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Lim E, Wu D, Pal B, Bouras T, Asselin-Labat ML, Vaillant F, Yagita H, Lindeman GJ, Smyth GK, Visvader JE. Abstract P4-04-03: Transcriptome Analyses of Mouse and Human Mammary Cell Subpopulations Reveals Multiple Conserved Genes and Pathways. Cancer Res 2010. [DOI: 10.1158/0008-5472.sabcs10-p4-04-03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
INTRODUCTION: Molecular characterization of the normal epithelial cell types that reside in the mammary gland is an important step toward understanding pathways that regulate self-renewal, lineage commitment, and differentiation along the hierarchy. We previously reported distinct stages in human mammary epithelial cell development and linked them to breast tumor subtypes previously defined by gene expression profiling. Here we determined the gene expression signatures of four distinct subpopulations isolated from the mouse mammary gland. The epithelial cell signatures were used to interrogate mouse models of mammary tumorigenesis and to compare with their normal human counterpart subsets to identify conserved genes and networks.
METHODS: RNA was prepared from freshly sorted mouse mammary cell subpopulations (mammary stem cell (MaSC)-enriched, committed luminal progenitor, mature luminal and stromal cell) and used for gene expression profiling analysis on the Illumina platform. Gene signatures were derived and compared with those previously reported for the analogous normal human mammary cell subpopulations. The mouse and human epithelial subset signatures were then subjected to Ingenuity Pathway Analysis (IPA) to identify conserved pathways.
RESULTS: The four mouse mammary cell subpopulations exhibited distinct gene signatures. Comparison of these signatures with the molecular profiles of different mouse models of mammary tumorigenesis revealed that tumors arising in MMTV-Wnt-1 and p53-/- mice were enriched for MaSC-subset genes, whereas the gene profiles of MMTV-Neu and MMTV-PyMT tumors were most concordant with the luminal progenitor cell signature. Comparison of the mouse mammary epithelial cell signatures with their human counterparts revealed substantial conservation of genes, whereas IPA highlighted a number of conserved pathways in the three epithelial subsets.
CONCLUSIONS: The conservation of genes and pathways across species further validates the use of the mouse as a model to study mammary gland development and highlights pathways that are likely to govern cell-fate decisions and differentiation. It is noteworthy that many of the conserved genes in the MaSC population have been considered as epithelialmesenchymal transition (EMT) signature genes. Therefore, the expression of these genes in tumor cells may reflect basal epithelial cell characteristics and not necessarily cells that have undergone an EMT. Comparative analyses of normal mouse epithelial subsets with murine tumor models have implicated distinct cell types in contributing to tumorigenesis in the different models.
Figures available in online version.
Citation Information: Cancer Res 2010;70(24 Suppl):Abstract nr P4-04-03.
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Verma S, Verma LK, Gupta VK, Katoch VC, Dogra V, Pal B, Sharma M. Emerging Capripoxvirus Disease Outbreaks in Himachal Pradesh, a Northern State of India. Transbound Emerg Dis 2010; 58:79-85. [DOI: 10.1111/j.1865-1682.2010.01172.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bandyopadhyay S, Chakraborty D, Sarkar T, Pal B, Sasmal D, Biswas TK, Ghosh MK, Sarkar M. A serological survey of antibodies against bovine herpesvirus-1 in yak (Poephagus grunniens) in Arunachal Pradesh in India. REV SCI TECH OIE 2010; 28:1045-50. [PMID: 20462162 DOI: 10.20506/rst.28.3.1949] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Serum samples were collected from 254 yak (Poephagus grunniens, presently Bos grunniens) in different yak tracts of India. These samples were then screened by virus neutralisation test (VNT) and avidin-biotin enzyme-linked immunosorbent assay (AB-ELISA) to study the seroprevalence of antibodies against bovine herpesvirus type 1 (BHV-1). The overall seroprevalence in yak was found to be 41% (105) by VNT and AB-ELISA. The sex of the animal, whether it was on a farm or free-ranging and the location of the different yak tracts did not seem to have any effect on seroprevalence. However, seroprevalence was found to increase with the age of the animals, being highest in yak older than three years of age (49%). Yak generally share feeding, watering and grazing areas with other domestic and wild animals and this common ecological niche is thought to be a possible avenue of infection. This is the first time that the seroprevalence of antibodies against BHV-1 has been studied in yak in India.
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Pal B, Gupta S, New AM. A numerical study of failure mechanisms in the cemented resurfaced femur: effects of interface characteristics and bone remodelling. Proc Inst Mech Eng H 2009; 223:471-84. [PMID: 19499837 DOI: 10.1243/09544119jeim488] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Failure mechanisms of the resurfaced femoral head include femoral neck fracture in the short-term and stress shielding and implant loosening in the long-term. In this study, finite element simulations of the resurfaced femur considering a debonded implant-cement interface, variable stem-bone interface conditions, and bone remodelling were used to study load transfer within the resurfaced femur and to investigate its relationship with known failure mechanisms. Realistic three-dimensional finite element models of an intact and resurfaced femur were used. Various conditions at the interface between the stem of the prosthesis and the bone were considered. Loading conditions included normal walking and stair climbing. For all stem-bone contact conditions, the tensile stresses in the cement mantle varied between 1 MPa and 5.4 MPa, except near the distal rim of the resurfacing component where they reached 5.4-7MPa. In the case of full stem-bone contact, high von Mises stresses (114-121MPa) were generated in the implant at the stem-cup junction. These stresses were considerably reduced (maximum von Mises stress, 76 MPa) where a gap was present at the stem-bone interface. Resurfacing led to strain shielding of the bone of the femoral head (20-75 per cent strain reductions) and periprosthetic bone resorption (50-80 per cent bone density reductions) for all interface stem-bone contact conditions. In the lateral femoral head and the proximal femoral shaft around the trochantric region, bone density reductions varied between 10 per cent and 50 per cent. Bone apposition was observed in the inferior-medial part of the femoral head and proximal femoral neck region. For full stem-bone contact, more load was transferred through the stem to the surrounding bone, exacerbating strain shielding. Although femoral hip resurfacing conserves bone stock at the primary operation, strain shielding and periprosthetic bone resorption might lead to eventual loosening over time. Post-operatively, the resurfacing procedure generated elevated strains (0.50-0.75 per cent strain) in the proximal femoral neck-component junction irrespective of the variation in interface conditions, indicating an initial risk of femoral neck fracture. Subsequent to bone remodelling, this strain concentration was considerably reduced (0.35-0.50 per cent strain), lowering the risk of neck fracture. In order to reduce the potential risk of neck fracture, patients should avoid activities which might induce high loading of the hip during the early post-operative period to allow the bone around the proximal femoral neck to remodel and heal.
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Merryfield WJ, Pal B, Foreman MGG. Projected future changes in surface marine winds off the west coast of Canada. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jc005123] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lim E, Vaillant F, Wu D, Forrest N, Pal B, Gyorki D, Smyth GK, Visvader J, Lindeman G. Investigation of human mammary stem and progenitor subpopulations from BRCA1 mutation carriers and noncarriers. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
504 Background: We have previously isolated discrete populations of mouse mammary epithelial cells (MECs) and defined a population that expresses ‘basal’ markers and is highly enriched for mammary stem cells. This subset was ‘triple negative’ for ER, PR and ErbB2 expression and is reminiscent of the basal subtype of breast cancer, suggesting that the mammary stem cell may be the ‘cell of origin’ for this poor prognosis group. Since tumors arising in BRCA1 mutation carriers often exhibit a ‘basal’ phenotype, we hypothesized that the mammary stem cell pool is aberrant in these women. Our objective was to define the human MEC hierarchy and evaluate the functional characteristics of MECs from BRCA1± and normal breast tissue. Methods: Single cell suspensions prepared from fresh human BRCA1± and normal breast tissue were sorted by flow cytometry. Hematopoietic (CD45+, CD235a+) and endothelial (CD31+) cells were removed, and the remaining viable ‘lineage minus’ (Lin-) MECs fractionated based on cell surface markers. These subpopulations were evaluated by immunostaining, RNA profiling, in vitro culture in Matrigel and in vivo xenotransplantation into ‘humanised’ mammary fat pads of immunocompromised mice. Results: Lin- cells fractionated with α6-integrin (CD49f) and epithelial cell adhesion molecule (EpCAM) revealed three discrete MEC subpopulations. A stem/progenitor population that preferentially yields breast outgrowths in vivo has been identified. These subpopulations gave rise in vitro to colonies that were either large and heterogenous or small and homogenous. Only the latter differentiated into milk-producing cells when exposed to lactogenic stimuli. Immunostaining confirmed their origins from myoepithelial and luminal progenitor cells respectively. Intriguingly, BRCA1± MECs exhibited perturbed in vitro growth properties when compared to normal controls. Conclusions: Our studies provide evidence for a human MEC hierarchy, a model to interrogate the perturbation noted in pre-neoplastic tissue derived from BRCA1 mutation carriers and the identification of the cell of transformation in BRCA1 associated breast cancer. These findings may have implications on developing prevention strategies for hereditary breast cancer. No significant financial relationships to disclose.
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Al-Maskari A, O'grady A, Pal B, McKibbin M. Phenotypic progression in X-linked retinitis pigmentosa secondary to a novel mutation in the RPGR gene. Eye (Lond) 2009; 23:519-21. [PMID: 19218993 DOI: 10.1038/eye.2008.427] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To report phenotypic progression for a novel mutation in the RPGRgene causing X-linked retinitis pigmentosa (RP), and describe the phenotype in affected males and females. METHODS Bidirectional fluorescent sequencing analysis was used to screen for mutations in RPGR. Five affected males and eight affected females from two English families underwent refraction, ETDRS visual acuity, OCT imaging, and Goldmann visual field testing. RESULTS DNA analysis identified a novel c.350G>A sequence change in exon 5 of RPGR. The change segregated with disease in both families. For affected males there was a significant correlation between age and visual acuity (r=-0.91, P=0.034), and a non-significant correlation between age and visual field area (r=-0.56, P=0.4). For affected females, there was a significant correlation between age and visual acuity (r=-0.8, P=0.018), and between age and visual field area (r=-0.94, P=0.005). All affected females were highly myopic. No correlation between retinal thickness, and either age or sex was noted. CONCLUSION This novel mutation in RPGRcauses X-Linked RP with complete penetrance in males and females. Affected females are highly myopic but retain better visual function than affected males. The phenotypic data can be used to provide a mutation-specific visual prognosis, and may also help recognition of the genotype.
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Ho P, Bhatti W, Pal B. West J Med 2008; 337:a1153-a1153. [DOI: 10.1136/bmj.a1153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Pal B, Mohamed MD, Keen TJ, Williams GA, Bradbury JA, Sheridan E, Inglehearn CF. A new phenotype of recessively inherited foveal hypoplasia and anterior segment dysgenesis maps to a locus on chromosome 16q23.2-24.2. J Med Genet 2005; 41:772-7. [PMID: 15466012 PMCID: PMC1735603 DOI: 10.1136/jmg.2004.020040] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Pal B. Inflammatory rheumatic disorders. Ann Rheum Dis 2004; 63:611; author reply 611. [PMID: 15082507 PMCID: PMC1754997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
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Pye SR, Adams KR, Halsey JP, Klimiuk P, Knight SM, Pal B, Selby PL, Stewart IM, Swinson DR, O'Neill TW. Frequency and causes of osteoporosis in men. Rheumatology (Oxford) 2003; 42:811-2. [PMID: 12771448 DOI: 10.1093/rheumatology/keg208] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Pal B. Photocatalytic redox-combined synthesis of ?-pipecolinic acid from ?-lysine by suspended titania particles: effect of noble metal loading on the selectivity and optical purity of the product. J Catal 2003. [DOI: 10.1016/s0021-9517(03)00049-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Pal B. The doctor will text you now: is there a role for the mobile telephone in health care? BMJ : BRITISH MEDICAL JOURNAL 2003. [DOI: 10.1136/bmj.326.7389.607] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Medda S, Jaisankar P, Manna RK, Pal B, Giri VS, Basu MK. Phospholipid microspheres: a novel delivery mode for targeting antileishmanial agent in experimental leishmaniasis. J Drug Target 2003; 11:123-8. [PMID: 12881199 DOI: 10.1080/1061186031000119101] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Novel phospholipid microspheres were prepared from polylactic-co-glycolic acid (PLGA) and phosphatidyl ethanol amine in the molar ratio 1:71, to deliver drugs to macrophages in experimental leishmaniasis. Liposomes, well known as drug carrier systems, made from phosphatidylethanolamine, cholesterol and dicetyl phosphate in the molar ratio 7:2:1, were used as control, in order to compare the efficacies of the two carriers. As such, the membrane fluidity of the two carriers was kept at comparable levels by adjusting chemical composition. Moreover, because of the presence of mannosyl fucosyl receptors on macrophages, attempts were made to target an optically active synthetic compound dihydroindolo [2,3-a] indolizine, an antileishmanial agent, intercalated in both mannose-grafted liposomes and mannose-grafted microspheres. When tested for efficacy in lowering parasite load in the spleen, as well as in reducing the hepatic and renal changes associated with infection, the drug intercalated mannose-grafted microspheres were found to be the most active in comparison to drug intercalated liposomes or to the free drug. Thus, mannose-grafted microspheres may have possible application in the clinics not only in visceral leishmaniasis, but also in other macrophage-associated disorders.
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Schormann N, Pal B, Chattopadhyay D. Expression, purification, crystallization and preliminary crystallographic analysis of recombinant pteridine reductase of Trypanosoma cruzi. ACTA CRYSTALLOGRAPHICA SECTION D: BIOLOGICAL CRYSTALLOGRAPHY 2001; 57:1671-3. [PMID: 11679740 DOI: 10.1107/s0907444901012094] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2001] [Accepted: 07/17/2001] [Indexed: 11/10/2022]
Abstract
The recombinant version of Trypanosoma cruzi pteridine reductase was expressed in Escherichia coli, purified to homogeneity from the soluble fraction of bacterial extract by metal-chelate affinity chromatography and crystallized in the presence of the cofactor (NADPH) and an inhibitor (methotrexate) at 295 K using sodium acetate as precipitant. The crystals are trigonal, belonging to space group P3(1) (or P3(2)), with unit-cell parameters a = 74.35, c = 179.96 A under cryogenic conditions. The asymmetric unit contains a tetramer, with a corresponding V(M) of 2.3 A(3) Da(-1)and a solvent content of 46%. Native data have been collected to 2.1 A resolution using Cu Kalpha X-rays.
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Sinha S, Murugesan T, Maiti K, Gayen JR, Pal B, Pal M, Saha BP. Antibacterial activity of Bergenia ciliata rhizome. Fitoterapia 2001; 72:550-2. [PMID: 11429252 DOI: 10.1016/s0367-326x(00)00322-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The methanol extract of Bergenia ciliata (tested at 200--1000 microg/disc) showed a wide spectrum of concentration-dependent antibacterial activity.
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Pal B, Morris J. Perceived risks of joint infection following intra-articular corticosteroid injections: a survey of rheumatologists. Clin Rheumatol 2001; 18:264-5. [PMID: 11206357 DOI: 10.1007/s100670050098] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
There are no clear published data on the risks of bacterial arthritis following intra-articular corticosteroid injections. Forty rheumatologists were given a detailed questionnaire; 32 (response 80%) completed questionnaires were analysed. On the basis of recalled cases of post-injection joint infection we estimate this risk to be low, at 4.6/100,000 injections.
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Pal B. Tele-rheumatology: telephone follow up and cyberclinic. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2001; 64:189-195. [PMID: 11226616 DOI: 10.1016/s0169-2607(00)00138-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This paper reviews here the main practical applications of telemedicine with particular reference to telephone care by health professionals to patients. A pilot project of out-patient telephone follow-up service for continuity of ambulatory rheumatology patients is described and recommendations are provided for those keen to develop such a service. In a later section newer technologies such as the potential practical applications of the internet and e-mail are described with the setting up of a cyber project for rheumatology and osteoporosis patients. It is noted that despite enthusiasm and development of such new projects, conventional clinicians need further longer term observation to grasp the advantages and pitfalls before more widespread use of telemedicine becomes commonplace.
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Pal B, Quennell P, Hawes S. A review of accident and emergency attendances for non-traumatic musculo-skeletal complaints. Rheumatol Int 2001; 19:171-5. [PMID: 10984134 DOI: 10.1007/s002960000042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
As there have been no previous studies, we undertook a systematic review to determine the number and nature of musculo-skeletal complaints presenting to casualty departments, review the appropriateness of treatment and referrals to other departments and also to identify potential problem areas so as to address these. Over the review period of 40 non-consecutive days, the total attendance was 2863 patients of which 85 (2.97%) presented with musculo-skeletal complaints. The majority (691) were in the age group of 20-59 years. Most complaints were in the back (26), neck (11), chest (10), shoulder (8), knee (8). Main complaints were pain (78), tenderness (10), swelling (9), stiffness (9), reduced movements (8) or a combination thereof; the rest were miscellaneous, e.g. pyrexia, headache and paraesthesia. The majority had a duration of symptoms from 1 to 7 days. Investigations at the casualty department were radiographs (29), full blood count (6), biochemistry (6), erythrocyte sedimentation rate (ESR) (1), blood culture (1), electrocardiogram (ECG) (7), and joint aspiration (2). Advice was sought from orthopaedic (2), rheumatology or general medicine (0), or other departments (2). Casualty diagnoses were mainly non-inflammatory conditions. Treatment given included analgesics/non-steroidal inflammatory drugs (NSAIDs) (44), splints and slings (5), Tubigrip (6), and collars (5). Only two patients (2.4%) were admitted. We were pleasantly surprised to note very small numbers of patients with inflammatory conditions, possibly indicating previous optimal management in our locality. A surprising finding was the lack of any attendance with gout. More direct referrals to orthopaedic or rheumatology departments would be appropriate in some instances. As a result of this review, we decided to offer short courses on musculo-skeletal medicine for new casualty officers and we have also produced guidelines/algorithm for management which would be equally useful for general practitioners.
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Escardó JA, Pal B, Feyi-Waboso A, Lane CM, Morgan JE. Orbital cellulitis caused by Fusobacterium necrophorum. Am J Ophthalmol 2001; 131:280-1. [PMID: 11228318 DOI: 10.1016/s0002-9394(00)00777-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PURPOSE To report the case of a previously healthy young female who developed orbital cellulitis caused by Fusobacterium necrophorum. We are unaware of previous reports of this condition caused by the same anaerobic, gram-negative, nonsporeforming bacterium and could find no reference to it in a computer search using MEDLINE. METHODS Case report. RESULTS In the case of orbital cellulitis presented here, the patient required 3 sinus debridement operations and 30 days of intravenous antibiotics. Despite this, her vision did not fully recover. CONCLUSION F. necrophorum is capable of causing severe orbital disease that requires aggressive and prompt treatment to preserve sight.
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Sen Gupta KK, Pal B, Begum BA. Reactivity of some sugars and sugar phosphates towards gold(III) in sodium acetate-acetic acid buffer medium. Carbohydr Res 2001; 330:115-23. [PMID: 11217954 DOI: 10.1016/s0008-6215(00)00181-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The kinetics of the oxidation of some aldoses and aldose phosphates have been studied spectrophotometrically in sodium acetate-acetic acid buffer medium at different temperatures. The reactions are first order with respect to [Au(III)] and [substrate]. Both H+ and Cl- ions retard the reaction. The reactions appear to involve different gold(III) species, viz. AuCl4-, AuCl3(OH2) and AuCl3(OH)- . The results are interpreted in terms of the probable intermediate formation of free radicals and Au(II). Aldoses react with gold(III) in the order: triose > tetrose > pentose > hexose. The sugar phosphates react with gold(III) at a faster rate than the parent sugars except glucose-1-phosphate, which reacts at slower rates than glucose. A tentative reaction mechanism leading to the formation of products has been suggested.
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Panthakalam S, Pal B. Key developments in rheumatology. THE PRACTITIONER 2000; 244:1024-6, 1029-32. [PMID: 11220170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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Pal B, Bajpai PK, Basu Baul TS. Binding of 5-(2'-carboxyphenyl)azoquinolin-8-ol to bovine serum albumin: a spectroscopic study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2000; 56A:2453-2458. [PMID: 11075687 DOI: 10.1016/s1386-1425(00)00320-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Dye-protein interactions are of immense importance in dye-ligand chromatography of protein purification. In this type of interactions, the structure of the dye molecules has a significant role. However, studies on the structure of these ligands are scanty. Therefore, we have spectroscopically investigated interactions of three 5-(aryl)azoquinolin-8-ol derivatives, which could be used as potent chelate forming agents, with bovine serum albumin (BSA). Among these, the carboxy derivative, 5-(2'-carboxyphenyl)azoquinolin-8-ol (CPAQ) has been selected for resonance Raman study. It has been shown that BSA has six independent binding sites for CPAQ at pH 7.2, the binding constant being 6.2 x 10(3) M(-1). Assignments of Raman modes of bound CPAQ are also presented. It has also been shown that bound CPAQ exists exclusively in hydrazone form. Results further demonstrate that the azo group nitrogen adjacent to the phenyl ring probably participated in the formation of a BSA-CPAQ complex.
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