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Malaweera A, Dayan S, Pellicano R, Hoi A, Kitching AR, Kent JR. The use of belimumab in three cases of refractory lupus nephritis. Intern Med J 2023; 53:1901-1906. [PMID: 37859540 DOI: 10.1111/imj.16242] [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: 05/04/2023] [Accepted: 07/18/2023] [Indexed: 10/21/2023]
Abstract
In recent trials for the treatment of systemic lupus erythematosus (SLE), belimumab (BLM), in addition to standard immunosuppression, has been shown to improve renal and nonrenal outcomes. We report our experience using BLM in three cases of refractory lupus nephritis (LN), where renal remission was not achieved using cyclophosphamide, mycophenolate mofetil and other immunosuppressive medications. In two of the three cases, BLM therapy led to a partial remission of LN, improvement in serological markers of SLE and disease activity, which permitted a reduction in prednisolone dosing. Treatment with efficacious therapies early in the course of LN is a desirable therapeutic strategy, to achieve early remission of proteinuria and curtail the development of irreversible chronic renal damage. Further studies are needed to provide information on the effectiveness of BLM for maintenance of remission, prevention of flares and monitoring for long-term complications of B-cell modulation.
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Affiliation(s)
- Aruni Malaweera
- Department of Nephrology, Monash Health, Melbourne, Victoria, Australia
| | - Sukhpal Dayan
- Department of Pathology, Monash Health, Melbourne, Victoria, Australia
| | - Rebecca Pellicano
- Department of Nephrology, Monash Health, Melbourne, Victoria, Australia
| | - Alberta Hoi
- Department of Rheumatology, Monash Health, Melbourne, Victoria, Australia
| | - A Richard Kitching
- Department of Nephrology, Monash Health, Melbourne, Victoria, Australia
- Department of Medicine, Centre for Inflammatory Diseases, Monash University, Melbourne, Victoria, Australia
| | - Joanna R Kent
- Department of Nephrology, Monash Health, Melbourne, Victoria, Australia
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Mermutluoğlu Ç, Tekin R, Tekin RC, Tekin S, Canpolat Erkan RE, Deveci Ö, Aydoğdu G, Çelen MK, Dayan S. Evulation of prolidase enzyme, and galectin levels as a marker for fibrosis in patients with chronic hepatitis B. Eur Rev Med Pharmacol Sci 2022; 26:9467-9472. [PMID: 36591855 DOI: 10.26355/eurrev_202212_30698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
OBJECTIVE The fibrosis can be detected using non-invasive methods including prolidase activity, proline levels and galectin-3 (GAL-3) detection in the serum. The aim of this study was to investigate the liver fibrosis through non-invasive methods in chronic hepatitis B patients. PATIENTS AND METHODS This prospective case control study includes 56 patients with Chronic Active Hepatitis B (CAHB), 57 patients with Inactive Hepatitis B (IHB), and 60 healthy matched control subjects. The first group included the CAHB [hepatitis B surface antigen (HBsAg): positive; HBV DNA >2,000 IU/mL; normal or high alanine aminotransferase (ALT) value] undergo a liver biopsy, while the second group included the IHB (HBsAg: positive; HBV DNA: negative; normal ALT value). The third group comprised the healthy controls. Serum prolidase enzyme activities (SPEA), proline and galectin-3 levels were measured for each group. RESULTS Patients with CAHB had significantly higher SPEA levels (1,004.3±186.8 IU/L) than did the controls (196.5±306 IU/L) (p<0.001). Significantly higher serum GAL-3 levels were found in the CHB group compared with HBV carrier and the control groups (27.4±32.2 ng/mL, 6.5±13.4 ng/mL, 3.1±5.7 ng/mL, respectively, p<0.001). The relationship between serum prolidase activity, hidroxiprolyne and fibrosis (p<0.05). There were no significant differences in ALT levels between inactive HBV carriers and the control groups (p>0.05). CONCLUSIONS We suppose that hidroxiprolyne levels and prolidase enzyme activity might be an indicator as a marker for fibrosis in CAHB and the evaluation of response to treatment.
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Affiliation(s)
- Ç Mermutluoğlu
- Department of Infectious Diseases and Clinical Microbiology, Faculty of Medicine, Dicle University, Diyarbakir, Turkey.
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3
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Chow KL, Kanellis J, Dayan S, Ryan J. Recurrent membranoproliferative glomerulonephritis in a renal transplant secondary to monoclonal gammopathy of renal significance successfully treated with bortezomib. Intern Med J 2019; 49:801-802. [PMID: 31185533 DOI: 10.1111/imj.14313] [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: 06/13/2018] [Revised: 07/23/2018] [Accepted: 09/05/2018] [Indexed: 11/29/2022]
Affiliation(s)
- Ke Li Chow
- Department of Nephrology, Monash Medical Centre, Melbourne, Victoria, Australia
| | - John Kanellis
- Department of Nephrology, Monash Medical Centre, Melbourne, Victoria, Australia
| | - Sukhpal Dayan
- Department of Pathology, Monash Medical Centre, Melbourne, Victoria, Australia
| | - Jessica Ryan
- Department of Nephrology, Monash Medical Centre, Melbourne, Victoria, Australia.,Department of Medicine, Monash University, Melbourne, Victoria, Australia
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Abstract
Periodontal disease is a bacterial infection that results in inflammatory destruction of tissues that support the teeth, including connective tissue and bone. In this study, we report that transgenic mice that overexpress the 17-kDa form of IL-1α in the basal layer of oral mucosal epithelium develop a syndrome that possesses all of the cardinal features of periodontal disease, including epithelial proliferation and apical migration, loss of attachment, and destruction of cementum and alveolar bone. In this model, bacterial colonization and infection were not required, since levels of periodontal bacteria were equivalent in transgenic and wild-type mice, and continuous treatment with antibiotics from birth did not ameliorate the disease. Our findings therefore indicate that elevated levels of IL-1α in the oral micro-environment can mediate all of the clinical features of periodontal disease.
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Affiliation(s)
- S Dayan
- Department of Cytokine Biology, The Forsyth Institute, 140 The Fenway, Boston, MA 02115, USA
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5
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Erdem H, Ozturk-Engin D, Elaldi N, Gulsun S, Sengoz G, Crisan A, Johansen I, Inan A, Nechifor M, Al-Mahdawi A, Civljak R, Ozguler M, Savic B, Ceran N, Cacopardo B, Inal A, Namiduru M, Dayan S, Kayabas U, Parlak E, Khalifa A, Kursun E, Sipahi O, Yemisen M, Akbulut A, Bitirgen M, Dulovic O, Kandemir B, Luca C, Parlak M, Stahl J, Pehlivanoglu F, Simeon S, Ulu-Kilic A, Yasar K, Yilmaz G, Yilmaz E, Beovic B, Catroux M, Lakatos B, Sunbul M, Oncul O, Alabay S, Sahin-Horasan E, Kose S, Shehata G, Andre K, Alp A, Ćosic G, Gul HC, Karakas A, Chadapaud S, Hansmann Y, Harxhi A, Kirova V, Masse-Chabredier I, Oncu S, Sener A, Tekin R, Deveci O, Karabay O, Agalar C. The microbiological diagnosis of tuberculous meningitis of Haydarpasa-1 study. Clin Microbiol Infect 2014; 20:O600-8. [DOI: 10.1111/1469-0691.12478] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 11/21/2013] [Accepted: 11/22/2013] [Indexed: 12/17/2022]
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6
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Ford SL, Polkinghorne KR, Longano A, Dowling J, Dayan S, Kerr PG, Holdsworth SR, Kitching AR, Summers SA. Histopathologic and Clinical Predictors of Kidney Outcomes in ANCA-Associated Vasculitis. Am J Kidney Dis 2014; 63:227-35. [DOI: 10.1053/j.ajkd.2013.08.025] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Accepted: 08/30/2013] [Indexed: 11/11/2022]
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7
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Ulu-Kilic A, Karakas A, Erdem H, Turker T, Inal AS, Ak O, Turan H, Kazak E, Inan A, Duygu F, Demiraslan H, Kader C, Sener A, Dayan S, Deveci O, Tekin R, Saltoglu N, Aydın M, Horasan ES, Gul HC, Ceylan B, Kadanalı A, Karabay O, Karagoz G, Kayabas U, Turhan V, Engin D, Gulsun S, Elaldı N, Alabay S. Update on treatment options for spinal brucellosis. Clin Microbiol Infect 2013; 20:O75-82. [PMID: 24118178 DOI: 10.1111/1469-0691.12351] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 07/26/2013] [Accepted: 07/27/2013] [Indexed: 12/14/2022]
Abstract
We evaluated the efficacy and tolerability of antibiotic regimens and optimal duration of therapy in complicated and uncomplicated forms of spinal brucellosis. This is a multicentre, retrospective and comparative study involving a total of 293 patients with spinal brucellosis from 19 health institutions. Comparison of complicated and uncomplicated spinal brucellosis was statistically analysed. Complicated spinal brucellosis was diagnosed in 78 (26.6%) of our patients. Clinical presentation was found to be significantly more acute, with fever and weight loss, in patients in the complicated group. They had significantly higher leukocyte and platelet counts, erythrocyte sedimentation rates and C-reactive protein levels, and lower haemoglobulin levels. The involvement of the thoracic spine was significantly more frequent in complicated cases. Spondylodiscitis was complicated, with paravertebral abscess in 38 (13.0%), prevertebral abscess in 13 (4.4%), epidural abscess in 30 (10.2%), psoas abscess in 10 (3.4%) and radiculitis in 8 (2.7%) patients. The five major combination regimens were: doxycycline 200 mg/day, rifampicin 600 mg/day and streptomycin 1 g/day; doxycycline 200 mg/day, rifampicin 600 mg/day and gentamicin 5 mg/kg; doxycycline 200 mg/day and rifampicin 600 mg/day; doxycycline 200 mg/day and streptomycin 1 g/day; and doxycycline 200 mg/day, rifampicin 600 mg/day and ciprofloxacin 1 g/day. There were no significant therapeutic differences between these antibiotic groups; the results were similar regarding the complicated and uncomplicated groups. Patients were mostly treated with doxycycline and rifampicin with or without an aminoglycoside. In the former subgroup, complicated cases received antibiotics for a longer duration than uncomplicated cases. Early recognition of complicated cases is critical in preventing devastating complications. Antimicrobial treatment should be prolonged in complicated spinal brucellosis in particular.
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Affiliation(s)
- A Ulu-Kilic
- Department of Infectious Disease and Clinical Microbiology (IDCM), Erciyes University School of Medicine, Kayseri, Turkey
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8
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Erdem H, Kilic S, Sener B, Acikel C, Alp E, Karahocagil M, Yetkin F, Inan A, Kecik-Bosnak V, Gul H, Tekin-Koruk S, Ceran N, Demirdal T, Yilmaz G, Ulu-Kilic A, Ceylan B, Dogan-Celik A, Nayman-Alpat S, Tekin R, Yalci A, Turban V, Karaoglan I, Yilmaz H, Mete B, Batirel A, Ulcay A, Dayan S, Seza Inal A, Ahmed S, Tufan Z, Karakas A, Teker B, Namiduru M, Savasci U, Pappas G. Diagnosis of chronic brucellar meningitis and meningoencephalitis: the results of the Istanbul-2 study. Clin Microbiol Infect 2013; 19:E80-6. [DOI: 10.1111/1469-0691.12092] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2012] [Revised: 10/15/2012] [Accepted: 10/31/2012] [Indexed: 11/29/2022]
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9
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Masliah E, Xie F, Dayan S, Rockenstein E, Mante M, Adame A, Patrick CM, Chan AF, Zheng B. Genetic deletion of Nogo/Rtn4 ameliorates behavioral and neuropathological outcomes in amyloid precursor protein transgenic mice. Neuroscience 2010; 169:488-94. [PMID: 20433905 DOI: 10.1016/j.neuroscience.2010.04.045] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 04/07/2010] [Accepted: 04/22/2010] [Indexed: 11/26/2022]
Abstract
The cognitive impairment in Alzheimer's disease (AD) is associated with synaptic loss, neuritic sprouting and altered neuroplasticity. Compensatory neuritic sprouting might be beneficial, while aberrant sprouting could contribute to the neurodegenerative process. Nogo (or Rtn4) is a major myelin-derived inhibitor of axonal sprouting in adult CNS. Recent evidence has implicated both the Reticulon family of proteins and a receptor for Nogo, NgR, in reducing amyloid-beta production, a key step in AD pathogenesis. To test the hypothesis that Nogo, as an inhibitor of axonal sprouting, modulates disease progression in a mouse model of AD, we introduced an APP transgene (a human APP minigene carrying the Swedish and Indiana mutations under the platelet-derived growth factor subunit B (PDGFB) promoter) into a Nogo null background and characterized the behavioral and neuropathological consequences. We found that deleting Nogo ameliorates learning and memory deficits of APP transgenic mice in the Morris water maze at an early/intermediate stage of the disease. Furthermore, deleting Nogo restored the expression levels of markers for synapto-dendritic complexity and axonal sprouting including synaptophysin, MAP2, GAP43 and neurofilament that are otherwise reduced in APP transgenic mice. Other aspects of disease progression including neuronal loss, astrogliosis, microgliosis and, importantly, Abeta levels and amyloid deposits were not significantly altered by Nogo deletion. These data support the hypothesis that Nogo-mediated inhibition of neuritic sprouting contributes to the disease progression in an APP transgenic model of AD in a way that is mechanistically distinct from what has been proposed for Rtn3 or NgR.
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Affiliation(s)
- E Masliah
- Department of Neurosciences, University of California San Diego, School of Medicine, 9500 Gilman Drive, La Jolla, CA 92093, USA
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10
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Figueiredo ML, Dayan S, Kim Y, McBride J, Kupper TS, Wong DTW. Expression of cell-cycle regulator CDK2-associating protein 1 (p12CDK2AP1) in transgenic mice induces testicular and ovarian atrophy in vivo. Mol Reprod Dev 2007; 73:987-97. [PMID: 16496417 DOI: 10.1002/mrd.20458] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The novel cell-cycle regulator p12(CDK2AP1) (p12) gene encodes a cyclin-dependent kinase 2 (CDK2) partner that participates in cell-cycle regulation, apoptosis, and proliferation. CDK2 has been implicated in maintenance of gonadal homeostasis, as knockout mice display reproductive abnormalities. To investigate the role of p12 in homeostasis of gonadal tissues in vivo, we generated a transgenic mouse model driven by the human keratin 14 promoter, reported to target transgene expression to gonadal tissues and also stratified epithelia. Overexpression of the transgene was associated with a gonadal atrophy phenotype in mice of both sexes, yet fertility was not impaired. Histological evaluation of testes showed seminiferous tubule degeneration and decreased tubule diameter. Female transgenic mice had small ovaries, with a higher number of atretic follicles/mm(2) as compared to control nontransgenic mice. Also observed was increased germ cell apoptosis in both sexes (TUNEL). These results suggest that overexpression of p12 leads to testicular and ovarian abnormalities, a phenotype closely related to that of cdk2-/- mice. In combination, these observations suggest that the p12/CDK2 signaling pathways are carefully orchestrated to maintain proper gonadal tissue homeostasis. We suggest that the mechanisms of this regulation may be through p12-mediated altered expression of gonadal-specific genes and apoptotic pathways.
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Affiliation(s)
- M L Figueiredo
- Laboratory of Head and Neck Cancer Research, School of Dentistry and Dental Research Institute, University of California at Los Angeles, Division of Head & Neck Surgery/Otolaryngology, Jonsson Comprehensive Cancer Center, 90095, USA
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11
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O'Keefe LV, Liu Y, Perkins A, Dayan S, Saint R, Richards RI. Erratum: FRA16D common chromosomal fragile site oxido-reductase (FOR/WWOX) protects against the effects of ionizing radiation in Drosophila. Oncogene 2006. [DOI: 10.1038/sj.onc.1210119] [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: 11/09/2022]
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12
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Handt O, Baker E, Dayan S, Gartler SM, Woollatt E, Richards RI, Hansen RS. Analysis of replication timing at the FRA10B and FRA16B fragile site loci. Chromosome Res 2001; 8:677-88. [PMID: 11196131 DOI: 10.1023/a:1026737203447] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [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: 11/12/2022]
Abstract
The molecular basis for the cytogenetic appearance of chromosomal fragile sites is not yet understood. Late replication and further delay of replication at fragile sites expressing alleles has been observed for FRAXA, FRAXE and FRA3B fragile site loci. We analysed the timing of replication at the FRA10B and FRA16B loci to determine whether late replication is a feature which is shared by all fragile sites and, therefore, is a necessary condition for chromosomal fragile site expression. The FRA10B locus was located in a transitional region between early and late zones of replication. Fragile and non-fragile alleles exhibit a similar replication pattern proximal to the repeat but fragile alleles are delayed relative to non-fragile ones on the distal side. Although fragility at FRA10B appears to be caused by expansion of an AT-rich repeat in the region, replication time near the repeat was similar in fragile and non-fragile alleles. The FRA16B locus was late replicating and appeared to replicate even later on fragile chromosomes. While these observations are compatible with the hypothesis that delayed replication may play a role in fragile site expression, they suggest that replication delay may not need to occur at the expanded repeat region itself in order to be permissive for fragility.
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Affiliation(s)
- O Handt
- Department of Cytogenetics and Molecular Genetics, Women's and Children's Hospital, North Adelaide, Australia.
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13
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Affiliation(s)
- S Dayan
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
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14
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Ried K, Finnis M, Hobson L, Mangelsdorf M, Dayan S, Nancarrow JK, Woollatt E, Kremmidiotis G, Gardner A, Venter D, Baker E, Richards RI. Common chromosomal fragile site FRA16D sequence: identification of the FOR gene spanning FRA16D and homozygous deletions and translocation breakpoints in cancer cells. Hum Mol Genet 2000; 9:1651-63. [PMID: 10861292 DOI: 10.1093/hmg/9.11.1651] [Citation(s) in RCA: 217] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Fluorescence in situ hybridization of a tile path of DNA subclones has previously enabled the cyto-genetic definition of the minimal DNA sequence which spans the FRA16D common chromosomal fragile site, located at 16q23.2. Homozygous deletion of the FRA16D locus has been reported in adenocarcinomas of stomach, colon, lung and ovary. We have sequenced the 270 kb containing the FRA16D fragile site and the minimal homozygously deleted region in tumour cells. This sequence enabled localization of some of the tumour cell breakpoints to regions which contain AT-rich secondary structures similar to those associated with the FRA10B and FRA16B rare fragile sites. The FRA16D DNA sequence also led to the identification of an alternatively spliced gene, named FOR (fragile site FRA16D oxidoreductase), exons of which span both the fragile site and the minimal region of homozygous deletion. In addition, the complete DNA sequence of the FRA16D-containing FOR intron reveals no evidence of additional authentic transcripts. Alternatively spliced FOR transcripts (FOR I, FOR II and FOR III) encode proteins which share N-terminal WW domains and differ at their C-terminus, with FOR III having a truncated oxidoreductase domain. FRA16D-associated deletions selectively affect the FOR gene transcripts. Three out of five previously mapped translocation breakpoints in multiple myeloma are also located within the FOR gene. FOR is therefore the principle genetic target for DNA instability at 16q23.2 and perturbation of FOR function is likely to contribute to the biological consequences of DNA instability at FRA16D in cancer cells.
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MESH Headings
- Alternative Splicing
- Amino Acid Sequence
- Blotting, Northern
- Chromosome Fragile Sites
- Chromosome Fragility
- Chromosomes, Human, Pair 16/genetics
- DNA, Neoplasm/chemistry
- DNA, Neoplasm/genetics
- Female
- Gene Expression Regulation, Neoplastic
- Humans
- Male
- Molecular Sequence Data
- Neoplasms/genetics
- Neoplasms/pathology
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Tissue Distribution
- Transcription, Genetic
- Tumor Cells, Cultured
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Affiliation(s)
- K Ried
- Department of Cytogenetics and Molecular Genetics, Women's and Children's Hospital, Adelaide, South Australia, Australia
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Mangelsdorf M, Ried K, Woollatt E, Dayan S, Eyre H, Finnis M, Hobson L, Nancarrow J, Venter D, Baker E, Richards RI. Chromosomal fragile site FRA16D and DNA instability in cancer. Cancer Res 2000; 60:1683-9. [PMID: 10749140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
It has been proposed that common aphidicolin-inducible fragile sites, in general, predispose to specific chromosomal breakage associated with deletion, amplification, and/or translocation in certain forms of cancer. Although this appears to be the case for the fragile site FRA3B and may be the case for FRA7G, it is not yet clear whether this association is a general property of this class of fragile site. The major aim of the present study was to determine whether the FRA16D chromosomal fragile site locus has a role to play in predisposing DNA sequences within and adjacent to the fragile site to DNA instability (such as deletion or translocation), which could lead to or be associated with neoplasia. We report the localization of FRA16D within a contig of cloned DNA and demonstrate that this fragile site coincides with a region of homozygous deletion in a gastric adenocarcinoma cell line and is bracketed by translocation breakpoints in multiple myeloma, as reported previously (Chesi, M., et al., Blood, 91: 4457-4463, 1998). Therefore, given similar findings at the FRA3B and FRA7G fragile sites, it is likely that common aphidicolin-inducible fragile sites exhibit the general property of localized DNA instability in cancer cells.
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Affiliation(s)
- M Mangelsdorf
- Department of Cytogenetics and Molecular Genetics, Women's and Children's Hospital, Adelaide, South Australia, Australia
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Abstract
For more than 50 years the synthesis of 1,10-phenanthroline-N,N'-dioxide (2) has been sought. The reason for the failure of all the earlier attempts is that the limited space in the bay area of the starting material 1,10-phenanthroline (1) cannot accommodate two oxygen atoms. The oxidation has now been achieved with the oxygen-transfer agent HOF small middle dotCH(3)CN, and X-ray studies have revealed that the product is not planar but is a new type of helicene-in this way the "space problem" for the two oxygen atoms has been solved.
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Affiliation(s)
- S Rozen
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel-Aviv 69978 (Israel)
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Dayan S, Simmons RK, Ahmed AR. Contemporary issues in the diagnosis of oral pemphigoid: a selective review of the literature. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1999; 88:424-30. [PMID: 10519749 DOI: 10.1016/s1079-2104(99)70056-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Pemphigoid is a group of bullous diseases that have a diversified morphologic presentation and affect the skin, oral mucosa, and other mucosal membranes, alone or in combination. In the literature, the condition has been subclassified into bullous pemphigoid and cicatricial pemphigoid (mucous membrane pemphigoid) on the basis of the primary organ of involvement. In addition to the clinical presentation and a subepithelial vesicle or bullae on routine histologic analysis, the diagnosis is based on direct and indirect immunofluorescence studies. Recent investigations indicate that different clinical groups of patients with pemphigoid produce autoantibodies to different molecules within the basement membrane zone. Based on these recent observations and a review of the literature, a viewpoint is presented that not all patients with cicatricial pemphigoid should be grouped together. Rather, they should be classified into subgroups-ocular, oral, etc-on the basis of the clinical phenotype and long-term follow-up. Such a division will facilitate the provision of appropriate and relevant treatment plans; if the clinical course changes, the diagnosis can be adjusted. This strategy will prevent patients with disease limited to the oral cavity from receiving systemic drugs or agents that may be more harmful than beneficial.
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Affiliation(s)
- S Dayan
- Harvard School of Dental Medicine, Boston, MA 02115, USA
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Burmeister WP, Daniels RS, Dayan S, Gagnon J, Cusack S, Ruigrok RW. Sequence and crystallization of influenza virus B/Beijing/1/87 neuraminidase. Virology 1991; 180:266-72. [PMID: 1984652 DOI: 10.1016/0042-6822(91)90031-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Influenza B/Beijing/1/87 neuraminidase heads were isolated from virus via trypsin digestion and characterized by PAGE, N-terminal sequencing, electron microscopy, and enzyme activity. The heads were crystallized into two crystal forms; tetragonal plates, like other neuraminidase crystals described before, that diffract to medium resolution (3 A) and a new form consisting of trigonal prisms or needles that diffract to high resolution (at least 2 A). The gene segment coding for neuraminidase was sequenced and compared with the neuraminidase sequence of B/Lee/40. The deduced amino acid sequences for neuraminidase showed only a 7% difference, whereas those for the NB proteins differed by 20%.
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Abstract
Adenovirus type 2 fibres in crystals appear to be significantly longer than found previously (accompanying paper). We therefore examined isolated fibre by electron microscopy and measured a length of 370 A, consistent with the length found in the crystals. The specific N-terminal structure of the fibre caused a heterogeneity in the length that may at least partially explain the values of 280 to 310 A published previously. Green et al. described a 15 amino acid repeat in the primary structure of the shaft of the fibre thought to be associated with the specific three-dimensional folding of the shaft. We compared the adenovirus type 2 (with 22 repeats) and type 3 (with 6 repeats) fibre lengths and derived a contribution of 13.2 A to the length of the shaft per 15 amino acid repeat. Specific morphological features of the fibre are discussed in relation to its amino acid sequence.
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20
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Affiliation(s)
- S Dayan
- EMBL Grenoble Outstation, France
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Fried F, Searby G, Seurin-Vellutini M, Dayan S, Sixou P. Quasi-elastic light scattering from dilute solutions of a semi-rigid macromolecule: cellulose tricarbanilate. POLYMER 1982. [DOI: 10.1016/0032-3861(82)90118-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Navard P, Haudin JM, Dayan S, Sixou P. DSC study of liquid crystalline solutions of cellulose acetate in trifluoroacetic acid. ACTA ACUST UNITED AC 1981. [DOI: 10.1002/pol.1981.130190801] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Abstract
Vesicoureteral reflux and chronic pyelonephritis are usually associated with proteinuria of less than 1 gm. per 24 hours. When there is massive proteinuria an associated glomerulopathy is usually present. We describe a patient who had nephrotic syndrome with radiological evidence of ureterovesical reflux and histological evidence of chronic pyelonephritis without associated glomerulonephritis.
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