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Gottula AL, Qi M, Lane BH, Shaw CR, Gorder K, Powell E, Danielson K, Ciullo A, Johnson NJ, Tonna JE, Hinckley WR, Koshoffer A, Al-Araji R, Bartos J, Benoit J, Hsu CH. Prehospital Ground and Helicopter-Based Extracorporeal Cardiopulmonary Resuscitation (ECPR) Reduce Barriers to ECPR: A GIS Model. PREHOSP EMERG CARE 2024:1-27. [PMID: 38739864 DOI: 10.1080/10903127.2024.2355652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Accepted: 05/03/2024] [Indexed: 05/16/2024]
Abstract
INTRODUCTION Evidence suggests that Extracorporeal Cardiopulmonary Resuscitation (ECPR) can improve survival rates for nontraumatic out-of-hospital cardiac arrest (OHCA). However, when ECPR is indicated over 50% of potential candidates are unable to qualify in the current hospital-based system due to geographic limitations. This study employs a Geographic Information System (GIS) model to estimate the number of ECPR eligible patients within the United States in the current hospital-based system, a prehospital ECPR ground-based system, and a prehospital ECPR Helicopter Emergency Medical Services (HEMS)-based system. METHODS We constructed a GIS model to estimate ground and helicopter transport times. Time-dependent rates of ECPR eligibility were derived from the Resuscitation Outcome Consortium (ROC) database, while the Cardiac Arrest Registry to Enhance Survival (CARES) registry determined the number of OHCA patients meeting ECPR criteria within designated transportation times. Emergency Medical Services (EMS) response time, ECPR candidacy determination time, and on-scene time were modeled based on data from the EROCA trial. The combined model was used to estimate the total ECPR eligibility in each system. RESULTS The CARES registry recorded 736,066 OHCA patients from 2013 to 2021. After applying clinical criteria, 24,661 (3.4%) ECPR-indicated OHCA were identified. When considering overall ECPR eligibility within 45 minutes from OHCA to initiation, only 11.76% of OHCA where ECPR was indicated were eligible in the current hospital-based system. The prehospital ECPR HEMS-based system exhibited a four-fold increase in ECPR eligibility (49.3%), while the prehospital ground-based system showed a more than two-fold increase (28.4%). CONCLUSIONS The study demonstrates a two-fold increase in ECPR eligibility for a field-deployable ground-based system and a four-fold increase for a prehospital ECPR HEMS-based system compared to the current hospital-based OHCA system. This novel GIS model can inform future ECPR implementation strategies, optimizing systems of care.
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Affiliation(s)
- Adam L Gottula
- Department of Emergency Medicine, University of Michigan
- Department of Anesthesiology, University of Michigan
- Max Harry Weil Institute for Critical Care Research and Innovation
| | - Man Qi
- Department of Geography and Geographic Information System, The University of Cincinnati
| | - Bennett H Lane
- Department of Emergency Medicine, University of Cincinnati
| | - Christopher R Shaw
- Department of Emergency Medicine, Division of Critical Care, Oregon Health and Science University
| | - Kari Gorder
- The Carl and Edyth Lindner Center for Research and Education, The Christ Hospital
| | | | | | - Anna Ciullo
- Department of Emergency Medicine, University of Utah
| | - Nicholas J Johnson
- Department of Emergency Medicine & Division of Pulmonary, Critical Care, and Sleep Medicine, University of Washington
| | | | - William R Hinckley
- Department of Emergency Medicine, University of Cincinnati
- UC Health, Air Care and Mobile Care
| | - Amy Koshoffer
- University of Cincinnati Libraries, The University of Cincinnati
| | | | - Jason Bartos
- Center for Resuscitation Medicine, The University of Minnesota
| | - Justin Benoit
- Department of Emergency Medicine, University of Cincinnati
| | - Cindy H Hsu
- Department of Emergency Medicine, University of Michigan
- Max Harry Weil Institute for Critical Care Research and Innovation
- Department of Surgery, University of Michigan
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2
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Gottula AL, Shaw CR, Gorder KL, Lane BH, Latessa J, Qi M, Koshoffer A, Al-Araji R, Young W, Bonomo J, Langabeer JR, Yannopoulos D, Henry TD, Hsu CH, Benoit JL. Eligibility of out-of-hospital cardiac arrest patients for extracorporeal cardiopulmonary resuscitation in the United States: A geographic information system model. Resuscitation 2022; 180:111-120. [PMID: 36183812 DOI: 10.1016/j.resuscitation.2022.09.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/10/2022] [Accepted: 09/12/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Recent evidence suggest that extracorporeal cardiopulmonary resuscitation (ECPR) may improve survival rates for nontraumatic out-of-hospital cardiac arrest (OHCA). Eligibility criteria for ECPR are often based on patient age, clinical variables, and facility capabilities. Expanding access to ECPR across the U.S. requires a better understanding of how these factors interact with transport time to ECPR centers. METHODS We constructed a Geographic Information System (GIS) model to estimate the number of ECPR candidates in the U.S. We utilized a Resuscitation Outcome Consortium (ROC) database to model time-dependent rates of ECPR eligibility and the Cardiac Arrest Registry to Enhance Survival (CARES) registry to determine the total number of OHCA patients who meet pre-specified ECPR criteria within designated transportation times. The combined model was used to estimate the total number of ECPR candidates. RESULTS There were 588,203 OHCA patients in the CARES registry from 2013 to 2020. After applying clinical eligibility criteria, 22,104 (3.76%) OHCA patients were deemed eligible for ECPR. The rate of ROSC increased with longer resuscitation time, which resulted in fewer ECPR candidates. The proportion of OHCA patients eligible for ECPR increased with older age cutoffs. Only 1.68% (9,889/588,203) of OHCA patients in the U.S. were eligible for ECPR based on a 45-minute transportation time to an ECMO-ready center model. CONCLUSIONS Less than 2% of OHCA patients are eligible for ECPR in the U.S. GIS models can identify the impact of clinical criteria, transportation time, and hospital capabilities on ECPR eligibility to inform future implementation strategies.
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Affiliation(s)
- Adam L Gottula
- Department of Emergency Medicine, University of Michigan, United States; Department of Anesthesiology, University of Michigan, United States; Max Harry Weil Institute for Critical Care Research and Innovation, United States.
| | - Christopher R Shaw
- Department of Medicine Division of Pulmonary and Critical Care, Oregon Health and Science University, United States
| | - Kari L Gorder
- The Carl and Edyth Lindner Center for Research and Education, The Christ Hospital, United States.
| | - Bennett H Lane
- Department of Emergency Medicine, University of Cincinnati, United States.
| | - Jennifer Latessa
- Department of Planning, The University of Cincinnati, United States.
| | - Man Qi
- Department of Geography and Geographic Information System, The University of Cincinnati, United States.
| | - Amy Koshoffer
- University of Cincinnati Libraries, The University of Cincinnati, United States.
| | - Rabab Al-Araji
- Department of Emergency Medicine, Emory University, United States; The Cardiac Arrest Registry to Enhance Survival, United States.
| | - Wesley Young
- College of Medicine, The University of Cincinnati, United States
| | - Jordan Bonomo
- Department of Emergency Medicine, University of Cincinnati, United States; Department of Neurosurgery, University of Cincinnati, United States.
| | - James R Langabeer
- Department of Emergency, Medicine McGovern School of Medicine, The University of Texas Health Center, United States; UT School of Public Health, The University of Texas Health Center, United States; School of Biomedical Informatics, The University of Texas Health Center, United States.
| | | | - Timothy D Henry
- The Carl and Edyth Lindner Center for Research and Education, The Christ Hospital, United States.
| | - Cindy H Hsu
- Department of Emergency Medicine, University of Michigan, United States; Max Harry Weil Institute for Critical Care Research and Innovation, United States; Department of Surgery, University of Michigan, United States.
| | - Justin L Benoit
- Department of Emergency Medicine, University of Cincinnati, United States.
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Sadvari J, Koshoffer A, Gorham RB, Phillips K. GIS Day across the Association of Research Libraries: Outreach, Education, and Collaboration. Journal of Map & Geography Libraries 2020. [DOI: 10.1080/15420353.2021.1944950] [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: 10/20/2022]
Affiliation(s)
- Joshua Sadvari
- University Libraries, The Ohio State University, Columbus, Ohio, USA
| | - Amy Koshoffer
- UC Libraries, University of Cincinnati, Cincinnati, Ohio, USA
| | - R. Benjamin Gorham
- Kelvin Smith Library, Case Western Reserve University, Cleveland, Ohio, USA
| | - Katie Phillips
- Center for Urban and Regional Analysis, The Ohio State University, Columbus, Ohio, USA
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Koshoffer A, Neeser AE, Newman L, Johnston LR. Giving datasets context: a comparison study of institutional repositories that apply varying degrees of curation. IJDC 2018. [DOI: 10.2218/ijdc.v13i1.632] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This research study compared four academic libraries’ approaches to curating the metadata of dataset submissions in their institutional repositories and classified them in one of four categories: no curation, pre-ingest curation, selective curation, and post-ingest curation. The goal is to understand the impact that curation may have on the quality of user-submitted metadata. The findings were 1) the metadata elements varied greatly between institutions, 2) repositories with more options for authors to contribute metadata did not result in more metadata contributed, 3) pre- or post-ingest curation process could have a measurable impact on the metadata but are difficult to separate from other factors, and 4) datasets submitted to a repository with pre- or post-ingest curation more often included documentation.
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Mosenson JA, Flood K, Klarquist J, Eby JM, Koshoffer A, Boissy RE, Overbeck A, Tung RC, Le Poole IC. Preferential secretion of inducible HSP70 by vitiligo melanocytes under stress. Pigment Cell Melanoma Res 2014; 27:209-20. [PMID: 24354861 DOI: 10.1111/pcmr.12208] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [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: 08/02/2013] [Accepted: 12/16/2013] [Indexed: 11/30/2022]
Abstract
Inducible HSP70 (HSP70i) chaperones peptides from stressed cells, protecting them from apoptosis. Upon extracellular release, HSP70i serves an adjuvant function, enhancing immune responses to bound peptides. We questioned whether HSP70i differentially protects control and vitiligo melanocytes from stress and subsequent immune responses. We compared expression of HSP70i in skin samples, evaluated the viability of primary vitiligo and control melanocytes exposed to bleaching phenols, and measured secreted HSP70i. We determined whether HSP70i traffics to melanosomes to contact immunogenic proteins by cell fractionation, western blotting, electron microscopy, and confocal microscopy. Viability of vitiligo and control melanocytes was equally affected under stress. However, vitiligo melanocytes secreted increased amounts of HSP70i in response to MBEH, corroborating with aberrant HSP70i expression in patient skin. Intracellular HSP70i colocalized with melanosomes, and more so in response to MBEH in vitiligo melanocytes. Thus, whereas either agent is cytotoxic to melanocytes, MBEH preferentially induces immune responses to melanocytes.
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Affiliation(s)
- Jeffrey A Mosenson
- Departments of Pathology and Microbiology & Immunology/Cardinal Bernardin Cancer Center, Loyola University Chicago, Maywood, IL, USA
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Ebanks JP, Koshoffer A, Wickett RR, Hakozaki T, Boissy RE. Hydrolytic enzymes of the interfollicular epidermis differ in expression and correlate with the phenotypic difference observed between light and dark skin. J Dermatol 2012; 40:27-33. [DOI: 10.1111/j.1346-8138.2012.01634.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2011] [Accepted: 05/08/2012] [Indexed: 11/30/2022]
Affiliation(s)
| | - Amy Koshoffer
- Department of Dermatology; University of Cincinnati; Cincinnati; Ohio; USA
| | | | | | - Raymond E. Boissy
- Department of Dermatology; University of Cincinnati; Cincinnati; Ohio; USA
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Kadekaro AL, Leachman S, Kavanagh RJ, Swope V, Cassidy P, Supp D, Sartor M, Schwemberger S, Babcock G, Wakamatsu K, Ito S, Koshoffer A, Boissy RE, Manga P, Sturm RA, Abdel-Malek ZA. Melanocortin 1 receptor genotype: an important determinant of the damage response of melanocytes to ultraviolet radiation. FASEB J 2010; 24:3850-60. [PMID: 20519635 DOI: 10.1096/fj.10-158485] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The melanocortin 1 receptor gene is a main determinant of human pigmentation, and a melanoma susceptibility gene, because its variants that are strongly associated with red hair color increase melanoma risk. To test experimentally the association between melanocortin 1 receptor genotype and melanoma susceptibility, we compared the responses of primary human melanocyte cultures naturally expressing different melanocortin 1 receptor variants to α-melanocortin and ultraviolet radiation. We found that expression of 2 red hair variants abolished the response to α-melanocortin and its photoprotective effects, evidenced by lack of functional coupling of the receptor, and absence of reduction in ultraviolet radiation-induced hydrogen peroxide generation or enhancement of repair of DNA photoproducts, respectively. These variants had different heterozygous effects on receptor function. Microarray data confirmed the observed differences in responses of melanocytes with functional vs. nonfunctional receptor to α-melanocortin and ultraviolet radiation, and identified DNA repair and antioxidant genes that are modulated by α-melanocortin. Our findings highlight the molecular mechanisms by which the melanocortin 1 receptor genotype controls genomic stability of and the mutagenic effect of ultraviolet radiation on human melanocytes.
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Affiliation(s)
- Ana Luisa Kadekaro
- Department of Dermatology, University of Cincinnati College of Medicine, 231 Albert Sabin Way, Cincinnati, OH 45267-0592, USA
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8
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Westbroek W, Adams D, Huizing M, Koshoffer A, Dorward H, Tinloy B, Parkes J, Helip-Wooley A, Kleta R, Tsilou E, Duvernay P, Digre KB, Creel DJ, White JG, Boissy RE, Gahl WA. Cellular defects in Chediak-Higashi syndrome correlate with the molecular genotype and clinical phenotype. J Invest Dermatol 2007; 127:2674-7. [PMID: 17554367 DOI: 10.1038/sj.jid.5700899] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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9
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Helip-Wooley A, Westbroek W, Dorward HM, Koshoffer A, Huizing M, Boissy RE, Gahl WA. Improper trafficking of melanocyte-specific proteins in Hermansky-Pudlak syndrome type-5. J Invest Dermatol 2007; 127:1471-8. [PMID: 17301833 PMCID: PMC8369813 DOI: 10.1038/sj.jid.5700737] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Hermansky-Pudlak syndrome (HPS) is a disorder of lysosome-related organelle biogenesis resulting in melanosome dysfunction and absent platelet dense bodies. HPS patients have oculocutaneous albinism, bruising, and bleeding. HPS-5 results from deficiency of the HPS5 protein, a component of the biogenesis of lysosome-related organelles complex-2 (BLOC-2). HPS5 has an unknown function and lacks homology to known proteins. We performed ultrastructural studies of HPS-5 melanocytes revealing predominantly early-stage melanosomes with many small 3,4(OH)2-phenylalanine-positive vesicles throughout the cell body and dendrites. These findings resemble the distinct ultrastructural features of HPS-3 melanocytes; HPS3 is also a BLOC-2 component. Immunofluorescence and immunoEM studies showed decreased TYRP1 labeling in the dendrites of HPS-5 melanocytes, and the overall abundance of TYRP1 was reduced. No substantial differences were observed in the distribution or abundance of Pmel17 in HPS-5 melanocytes. In normal melanocytes, endogenous tyrosinase colocalized with Pmel17 and TYRP1 in the perinuclear area and dendritic tips; this was much reduced in HPS-5 melanocytes, particularly in the tips. We conclude that early stage melanosome formation and Pmel17 trafficking are preserved in HPS5-deficient cells. Tyrosinase and TYRP1 are mistrafficked, however, and fail to be efficiently delivered to melanosomes of HPS-5 melanocytes.
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Affiliation(s)
- Amanda Helip-Wooley
- Section on Human Biochemical Genetics, Medical Genetics Branch, National Human Genome Research Institute, NIH, Bethesda, Maryland 20892-1851, USA.
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10
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Smith JW, Koshoffer A, Morris RE, Boissy RE. Membranous complexes characteristic of melanocytes derived from patients with Hermansky-Pudlak syndrome type 1 are macroautophagosomal entities of the lysosomal compartment. Pigment Cell Res 2005; 18:417-26. [PMID: 16280007 PMCID: PMC1635962 DOI: 10.1111/j.1600-0749.2005.00265.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [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: 11/29/2022]
Abstract
Hermansky-Pudlak syndrome (HPS) is an autosomal recessive disorder resulting from mutations in a family of genes required for efficient transport of lysosomal-related proteins from the trans-Golgi network to a target organelle. To date, there are several genetically distinct forms of HPS. Many forms of HPS exhibit aberrant trafficking of melanosome-targeted proteins resulting in incomplete melanosome biogenesis responsible for oculocutaneous albinism observed in patients. In HPS-1, melanosome-targeted proteins are localized to characteristic membranous complexes, which have morphologic similarities to macroautophagosomes. In this report, we evaluated the hypothesis that HPS-1-specific membranous complexes comprise a component of the lysosomal compartment of melanocytes. Using indirect immunofluorescence, an increase in co-localization of misrouted tyrosinase with cathepsin-L, a lysosomal cysteine protease, occurred in HPS-1 melanocytes. In addition, ribophorin II, an integral endoplasmic reticulum protein that is also a component of macroautophagosomes, and LC3, a specific marker of macrophagosomes, demonstrated localization to membranous complexes in HPS-1 melanocytes. At the electron microscopic level, the membranous complexes exhibited acid phosphatase activity and localization of exogenously supplied horseradish peroxidase (HRP)-conjugated gold particles, indicating incorporation of lysosomal and endosomal components to membranous complexes, respectively. These results confirm that membranous complexes of HPS-1 melanocytes are macroautophagosomal representatives of the lysosomal compartment.
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Affiliation(s)
| | | | - Randal E. Morris
- Cell Biology, Neurobiology & Anatomy, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Raymond E. Boissy
- Department of Dermatology and
- Cell Biology, Neurobiology & Anatomy, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
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11
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Greatens A, Hakozaki T, Koshoffer A, Epstein H, Schwemberger S, Babcock G, Bissett D, Takiwaki H, Arase S, Wickett RR, Boissy RE. Effective inhibition of melanosome transfer to keratinocytes by lectins and niacinamide is reversible. Exp Dermatol 2005; 14:498-508. [PMID: 15946237 DOI: 10.1111/j.0906-6705.2005.00309.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Skin pigmentation results in part from the transfer of melanized melanosomes synthesized by melanocytes to neighboring keratinocytes. Plasma membrane lectins and their glycoconjugates expressed by these epidermal cells are critical molecules involved in this transfer process. In addition, the derivative of vitamin B(3), niacinamide, can inhibit melanosome transfer and induce skin lightening. We investigated the effects of these molecules on the viability of melanocytes and keratinocytes and on the reversibility of melanosome-transfer inhibition induced by these agents using an in vitro melanocyte-keratinocyte coculture model system. While lectins and neoglycoproteins could induce apoptosis in a dose-dependent manner to melanocytes or keratinocytes in monoculture, similar dosages of the lectins, as opposed to neoglycoproteins, did not induce apoptosis to either cell type when treated in coculture. The dosages of lectins and niacinamide not affecting cell viability produced an inhibitory effect on melanosome transfer, when used either alone or together in cocultures of melanocytes-keratinocytes. Cocultures treated with lectins or niacinamide resumed normal melanosome transfer in 3 days after removal of the inhibitor, while cocultures treated with a combination of lectins and niacinamide demonstrated a lag in this recovery. Subsequently, we assessed the effect of niacinamide on facial hyperpigmented spots using a vehicle-controlled, split-faced design human clinical trial. Topical application of niacinamide resulted in a dose-dependent and reversible reduction in hyperpigmented lesions. These results suggest that lectins and niacinamide at concentrations that do not affect cell viability are reversible inhibitors of melanosome transfer.
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Affiliation(s)
- Amanda Greatens
- Department of Dermatology, University of Cincinnati, Cincinnati, OH, USA
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12
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Boissy RE, Richmond B, Huizing M, Helip-Wooley A, Zhao Y, Koshoffer A, Gahl WA. Melanocyte-specific proteins are aberrantly trafficked in melanocytes of Hermansky-Pudlak syndrome-type 3. Am J Pathol 2005; 166:231-40. [PMID: 15632015 PMCID: PMC1602298 DOI: 10.1016/s0002-9440(10)62247-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Hermansky-Pudlak Syndrome-type 3 (HPS-3) is a relatively mild subtype of HPS with minimal cutaneous and ocular depigmentation. The HPS-3 gene encodes a novel protein of unknown function with a predicted molecular weight of 114 kd. To assess the role of the HPS3 protein in melanization, cultured melanocytes developed from HPS-3 patients were evaluated biochemically and histologically for activity and localization of melanocyte-specific proteins. Endogenous tyrosinase activity of HPS-3 melanocytes was substantial, but tyrosinase activity and melanin synthesis was suppressed in intact melanocytes. However, the level of suppression, as well as extent to which up-regulation by isobutylmethylxanthine and cholera toxin was muted, was less that in HPS-1 melanocytes. Ultrastructurally, HPS-3 melanocytes contained morphologically normal melanosomes, predominantly of stage I and II with minimal stage III and few stage IV melanosomes. Dihydroxyphenylalanine (DOPA) histochemistry demonstrated an increase in melanization of melanosomes. Unique to HPS-3 melanocytes were numerous DOPA-positive 50-nm vesicles and tubular elements present throughout the cell body and dendrites. Tyrosinase, tyrosinase-related protein-1 (Tyrp1), dopachrome tautomerase (Dct), and LAMP1 and 3 localization in HPS-3 melanocytes, as evaluated by immunocytochemistry and confocal microscopy, demonstrated a fine, floccular distribution in contrast to the coarse, granular distribution characteristic of control melanocytes. The localization profile of other proteins expressed by melanocytes (ie, Silver/Pmel17, Melan-A/MART-1, LAMP2, Rab 27, transferrin, c-kit, adaptin-3, and the HPS1 protein) appeared normal. These results suggest that a specific subset of melanocyte proteins are aberrantly trafficked throughout the HPS-3 melanocyte and may be responsible for the reduction in melanin synthesis.
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Affiliation(s)
- Raymond E Boissy
- Department of Dermatology, University of Cincinnati College of Medicine, 231 Albert Sabin Way, ML-0592, Cincinnati, OH 45267-0592, USA.
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13
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Richmond B, Huizing M, Knapp J, Koshoffer A, Zhao Y, Gahl WA, Boissy RE. Melanocytes derived from patients with Hermansky-Pudlak Syndrome types 1, 2, and 3 have distinct defects in cargo trafficking. J Invest Dermatol 2005; 124:420-7. [PMID: 15675963 PMCID: PMC1635963 DOI: 10.1111/j.0022-202x.2004.23585.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [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] [Indexed: 12/15/2022]
Abstract
Hermansky-Pudlak Syndrome (HPS) is a genetically heterogeneous disorder in which mutations in one of several genes interrupts biogenesis of melanosomes, platelet dense bodies, and lysosomes. Affected patients have oculocutaneous albinism, a bleeding diathesis, and sometimes develop granulomatous colitis or pulmonary fibrosis. In order to assess the role of HPS genes in melanosome biogenesis, melanocytes cultured from patients with HPS subtypes 1, 2, or 3 were assessed for the localization of various melanocyte proteins. Tyrosinase, Tyrp1, and Dct/Tyrp2 were atypically and distinctly expressed in HPS-1 and HPS-3 melanocytes, whereas only tyrosinase showed an atypical distribution in HPS-2 melanocytes. The HPS1 and AP3B1 (i.e., HPS-2) gene products showed no expression in HPS-1 and HPS-2 melanocytes, respectively, whereas HPS-3 melanocytes exhibited normal expression for both proteins. In normal human melanocytes, the HPS1 protein was expressed as an approximately 80 kDa molecule with both granular and reticular intracellular profiles. In HPS-1, lysosome associated membrane protein 1 (LAMP1), and LAMP3 were localized to abnormal large granules; in HPS-2, all LAMPs exhibited a normal granular expression; and in HPS-3, LAMP1, and LAMP3 exhibited a distinct less granular and more floccular pattern. In contrast, the expressions of Rab 27, transferrin, and cKit were unaffected in all three HPS genotypes. These data demonstrate that the three initially identified subtypes of human HPS exhibit distinct defects in the trafficking of various melanocyte-specific proteins.
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Affiliation(s)
- Bonnie Richmond
- Department of Dermatology, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Marjan Huizing
- Section on Human Biochemical Genetics, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Jill Knapp
- Department of Dermatology, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Amy Koshoffer
- Department of Dermatology, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - Yang Zhao
- Department of Dermatology, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
| | - William A. Gahl
- Section on Human Biochemical Genetics, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Raymond E. Boissy
- Department of Dermatology, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
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Warren MA, Koshoffer A, Aronow BJ, Jegga AG, Brackenbury R. Structure of the 5' portion of the human plakoglobin gene. J Invest Dermatol 2002; 119:196-7. [PMID: 12164947 DOI: 10.1046/j.1523-1747.2002.18175.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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Nikiforov YE, Koshoffer A, Nikiforova M, Stringer J, Fagin JA. Chromosomal breakpoint positions suggest a direct role for radiation in inducing illegitimate recombination between the ELE1 and RET genes in radiation-induced thyroid carcinomas. Oncogene 1999; 18:6330-4. [PMID: 10597232 DOI: 10.1038/sj.onc.1203019] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The RET/PTC3 rearrangement is formed by fusion of the ELE1 and RET genes, and is highly prevalent in radiation-induced post-Chernobyl papillary thyroid carcinomas. We characterized the breakpoints in the ELE1 and RET genes in 12 post-Chernobyl pediatric papillary carcinomas with known RET/PTC3 rearrangement. We found that the breakpoints within each intron were distributed in a relatively random fashion, except for clustering in the Alu regions of ELE1. None of the breakpoints occurred at the same base or within a similar sequence. There was also no evidence of preferential cleavage in AT-rich regions or other target DNA sites implicated in illegitimate recombination in mammalian cells. Modification of sequences at the cleavage sites was minimal, typically involving a 1-3 nucleotide deletion and/or duplication. Surprisingly, the alignment of ELE1 and RET introns in opposite orientation revealed that in each tumor the position of the break in one gene corresponded to the position of the break in the other gene. This tendency suggests that the two genes may lie next to each other but point in opposite directions in the nucleus. Such a structure would facilitate formation of RET/PTC3 rearrangements because a single radiation track could produce concerted breaks in both genes, leading to inversion due to reciprocal exchange via end-joining.
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MESH Headings
- Adolescent
- Base Sequence
- Biomarkers, Tumor/genetics
- Carcinoma, Papillary/diagnosis
- Carcinoma, Papillary/genetics
- Carcinoma, Papillary/pathology
- Child
- Child, Preschool
- Chromosomes, Human, Pair 10/genetics
- Chromosomes, Human, Pair 10/radiation effects
- Chromosomes, Human, Pair 18/genetics
- Chromosomes, Human, Pair 18/radiation effects
- DNA/radiation effects
- DNA Damage
- DNA Repair
- Diagnosis, Differential
- Female
- Gene Expression Regulation, Neoplastic
- Humans
- Introns
- Male
- Neoplasm Proteins/genetics
- Neoplasms, Radiation-Induced/diagnosis
- Neoplasms, Radiation-Induced/genetics
- Nuclear Receptor Coactivators
- Oncogene Proteins/genetics
- Oncogenes
- Power Plants
- Radioactive Hazard Release
- Recombination, Genetic
- Sequence Deletion
- Thyroid Neoplasms/diagnosis
- Thyroid Neoplasms/genetics
- Thyroid Neoplasms/pathology
- Transcription Factors
- Translocation, Genetic
- Ukraine
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Affiliation(s)
- Y E Nikiforov
- Department of Pathology, University of Cincinnati College of Medicine, OH 45267-0529, USA
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