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Lonner B, Eaker L, Hoernschemeyer D, Zhang J, Wilczek A, Elliot P, Boeyer ME, Fletcher ND, Alanay A, Yilgor C, Newton P, Miyanji F. Double major curvature treated with vertebral body tethering of both curves: how do outcomes compare to posterior spinal fusion? Spine Deform 2024; 12:651-662. [PMID: 38285163 DOI: 10.1007/s43390-023-00803-w] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 12/09/2023] [Indexed: 01/30/2024]
Abstract
PURPOSE Vertebral body tethering (VBT) is a non-fusion alternative to posterior spinal fusion (PSF). There have been few reports on VBT of two curvatures. We aim to compare the radiographic outcomes between VBT and PSF in patients with double curvatures in which both curves were instrumented. METHODS 29 AIS patients matched by Lenke, age (± 2 years), triradiate cartilage closure status, major Cobb angle (± 8°), and T5-T12 kyphosis (± 10°). Variables were compared using Wilcoxon rank-sum tests, Student's t tests, and chi-Square. Clinical success was defined as major curve < 35°. RESULTS Group baseline demographics were similar. Major thoracic (T) curve types had significantly better major (VBT 51.5 ± 7.9° to 31.6 ± 12.0° [40%] vs. PSF 54.3 ± 7.4° to 17.4 ± 6.5° [68%]; p = 0.0002) and secondary curve correction in the PSF group. 71% of major T VBT patients were clinically successful versus 100% of PSF. Major thoracolumbar (TL) curve types experienced comparable major (VBT 52.3 ± 7.0° to 18.3 ± 11.4° (65%) vs. PSF 53.0 ± 5.2° to 23.8 ± 10.9° (56%); p = 0.2397) and secondary curve correction. 92% of major TL VBT patients were clinically successful versus 75% in the PSF group. There was no difference in T5-12 kyphosis or lumbar lordosis between groups for any curve type. There were 4 patients (13.8%) with major complications in the VBT group compared to 0 (0%) in the PSF. CONCLUSION Patients with double major AIS who underwent VBT with major T curve types had less correction than PSF; however, those with major TL curves experienced similar radiographic outcomes regardless of procedure. Complications were greater for VBT.
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Affiliation(s)
- Baron Lonner
- Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, Mount Sinai Spine, 5 E 98th St., New York, NY, 10029, USA.
| | - Lily Eaker
- Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, Mount Sinai Spine, 5 E 98th St., New York, NY, 10029, USA
| | | | - Jessica Zhang
- Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, Mount Sinai Spine, 5 E 98th St., New York, NY, 10029, USA
| | - Ashley Wilczek
- Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, Mount Sinai Spine, 5 E 98th St., New York, NY, 10029, USA
| | - Patrick Elliot
- Department of Orthopaedic Surgery, University of Missouri, Columbia, MO, USA
| | - Melanie E Boeyer
- Department of Orthopaedic Surgery, University of Missouri, Columbia, MO, USA
| | - Nicholas D Fletcher
- Department of Orthopaedics, Children's Healthcare of Atlanta, Atlanta, GA, USA
| | - Ahmet Alanay
- Department of Orthopedics and Traumatology, Acibadem Mehmet Ali Aydinlar University, Istanbul, Turkey
| | - Caglar Yilgor
- Department of Orthopedics and Traumatology, Acibadem Mehmet Ali Aydinlar University, Istanbul, Turkey
| | - Peter Newton
- Department of Orthopaedics, Rady Children's Hospital, San Diego, CA, USA
| | - Firoz Miyanji
- Department of Orthopedics, British Columbia Children's Hospital, Vancouver, BC, Canada
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Alasadi H, Rajjoub R, Alasadi Y, Wilczek A, Lonner BS. Vertebral body tethering for adolescent idiopathic scoliosis: a review. Spine Deform 2024; 12:561-575. [PMID: 38285164 DOI: 10.1007/s43390-023-00806-7] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 12/09/2023] [Indexed: 01/30/2024]
Abstract
PURPOSE Adolescent Idiopathic Scoliosis (AIS) remains the most common type of pediatric scoliosis, mostly affecting children between ages 10 and 18. Vertebral body tethering (VBT) offers a non-fusion alternative to the gold standard spinal fusion that permits flexibility and some growth within instrumented segments. This article will serve as a comprehensive literature review of the current state-of-the-art of VBT in relation to radiographic and clinical outcomes, complications, and the learning curve associated with the procedure. METHODS A systematic literature review was conducted on PubMed, Scopus, and Web of Science from April 2002 to December 2022. Studies were included if they discussed VBT and consisted of clinical studies in which a minimum 2-years follow-up was reported, and series that included anesthetic considerations, learning curve, and early operative morbidity. RESULTS Forty-nine studies spanning the period from April 2002 to December 2022 were reviewed. CONCLUSION This article illustrates the potential benefits and challenges of the surgical treatment of AIS with VBT and can serve as a basis for the further study and refinement of this technique ideally as a living document that will be updated regularly.
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Affiliation(s)
- Husni Alasadi
- Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Rami Rajjoub
- Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Yazan Alasadi
- Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Ashley Wilczek
- Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Baron S Lonner
- Department of Orthopaedic Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Chief of Minimally Invasive Scoliosis Surgery and Pediatric Spine, Department of Orthopaedic Surgery, Mount Sinai Hospital, Icahn School of Medicine, 5 E 98th St., 4th Floor, New York, NY, 10029, USA.
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Meyers J, Eaker L, Samdani A, Miyanji F, Herrera M, Wilczek A, Alanay A, Yilgor C, Hoernschemeyer D, Shah S, Newton P, Lonner B. Anterior vertebral body tethering shows clinically comparable shoulder balance outcomes to posterior spinal fusion. Spine Deform 2024:10.1007/s43390-024-00847-6. [PMID: 38517667 DOI: 10.1007/s43390-024-00847-6] [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: 09/19/2023] [Accepted: 02/14/2024] [Indexed: 03/24/2024]
Abstract
PURPOSE Posterior spinal fusion (PSF) is the current gold standard in surgical treatment for adolescent idiopathic scoliosis. Vertebral body tethering (VBT) is a fusionless alternative. Shoulder balance is an important metric for outcomes and patient satisfaction. Here we compare shoulder balance outcomes between PSF and VBT. METHODS In this retrospective review, the pre-operative and post-operative absolute radiographic shoulder height (|RSH|) of 45 PSF patients were compared to 46 VBT patients. Mean values were compared and then collapsed into discrete groups (|RSH| GROUP) and compared. Patients were propensity score matched. Regression models based on pretest-posttest designs were used to compare procedure type on post-operative outcomes. RESULTS Pre-operatively there were no differences in |RSH| between PSF and VBT, however, at latest post-operative follow-up PSF maintained a larger |RSH| imbalance compared to VBT (0.91 cm vs 0.63 cm, p = 0.021). In an ANCOVA regression, PSF was associated with a larger |RSH| imbalance compared to VBT, F(1, 88) = 5.76, p = 0.019. An ordinal logistic regression found that the odds ratio of being in a worse |RSH| GROUP for PSF vs VBT is 2.788 (95% CI = 1.099 to 7.075), a statistically significant effect χ2(1) = 4.658, p = 0.031. Results were similar in subgroup analyses of Lenke 1 and Lenke 2 patients, though to less statistical significance. CONCLUSION While PSF was found to be associated with worse |RSH| outcomes, the actual numbers (2-3 mm) are unlikely to be clinically meaningful. Thus, in this analysis, VBT can be said to show comparable shoulder balance outcomes to PSF.
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Affiliation(s)
- James Meyers
- Department of Orthopaedics, Mount Sinai Hospital, Icahn School of Medicine at Mount Sinai, 5 E 98th St., 4th Floor, New York, NY, 10029, USA
| | - Lily Eaker
- Department of Orthopaedics, Mount Sinai Hospital, Icahn School of Medicine at Mount Sinai, 5 E 98th St., 4th Floor, New York, NY, 10029, USA
| | - Amer Samdani
- Department of Neurosurgery, Shriners Hospital-Philadelphia, Philadelphia, PA, USA
| | - Firoz Miyanji
- Department of Orthopedics, British Columbia Children's Hospital, Vancouver, BC, Canada
| | - Michael Herrera
- Department of Orthopaedics, Mount Sinai Hospital, Icahn School of Medicine at Mount Sinai, 5 E 98th St., 4th Floor, New York, NY, 10029, USA
| | - Ashley Wilczek
- Department of Orthopaedics, Mount Sinai Hospital, Icahn School of Medicine at Mount Sinai, 5 E 98th St., 4th Floor, New York, NY, 10029, USA
| | - Ahmet Alanay
- Department of Orthopedics and Traumatology, Acibadem Mehmet Ali Aydinlar University, Istanbul, Turkey
| | - Caglar Yilgor
- Department of Orthopedics and Traumatology, Acibadem Mehmet Ali Aydinlar University, Istanbul, Turkey
| | | | - Suken Shah
- Department of Orthopaedics, Nemours Children's Hospital, Wilmington, DE, USA
| | - Peter Newton
- Department of Orthopaedics, Rady Children's Hospital, San Diego, CA, USA
| | - Baron Lonner
- Department of Orthopaedics, Mount Sinai Hospital, Icahn School of Medicine at Mount Sinai, 5 E 98th St., 4th Floor, New York, NY, 10029, USA.
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Miller EC, Wilczek A, Bello NA, Tom S, Wapner R, Suh Y. Pregnancy, preeclampsia and maternal aging: From epidemiology to functional genomics. Ageing Res Rev 2022; 73:101535. [PMID: 34871806 PMCID: PMC8827396 DOI: 10.1016/j.arr.2021.101535] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 11/15/2021] [Accepted: 12/01/2021] [Indexed: 01/03/2023]
Abstract
Women live longer than men but experience greater disability and a longer period of illness as they age. Despite clear sex differences in aging, the impact of pregnancy and its complications, such as preeclampsia, on aging is an underexplored area of geroscience. This review summarizes our current knowledge about the complex links between pregnancy and age-related diseases, including evidence from epidemiology, clinical research, and genetics. We discuss the relationship between normal and pathological pregnancy and maternal aging, using preeclampsia as a primary example. We review the results of human genetics studies of preeclampsia, including genome wide association studies (GWAS), and attempted to catalog genes involved in preeclampsia as a gateway to mechanisms underlying an increased risk of later life cardio- and neuro- vascular events. Lastly, we discuss challenges in interpreting the GWAS of preeclampsia and provide a functional genomics framework for future research needed to fully realize the promise of GWAS in identifying targets for geroprotective prevention and therapeutics against preeclampsia.
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Affiliation(s)
- Eliza C. Miller
- Department of Neurology, Division of Stroke and Cerebrovascular Disease, Columbia University Irving Medical Center, New York, NY, USA
| | - Ashley Wilczek
- Department of Obstetrics and Gynecology, Columbia University Irving Medical Center, New York, NY, USA
| | - Natalie A. Bello
- Department of Medicine, Division of Cardiology, Columbia University Irving Medical Center, New York, NY, USA
| | - Sarah Tom
- Department of Neurology, Division of Neurology Clinical Outcomes Research and Population Science and the Department of Epidemiology, Columbia University Irving Medical Center, New York, NY, USA
| | - Ronald Wapner
- Department of Obstetrics and Gynecology, Columbia University Irving Medical Center, New York, NY, USA.
| | - Yousin Suh
- Department of Obstetrics and Gynecology, Columbia University Irving Medical Center, New York, NY, USA; Department of Genetics and Development, Columbia University Irving Medical Center, New York, NY, USA.
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5
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Sticherling M, Franke A, Aberer E, Gläser R, Hertl M, Pfeiffer C, Rzany B, Schneider S, Shimanovich I, Werfel T, Wilczek A, Zillikens D, Schmidt E. An open, multicentre, randomized clinical study in patients with bullous pemphigoid comparing methylprednisolone and azathioprine with methylprednisolone and dapsone. Br J Dermatol 2017; 177:1299-1305. [PMID: 28494097 DOI: 10.1111/bjd.15649] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/05/2017] [Indexed: 12/28/2022]
Abstract
BACKGROUND Current treatment of bullous pemphigoid (BP) is based on the long-term use of topical and/or systemic corticosteroids, which are associated with a high rate of adverse events and increased mortality. OBJECTIVES To study the corticosteroid-sparing potential of azathioprine and dapsone. METHODS This was a prospective, multicentre, randomized, nonblinded clinical trial that compared the efficacy and safety of two parallel groups of patients with BP treated with oral methylprednisolone 0·5 mg kg-1 per day in combination with either azathioprine 1·5-2·5 mg kg-1 per day or dapsone 1·5 mg kg-1 per day. Nine German and Austrian departments of dermatology included 54 patients based on clinical lesions, positive direct immunofluorescence (IF) microscopy and detection of serum autoantibodies by indirect IF microscopy, immunoblotting or enzyme-linked immunosorbent assay. The primary end point was the time until complete tapering of methylprednisolone, and the most important secondary end point was the cumulative corticosteroid dose. RESULTS In eight patients (five azathioprine, three dapsone), methylprednisolone could be discontinued after a median time of 251 days in the azathioprine group and 81 days in the dapsone group. The median cumulative corticosteroid dose was 2·65 g for azathioprine compared with 1·92 g for dapsone (P = 0·06). The median numbers of days when corticosteroids were applied were 148 and 51, respectively (P = 0·24). No significant difference in the number of adverse events was seen between the treatment arms. Four patients (8%) died within the observation period of 12 months. CONCLUSIONS Due to the lower than intended number of patients, the results of the primary and secondary end points were not or only barely significant. Dapsone appeared to have a moderately higher corticosteroid-sparing potential than azathioprine. The combination regimen of either drug with oral methylprednisolone is associated with a relatively low 1-year mortality in this vulnerable patient population.
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Affiliation(s)
- M Sticherling
- Department of Dermatology, University of Leipzig, Leipzig, Germany.,Department of Dermatology, University of Erlangen, Ulmenweg 18, D-91054, Erlangen, Germany
| | - A Franke
- Center for Clinical Trials, University of Leipzig, Leipzig, Germany
| | - E Aberer
- Department of Dermatology, University of Graz, Graz, Austria
| | - R Gläser
- Department of Dermatology, University of Kiel, Kiel, Germany
| | - M Hertl
- Department of Dermatology, University of Erlangen, Ulmenweg 18, D-91054, Erlangen, Germany.,Department of Dermatology, University of Marburg, Marburg, Germany
| | - C Pfeiffer
- Department of Dermatology, University of Dresden, Dresden, Germany.,Department of Dermatology, University of Ulm, Ulm, Germany
| | - B Rzany
- Department of Dermatology, Charité-Medical University Berlin, Berlin, Germany
| | - S Schneider
- Department of Dermatology, University Münster, Münster, Germany.,Department of Dermatology, University of Mannheim, Mannheim, Germany
| | - I Shimanovich
- Department of Dermatology, University of Lübeck, Lübeck, Germany
| | - T Werfel
- Department of Dermatology, Medical University, Hannover, Germany
| | - A Wilczek
- Department of Dermatology, University of Leipzig, Leipzig, Germany
| | - D Zillikens
- Department of Dermatology, University of Lübeck, Lübeck, Germany.,Department of Dermatology, University of Würzburg, Würzburg, Germany
| | - E Schmidt
- Department of Dermatology, University of Lübeck, Lübeck, Germany.,Department of Dermatology, University of Würzburg, Würzburg, Germany
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Parol W, Kozela A, Ciepał I, Bodek K, Jamroz B, Kalantar-Nayestanaki N, Khatri G, Kistryn S, Kłos B, Kuboś J, Kulessa P, Magiera A, Mazumdar I, Messchendorp J, Rozpędzik D, Rusnok A, Skwira-Chalot I, Stephan E, Wilczek A, Włoch B, Wrońska A, Zejma J. Contribution of three nucleon force investigated in deuteron-proton breakup reaction. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201613007019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7
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Wilczek A, Weinryb R, Barber J, Petter Gustavsson J, Åsberg M. The core conflictual relationship theme (CCRT) and psychopathology in patients selected for dynamic psychotherapy. Psychother Res 2010. [DOI: 10.1093/ptr/10.1.100] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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8
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Noack-Wiemers F, Wilczek A, Tegetmeyer H, Simon JC. [Left hemifacial flushing and sweating]. Hautarzt 2006; 57:1138-42. [PMID: 17033794 DOI: 10.1007/s00105-006-1202-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- F Noack-Wiemers
- Klinik für Dermatologie, Venerologie und Allergologie, Universitätsklinikum Leipzig, Philipp-Rosenthal-Strasse 23-25, 04103 Leipzig.
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Eichhorn K, Noack-Wiemers F, Wilczek A. Saugcurettage bei Hyperhidrosis axillaris: Eine monozentrische Untersuchung bei 21 Patienten. Akt Dermatol 2004. [DOI: 10.1055/s-2004-835549] [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: 10/19/2022]
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Abstract
BACKGROUND Penicillin G (PenG) has successfully been used for therapy of dermal fibrosis in patients suffering from systemic sclerosis (SSc). However, there is little knowledge on the mechanism of the antifibrotic action of PenG. OBJECTIVE We studied the effects of PenG on dermal fibroblasts by analysing the influence of various amounts of PenG on the proliferation, synthesis and degradation of collagen by human dermal fibroblasts from healthy donors and 1 SSc patient (collagen high producer). METHODS Collagen metabolism of cultured dermal fibroblasts was studied by Northern hybridisation for mRNA of collagen I, proline-4-hydroxylase, lysyl hydroxylase, matrix metalloproteinase I and determination of collagen content in culture supernatants. RESULTS PenG did not alter the expression of the investigated mRNA, independently of the dosage and the incubation times used. The amount of collagen I protein was not influenced. CONCLUSION There is no evidence of a direct antifibrotic effect of PenG on dermal fibroblasts; therefore, other mechanisms might be responsible for its effect in the treatment of SSc patients.
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Affiliation(s)
- U Anderegg
- Department of Dermatology, Leipzig University, and Saxon Academy of Science, Leipzig, Germany.
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Wilczek A, Weinryb RM, Gustavsson PJ, Barber JP, Schubert J, Asberg M. Symptoms and character traits in patients selected for long-term psychodynamic psychotherapy. J Psychother Pract Res 1997; 7:23-34. [PMID: 9407473 PMCID: PMC3330478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In this naturalistic study of 55 outpatients selected for long-term psychodynamic psychotherapy, two Swedish assessment instruments are presented (the Karolinska Psychodynamic Profile and the Karolinska Scales of Personality), and the significance of psychodynamic criteria for the selection of patients is discussed. Thirty patients (55%) fulfilled criteria for a DSM-III-R diagnosis. The most prominent psychodynamically defined character pathology was found in the areas of coping with aggressive affects; dependency and separation; frustration tolerance; and impulse control. Some psychodynamically defined character traits, particularly poor frustration tolerance, were related to symptomatic suffering.
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Affiliation(s)
- A Wilczek
- Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden.
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Kondoh H, Wilczek A, Narimizu S, Mishima Y. Mouse fibroblast expressing human tyrosinase with DHICA-oxidase activity produces predominantly pheomelanin deposit in lysosome. Zoolog Sci 1996; 13:825-31. [PMID: 9107139 DOI: 10.2108/zsj.13.825] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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: 02/04/2023]
Abstract
The melanogenic gene-transfected cell system serves as a useful tool for the study of the symphonic relation between melanin synthesis and intracellular organelles such as melanosomes in melanocytes. We constructed melanin-producing mouse fibroblasts by transfection of human tyrosinase cDNA to investigate the intracellular changes caused by tyrosinase expression. DHICA-oxidase (5,6-dihydroxyindole-2-carboxylic acid oxidase) activity without TRP-1 (Tyrosinase Related Protein-1) expression in the cells suggested that human tyrosinase also possesses a DHICA-oxidase activities different from mouse tyrosinase. Electron microscopic observation indicated that melanin-deposit organelles have some lysosomal features. These properties of melanin-deposit organelles in tyrosinase expressing fibroblasts provide one evidence for the hypothesis that melanosome is the specialized lysosome in melanocytes.
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Affiliation(s)
- H Kondoh
- Mishima Institute for Dermatological Research, Kobe, Japan
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13
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Wilczek A, Kondoh H, Mishima Y. Composition of mammalian eumelanins: analyses of DHICA-derived units in pigments from hair and melanoma cells. Pigment Cell Res 1996; 9:63-7. [PMID: 8857667 DOI: 10.1111/j.1600-0749.1996.tb00090.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The proportions in which two eumelanin monomers, namely 5,6-dihydroxyindole-2-carboxylic acid (DHICA) and 5,6-dihydroxyindole (DHI), compose the eumelanin polymer are believed to determine properties of the pigment including its color. These proportions are, however, not well elucidated for naturally occurring eumelanins, largely because of methodological difficulties. In this study we estimate the content of DHICA-derived units in mammalian eumelanins using a combination of two analytical techniques: 1) quantitation of DHICA-derived eumelanin by measuring the yield of pyrrole-2,3,5-tricarboxylic acid (PTCA index) and 2) spectrophotometrical quantitation of total (DHI + DHICA) eumelanin at 350 nm (A350 index). The ratio of PTCA/A350 measured for melanins synthesized from DHI and DHICA mixed in various molar proportions correlates well with the content of DHICA in synthetic polymers. Using this relationship as a standard curve we estimated the proportion of DHICA-derived units in mammalian eumelanins from hair and melanoma cells and found it to be much higher in rodent pigments (58.8%-98.3%; two species, mouse and hamster were examined) as compared to human eumelanins (19.2%-41.8%; one Caucasian and one Oriental individual were examined). No relationship between proportion of DHICA-derived units in eumelanin and hair color is found. The latter seems to be determined predominantly by the ratio of pheo- to eumelanin synthesis.
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Affiliation(s)
- A Wilczek
- Mishima Institute for Dermatological Research, Kobe, Japan
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14
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Kondoh H, Wilczek A, Mishima Y. 155 The role of dopachrome tautomerase in eumelanogenesis: Clone analyses of mouse B16 melanoma subclones and of TRP-2 cDNA transfected-human melanoma cells. J Dermatol Sci 1995. [DOI: 10.1016/0923-1811(95)93869-3] [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: 11/26/2022]
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Wilczek A, Mishima Y. Inhibitory effects of melanin monomers, dihydroxyindole-2-carboxylic acid (DHICA) and dihydroxyindole (DHI) on mammalian tyrosinase, with a special reference to the role of DHICA/DHI ratio in melanogenesis. Pigment Cell Res 1995; 8:105-12. [PMID: 7659677 DOI: 10.1111/j.1600-0749.1995.tb00649.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
DOPAchrome tautomerase (DCT) is known to control the ratio of DHICA/DHI formed within the melanocyte, but physiologic significance of this activity is not yet fully elucidated. In this study the two melanin monomers are shown to inhibit with different efficacy the initial, tyrosinase-controlled, melanogenic reaction, namely conversion of L-tyrosine to DOPAchrome (2-carboxy-2,3-dihydroindole-5,6-quinone). This is demonstrated in the test tube assay system whereby formation of DOPAchrome is catalyzed by i) isolated premelanosomes (PMS), ii) tyrosinase-rich PMS glycoproteins, or iii) tyrosinase purified from fibroblasts transfected with human tyrosinase gene. Both DHI and DHICA suppress the conversion of L-tyrosine to DOPAchrome when added to reaction mixture but the inhibitory effect is far more strongly pronounced by DHI. DHI inhibits both activities of tyrosinase--tyrosine-hydroxylation and DOPA-oxidation--more strongly than DHICA. The different extent of inhibition is shown to reflect i) the ability of the two monomers to compete with tyrosinase substrates for the enzyme's active center and ii) the rate of interaction between melanin monomers and DOPAquinone. Consequently, we demonstrate that the tyrosinase-catalyzed DOPAchrome formation can be modulated by the ratio of DHICA/DHI among melanin monomers with the increased proportion of DHICA resulting in more efficient DOPAchrome formation. These results raise the possibility that DOPAchrome tautomerase plays a role in positive control of the tyrosinase-catalyzed early phase of melanogenesis.
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Affiliation(s)
- A Wilczek
- Mishima Insitute for Dermatological Research, Kobe Kaisei Hospital, Japan
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16
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Kondoh H, Wilczek A, Mishima Y. Stable expression of human TRP-2 (tyrosinase-related protein-2) cDNA in mouse fibroblasts. J Dermatol Sci 1994. [DOI: 10.1016/0923-1811(94)90463-4] [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: 10/25/2022]
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Mishima Y, Wilczek A. DHICA-genesis as controlling factor in melanogenesis. J Dermatol Sci 1994. [DOI: 10.1016/0923-1811(94)90462-6] [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: 10/25/2022]
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Wilczek A, Mishima Y. Regulatory factors for polymerization of melanin monomers within coated vesicles and premelanosomes in melanoma cells. Melanoma Res 1993; 3:255-62. [PMID: 8219758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Coated vesicles (CV) and premelanosomes (PMS) differ in the amount of melanin monomers produced from 2-carboxy-2,3-dihydroindole-5,6-quinone (dopachrome) in vitro. CV convert dopachrome preferentially to 5,6-dihydroxy-indole-2-carboxylic acid (DHI2C) and PMS mainly to 5,6-dihydroxyindole (DHI). We examined the effect of CV and PMS on in vitro spontaneous polymerization of DHI and DHI2C. The polymerization of DHI is accelerated by addition of extracts from both CV and PMS, while polymerization of DHI2C is suppressed. Factors associated with these two regulatory activities have been separated on concanavalin A-Sepharose. The ConA-adhesive glycoproteins isolated from PMS enhance polymerization of not only DHI but also DHI2C. The latter effect is stimulated by dopa. Both accelerating activities can be inhibited by phenylthiourea (PTU). In contrast to glycoproteins, the non-glycoprotein subfraction suppresses spontaneous polymerization of both melanin monomers. Our data suggest that the absence of in vivo melanin polymer formation within CV can be explained by formation by these organelles of relatively stable DHI2C rather than easily polymerizing DHI.
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Affiliation(s)
- A Wilczek
- Mishima Institute for Dermatological Research, Kobe, Japan
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Abstract
Pigmented hamster melanoma tumors growing in situ contain two subpopulations of melanoma cells that have different electrophoretic mobilities (EPM). A mild neuraminidase treatment, which removes sialic acid residues from the cell surface glycoproteins, reduces the EPM of both groups of melanoma cells yielding an electrophoretically uniform population. This shows that the differences in the EPM between the subpopulations of pigmented melanoma cells stem from the different content of sialic acid residues on the cell surface. The relationship between the different EPM melanoma cell subpopulations was, therefore, examined during tumor growth, development, and formation of metastases. The relative content of cells having high electrophoretic mobility, the "fast moving" cells, increases as the tumors grow larger. However, tumors of the same diameter contain nearly the same fraction of "fast moving" cells despite their age. The proportion of the "fast moving" cells is significantly higher in the central part than in the outermost layer of pigmented melanoma tumors. These data suggest that the development of "fast moving" cells is promoted by some size-dependent changes in the intratumor environment. In vivo selection of melanoma cells for their ability to colonize lungs renders tumors that reveal elevated metastatic potential and contain a significantly higher fraction of cells possessing high electrophoretic mobility than the parent tumor. Moreover, the metastatic nodules contain a remarkably elevated fraction of the "fast moving" cells. The reported correlation between the "fast moving" cell fraction and the metastatic potential suggests that the relative content of cells having high electrophoretic mobility may determine the metastaticity of pigmented hamster melanoma.
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Affiliation(s)
- K Hyrc
- Jagiellonian University, Institute of Molecular Biology, Kraków, Poland
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