1
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Wang KL, Crum OM, Swanson AA, Johnson EF. Cutaneous metastasis of uterine carcinosarcoma mimicking drug eruption. JAAD Case Rep 2024; 47:44-46. [PMID: 38645799 PMCID: PMC11033079 DOI: 10.1016/j.jdcr.2024.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/23/2024] Open
Affiliation(s)
- Katherine L. Wang
- Mayo Clinic Alix School of Medicine, Mayo Clinic, Jacksonville, Florida
| | - Olivia M. Crum
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota
| | - Amy A. Swanson
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Emma F. Johnson
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
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2
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Colbert MD, Youssef MJ, Lehman JS, Johnson EF. A Case of Early Morphea Mimicking Hypopigmented Mycosis Fungoides in a Pediatric Patient. Am J Dermatopathol 2024; 46:235-237. [PMID: 38457743 DOI: 10.1097/dad.0000000000002646] [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: 03/10/2024]
Affiliation(s)
| | - Molly J Youssef
- Department of Dermatology, Mayo Clinic, Rochester, MN
- Mayo Clinic Children's Center, Mayo Clinic, Rochester, MN; and
| | - Julia S Lehman
- Department of Dermatology, Mayo Clinic, Rochester, MN
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, MN
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
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3
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Dehner CA, Johnson EF, Wieland CN, Camilleri MJ, Kajdacsy-Balla A, Oliveira AM, Halling KC, Gupta S, Guo R. Fusion-driven cutaneous and superficial mesenchymal and adnexal tumors-A clinicopathologic and molecular study of 15 cases, including a novel case of ACTB::ZMIZ2-rearranged adnexal carcinoma. J Cutan Pathol 2024. [PMID: 38556256 DOI: 10.1111/cup.14610] [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: 09/27/2023] [Revised: 02/22/2024] [Accepted: 03/13/2024] [Indexed: 04/02/2024]
Abstract
BACKGROUND While the list of fusion-driven soft tissue neoplasms is expanding rapidly, their importance among cutaneous and superficial mesenchymal and adnexal neoplasms remains poorly understood. This challenge is especially evident in cases with ambiguous histopathology that are difficult to classify based on morphology. AIMS Our goal was to investigate the benefits of next-generation sequencing in diagnosing complex cutaneous neoplasms. MATERIALS & METHODS Departmental archives were searched for fusion-driven cutaneous neoplasms. Slides were retrieved and clinical information including follow-up was obtained. RESULTS Fifteen cases occurred in eight female and seven male patients, with a median age of 26 years (range: 1-83) at diagnosis. Tumors involved the extremities (9), scalp (5), and head and neck (1). Predominant features included myoepithelial (5), nested spindled with clear cytoplasm (2), atypical adnexal/squamoid (2), small round blue cell (2), cellular spindled (3), and fibrohistiocytic morphology (1). Most frequently encountered fusions involved EWSR1 (6) fused to ERG (1), FLI1 (1), CREB1 (2), CREM (1), PBX3 (1), followed by PLAG1 (4) with LIFR (2), TRPS1 (1) and CHCHD7. Additional fusions encountered were YAP1::NUTM1, EML4::ALK, SS18::SSX1 (2), and a novel fusion: ACTB::ZMIZ2. Integration of histologic features and molecular findings led to final diagnoses of primary cutaneous Ewing sarcoma (2), soft tissue myoepithelioma (4), cutaneous syncytial myoepithelioma (1), cutaneous adnexal carcinoma (1), porocarcinoma (1), inflammatory myofibroblastic tumor (1), synovial sarcoma (2), clear cell sarcoma (2), and angiomatoid fibrous histiocytoma (1). DISCUSSION AND CONCLUSION Our results show that fusion testing can be a helpful diagnostic tool, especially in cases with unusual or uncommon morphology in superficial sites. Furthermore, it can allow for the identification of potential therapeutic targets in some instances.
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Affiliation(s)
- Carina A Dehner
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Anatomic Pathology and Laboratory Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Emma F Johnson
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Carrie N Wieland
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Michael J Camilleri
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | | | - Andre M Oliveira
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Kevin C Halling
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Sounak Gupta
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Ruifeng Guo
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Jacksonville, Florida, USA
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4
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Xie F, Lehman JS, Baban F, Johnson EF, Theiler RN, Todd A, Davis DMR. Pemphigoid gestationis and polymorphic eruption of pregnancy: treatment and outcomes in a retrospective cohort study. Int J Dermatol 2024; 63:e29-e32. [PMID: 37916499 DOI: 10.1111/ijd.16884] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 10/01/2023] [Accepted: 10/12/2023] [Indexed: 11/03/2023]
Affiliation(s)
- Fangyi Xie
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - Julia S Lehman
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Farah Baban
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
- Division of Anatomic and Clinical Pathology, Mayo Clinic, Rochester, MN, USA
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Regan N Theiler
- Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, MN, USA
| | - Austin Todd
- Department of Biostatistics, Mayo Clinic, Rochester, MN, USA
| | - Dawn M R Davis
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA
- Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, MN, USA
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5
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Ansari AN, Johnson EF, Wang KL, Koster MJ, Cantwell HM. SARS-CoV-2 induced IgA vasculitis confirmed with SARS-CoV-2 tissue testing. JAAD Case Rep 2024; 43:57-59. [PMID: 38204882 PMCID: PMC10776372 DOI: 10.1016/j.jdcr.2023.11.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024] Open
Affiliation(s)
- Ahmed N. Ansari
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota
| | - Emma F. Johnson
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Katherine L. Wang
- Mayo Clinic Alix School of Medicine, Mayo Clinic, Jacksonville, Florida
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6
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Dehner CA, Johnson EF, Peters MS, Guo RR. Primary melanoma of the nipple: Report of 10 cases including coexistence with Paget's disease. Pathol Res Pract 2024; 253:155058. [PMID: 38181578 DOI: 10.1016/j.prp.2023.155058] [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: 11/19/2023] [Revised: 12/17/2023] [Accepted: 12/20/2023] [Indexed: 01/07/2024]
Abstract
Primary melanoma of the nipple (PMN) is exceedingly rare, with only single cases reported to date. We identified 10 patients with PMN: 5 females, 5 males, median age 55.5 years (range 29-66) at diagnosis of melanoma in situ (4 cases) or invasive melanoma (6 cases, Breslow depth 0.2 mm to 3.5 mm). Follow-up was available for all 10 patients (median 19 months, range 1-183). Nine patients had no evidence of disease; one patient died of disease (13.5 months) after presenting with a nodal metastasis. One case was exceptional, because the patient presented with a pigmented lesion that histopathologically exhibited co-existence of melanoma in situ and Paget disease, a challenging differential diagnosis due to immunohistochemical pitfalls in distinction between melanoma in situ and the pigmented variant of mammary Paget disease. Here we report the second largest series of PMN including a case of PMN colliding with mammary Paget disease, to raise awareness of these rare malignancies.
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Affiliation(s)
- Carina A Dehner
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA; Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, MN 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA
| | - Margot S Peters
- Department of Dermatology, Mayo Clinic, Rochester, MN 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA
| | - Ruifeng Ray Guo
- Department of Dermatology, Mayo Clinic, Rochester, MN 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA.
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7
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Dhami RK, Handfield C, Johnson EF, Tollefson MM. Idiopathic eruptive macular pigmentation in a pediatric patient and a review of the literature. Pediatr Dermatol 2023. [PMID: 38156740 DOI: 10.1111/pde.15496] [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: 07/28/2023] [Accepted: 12/02/2023] [Indexed: 01/03/2024]
Abstract
Idiopathic eruptive macular pigmentation (IEMP) is a rare, benign, self-resolving melanosis consisting of hyperpigmented macules typically on the face, trunk, and extremities that can occur in children and adolescents and often presents a diagnostic conundrum. We report a case involving an 8-year-old female whose previous clinical presentation was concerning for an atypical presentation of cutaneous mastocytosis or neurofibromatosis. The clinical and histopathologic evaluation was consistent with the diagnosis of IEMP, and no active intervention was pursued. Our accompanying literature review serves to better characterize this condition, highlight key diagnostic features, and emphasize the tendency for spontaneous resolution to avoid unnecessary treatments with limited clinical efficacy.
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Affiliation(s)
- Ramneek K Dhami
- Reno School of Medicine, University of Nevada, Reno, Nevada, USA
| | | | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Megha M Tollefson
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota, USA
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8
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Khodadadi RB, Yetmar ZA, Montagnon CM, Johnson EF, Abu Saleh OM. Majocchi's granuloma-A multicenter retrospective cohort study. JAAD Int 2023; 13:104-111. [PMID: 37744668 PMCID: PMC10517273 DOI: 10.1016/j.jdin.2023.08.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/16/2023] [Indexed: 09/26/2023] Open
Abstract
Background Majocchi's granuloma (MG) is an uncommon deep fungal folliculitis predominantly caused by dermatophytes. Given the rarity of this condition, available data regarding predisposing comorbidities/risk factors, clinical characteristics, offending microbiologic pathogens, diagnostics, pathologic findings, and treatment approaches has been inferred from historical cases. Objectives To review our institutional experience with MG. Methods We retrospectively analyzed a multicenter cohort of adult patients diagnosed with MG between 1992 and 2022. Results We analyzed 147 patients with MG, 105 of which were male with a median age of 55.6 years. Immunosuppressant and topical corticosteroid use were common prior to development of MG. Dermatologic lesions and their sites of involvement did not differ based on the immune status of patients. Trichophyton rubrum was the most common causative pathogen of MG, in addition to other dermatophytes. Treatment duration for all prescribed agents was median 31.5 days with oral terbinafine being the most frequently utilized agent. Clinical resolution was achieved in 96.6% of cases. Limitations Retrospective, nonrandomized study. Conclusions Although rare and clinically variable in presentation, diagnosis of MG often requires histopathologic confirmation to subsequently direct prolonged treatment with systemic antifungal therapy for mycological cure.
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Affiliation(s)
- Ryan B. Khodadadi
- Division of Public Health, Infectious Diseases, and Occupational Medicine, Mayo Clinic, Rochester, Minnesota
| | - Zachary A. Yetmar
- Division of Public Health, Infectious Diseases, and Occupational Medicine, Mayo Clinic, Rochester, Minnesota
| | | | - Emma F. Johnson
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Omar M. Abu Saleh
- Division of Public Health, Infectious Diseases, and Occupational Medicine, Mayo Clinic, Rochester, Minnesota
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9
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Yammine L, Picatoste B, Abdullah N, Leahey RA, Johnson EF, Gómez-Banoy N, Rosselot C, Wen J, Hossain T, Goncalves MD, Lo JC, Garcia-Ocaña A, McGraw TE. Spatiotemporal regulation of GIPR signaling impacts glucose homeostasis as revealed in studies of a common GIPR variant. Mol Metab 2023; 78:101831. [PMID: 37925022 PMCID: PMC10665708 DOI: 10.1016/j.molmet.2023.101831] [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: 06/13/2023] [Revised: 10/20/2023] [Accepted: 10/23/2023] [Indexed: 11/06/2023] Open
Abstract
OBJECTIVE Glucose-dependent insulinotropic polypeptide (GIP) has a role in controlling postprandial metabolic tone. In humans, a GIP receptor (GIPR) variant (Q354, rs1800437) is associated with a lower body mass index (BMI) and increased risk for Type 2 Diabetes. To better understand the impacts of GIPR-Q354 on metabolism, it is necessary to study it in an isogeneic background to the predominant GIPR isoform, E354. To accomplish this objective, we used CRISPR-CAS9 editing to generate mouse models of GIPR-Q354 and GIPR-E354. Here we characterize the metabolic effects of GIPR-Q354 variant in a mouse model (GIPR-Q350). METHODS We generated the GIPR-Q350 mice for in vivo studies of metabolic impact of the variant. We isolated pancreatic islets from GIPR-Q350 mice to study insulin secretion ex vivo. We used a β-cell cell line to understand the impact of the GIPR-Q354 variant on the receptor traffic. RESULTS We found that female GIPR-Q350 mice are leaner than littermate controls, and male GIPR-Q350 mice are resistant to diet-induced obesity, in line with the association of the variant with reduced BMI in humans. GIPR-Q350 mice of both sexes are more glucose tolerant and exhibit an increased sensitivity to GIP. Postprandial GIP levels are reduced in GIPR-Q350 mice, revealing feedback regulation that balances the increased sensitivity of GIP target tissues to secretion of GIP from intestinal endocrine cells. The increased GIP sensitivity is recapitulated ex vivo during glucose stimulated insulin secretion assays in islets. Generation of cAMP in islets downstream of GIPR activation is not affected by the Q354 substitution. However, post-activation traffic of GIPR-Q354 variant in β-cells is altered, characterized by enhanced intracellular dwell time and increased localization to the Trans-Golgi Network (TGN). CONCLUSIONS Our data link altered intracellular traffic of the GIPR-Q354 variant with GIP control of metabolism. We propose that this change in spatiotemporal signaling underlies the physiologic effects of GIPR-Q350/4 and GIPR-E350/4 in mice and humans. These findings contribute to a more complete understanding of the impact of GIPR-Q354 variant on glucose homeostasis that could perhaps be leveraged to enhance pharmacologic targeting of GIPR for the treatment of metabolic disease.
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Affiliation(s)
- Lucie Yammine
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - Belén Picatoste
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - Nazish Abdullah
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - Rosemary A Leahey
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - Emma F Johnson
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - Nicolás Gómez-Banoy
- Weill Center for Metabolic Health and Division of Cardiology, Department of Medicine, Weill Cornell Medicine, New York, NY, 10021, USA
| | - Carolina Rosselot
- Diabetes, Obesity, and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Jennifer Wen
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - Tahmina Hossain
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | | | - James C Lo
- Weill Center for Metabolic Health and Division of Cardiology, Department of Medicine, Weill Cornell Medicine, New York, NY, 10021, USA
| | - Adolfo Garcia-Ocaña
- Department of Molecular and Cellular Endocrinology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Timothy E McGraw
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA; Weill Center for Metabolic Health and Division of Cardiology, Department of Medicine, Weill Cornell Medicine, New York, NY, 10021, USA; Department of Cardiothoracic Surgery, Weill Cornell Medical College, New York, NY, 10065, USA.
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10
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Xie F, Agrawal S, Johnson EF, Wieland CN, Davis DMR, Theiler RN, Lehman JS. Updates on the dermatopathology of pregnancy-associated skin conditions. Hum Pathol 2023; 140:173-195. [PMID: 37209919 DOI: 10.1016/j.humpath.2023.05.005] [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: 03/05/2023] [Accepted: 05/15/2023] [Indexed: 05/22/2023]
Abstract
Pathologists provide valuable input in the dermatological care of pregnant patients in various contexts. This article provides dermatopathology updates on cutaneous changes associated with pregnancy, organized based on the following classification system: physiological skin changes in pregnancy, specific dermatoses of pregnancy, dermatoses modified in pregnancy, and skin neoplasms in pregnancy. Awareness of the impact of pregnancy on the skin by pathologists is important, as this is an opportunity to contribute to diagnostic precision in this patient population.
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Affiliation(s)
- Fangyi Xie
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Shruti Agrawal
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Carilyn N Wieland
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Dawn Marie R Davis
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, MN, 55905, USA
| | - Regan N Theiler
- Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Julia S Lehman
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA.
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11
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Xie F, Davis DMR, Baban F, Johnson EF, Theiler RN, Todd A, Pruneddu S, Murase JE, Maul JT, Ambros-Rudolph CM, Lehman JS. Use of a pregnancy dermatology clinical scoring system to differentiate between pemphigoid gestationis and polymorphic eruption of pregnancy: practical considerations for the obstetrician. Am J Obstet Gynecol MFM 2023; 5:101078. [PMID: 37399893 DOI: 10.1016/j.ajogmf.2023.101078] [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] [Received: 04/27/2023] [Accepted: 06/19/2023] [Indexed: 07/05/2023]
Affiliation(s)
- Fangyi Xie
- Department of Dermatology, Mayo Clinic, Rochester, MN; Department of Dermatology, Royal Devon and Exeter NHS Foundation Trust, Exeter, United Kingdom
| | - Dawn Marie R Davis
- Departments of Dermatology and Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, MN
| | - Farah Baban
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
| | - Emma F Johnson
- Departments of Dermatology and Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
| | - Regan N Theiler
- Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, MN
| | - Austin Todd
- Department of Biostatistics, Mayo Clinic, Rochester, MN
| | - Sara Pruneddu
- Department of Dermatology, King's College Hospital, London, United Kingdom
| | - Jenny E Murase
- Department of Dermatology, University of California San Francisco, San Francisco, CA
| | - Julia-Tatjana Maul
- Department of Dermatology, University Hospital Zurich, Zurich, Switzerland; Faculty of Medicine, University of Zurich, Zurich, Switzerland
| | | | - Julia S Lehman
- Departments of Dermatology and Laboratory Medicine and Pathology, Mayo Clinic, 200 1st St. SW, Rochester, MN 55905.
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12
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Xie F, Davis DMR, Baban F, Johnson EF, Theiler RN, Todd A, Pruneddu S, Murase JE, Maul JT, Ambros-Rudolph CM, Lehman JS. Development and multicenter international validation of a diagnostic tool to differentiate between pemphigoid gestationis and polymorphic eruption of pregnancy. J Am Acad Dermatol 2023; 89:106-113. [PMID: 36739091 DOI: 10.1016/j.jaad.2023.01.027] [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] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/03/2023] [Accepted: 01/20/2023] [Indexed: 02/05/2023]
Abstract
BACKGROUND Pemphigoid gestationis (PG) and polymorphic eruption of pregnancy (PEP) may be similar morphologically but confer different maternal and fetal risks. Direct immunofluorescence is the gold standard test used to differentiate between the 2 diagnoses but is not always available. OBJECTIVE To develop and validate a clinical scoring system to differentiate PG from PEP. METHODS After developing a scoring system based on differentiating clinical factors reported in existing literature, we tested its diagnostic accuracy in a retrospective international multicenter validation study in collaboration with the European Academy of Dermatology and Venereology's Skin Diseases in Pregnancy Taskforce. RESULTS Nineteen pregnancies (16 patients) affected by PG and 39 pregnancies (39 patients) affected by PEP met inclusion criteria. PG had a mean score of 4.6 (SD, 2.5) and PEP had a mean score of -0.3 (SD, 2.0). The area under the curve was 0.93 (95% CI, 0.86-1.00). Univariate analysis revealed that almost all criteria used in the scoring system were significantly different between the groups (P < .05), except for skip pregnancy and multiple gestations, which were then removed from the final scoring system. LIMITATIONS Small retrospective study. CONCLUSION The Pregnancy Dermatoses Clinical Scoring System may be useful to differentiate PG from PEP in resource-limited settings.
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Affiliation(s)
- Fangyi Xie
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota; Department of Dermatology, Royal Devon and Exeter NHS Foundation Trust, Exeter, UK
| | - Dawn Marie R Davis
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota; Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota
| | - Farah Baban
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Regan N Theiler
- Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, Minnesota
| | - Austin Todd
- Department of Biostatistics, Mayo Clinic, Rochester, Minnesota
| | - Sara Pruneddu
- Department of Dermatology, King's College Hospital, London, UK
| | - Jenny E Murase
- Department of Dermatology, University of California San Francisco, California
| | - Julia-Tatjana Maul
- Department of Dermatology, University Hospital Zurich, Zurich, Switzerland; Faculty of Medicine, University of Zurich, Zurich, Switzerland
| | | | - Julia S Lehman
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota.
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13
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Meves A, Todd A, Johnson EF. Tumor width and calculated tumor area do not outperform Breslow thickness in predicting sentinel lymph node biopsy positivity. J Am Acad Dermatol 2023; 89:188-190. [PMID: 36948300 PMCID: PMC10330270 DOI: 10.1016/j.jaad.2023.03.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/09/2023] [Accepted: 03/09/2023] [Indexed: 03/24/2023]
Affiliation(s)
- Alexander Meves
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota
| | - Austin Todd
- Department of Biostatistics, Mayo Clinic, Rochester, Minnesota
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota.
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14
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Xie F, Johnson EF, Wetter DA, Camilleri MJ, Todd A, Lehman JS. Histopathologic features predictive of perivascular deposition of IgA on direct immunofluorescence in cases of leukocytoclastic vasculitis: A retrospective study of 112 specimens. J Cutan Pathol 2023. [PMID: 37150810 DOI: 10.1111/cup.14436] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 03/13/2023] [Accepted: 03/27/2023] [Indexed: 05/09/2023]
Abstract
IgA vasculitis is a small-vessel vasculitis subtype with increased risk of systemic involvement. We aimed to investigate if any light-microscopic features can predict the presence of perivascular granular IgA deposits on direct immunofluorescence (DIF) microscopy. We performed a retrospective search of cutaneous pathology reports from our internal and consultation practice (January 1, 2010-October 5, 2021) with a diagnosis of leukocytoclastic vasculitis and accompanying DIF. A blinded dermatopathologist reviewed standard microscopy slides for predetermined histopathological features. Fifty-six biopsies (48 patients) and 56 biopsies (42 patients) met inclusion criteria for IgA+ and IgA-, respectively. The presence of eosinophils and mid and deep dermal inflammation were statistically more associated with IgA- (41/56 [73.2%] and 31/56 [55.4%], respectively) than IgA+ cases (28/56 [50.0%] and 14/56 [25.0%]; p = 0.049 and 0.006, respectively, chi-squared test). Other microscopic criteria recorded were not significantly different between the two groups (p > 0.05, chi-squared and Fisher's exact tests). In this retrospective study of 112 cases, we found that while the absence of eosinophils and absence of mid- and deep inflammation were correlated with increased likelihood of IgA perivascular deposition on DIF, no other histopathological features on light microscopy tested could reliably predict the presence of IgA perivascular deposition on DIF. Therefore, DIF remains a necessary component for the accurate diagnosis of cutaneous IgA vasculitis.
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Affiliation(s)
- Fangyi Xie
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - David A Wetter
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Michael J Camilleri
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Austin Todd
- Department of Biostatistics, Mayo Clinic, Rochester, Minnesota, USA
| | - Julia S Lehman
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
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15
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Baban F, Xie F, Lehman JS, Theiler R, Todd A, Davis DM, Johnson EF. Histopathological features of pemphigoid gestationis and polymorphic eruption of pregnancy: A blinded retrospective comparative study of 31 cases. J Cutan Pathol 2023; 50:358-363. [PMID: 36357351 DOI: 10.1111/cup.14358] [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] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 09/17/2022] [Accepted: 11/06/2022] [Indexed: 11/12/2022]
Abstract
BACKGROUND Pemphigoid gestationis (PG) and polymorphic eruption of pregnancy (PEP) are pregnancy-related dermatoses. Definitive diagnosis often relies upon histopathology and direct immunofluorescence (DIF). PG is associated with fetal and neonatal risks, while PEP confers minimal risk. OBJECTIVE We aimed to compare histopathologic features to determine key differentiators. METHODS A retrospective cohort study of PG and PEP cases, with accompanying DIF, conducted from 1995 to 2020. Skin biopsies were examined independently in a blinded fashion by two dermatopathologists for a list of histopathological features. RESULTS Twenty-one cases of PG and 10 cases of PEP were identified. PG had significantly denser eosinophils than PEP (mean 155 vs. 48 cells/5 hpf; p < 0.018). PG was also noted to have eosinophilic spongiosis and eosinophils at the dermal-epidermal junction more frequently compared to PEP (80% PG vs. 10% PEP; p < 0.001). A mean cutoff value of 86 eosinophils and a mean optimal sensitivity and specificity of 81% and 83%, respectively, for eosinophils density's diagnostic power of PEP versus PG were achieved. Subepithelial separation was exclusively seen in PG (40% vs. 0%; p < 0.007). CONCLUSION Eosinophilic spongiosis, eosinophilic epitheliotropism, and dense superficial dermal eosinophils were diagnostic of PG. Given overlapping clinicopathologic features, however, DIF results with clinicopathologic correlation, remain the gold standard.
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Affiliation(s)
- Farah Baban
- Division of Anatomic and Clinical Pathology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Fangyi Xie
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Julia S Lehman
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Regan Theiler
- Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, Minnesota, USA
| | - Austin Todd
- Department of Biostatistics, Mayo Clinic, Rochester, Minnesota, USA
| | - Dawn M Davis
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Emma F Johnson
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
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16
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Jin MF, Ali NS, Davis DMR, Johnson EF, Gibson LE. An update on long-term outcomes of pediatric follicular mucinosis over a 20-year period: a retrospective cohort study. Int J Dermatol 2023. [PMID: 36919978 DOI: 10.1111/ijd.16639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 01/13/2023] [Accepted: 02/21/2023] [Indexed: 03/16/2023]
Abstract
BACKGROUND Follicular mucinosis (FM) is a rare disease characterized by mucin accumulation in the follicular unit. FM's etiology is still widely debated since its first description in 1957. Follicular mucinosis is usually reported to be benign in children, although reports of malignant transformation, most commonly mycosis fungoides, exist. The present project aims to demonstrate that children with a diagnosis of follicular mucinosis have positive long-term outcomes and do not develop mycosis fungoides. MATERIALS AND METHODS This is a retrospective cohort study where patients with a diagnosis of follicular mucinosis ages 22 years and below were identified. Data surrounding the patient's diagnosis of FM, differential diagnosis, treatments, and long-term outcomes were collected. Patients who were lost to follow-up were contacted by phone for an update on the status of their skin and overall health. RESULTS Out of 14 patients with follow-up information, none developed subsequent mycosis fungoides or other hematologic malignancies. CONCLUSION Pediatric patients with follicular mucinosis will likely present with limited disease and not experience malignant transformation.
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Affiliation(s)
- Mauricio F Jin
- Mayo Clinic, Alix School of Medicine, Rochester, MN, USA
| | - Nora S Ali
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - Dawn M R Davis
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA.,Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, MN, USA
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Lawrence E Gibson
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
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17
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Blum FR, Miles JA, Farag SW, Johnson EF, Davis M, Hamzavi IH, Lyons AB, Sayed CJ, Googe PB. Characterizing the immune checkpoint marker profiles of cutaneous squamous cell carcinomas in patients with hidradenitis suppurativa. J Eur Acad Dermatol Venereol 2023; 37:e316-e318. [PMID: 36151986 DOI: 10.1111/jdv.18598] [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] [Received: 06/05/2022] [Accepted: 09/14/2022] [Indexed: 11/28/2022]
Affiliation(s)
- Franklin R Blum
- UNC Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
| | - J Alex Miles
- Department of Dermatology, UNC Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
| | - Sherif W Farag
- UNC Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina, USA
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Mark Davis
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Iltefat H Hamzavi
- Henry Ford Hospital, Department of Dermatology, Detroit, Michigan, USA
| | - Alexis B Lyons
- Henry Ford Hospital, Department of Dermatology, Detroit, Michigan, USA
| | - Christopher J Sayed
- Department of Dermatology, UNC Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
| | - Paul B Googe
- Department of Dermatology, UNC Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA.,UNC Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina, USA.,UNC Department of Pathology and Laboratory Medicine, Chapel Hill, North Carolina, USA
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18
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Xie F, Johnson EF, Youssef MJ. Thyroid Dermopathy and Acropachy. Mayo Clin Proc 2022; 97:2314-2315. [PMID: 36464464 DOI: 10.1016/j.mayocp.2022.08.001] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 07/31/2022] [Accepted: 08/05/2022] [Indexed: 12/03/2022]
Affiliation(s)
- Fangyi Xie
- Department of Dermatology, Mayo Clinic, Rochester, MN
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, MN; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
| | - Molly J Youssef
- Department of Dermatology, Mayo Clinic, Rochester, MN; Department of Pediatrics, Mayo Clinic, Rochester, MN.
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19
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Xie F, Johnson EF, Cantwell HM. Disseminated Bullous Impetigo in an Adult With Atopic Dermatitis Flare. Mayo Clin Proc 2022; 97:2097-2098. [PMID: 36333016 DOI: 10.1016/j.mayocp.2022.06.028] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 06/21/2022] [Accepted: 06/27/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Fangyi Xie
- Department of Dermatology, Mayo Clinic, Rochester, MN
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, MN; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
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20
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Xie F, Baban F, Johnson EF. 33841 Pregnancy dermatosis clinical scoring system: How to predict between pemphigoid gestationis and polymorphic eruption of pregnancy. J Am Acad Dermatol 2022. [DOI: 10.1016/j.jaad.2022.06.413] [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: 11/28/2022]
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21
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Abstract
Psoriasiform dermatoses represent a wide array of skin diseases commonly encountered by clinicians and pathologists. While they may present a diagnostic challenge, thorough observation coupled with proper interpretation of subtle additional clinical or histopathologic features provide clues to the correct diagnosis. In this review, we provide updates on emerging entities and develop a systemic approach to establish the pathologic diagnosis, with emphasis on the importance of clinicopathologic correlation.
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Affiliation(s)
- Hadir Shakshouk
- Departments of Dermatology
- Department of Dermatology, Alexandria University, Alexandria, Egypt
| | - Lori A Erickson
- Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
| | - Emma F Johnson
- Departments of Dermatology
- Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
| | - Julia S Lehman
- Departments of Dermatology
- Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
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22
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Anand NC, Takaichi M, Johnson EF, Wetter DA, Davis MDP, Alavi A. Suggestions for a New Clinical Classification Approach to Panniculitis Based on a Mayo Clinic Experience of 207 Cases. Am J Clin Dermatol 2022; 23:739-746. [PMID: 35849324 DOI: 10.1007/s40257-022-00709-9] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/08/2022] [Indexed: 11/26/2022]
Abstract
BACKGROUND Panniculitis, or inflammation of adipose tissue, includes a heterogeneous group of disorders with similar morphologic presentations. Currently, panniculitides are classified based on histopathologic findings only. OBJECTIVE In this retrospective study of 207 cases of biopsy-proven panniculitis over 20 years at Mayo Clinic, we aimed to propose a new classification that integrates the clinical morphologic features with the histopathology of panniculitis. METHODS We collected patient demographic and lesion morphologic characteristics using lesion photographs and physician notes for each of our 207 cases, including location, ulceration, scale, pattern (unilateral versus circumferential), atrophy/sclerosis (cicatricial), redness, and swelling. RESULTS The panniculitides most likely to ulcerate were calciphylaxis (85.7% ulcerating), pancreatic panniculitis (66.6%), and α1-antitrypsin deficiency-associated panniculitis (100%). The panniculitides least likely to ulcerate were erythema nodosum and medication-induced and granulomatous panniculitis. This retrospective study used only descriptions in clinical notes and available medical photographs. CONCLUSION We present an updated classification schema of panniculitides based on clinical findings. The primary distinctions are based on ulceration, location, and number of lesions. Although complete distinction of all panniculitides based on clinical examination alone is not possible, we hope the proposed schema allows clinicians to tailor differential diagnoses.
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Affiliation(s)
| | | | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA
| | - David A Wetter
- Department of Dermatology, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA
| | - Mark D P Davis
- Department of Dermatology, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA
| | - Afsaneh Alavi
- Department of Dermatology, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA.
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23
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Tekin B, Johnson EF, Wieland CN, Gibson LE, Camilleri MJ, Kalaaji AN, Comfere NI, Peters MS, Lehman JS. Histopathology of autoimmune bullous dermatoses: What's new? Hum Pathol 2022; 128:69-89. [PMID: 35764145 DOI: 10.1016/j.humpath.2022.06.021] [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: 04/14/2022] [Revised: 06/19/2022] [Accepted: 06/21/2022] [Indexed: 11/25/2022]
Abstract
Autoimmune bullous dermatoses are characterized by the presence of tissue-bound and often circulating pathogenic autoantibodies targeting structural components of the skin and/or mucous membranes. The diagnostic workup for this heterogeneous group of disorders consists of a multi-step process, of which the light microscopic examination is a crucial component. This review is organized following a classification scheme that is based on two main histopathologic features, namely level of intraepithelial split and composition of the inflammatory infiltrate. Overall, we aim to place emphasis on the histopathologic clues that can assist pathologists in differential diagnosis and review the updates in the literature.
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Affiliation(s)
- Burak Tekin
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Emma F Johnson
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - Carilyn N Wieland
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - Lawrence E Gibson
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - Michael J Camilleri
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - Amer N Kalaaji
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - Nneka I Comfere
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - Margot S Peters
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - Julia S Lehman
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Department of Dermatology, Mayo Clinic, Rochester, MN, USA.
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24
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Lehman JS, Johnson EF, Camilleri MJ, Gibson LE, Comfere NI, Kalaaji AN, Peters MS, Cervenka DJ, Doppler JM, Lange CR, Miller CJ, Wieland CN. Impact of adding an IgG4 conjugate to routine direct immunofluorescence testing for subepithelial and intraepithelial autoimmune blistering disorders. J Cutan Pathol 2021; 49:358-362. [PMID: 34820877 DOI: 10.1111/cup.14176] [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: 03/19/2021] [Revised: 10/14/2021] [Accepted: 10/31/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND Certain autoimmune bullous dermatoses are mediated by autoantibodies of the IgG4 subclass. We determined the diagnostic impact of adding IgG4 to our conventional direct immunofluorescence (DIF) panel. METHODS For all cases submitted to our referral laboratory for DIF over 1 month (n = 630), we performed IgG4 testing and collected consecutive biopsy specimens showing definite or indeterminate linear or cell-surface deposition of IgG, IgG4, and/or C3. On retrospective blinded review, we classified the pattern and whether the findings were definite, indeterminate, or negative. When present, substantial background staining was recorded. RESULTS Seventy DIF specimens met the inclusion criteria. Of 22 (31.4%) specimens equivocal for linear or cell-surface deposition, 9 (40.9%) had definitive IgG4 findings, either linear (3 of 14 equivocal linear cases; 21.4%) or cell-surface (6 of 8 equivocal cell-surface cases; 75.0%). Background deposition was substantial in 14 cases (20.0%) for IgG but in none for C3 or IgG4. CONCLUSION IgG4 allowed the classification of over 40% of DIF cases that were otherwise equivocal by IgG and C3. IgG4 staining showed lower levels of non-specific background staining than IgG or C3. IgG4 appears to contribute most value in cases with cell-surface deposition or with equivocal linear IgG deposition and negative C3 results.
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Affiliation(s)
- Julia S Lehman
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Emma F Johnson
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Michael J Camilleri
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Lawrence E Gibson
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Nneka I Comfere
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Amer N Kalaaji
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Margot S Peters
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Derek J Cervenka
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Joseph M Doppler
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Colleen R Lange
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Cameron J Miller
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Carilyn N Wieland
- Mayo Clinic Immunodermatology Laboratory, Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
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25
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Shakshouk H, Johnson EF, Peters MS, Wieland CN, Comfere NI, Lehman JS. Cutaneous eccrine inflammation and necrosis: review of inflammatory disorders affecting the eccrine apparatus including new associations. Hum Pathol 2021; 118:71-85. [PMID: 34450084 DOI: 10.1016/j.humpath.2021.08.005] [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: 04/30/2021] [Revised: 07/30/2021] [Accepted: 08/06/2021] [Indexed: 11/18/2022]
Abstract
Despite being frequently overlooked during the examination of histopathological sections, eccrine sweat glands can offer clues for diagnosing various skin conditions. They provide important functions and can lead to several diseases when inflamed or injured. This review article provides information regarding eccrine physiology as well as well-established and novel entities that occur in association with eccrine gland pathology.
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Affiliation(s)
- Hadir Shakshouk
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Dermatology, Andrology and Venereology, Alexandria University, Alexandria, 21131, Egypt
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Margot S Peters
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Carilyn N Wieland
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Nneka I Comfere
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Julia S Lehman
- Department of Dermatology, Mayo Clinic, Rochester, MN, 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA.
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26
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Zhou MX, Johnson EF, Arce K, Gruwell SF. Teledentistry in the management of a non-Hodgkin's lymphoma manifesting as a gingival swelling: A case report. Spec Care Dentist 2021; 42:86-90. [PMID: 34329504 DOI: 10.1111/scd.12638] [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: 05/28/2021] [Revised: 07/08/2021] [Accepted: 07/16/2021] [Indexed: 11/27/2022]
Abstract
Oral cavity lymphomas constitute only 3% of all lymphomas in the general population but are the third most common oral malignancy. A 67-year-old female with a history of osteoporosis, Graves' disease and non-Hodgkin's lymphoma was referred to the Department of Dental Specialties with a chief complaint of persistent soft tissue swelling facial to the maxillary incisors of possible non-odontogenic origin. To expedite care, the patient was first seen via teledentistry and subsequently appointed for an in-person evaluation and treatment. Examination revealed 1-3 mm probing depths and a firm, non-tender, non-fluctuant mass in the facial soft tissues approximating teeth nos. 7-10. Biopsy of the affected area was performed. A diagnosis of recurrent follicle center cell lymphoma, a form of non-Hodgkin's lymphoma, was rendered. The patient was subsequently referred to the Oncology and Hematology team, followed for 6 weeks and remained symptom-free. This case underlies the importance of teledentistry to expedite care and manage patient expectations. Additionally, it also underscores the importance of microscopic examination of tissue samples from oral lesions that appear non-odontogenic in nature and reinforces the role of dentistry in uncovering the oral-systemic link.
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Affiliation(s)
- Miao Xian Zhou
- Department of Dental Specialties, Mayo Clinic, Rochester, Minnesota, USA
| | - Emma F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, Minnesota, USA
| | - Kevin Arce
- Department of Oral and Maxillofacial Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Scott F Gruwell
- Department of Dental Specialties, Mayo Clinic, Rochester, Minnesota, USA
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27
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Picatoste B, Yammine L, Leahey RA, Soares D, Johnson EF, Cohen P, McGraw TE. Defective insulin-stimulated GLUT4 translocation in brown adipocytes induces systemic glucose homeostasis dysregulation independent of thermogenesis in female mice. Mol Metab 2021; 53:101305. [PMID: 34303022 PMCID: PMC8363886 DOI: 10.1016/j.molmet.2021.101305] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 06/24/2021] [Accepted: 07/14/2021] [Indexed: 01/02/2023] Open
Abstract
OBJECTIVE Recent studies indicate that brown adipose tissue, in addition to its role in thermogenesis, has a role in the regulation of whole-body metabolism. Here we characterize the metabolic effects of deleting Rab10, a protein key for insulin stimulation of glucose uptake into white adipocytes, solely from brown adipocytes. METHODS We used a murine brown adipocyte cell line and stromal vascular fraction-derived in vitro differentiated brown adipocytes to study the role of Rab10 in insulin-stimulated GLUT4 translocation to the plasma membrane and insulin-stimulated glucose uptake. We generated a brown adipocyte-specific Rab10 knockout for in vivo studies of metabolism and thermoregulation. RESULTS We demonstrate that deletion of Rab10 from brown adipocytes results in a two-fold reduction of insulin-stimulated glucose transport by reducing translocation of the GLUT4 glucose transporter to the plasma membrane, an effect linked to whole-body glucose intolerance and insulin resistance in female mice. This effect on metabolism is independent of the thermogenic function of brown adipocytes, thereby revealing a metabolism-specific role for brown adipocytes in female mice. The reduced glucose uptake induced by Rab10 deletion disrupts ChREBP regulation of de novo lipogenesis (DNL) genes, providing a potential link between DNL in brown adipocytes and whole-body metabolic regulation in female mice. However, deletion of Rab10 from male mice does not induce systemic insulin resistance, although ChREBP regulation is disrupted. CONCLUSIONS Our studies of Rab10 reveal the role of insulin-regulated glucose transport into brown adipocytes in whole-body metabolic homeostasis of female mice. Importantly, the contribution of brown adipocytes to whole-body metabolic regulation is independent of its role in thermogenesis. It is unclear whether the whole-body metabolic sexual dimorphism is because female mice are permissive to the effects of Rab10 deletion from brown adipocytes or because male mice are resistant to the effect.
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Affiliation(s)
- Belén Picatoste
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - Lucie Yammine
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - Rosemary A. Leahey
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - David Soares
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - Emma F. Johnson
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA
| | - Paul Cohen
- Laboratory of Molecular Metabolism, The Rockefeller University, New York, NY, 10065, USA
| | - Timothy E. McGraw
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA,Department of Cardiothoracic Surgery, Weill Cornell Medical College, New York, NY, 10065, USA,Corresponding author. Department of Biochemistry, Weill Cornell Medical College, New York, NY, 10065, USA.
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Johnson EF, Kelley BF, Gibson LE. Intravascular histiocytosis: mimicker of cellulitis, angiosarcoma, inflammatory breast cancer, and others. Int J Dermatol 2021; 61:306-309. [PMID: 34057196 DOI: 10.1111/ijd.15670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 04/12/2021] [Accepted: 04/21/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Intravascular histiocytosis is an underrecognized reactive skin condition characterized by the clinical finding of poorly demarcated erythematous to violaceous patches and plaques. The diagnosis is confirmed by the histologic findings of intraluminal histiocytes on skin biopsy and exclusion of an alternative diagnosis. METHODS A review of patients with a histologic diagnosis of intravascular or intralymphatic histiocytosis and seen at Mayo Clinic, Rochester, Minnesota, from January 1, 2010, to October 10, 2020, was performed. Histologic and clinical information was collected from the medical records. RESULTS Nine patients were identified. Clinical impressions prior to biopsy varied widely, and no clinician included intravascular histiocytosis in the initial clinical differential diagnosis. Eight patients had preceding trauma to the affected area. CONCLUSION Intravascular histiocytosis remains a rare skin condition. Clinical identification remains low. Our cases add support to the hypothesis that intravascular histiocytosis is a reactive condition often preceded by trauma and/or surgery.
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Shamim H, Johnson EF, Gibson LE, Comfere N. Mycosis fungoides with spongiosis: A potential diagnostic pitfall. J Cutan Pathol 2019; 46:645-652. [DOI: 10.1111/cup.13477] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 04/04/2019] [Accepted: 04/09/2019] [Indexed: 12/17/2022]
Affiliation(s)
- Huma Shamim
- Department of DermatologyMayo Clinic Rochester Rochester Minnesota
| | - Emma F. Johnson
- Department of DermatologyMayo Clinic Rochester Rochester Minnesota
| | - Lawrence E. Gibson
- Department of DermatologyMayo Clinic Rochester Rochester Minnesota
- Department of Laboratory Medicine and PathologyMayo Clinic Rochester Rochester Minnesota
| | - Nneka Comfere
- Department of DermatologyMayo Clinic Rochester Rochester Minnesota
- Department of Laboratory Medicine and PathologyMayo Clinic Rochester Rochester Minnesota
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Johnson EF, Tolkachjov SN, Gibson LE. Alpha-1 antitrypsin deficiency panniculitis: clinical and pathologic characteristics of 10 cases. Int J Dermatol 2018; 57:952-958. [DOI: 10.1111/ijd.14012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 03/14/2018] [Accepted: 04/02/2018] [Indexed: 12/19/2022]
Affiliation(s)
| | | | - Lawrence E. Gibson
- Department of Dermatology; Mayo Clinic; Rochester MN USA
- Division of Dermatopathology; Mayo Clinic; Rochester MN USA
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Johnson EF, Wetter DA, Lehman JS, Hand JL, Davis DMR, Tollefson MM. Leukocytoclastic vasculitis in children: clinical characteristics, subtypes, causes and direct immunofluorescence findings of 56 biopsy-confirmed cases. J Eur Acad Dermatol Venereol 2016; 31:544-549. [PMID: 27580419 DOI: 10.1111/jdv.13952] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 08/11/2016] [Indexed: 11/28/2022]
Abstract
BACKGROUND Leukocytoclastic vasculitis (LCV) in children is a complex group of conditions. OBJECTIVES This study presents the demographics, clinical features, direct immunofluorescence (DIF) results and suspected aetiologies of 56 biopsy-confirmed cases of leukocytoclastic vasculitis in children. METHODS Retrospective review of 56 children seen at Mayo Clinic in Rochester, Minnesota, from 1993 to 2013 with clinical features and cutaneous biopsy consistent with LCV. RESULTS Twenty-seven (48%) cases were found to be due to IgA vasculitis (Henoch-Schonlein purpura). The remaining cases were found to be due to cutaneous small-vessel vasculitis (n = 19, 34%), urticarial vasculitis (n = 5, 9%), ANCA-associated vasculitis (n = 4, 7%) and acute haemorrhagic oedema of infancy (n = 1, 2%). IgA vasculitis was found to be associated with abdominal pain (P = 0.008), whereas the non-IgA vasculitis group was associated with headache (P = 0.052). Children with IgA vasculitis had palpable purpura (P = <0.001), petechia (P = 0.057), vesicles (P = 0.009) and involvement of the buttock (P = 0.004) more frequently than the non-IgA vasculitis group. On DIF, perivascular IgA was positive in IgA vasculitis compared to non-IgA vasculitis cases (P = <0.001), the other conjugates were similar between the two groups. CONCLUSION The most common subtype of biopsy-confirmed LCV in children is IgA vasculitis. Clinical features, exam characteristics and DIF results can be helpful in determining the subtype of cutaneous vasculitis in children.
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Affiliation(s)
- E F Johnson
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - D A Wetter
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA
| | - J S Lehman
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - J L Hand
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA.,Department of Pediatrics, Mayo Clinic, Rochester, MN, USA.,Department of Medical Genetics, Mayo Clinic, Rochester, MN, USA
| | - D M R Davis
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA.,Department of Pediatrics, Mayo Clinic, Rochester, MN, USA
| | - M M Tollefson
- Department of Dermatology, Mayo Clinic, Rochester, MN, USA.,Department of Pediatrics, Mayo Clinic, Rochester, MN, USA
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Johnson EF, Hawkins DM, Gifford LK, Smidt AC. Recurrent Oral and Genital Ulcers in an Infant: Neonatal Presentation of Pediatric Behçet Disease. Pediatr Dermatol 2015; 32:714-7. [PMID: 25639516 DOI: 10.1111/pde.12512] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Behçet disease is a complex, multisystem disease characterized by recurrent oral and genital ulcerations. It rarely occurs in infants or children. Neonatal Behçet disease has been reported in infants whose ulcers resolve at or before 9 weeks of age. Few cases of neonatal Behçet disease persisting into childhood have previously been reported. We report the case of a 1-month-old infant who presented with severe recurrent genital ulcerations and at 6 months developed recurrent oral ulcerations. Her orogenital ulcerations continue to recur. Human leukocyte antigen testing revealed HLA-B51 and B44 positivity. This is a case of pediatric Behçet disease in the neonatal period. Behçet disease should be considered in the differential diagnosis of recurrent genital and oral ulcerations in infants and children.
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Affiliation(s)
- Emma F Johnson
- University of New Mexico, School of Medicine, Albuquerque, New Mexico
| | - Danielle M Hawkins
- Department of Dermatology, University of New Mexico School of Medicine, Albuquerque, New Mexico
| | - Laura K Gifford
- Department of Dermatology, University of New Mexico School of Medicine, Albuquerque, New Mexico
| | - Aimee C Smidt
- Department of Dermatology, University of New Mexico School of Medicine, Albuquerque, New Mexico.,Department of Pediatrics, University of New Mexico School of Medicine, Albuquerque, New Mexico
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Affiliation(s)
- Emma F Johnson
- University of New Mexico, School of Medicine, University of New Mexico, Albuquerque, New Mexico
| | - Aimee C Smidt
- Departments of Dermatology and of Pediatrics, University of New Mexico, Albuquerque, New Mexico
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Affiliation(s)
- Emma F Johnson
- Department of Dermatology, University of New Mexico School of Medicine, Albuquerque
| | - Michaela H Jacobs
- Department of Dermatology, University of New Mexico School of Medicine, Albuquerque
| | - Aimee C Smidt
- Departments of Dermatology and Pediatrics, University of New Mexico School of Medicine, Albuquerque
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Pierce Jr. JR, Shirley M, Johnson EF, Kang H. Narcotic administration and fall-related injury in the hospital: Implications for patient safety programs and providers. International Journal of Risk & Safety in Medicine 2013; 25:229-34. [DOI: 10.3233/jrs-130603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- J. Rush Pierce Jr.
- Department of Internal Medicine, Division of Hospital Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA
| | - Michael Shirley
- Department of Internal Medicine, Division of Hospital Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA
| | - Emma F. Johnson
- Department of Internal Medicine, Division of Hospital Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA
| | - Huining Kang
- Department of Internal Medicine, Division of Epidemiology, University of New Mexico School of Medicine, Albuquerque, NM, USA
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Sugimura T, Obermayer-Straub P, Kayser A, Braun S, Loges S, Alex B, Lüttig B, Johnson EF, Manns MP, Strassburg CP. A major CYP2D6 autoepitope in autoimmune hepatitis type 2 and chronic hepatitis C is a three-dimensional structure homologous to other cytochrome P450 autoantigens. Autoimmunity 2002; 35:501-13. [PMID: 12765476 DOI: 10.1080/0891693021000069556] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [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: 12/12/2022]
Abstract
Liver-kidney microsomal antibodies type 1 (LKM) are a diagnostic marker for autoimmune hepatitis type 2 (AIH-2), however, LKM autoantibodies are also detected in a small percentage of patients with chronic hepatitis C. The major target of LKM antibodies as evidenced by indirect immunofluorescence is cytochrome P4502D6 (CYP2D6). Anti-CYP2D6 titers of 62 LKM positive sera, 196 sera of patients with hepatic and rheumatic diseases and 33 sera of healthy blood donors (BD) were determined by an in vitro transcription/in vitro translation assay (ITT). Twenty five out of 26 AIH-2 sera and 33/36 LKM positive hepatitis C virus (HCV) sera were anti-CYP2D6 positive by ITT and antibody titers were similar in both patient groups. Epitope mapping experiments were performed by a series of truncated CYP2D6 proteins and by single epitopes of 257-269, 321-351, 373-389 and 410-419 amino acid (aa) expressed as DHFR-fusion proteins in Escherichia coli. The major linear epitope consists of 257-269 aa. This epitope is recognized with a significantly higher prevalence (64%) in AIH-2 than in LKM sera from patients with chronic hepatitis C (24%) (p < 0.001). None of the other autoepitopes showed significant differences in the prevalence of recognition by sera from both patient groups. Minor binding sites consisted of 321-351 aa, which was recognized by less than 20% of LKM sera and in the C-terminal region of 350-494 aa, which was recognized by less than 5% of LKM sera Our study revealed an epitope of 321-379 an on CYP2D6, which was shown to be conformation dependent. It was recognized by the vast majority of LKM sera, specifically by 76% of sera from HCV positive LKM patients and also by 76% of sera from patients with AIH-2. This epitope is homologous to three-dimensional epitopes detected by autoantibodies directed against hepatic cytochromes P450s in drug induced hepatitis and to an autoepitope on CYP21B associated with adrenal failure.
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Affiliation(s)
- T Sugimura
- Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Carl-Neubergstr 1, 30625 Hannover, Germany
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Sechenykh AA, Dubanov AV, Skvortsov VS, Ivanov AS, Archakov AI, Williams P, Cosme J, Johnson EF, McRee DE. [Computer model of 3D structure of cytochrome P450 2B4]. Vopr Med Khim 2002; 48:526-38. [PMID: 12498097] [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: 02/28/2023]
Abstract
Cytochromes P450 (CYPs) play an important role in the oxidative metabolism of xenobiotics. Three-dimensional structures of CYPs are needed to study structure-function relationships in their molecules and interaction with partner proteins. Experimental determination of eucaryotic CYPs 3D structures is difficult because of hydrophobic membrane anchors and surface hydrophobic regions that prevent their crystallization. Replacement of surface hydrophobic amino acids by hydrophilic residues without any changes in protein structure and function can help to solve this problem. Such modification can be proposed using the analysis of 3D model of protein. In this work computer aided 3D structure of microsomal P450 2B4 (CYP2B4) was modeled for the further prediction of surface mutations for hydrophilization of the protein surface. The model of 3D structure of CYP2B4 was constructed by homology with CYP2C5 Model optimization was made by energy minimization and molecular dynamics simulation of protein molecule in water environment. The model was verified by using special statistic software and by comparison with the experimental data on the substrate recognition site, redox-partner binding sites and chemical modification of the protein surface.
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Affiliation(s)
- A A Sechenykh
- Orekhovich Institute of Biomedical Chemistry RAMS, 10, Pogodinskaya str., Moscow, 119121, Russia
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Hsu MH, Savas U, Griffin KJ, Johnson EF. Identification of peroxisome proliferator-responsive human genes by elevated expression of the peroxisome proliferator-activated receptor alpha in HepG2 cells. J Biol Chem 2001; 276:27950-8. [PMID: 11371553 DOI: 10.1074/jbc.m100258200] [Citation(s) in RCA: 147] [Impact Index Per Article: 6.4] [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: 01/13/2023] Open
Abstract
In mice and other sensitive species, PPARalpha mediates the induction of mitochondrial, microsomal, and peroxisomal fatty acid oxidation, peroxisome proliferation, liver enlargement, and tumors by peroxisome proliferators. In order to identify PPARalpha-responsive human genes, HepG2 cells were engineered to express PPARalpha at concentrations similar to mouse liver. This resulted in the dramatic induction of mRNAs encoding the mitochondrial HMG-CoA synthase and increases in fatty acyl-CoA synthetase (3-8-fold) and carnitine palmitoyl-CoA transferase IA (2-4-fold) mRNAs that were dependent on PPARalpha expression and enhanced by exposure to the PPARalpha agonist Wy14643. A PPAR response element was identified in the proximal promoter of the human HMG-CoA synthase gene that is functional in its native context. These data suggest that humans retain a capacity for PPARalpha regulation of mitochondrial fatty acid oxidation and ketogenesis. Human liver is refractory to peroxisome proliferation, and increased expression of mRNAs for the peroxisomal fatty acyl-CoA oxidase, bifunctional enzyme, or thiolase, which accompanies peroxisome proliferation in responsive species, was not evident following Wy14643 treatment of cells expressing elevated levels of PPARalpha. Additionally, no significant differences were seen for the expression of apolipoprotein AI, AII, or CIII; medium chain acyl-CoA dehydrogenase; or stearoyl-CoA desaturase mRNAs.
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Affiliation(s)
- M H Hsu
- Division of Biochemistry, Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, California 92037, USA
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Spatzenegger M, Wang Q, He YQ, Wester MR, Johnson EF, Halpert JR. Amino acid residues critical for differential inhibition of CYP2B4, CYP2B5, and CYP2B1 by phenylimidazoles. Mol Pharmacol 2001; 59:475-84. [PMID: 11179442 DOI: 10.1124/mol.59.3.475] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [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: 11/22/2022] Open
Abstract
The molecular basis for reversible inhibition of rabbit CYP2B4 and CYP2B5 and rat CYP2B1 by phenylimidazoles was assessed with active-site mutants and new three-dimensional models based on the crystal structure of CYP2C5. 4-Phenylimidazole was 17- to 32-fold more potent toward CYP2B4 and CYP2B1 than CYP2B5. The 3D models, along with site-directed mutagenesis data, revealed the importance of residue 114 for sensitivity to inhibition of all three CYP2B enzymes. Besides Ile 114, Val 367 was also found to be critical for inhibition of CYP2B4 and CYP2B1. The most interesting new insights were obtained from analysis of the CYP2B5 model and the CYP2B5 active-site mutants. Simultaneous substitution of residues 114, 294, 363, and 367 with the corresponding residues of CYP2B4 decreased the IC(50) value for inhibition by 4-phenylimidazole 12-fold. Docking 4-phenylimidazole into the models of CYP2B5 mutants demonstrated that the inhibitor-binding site is strongly influenced by residue-residue interactions, especially between residues 114 and 294. A chlorine substitution at position 4 of the phenyl moiety of 4- and 1-phenylimidazole resulted in IC(50) values 95- and 130-fold lower for CYP2B4 than for CYP2B5, respectively, suggesting that these compounds are selective inhibitors of CYP2B4. Overall, the study revealed that differences in the determinants of inhibition between CYP2B4 and CYP2B5 are caused not only by single residue inhibitor contacts but also by residue-residue interactions. This new generation of CYP2B models may provide valuable information for the design of selective inhibitors of human CYP2B6 and for the development of drugs that avoid drug interactions due to P450 inhibition.
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Affiliation(s)
- M Spatzenegger
- Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, Texas, USA
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Tsao CC, Wester MR, Ghanayem B, Coulter SJ, Chanas B, Johnson EF, Goldstein JA. Identification of human CYP2C19 residues that confer S-mephenytoin 4'-hydroxylation activity to CYP2C9. Biochemistry 2001; 40:1937-44. [PMID: 11329260 DOI: 10.1021/bi001678u] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [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: 11/28/2022]
Abstract
CYP2C19 is selective for the 4'-hydroxylation of S-mephenytoin while the highly similar CYP2C9 has little activity toward this substrate. To identify critical amino acids determining the specificity of human CYP2C19 for S-mephenytoin 4'-hydroxylation, we constructed chimeras by replacing portions of CYP2C9 containing various proposed substrate recognition sites (SRSs) with those of CYP2C19 and mutating individual residues by site-directed mutagenesis. Only a chimera containing regions encompassing SRSs 1--4 was active (30% of wild-type CYP2C19), indicating that multiple regions are necessary to confer specificity for S-mephenytoin. Mutagenesis studies identified six residues in three topological components of the proteins required to convert CYP2C9 to an S-mephenytoin 4'-hydroxylase (6% of the activity of wild-type CYP2C19). Of these, only the I99H difference located in SRS 1 between helices B and C reflects a change in a side chain that is predicted to be in the substrate-binding cavity formed above the heme prosthetic group. Two additional substitutions, S220P and P221T residing between helices F and G but not in close proximity to the substrate binding site together with five differences in the N-terminal portion of helix I conferred S-mephenytoin 4'-hydroxylation activity with a K(M) similar to that of CYP2C19 but a 3-fold lower K(cat). Three residues in helix I, S286N, V292A, and F295L, were essential for S-mephenytoin 4'-hydroxylation activity. On the basis of the structure of the closely related enzyme CYP2C5, these residues are unlikely to directly contact the substrate during catalysis but are positioned to influence the packing of substrate binding site residues and likely substrate access channels in the enzyme.
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Affiliation(s)
- C C Tsao
- Laboratory of Pharmacology and Chemistry, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709, USA
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Mukhopadhyay B, Johnson EF, Wolfe RS. A novel pH2 control on the expression of flagella in the hyperthermophilic strictly hydrogenotrophic methanarchaeaon Methanococcus jannaschii. Proc Natl Acad Sci U S A 2000; 97:11522-7. [PMID: 11027352 PMCID: PMC17233 DOI: 10.1073/pnas.97.21.11522] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.0] [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: 11/18/2022] Open
Abstract
The methanarchaeon, Methanococcus jannaschii, a hyperthermophilic, autotrophic, and strictly hydrogenotrophic inhabitant of submarine hydrothermal vents, was cultivated in a reactor at two hydrogen partial pressure (p(H(2))) values, 178 kPa (high) and 650 Pa (ultralow), and the cells were subjected to a comparative proteome analysis. From these studies, it was discovered that, when p(H(2)) was high and the cell density was low (a combination representing a hydrogen-excess condition), the cells possessed very low or undetectable levels of four flagella-related polypeptides (FlaB2, FlaB3, FlaD, and FlaE); electron microscopic examination showed that most of these cells were devoid of flagella. Flagella synthesis occurred when hydrogen became limiting either at high cell density under high p(H(2)) or at low cell density under low p(H(2)). The results from a p(H(2))-shift experiment corroborated the above observations. The p(H(2))-dependent changes in the levels of two methanogenic enzymes (MTD and HMDX) were as expected, and thus they served as internal controls. To our knowledge, this is the first example for the regulation of expression of flagella by hydrogen in any domain of life and for a control of any kind on flagella synthesis in the archaea. Our work also provides the only known example for each of the following: (i) the pure culture cultivation of a methanogen at an ultralow, near ecologically relevant p(H(2)); (ii) experimental functional genomics for M. jannaschii; and (iii) the use of proteomics with M. jannaschii.
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Affiliation(s)
- B Mukhopadhyay
- Department of Microbiology, University of Illinois at Urbana-Champaign, B103 Chemical and Life Sciences Laboratory, 601 South Goodwin Avenue, Urbana, IL 61801, USA.
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Abstract
Although microsomal P450s represent the majority of P450s, only microbial P450s have been amenable to crystal structure solution. We have recently solved the first crystal structure of a microsomal P450, 2C5, a progesterone hydroxylase from rabbit. We discuss the features of the protein in common with existing structures of microbial P450s and limitations of homology modeling mammalian P450s based on the microbial structures. Unique features involving membrane, substrate and cytochrome P450 reductase interactions are also discussed.
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Affiliation(s)
- P A Williams
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
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Jan AY, Johnson EF, Diamonti AJ, Carraway III KL, Anderson KS. Insights into the HER-2 receptor tyrosine kinase mechanism and substrate specificity using a transient kinetic analysis. Biochemistry 2000; 39:9786-803. [PMID: 10933796 DOI: 10.1021/bi9924922] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [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: 11/29/2022]
Abstract
The HER-2/erbB-2/c-neu proto-oncogene encodes for an EGF receptor-like protein which has been implicated in the pathogenesis of several human malignancies. Although much has been learned about the physiological significance of this receptor tyrosine kinase, its catalytic mechanism remains poorly understood. We have expressed, purified, and characterized two recombinant proteins corresponding to a full-length (HCD) and truncated (HKD) construct of the HER-2 intracellular tyrosine kinase domain and have identified an optimal substrate (GGMEDIYFEFMGGKKK; HER2Peptide) through screening of a degenerate peptide library. We have conducted a transient kinetic analysis of the HER-2 proteins (HCD and HKD) to illuminate mechanistic details of the HER-2 pathway. In particular, stopped-flow fluorescence studies with mant (N-methylanthraniloyl)-nucleotide derivatives provided direct measurements of the association and dissociation rate constants for these nucleotide interactions with the HER-2 recombinant proteins, thereby enabling the determination of nucleotide K(d) values. Moreover, the actual step of chemical catalysis was isolated using rapid chemical quench techniques and shown to occur approximately 3-fold faster than the steady-state rate which corresponds to product release. Evidence is also provided that suggests a conformational change that is partially rate-limiting at least in HCD. Furthermore, the role that the phosphorylation state of the protein may play on catalysis was examined. Studies carried out with pre-phosphorylated recombinant HER-2 proteins suggest that while autophosphorylation is not a prerequisite for enzymatic activity, this protein modification actually directly affects the catalytic mechanism by enhancing the rate of ADP release and that of the rate-limiting step. While a pre-steady-state kinetic analysis has been carried out on the catalytic subunit of cAMP-dependent serine/threonine kinase, to our knowledge, this study represents the first reported transient kinetic investigation of a receptor tyrosine kinase. This work serves as a basis for comparison of these two important protein kinase families and in this report we highlight these similarities and differences.
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Affiliation(s)
- A Y Jan
- Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut 06520-8066, USA
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Savas U, Wester MR, Griffin KJ, Johnson EF. Rabbit pregnane X receptor is activated by rifampicin. Drug Metab Dispos 2000; 28:529-37. [PMID: 10772631] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
Reverse transcriptase-polymerase chain reaction was used to amplify a partial cDNA from rabbit lung mRNA that shared 77% protein sequence identity with the mouse pregnane X receptor (PXR). Rapid amplification of cDNA ends from a rabbit kidney lambdaZAP expression library resulted in the isolation of overlapping cDNAs spanning the complete coding sequence. The deduced amino acid sequence of 411 residues exhibited 79% overall amino acid identity with human PXR and 77% identity with mouse PXR. Based on this protein sequence relationship and a similar degree of conservation exhibited by the mouse and human PXR orthologs, the cDNA appears to encode the rabbit PXR ortholog. 5'-rapid amplification of cDNA ends performed on an adaptor-ligated cDNA library from rabbit liver revealed the presence of an alternate mRNA, which differed at the 5'-terminus. RNase protection assays indicated that the alternate mRNA was expressed at >50-fold lower levels in rabbit kidney and liver. Rifampicin treatment of CV-1 cells cotransfected with a rabbit PXR expression plasmid and a luciferase reporter construct containing two copies of the DR3 enhancer from CYP3A23 produced a 6-fold induction of luciferase activity. In contrast, rat PXR was not responsive to this antibiotic under the same conditions. Pregnenolone 16alpha-carbonitrile was an efficacious activator of rat PXR, but failed to significantly activate rabbit PXR at equivalent concentrations. These results indicate that the ligand activation profile of rabbit PXR is distinct from rat PXR and more closely resembles that of human PXR. The rabbit PXR activation profile is consistent with the cytochrome P450 (P450) 3A6 induction profile in rabbits.
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Affiliation(s)
- U Savas
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, California 92037, USA
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Wester MR, Lasker JM, Johnson EF, Raucy JL. CYP2C19 participates in tolbutamide hydroxylation by human liver microsomes. Drug Metab Dispos 2000; 28:354-9. [PMID: 10681382] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
Tolbutamide is a sulfonylurea-type oral hypoglycemic agent whose action is terminated by hydroxylation of the tolylsulfonyl methyl moiety catalyzed by cytochrome P-450 (CYP) enzymes of the human CYP2C subfamily. Although most studies have implicated CYP2C9 as the exclusive catalyst of hepatic tolbutamide hydroxylation in humans, there is evidence that other CYP2C enzymes (e.g., CYP2C19) may also participate. To that end, we used an immunochemical approach to assess the role of individual CYP2Cs in microsomal tolbutamide metabolism. Polyclonal antibodies were raised to CYP2C9 purified from human liver, and were then back-adsorbed against recombinant CYP2C19 coupled to a solid-phase support. Western blotting revealed that the absorbed anti-human CYP2C9 preparation reacted with only recombinant CYP2C9 and the corresponding native protein in hepatic microsomes, and no longer recognized CYP2C19 and CYP2C8. Monospecific anti-CYP2C9 not only retained the ability to inhibit CYP2C9-catalyzed reactions, as evidenced by its marked (90%) inhibition of diclofenac 4'-hydroxylation by purified CYP2C9 and by human liver microsomes, but also exhibited metabolic specificity, as indicated by its negligible (<15%) inhibitory effect on S-mephenytoin 4'-hydroxylation by purified CYP2C19 or hepatic microsomes containing CYP2C19. Monospecific anti-CYP2C9 was also found to inhibit rates of tolbutamide hydroxylation by 93 +/- 4 and 78 +/- 6% in CYP2C19-deficient and CYP2C19-containing human liver microsomes, respectively. Taken together, our results indicate that both CYP2C9 and CYP2C19 are involved in tolbutamide hydroxylation by human liver microsomes, and that CYP2C19 underlies at least 14 to 22% of tolbutamide metabolism. Although expression of CYP2C19 in human liver is less than that of CYP2C9, it may play an important role in tolbutamide disposition in subjects expressing either high levels of CYP2C19 or a catalytically deficient CYP2C9 enzyme.
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Affiliation(s)
- M R Wester
- Toxicology Program, University of New Mexico, College of Pharmacy, Albuquerque, New Mexico, USA
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Cosme J, Johnson EF. Engineering microsomal cytochrome P450 2C5 to be a soluble, monomeric enzyme. Mutations that alter aggregation, phospholipid dependence of catalysis, and membrane binding. J Biol Chem 2000; 275:2545-53. [PMID: 10644712 DOI: 10.1074/jbc.275.4.2545] [Citation(s) in RCA: 141] [Impact Index Per Article: 5.9] [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: 11/06/2022] Open
Abstract
Deletion of the N-terminal membrane-spanning domain from microsomal P450s 2C5 and 2C3 generates the enzymes, 2C5dH and 2C3dH, that exhibit a salt-dependent association with membranes indicating that they retain a monofacial membrane interaction domain. The two proteins are tetramers and dimers, respectively, in high salt buffers, and only 2C5dH requires phospholipids to reconstitute fully the catalytic activity of the enzyme. Amino acid residues derived from P450 2C3dH between residues 201 and 210 were substituted for the corresponding residues in P450 2C5 to identify those that would diminish the membrane interaction, the phospholipid dependence of catalysis, and aggregation of 2C5dH. Each of four substitutions, N202H, I207L, S209G, and S210T, diminished the aggregation of P450 2C5dH and produced a monomeric enzyme. The N202H and I207L mutations also diminished the stimulation of catalytic activity by phospholipid and reduced the binding of P450 2C5dH to phospholipid vesicles. The modified enzymes exhibit rates of progesterone 21-hydroxylation that are similar to that of P450 2C5dH. These conditionally membrane-bound P450s with improved solubility in high salt buffers are suitable for crystallization and structural determination by x-ray diffraction studies.
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Affiliation(s)
- J Cosme
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, USA
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Williams PA, Cosme J, Sridhar V, Johnson EF, McRee DE. Mammalian microsomal cytochrome P450 monooxygenase: structural adaptations for membrane binding and functional diversity. Mol Cell 2000; 5:121-31. [PMID: 10678174 DOI: 10.1016/s1097-2765(00)80408-6] [Citation(s) in RCA: 534] [Impact Index Per Article: 22.3] [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: 10/26/2022]
Abstract
Microsomal cytochrome P450s participate in xenobiotic detoxification, procarcinogen activation, and steroid hormone synthesis. The first structure of a mammalian microsomal P450 suggests that the association of P450s with the endoplasmic reticulum involves a hydrophobic surface of the protein formed by noncontiguous portions of the polypeptide chain. This interaction places the entrance of the putative substrate access channel in or near the membrane and orients the face of the protein proximal to the heme cofactor perpendicular to the plane of the membrane for interaction with the P450 reductase. This structure offers a template for modeling other mammalian P450s and should aid drug discovery and the prediction of drug-drug interactions.
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Affiliation(s)
- P A Williams
- Department of Molecular Biology MB-8, Scripps Research Institute, La Jolla, California 92037, USA
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Savas U, Griffin KJ, Johnson EF. Molecular mechanisms of cytochrome P-450 induction by xenobiotics: An expanded role for nuclear hormone receptors. Mol Pharmacol 1999; 56:851-7. [PMID: 10531387 DOI: 10.1124/mol.56.5.851] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Affiliation(s)
- U Savas
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, California 92037, USA
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Mukhopadhyay B, Johnson EF, Wolfe RS. Reactor-scale cultivation of the hyperthermophilic methanarchaeon Methanococcus jannaschii to high cell densities. Appl Environ Microbiol 1999; 65:5059-65. [PMID: 10543823 PMCID: PMC91681 DOI: 10.1128/aem.65.11.5059-5065.1999] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.3] [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: 11/20/2022] Open
Abstract
For the hyperthermophilic and barophilic methanarchaeon Methanococcus jannaschii, we have developed a medium and protocols for reactor-scale cultivation that improved the final cell yield per liter from approximately 0.5 to approximately 7.5 g of packed wet cells ( approximately 1.8 g dry cell mass) under autotrophic growth conditions and to approximately 8.5 g of packed wet cells ( approximately 2 g dry cell mass) with yeast extract (2 g liter(-1)) and tryptone (2 g liter(-1)) as medium supplements. For growth in a sealed bottle it was necessary to add Se to the medium, and a level of 2 microM for added Se gave the highest final cell yield. In a reactor M. jannaschii grew without added Se in the medium; it is plausible that the cells received Se as a contaminant from the reactor vessel and the H(2)S supply. But, for the optimal performance of a reactor culture, an addition of Se to a final concentration of 50 to 100 microM was needed. Also, cell growth in a reactor culture was inhibited at much higher Se concentrations. These observations and the data from previous work with methanogen cell extracts (B. C. McBride and R. S. Wolfe, Biochemistry 10:4312-4317, 1971) suggested that from a continuously sparged reactor culture Se was lost in the exhaust gas as volatile selenides, and this loss raised the apparent required level of and tolerance for Se. In spite of having a proteinaceous cell wall, M. jannaschii withstood an impeller tip speed of 235.5 cms(-1), which was optimal for achieving high cell density and also was the higher limit for the tolerated shear rate. The organism secreted one or more acidic compounds, which lowered pH in cultures without pH control; this secretion continued even after cessation of growth.
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Affiliation(s)
- B Mukhopadhyay
- Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
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