrey C / Momeni, Arash / Longaker, Michael T / Wan, Derrick C

    Journal of translational medicine

    2022  Volume 20, Issue 1, Page(s) 274

    Abstract: Background: Radiation-induced skin injury is a well-known risk factor for impaired wound healing. Over time, the deleterious effects of radiation on skin produce a fibrotic, hypovascular dermis poorly suited to wound healing. Despite increasing ... ...

    Abstract Background: Radiation-induced skin injury is a well-known risk factor for impaired wound healing. Over time, the deleterious effects of radiation on skin produce a fibrotic, hypovascular dermis poorly suited to wound healing. Despite increasing understanding of the underlying pathophysiology, therapeutic options remain elusive. Deferoxamine (DFO), an iron-chelating drug, has been shown in prior murine studies to ameliorate radiation-induced skin injury as well as improve wound healing outcomes in various pathologic conditions when administered transdermally. In this preclinical study, we evaluated the effects of deferoxamine on wound healing outcomes in chronically irradiated murine skin.
    Methods: Wild-type mice received 30 Gy of irradiation to their dorsal skin and were left to develop chronic fibrosis. Stented excisional wounds were created on their dorsal skin. Wound healing outcomes were compared across 4 experimental conditions: DFO patch treatment, vehicle-only patch treatment, untreated irradiated wound, and untreated nonirradiated wounds. Gross closure rate, wound perfusion, scar elasticity, histology, and nitric oxide assays were compared across the conditions.
    Results: Relative to vehicle and untreated irradiated wounds, DFO accelerated wound closure and reduced the frequency of healing failure in irradiated wounds. DFO augmented wound perfusion throughout healing and upregulated angiogenesis to levels observed in nonirradiated wounds. Histology revealed DFO increased wound thickness, collagen density, and improved collagen fiber organization to more closely resemble nonirradiated wounds, likely contributing to the observed improved scar elasticity. Lastly, DFO upregulated inducible nitric oxide synthase and increased nitric oxide production in early healing wounds.
    Conclusion: Deferoxamine treatment presents a potential therapeutic avenue through which to target impaired wound healing in patients following radiotherapy.
    MeSH term(s) Animals ; Cicatrix/pathology ; Collagen/pharmacology ; Deferoxamine/pharmacology ; Deferoxamine/therapeutic use ; Humans ; Mice ; Nitric Oxide ; Radiation Injuries ; Skin/pathology ; Wound Healing
    Chemical Substances Nitric Oxide (31C4KY9ESH) ; Collagen (9007-34-5) ; Deferoxamine (J06Y7MXW4D)
    Language English
    Publishing date 2022-06-17
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2118570-0
    ISSN 1479-5876 ; 1479-5876
    ISSN (online) 1479-5876
    ISSN 1479-5876
    DOI 10.1186/s12967-022-03479-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Tension offloading improves cutaneous scar formation in Achilles tendon repair.

    Abbas, Darren B / Lintel, Hendrik / Griffin, Michelle / Guardino, Nicholas J / Guo, Jason L / Spielman, Amanda F / Cotterell, Asha C / Parker, Jennifer B L / Januszyk, Michael / Wan, Derrick C

    Journal of surgical case reports

    2022  Volume 2022, Issue 3, Page(s) rjac066

    Abstract: Hypertrophic scar formation and non-healing wounds following Achilles tendon repair arise from poor vascularity to the incisional site or from excess mechanical stress/strain to the incision during the healing process. The embrace® scar therapy dressing ... ...

    Abstract Hypertrophic scar formation and non-healing wounds following Achilles tendon repair arise from poor vascularity to the incisional site or from excess mechanical stress/strain to the incision during the healing process. The embrace® scar therapy dressing is a tension offloading device for incisional scars. This study explored the effects of tension offloading during Achilles scar formation. A healthy 30-year-old male without any medical co-morbidities developed an acute rupture of his left Achilles tendon. The patient underwent open repair 1 week after injury. At post-operative day (POD) 14, the patient started daily tension offloading treatment on the inferior portion of the incision through POD 120. By POD 120, the untreated portion of the Achilles incision appeared hypertrophic and hyperpigmented, while the treated portion of the scar appeared flat with minimal pigmentation changes. The 12-week treatment of tension offloading on an Achilles tendon repair incision significantly improved cosmesis compared to untreated incision.
    Language English
    Publishing date 2022-03-09
    Publishing country England
    Document type Case Reports
    ZDB-ID 2580919-2
    ISSN 2042-8812
    ISSN 2042-8812
    DOI 10.1093/jscr/rjac066
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Adipose-Derived Stromal Cell-Based Therapies for Radiation-Induced Fibrosis.

    Berry, Charlotte E / Abbas, Darren B / Lintel, Hendrik A / Churukian, Andrew A / Griffin, Michelle / Guo, Jason L / Cotterell, Asha C / Parker, Jennifer B Laufey / Downer, Mauricio A / Longaker, Michael T / Wan, Derrick C

    Advances in wound care

    2022  

    Abstract: Significance: ...

    Abstract Significance:
    Language English
    Publishing date 2022-12-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2650541-1
    ISSN 2162-1934 ; 2162-1918
    ISSN (online) 2162-1934
    ISSN 2162-1918
    DOI 10.1089/wound.2022.0103
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  8. Article ; Online: Fat Grafts Augmented With Vitamin E Improve Volume Retention and Radiation-Induced Fibrosis.

    Abbas, Darren B / Lavin, Christopher V / Fahy, Evan J / Griffin, Michelle / Guardino, Nicholas J / Nazerali, Rahim S / Nguyen, Dung H / Momeni, Arash / Longaker, Michael T / Wan, Derrick C

    Aesthetic surgery journal

    2022  Volume 42, Issue 8, Page(s) 946–955

    Abstract: Background: Treatments for radiation-induced fibrosis range from vitamin E (VE) and pentoxifylline (PTX) systemically to deferoxamine and fat grafting locally. Regarding fat grafting, volume retention hinders its long-term functionality and is affected ... ...

    Abstract Background: Treatments for radiation-induced fibrosis range from vitamin E (VE) and pentoxifylline (PTX) systemically to deferoxamine and fat grafting locally. Regarding fat grafting, volume retention hinders its long-term functionality and is affected by 2 factors: inflammation and necrosis secondary to hypovascularity.
    Objective: The authors aimed to simultaneously improve fat graft retention and radiation-induced fibrosis by integrating VE and PTX into fat grafts locally.
    Methods: Forty adult CD-1 nude male mice, 6 weeks old, underwent scalp irradiation and recovered for 4 weeks to allow for development of fibrosis. Mice received 200 μL of donor human fat graft to the scalp. Mice were separated into 4 conditions: no grafting, fat graft without treatment, graft treated with PTX, and graft treated with VE. Fat graft volume retention was monitored in vivo with micro-computed tomography scans at weeks 0, 1, 2, 4, 6, and 8 after grafting. Histological and cytokine analysis of the scalp skin and fat grafts were performed.
    Results: VE-treated grafts had significant improvement in dermal thickness and collagen density of overlying skin compared with all other groups. VE decreased 8-isoprostane and increased CD31+ staining compared with the other grafted groups. Cytokine analysis revealed decreased inflammatory and increased angiogenic markers in both the fat graft and overlying skin of the VE group. Fat graft volume retention was significantly improved in the VE group starting at 1 week post grafting.
    Conclusions: Radiation-induced fibrosis and fat graft volume retention are both simultaneously improved with local administration of VE.
    MeSH term(s) Adipose Tissue/transplantation ; Animals ; Cytokines ; Graft Survival ; Humans ; Male ; Mice ; Mice, Nude ; Radiation Fibrosis Syndrome ; Vitamin E/pharmacology ; Vitamin E/therapeutic use ; X-Ray Microtomography
    Chemical Substances Cytokines ; Vitamin E (1406-18-4)
    Language English
    Publishing date 2022-03-29
    Publishing country England
    Document type Journal Article
    ZDB-ID 2087022-X
    ISSN 1527-330X ; 1090-820X ; 1084-0761
    ISSN (online) 1527-330X
    ISSN 1090-820X ; 1084-0761
    DOI 10.1093/asj/sjac066
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Topical vanadate improves tensile strength and alters collagen organisation of excisional wounds in a mouse model.

    Lintel, Hendrik / Abbas, Darren B / Mackay, Duncan J / Griffin, Michelle / Lavin, Christopher V / Berry, Charlotte E / Guardino, Nicholas J / Guo, Jason L / Momeni, Arash / Mackay, Donald R / Longaker, Michael T / Wan, Derrick C

    Wound repair and regeneration : official publication of the Wound Healing Society [and] the European Tissue Repair Society

    2022  Volume 31, Issue 1, Page(s) 77–86

    Abstract: Wound dehiscence, oftentimes a result of the poor tensile strength of early healing wounds, is a significant threat to the post-operative patient, potentially causing life-threatening complications. Vanadate, a protein tyrosine phosphatase inhibitor, has ...

    Abstract Wound dehiscence, oftentimes a result of the poor tensile strength of early healing wounds, is a significant threat to the post-operative patient, potentially causing life-threatening complications. Vanadate, a protein tyrosine phosphatase inhibitor, has been shown to alter the organisation of deposited collagen in healing wounds and significantly improve the tensile strength of incisional wounds in rats. In this study, we sought to explore the effects of locally administered vanadate on tensile strength and collagen organisation in both the early and remodelling phases of excisional wound healing in a murine model. Wild-type mice underwent stented excisional wounding on their dorsal skin and were divided equally into three treatment conditions: vanadate injection, saline injection control and an untreated control. Tensile strength testing, in vivo suction Cutometer analysis, gross wound measurements and histologic analysis were performed during healing, immediately upon wound closure, and after 4 weeks of remodelling. We found that vanadate treatment significantly increased the tensile strength of wounds and their stiffness relative to control wounds, both immediately upon healing and into the remodelling phase. Histologic analysis revealed that these biomechanical changes were likely the result of increased collagen deposition and an altered collagen organisation composed of thicker and distinctly organised collagen bundles. Given the risk that dehiscence poses to all operative patients, vanadate presents an interesting therapeutic avenue to improve the strength of post-operative wounds and unstable chronic wounds to reduce the risk of dehiscence.
    MeSH term(s) Rats ; Mice ; Animals ; Wound Healing ; Vanadates/pharmacology ; Vanadates/metabolism ; Vanadates/therapeutic use ; Disease Models, Animal ; Tensile Strength ; Collagen/metabolism ; Skin/injuries ; Surgical Wound/metabolism
    Chemical Substances Vanadates (3WHH0066W5) ; Collagen (9007-34-5)
    Language English
    Publishing date 2022-12-14
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1174873-4
    ISSN 1524-475X ; 1067-1927
    ISSN (online) 1524-475X
    ISSN 1067-1927
    DOI 10.1111/wrr.13062
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Decellularized Adipose Matrices Can Alleviate Radiation-Induced Skin Fibrosis.

    Adem, Sandeep / Abbas, Darren B / Lavin, Christopher V / Fahy, Evan J / Griffin, Michelle / Diaz Deleon, Nestor M / Borrelli, Mimi R / Mascharak, Shamik / Shen, Abra H / Patel, Ronak A / Longaker, Michael T / Nazerali, Rahim S / Wan, Derrick C

    Advances in wound care

    2021  Volume 11, Issue 10, Page(s) 524–536

    Abstract: Objective: ...

    Abstract Objective:
    MeSH term(s) Adipose Tissue ; Animals ; Atrophy/pathology ; Fibrosis ; Humans ; Mice ; Mice, Nude ; Skin/pathology
    Language English
    Publishing date 2021-09-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 2650541-1
    ISSN 2162-1934 ; 2162-1918
    ISSN (online) 2162-1934
    ISSN 2162-1918
    DOI 10.1089/wound.2021.0008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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