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  1. Article ; Online: Light chain restriction confined to lower portions of cutaneous lymphocytic proliferations: a potential diagnostic pitfall.

    Hardin, Justin C / Barrows, Brad / Duff, James I / Wasko, Carina A / Orengo, Ida / Perri, Anthony / Huttenbach, Yve T / Diwan, A H

    Journal of cutaneous pathology

    2014  Volume 41, Issue 12, Page(s) 978–980

    MeSH term(s) Aged ; Aged, 80 and over ; Diagnosis, Differential ; Female ; Humans ; Immunoglobulin Light Chains/metabolism ; Leukemia, Lymphocytic, Chronic, B-Cell/diagnosis ; Leukemia, Lymphocytic, Chronic, B-Cell/immunology ; Leukemia, Lymphocytic, Chronic, B-Cell/pathology ; Lymphoma, B-Cell, Marginal Zone/diagnosis ; Lymphoma, B-Cell, Marginal Zone/immunology ; Lymphoma, B-Cell, Marginal Zone/pathology ; Male ; Skin Neoplasms/immunology ; Skin Neoplasms/pathology
    Chemical Substances Immunoglobulin Light Chains
    Language English
    Publishing date 2014-12
    Publishing country United States
    Document type Case Reports ; Letter
    ZDB-ID 187078-6
    ISSN 1600-0560 ; 0303-6987
    ISSN (online) 1600-0560
    ISSN 0303-6987
    DOI 10.1111/cup.12404
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Promotion of melanoma growth by the metabolic hormone leptin.

    Ellerhorst, Julie A / Diwan, A H / Dang, Shyam M / Uffort, Deon G / Johnson, Marilyn K / Cooke, Carolyn P / Grimm, Elizabeth A

    Oncology reports

    2010  Volume 23, Issue 4, Page(s) 901–907

    Abstract: We have previously shown that melanoma cells proliferate in response to the metabolic hormones TRH and TSH. The objective of the present study was to test the hypothesis that a third metabolic hormone, leptin, serves as a growth factor for melanoma. ... ...

    Abstract We have previously shown that melanoma cells proliferate in response to the metabolic hormones TRH and TSH. The objective of the present study was to test the hypothesis that a third metabolic hormone, leptin, serves as a growth factor for melanoma. Using western blotting, indirect immunofluorescence, and RT-PCR, leptin receptors were found to be expressed by human melanoma cells. In contrast, cultured melanocytes expressed message for the receptor without detectable protein. Melanoma cells responded to treatment with leptin by activating the MAPK pathway and proliferating. Melanoma cells but not melanocytes, also expressed leptin protein, creating a potential autocrine loop. Examination of human melanoma tumors by immunohistochemistry revealed that melanomas and nevi expressed leptin at a high frequency. Melanomas also strongly expressed the leptin receptor, whereas nevi expressed this receptor to a much lesser degree. We conclude that leptin is a melanoma growth factor and that a leptin autocrine-loop may contribute to the uncontrolled proliferation of these cells.
    MeSH term(s) Blotting, Western ; Cell Line, Tumor ; Cell Proliferation ; Fluorescent Antibody Technique ; Humans ; Immunohistochemistry ; Intercellular Signaling Peptides and Proteins/metabolism ; Leptin/metabolism ; Melanoma/metabolism ; Melanoma/pathology ; Mitogen-Activated Protein Kinases/metabolism ; Nevus/metabolism ; Receptors, Leptin/metabolism ; Reverse Transcriptase Polymerase Chain Reaction ; Signal Transduction/physiology ; Skin Neoplasms/metabolism ; Skin Neoplasms/pathology
    Chemical Substances Intercellular Signaling Peptides and Proteins ; Leptin ; Receptors, Leptin ; Mitogen-Activated Protein Kinases (EC 2.7.11.24)
    Language English
    Publishing date 2010-03-04
    Publishing country Greece
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1222484-4
    ISSN 1791-2431 ; 1021-335X
    ISSN (online) 1791-2431
    ISSN 1021-335X
    DOI 10.3892/or_00000713
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Cutaneous toxoplasmosis: a case of confounding diagnosis.

    Lee, S A / Diwan, A H / Cohn, M / Champlin, R / Safdar, A

    Bone marrow transplantation

    2005  Volume 36, Issue 5, Page(s) 465–466

    MeSH term(s) Adult ; Bone Marrow Transplantation ; Humans ; Male ; Precursor Cell Lymphoblastic Leukemia-Lymphoma/parasitology ; Precursor Cell Lymphoblastic Leukemia-Lymphoma/pathology ; Precursor Cell Lymphoblastic Leukemia-Lymphoma/therapy ; Skin Diseases, Parasitic/diagnosis ; Skin Diseases, Parasitic/etiology ; Skin Diseases, Parasitic/pathology ; Toxoplasmosis/diagnosis ; Toxoplasmosis/etiology ; Toxoplasmosis/pathology
    Language English
    Publishing date 2005-09
    Publishing country England
    Document type Case Reports ; Letter
    ZDB-ID 632854-4
    ISSN 1476-5365 ; 0268-3369 ; 0951-3078
    ISSN (online) 1476-5365
    ISSN 0268-3369 ; 0951-3078
    DOI 10.1038/sj.bmt.1705079
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Nuchal-type fibroma in two related patients with Gardner's syndrome.

    Diwan, A H / Graves, E D / King, J A / Horenstein, M G

    The American journal of surgical pathology

    2000  Volume 24, Issue 11, Page(s) 1563–1567

    Abstract: Nuchal-type fibroma is a distinct subcutaneous and dermal fibrous tissue proliferation that has been previously definitely identified in one patient with Gardner's syndrome and has been possibly present in two others. Gardner's syndrome is an autosomal- ... ...

    Abstract Nuchal-type fibroma is a distinct subcutaneous and dermal fibrous tissue proliferation that has been previously definitely identified in one patient with Gardner's syndrome and has been possibly present in two others. Gardner's syndrome is an autosomal-dominant condition with variable expressivity that comprises epidermoid cysts, fibrous tumors, osteomas, intestinal polyposis, as well as other findings. We report two cases of nuchal-type fibroma presenting in a 13-year-old boy in the right upper back and in his 60-year-old grandfather in the upper chest at the posterior axillary line. Both individuals carried a diagnosis of Gardner's syndrome and neither of them had diabetes. Although the boy has as of now only presented with cutaneous manifestations of Gardner's syndrome, his grandfather has exhibited both cutaneous and intestinal evidence of this syndrome. In addition, the boy's mother and her sister have documented Gardner's syndrome. Light microscopic findings of nuchal-type fibroma from both patients include paucicellular, haphazardly arranged collagen bundles with entrapped adipose tissue. A marked diminution of elastic fibers was noted with Van-Gieson stains. The lesions were diffusely positive for CD34 and contained a few factor XIIIa-positive cells. Electron microscopic analysis revealed no differences between the collagen comprising the nuchal-type fibroma as compared with control dermal collagen obtained from skin away from the tumor. These cases strengthen the view that there is an association between nuchal-type fibroma and Gardner's syndrome.
    MeSH term(s) Adolescent ; Antigens, CD34/analysis ; Female ; Fibroma/chemistry ; Fibroma/etiology ; Fibroma/pathology ; Fluorescent Antibody Technique, Indirect ; Gardner Syndrome/complications ; Gardner Syndrome/metabolism ; Gardner Syndrome/pathology ; Genetic Diseases, Inborn ; Humans ; Male ; Middle Aged ; Neck ; Pedigree ; Soft Tissue Neoplasms/chemistry ; Soft Tissue Neoplasms/etiology ; Soft Tissue Neoplasms/pathology ; Transglutaminases/analysis
    Chemical Substances Antigens, CD34 ; Transglutaminases (EC 2.3.2.13)
    Language English
    Publishing date 2000-11
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 752964-8
    ISSN 1532-0979 ; 0147-5185
    ISSN (online) 1532-0979
    ISSN 0147-5185
    DOI 10.1097/00000478-200011000-00015
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Cyclic GMP-dependent protein kinase activity in rat pulmonary microvascular endothelial cells.

    Diwan, A H / Thompson, W J / Lee, A K / Strada, S J

    Biochemical and biophysical research communications

    1994  Volume 202, Issue 2, Page(s) 728–735

    Abstract: Cyclic GMP-dependent protein kinase (cGPK) activity was determined in rat pulmonary microvascular endothelial cells (RPMVEC) using cGMP-stimulated phosphorylation of BPDEtide and histone F2B substrates in the presence of PKI [peptide inhibitor of cAMP- ... ...

    Abstract Cyclic GMP-dependent protein kinase (cGPK) activity was determined in rat pulmonary microvascular endothelial cells (RPMVEC) using cGMP-stimulated phosphorylation of BPDEtide and histone F2B substrates in the presence of PKI [peptide inhibitor of cAMP-dependent protein kinase (cAPK)]. RPMVEC cGPK activity was localized to the 100,000 x g cytosolic fraction. The EC50 for cGMP activation in the presence of PKI was 0.16 microM and H-89 inhibition under similar conditions showed an IC50 value of 0.16 microM. Anion-exchange chromatography of RPMVEC and rat lung cytosolic fractions showed separation of the cGMP-dependent from the cGMP-independent protein kinase activity and similar elution conductivities. Further, Western blots of RPMVEC active DEAE-Trisacryl fractions showed immunoreactivity using bovine Type I cGPK antiserum. Preliminary studies reveal six potential substrates phosphorylated by cGPK in RPMVEC. These studies describe an endothelial cell (EC) cGMP-receptor, cGPK, in addition to cGMP-activated (Type II) phosphodiesterase (PDE).
    MeSH term(s) Amino Acid Sequence ; Animals ; Anions ; Blotting, Western ; Chromatography, Ion Exchange ; Cyclic GMP/pharmacology ; Cytosol/enzymology ; Endothelium, Vascular/enzymology ; Lung/blood supply ; Microcirculation/enzymology ; Molecular Sequence Data ; Phosphorylation ; Protein Kinase Inhibitors ; Protein Kinases/metabolism ; Rats ; Sodium Chloride ; Substrate Specificity
    Chemical Substances Anions ; Protein Kinase Inhibitors ; Sodium Chloride (451W47IQ8X) ; Protein Kinases (EC 2.7.-) ; Cyclic GMP (H2D2X058MU)
    Language English
    Publishing date 1994-07-29
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, P.H.S.
    ZDB-ID 205723-2
    ISSN 0006-291X ; 0006-291X
    ISSN (online) 0006-291X
    ISSN 0006-291X
    DOI 10.1006/bbrc.1994.1991
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  6. Article: Pulmonary microvascular and macrovascular endothelial cells: differential regulation of Ca2+ and permeability.

    Kelly, J J / Moore, T M / Babal, P / Diwan, A H / Stevens, T / Thompson, W J

    The American journal of physiology

    1998  Volume 274, Issue 5, Page(s) L810–9

    Abstract: Cytosolic Ca2+ concentration ([Ca2+]i) plays an important role in control of pulmonary vascular endothelial cell (ECs) barrier function. In this study, we investigated whether thapsigargin- and ionomycin-induced changes in cytosolic Ca2+ induce ... ...

    Abstract Cytosolic Ca2+ concentration ([Ca2+]i) plays an important role in control of pulmonary vascular endothelial cell (ECs) barrier function. In this study, we investigated whether thapsigargin- and ionomycin-induced changes in cytosolic Ca2+ induce permeability in rat pulmonary microvascular (RPMV) versus macrovascular (RPA) ECs. In Transwell cultures, RPMVECs formed a tighter, more restrictive barrier than RPAECs to 12,000-, 72,000-, and 150,000-molecular-weight FITC-labeled dextrans. Thapsigargin (1 microM) produced higher [Ca2+]i levels in RPAECs than in RPMVECs and increased permeability in RPAEC but not in RPMVEC monolayers. Due to the attenuated [Ca2+]i response in RPMVECs, we investigated whether reduced activation of store-operated Ca2+ entry was responsible for the insensitivity to thapsigargin. Addition of the drug in media containing 100 nM extracellular Ca2+ followed by readdition media with 2 mM extracellular Ca2+ increased RPMVEC [Ca2+]i to a level higher than that in RPAECs. Under these conditions, RPMVEC permeability was not increased, suggesting that [Ca2+]i in RPMVECs does not initiate barrier disruption. Also, ionomycin (1.4 microM) did not alter RPMVEC permeability, but the protein phosphatase inhibitor calyculin A (100 nM) induced permeability in RPMVECs. These data indicate that, whereas increased [Ca2+]i promotes permeability in RPAECs, it is not sufficient in RPMVECs, which show an apparent uncoupling of [Ca2+]i signaling pathways or dominant Ca(2+)-independent mechanisms from controlling cellular gap formation and permeability.
    MeSH term(s) Animals ; Calcium/metabolism ; Capillary Permeability/drug effects ; Capillary Permeability/physiology ; Cells, Cultured ; Endothelium, Vascular/cytology ; Endothelium, Vascular/metabolism ; Extracellular Space/metabolism ; Male ; Microcirculation/physiology ; Pulmonary Artery/cytology ; Pulmonary Artery/metabolism ; Pulmonary Circulation/drug effects ; Pulmonary Circulation/physiology ; Rats ; Rats, Sprague-Dawley ; Thapsigargin/pharmacology
    Chemical Substances Thapsigargin (67526-95-8) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 1998
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, P.H.S.
    ZDB-ID 2948-8
    ISSN 0002-9513
    ISSN 0002-9513
    DOI 10.1152/ajplung.1998.274.5.L810
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Inhibition of serine-threonine protein phosphatases decreases barrier function of rat pulmonary microvascular endothelial cells.

    Diwan, A H / Honkanen, R E / Schaeffer, R C / Strada, S J / Thompson, W J

    Journal of cellular physiology

    1997  Volume 171, Issue 3, Page(s) 259–270

    Abstract: The flux of multisized fluorescein-isothiocyanate-labeled hydroxy ethyl starch (FITC-HES) macromolecules was used to assess changes in barrier function of rat pulmonary microvascular endothelial cell (RPMVEC) monolayers exposed to protein phosphatase (PP) ...

    Abstract The flux of multisized fluorescein-isothiocyanate-labeled hydroxy ethyl starch (FITC-HES) macromolecules was used to assess changes in barrier function of rat pulmonary microvascular endothelial cell (RPMVEC) monolayers exposed to protein phosphatase (PP) inhibitors or cGMP analogs and atriopeptin (ANF). Two potent PP inhibitors, calyculin A (CalA) and okadaic acid (OA), increased RPMVEC permeability in a dose- and time-dependent manner, and CalA had a higher intrinsic activity than OA. In contrast, ANF and potent cGMP analogs had no effect on basal RPMVEC permeability. The phosphohistone PP activity contained in RPMVEC sonicates was inhibited by OA with an inhibition profile that suggested at least two components were present, with PP2A accounting for approximately 70% of the OA-inhibitable phosphohistone phosphatase activity. Following separation with heparin-Sepharose chromatography, PP activity exhibited equipotent inhibition by CalA and differential inhibition by OA. Differential inhibition of PP1 and PP2A by OA suggested that PP1 is involved in regulating RPMVEC barrier function. Permeabilized RPMVEC showed increased phosphorylation of several proteins in the presence of phosphatase inhibitors. Treatment with KT 5926, a myosin light chain (MLC) kinase (MLCK) inhibitor, or rolipram, a phosphodiesterase inhibitor, decreased 32P incorporation into immunoprecipitated MLC by CalA and OA. However, this effect did not abolish either the CalA- or OA-induced decrease in the RPMVEC barrier function. Localization of filamentous (F) actin was at the periphery as well as in the cytoplasm and perinuclear region, whereas nonmuscle myosin was seen in the perinuclear region. Neither of these patterns was changed in the presence of CalA. Thus, cGMP does not alter RPMVEC permeability, but inhibition of PP activity results in loss of barrier function by a mechanism independent from MLC phosphorylation.
    MeSH term(s) Animals ; Cyclic GMP/pharmacology ; Endothelium, Vascular/cytology ; Endothelium, Vascular/physiology ; Enzyme Inhibitors/pharmacology ; Intercellular Junctions/drug effects ; Lung/blood supply ; Microcirculation ; Okadaic Acid/pharmacology ; Oxazoles/pharmacology ; Phosphoprotein Phosphatases/antagonists & inhibitors ; Phosphoprotein Phosphatases/physiology ; Rats
    Chemical Substances Enzyme Inhibitors ; Oxazoles ; Okadaic Acid (1W21G5Q4N2) ; calyculin A (7D07U14TK3) ; Phosphoprotein Phosphatases (EC 3.1.3.16) ; Cyclic GMP (H2D2X058MU)
    Language English
    Publishing date 1997-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, P.H.S.
    ZDB-ID 3116-1
    ISSN 1097-4652 ; 0021-9541
    ISSN (online) 1097-4652
    ISSN 0021-9541
    DOI 10.1002/(SICI)1097-4652(199706)171:3<259::AID-JCP4>3.0.CO;2-N
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Phase II trial of imatinib mesylate in patients with metastatic melanoma.

    Kim, K B / Eton, O / Davis, D W / Frazier, M L / McConkey, D J / Diwan, A H / Papadopoulos, N E / Bedikian, A Y / Camacho, L H / Ross, M I / Cormier, J N / Gershenwald, J E / Lee, J E / Mansfield, P F / Billings, L A / Ng, C S / Charnsangavej, C / Bar-Eli, M / Johnson, M M /
    Murgo, A J / Prieto, V G

    British journal of cancer

    2008  Volume 99, Issue 5, Page(s) 734–740

    Abstract: Metastatic melanoma cells express a number of protein tyrosine kinases (PTKs) that are considered to be targets for imatinib. We conducted a phase II trial of imatinib in patients with metastatic melanoma expressing at least one of these PTKs. Twenty-one ...

    Abstract Metastatic melanoma cells express a number of protein tyrosine kinases (PTKs) that are considered to be targets for imatinib. We conducted a phase II trial of imatinib in patients with metastatic melanoma expressing at least one of these PTKs. Twenty-one patients whose tumours expressed at least one PTK (c-kit, platelet-derived growth factor receptors, c-abl, or abl-related gene) were treated with 400 mg of imatinib twice daily. One patient with metastatic acral lentiginous melanoma, containing the highest c-kit expression among all patients, had dramatic improvement on positron emission tomographic scan at 6 weeks and had a partial response lasting 12.8 months. The responder had a substantial increase in tumour and endothelial cell apoptosis at 2 weeks of treatment. Imatinib was fairly well tolerated: no patient required treatment discontinuation because of toxicity. Fatigue and oedema were the only grade 3 or 4 toxicities that occurred in more than 10% of the patients. Imatinib at the studied dose had minimal clinical efficacy as a single-agent therapy for metastatic melanoma. However, based on the characteristics of the responding tumour in our study, clinical activity of imatinib, specifically in patients with melanoma with certain c-kit aberrations, should be examined.
    MeSH term(s) Adult ; Aged ; Aged, 80 and over ; Antineoplastic Agents/adverse effects ; Antineoplastic Agents/therapeutic use ; Base Sequence ; Benzamides ; DNA Primers ; Disease Progression ; Female ; Humans ; Imatinib Mesylate ; Male ; Melanoma/blood supply ; Melanoma/diagnostic imaging ; Melanoma/drug therapy ; Melanoma/secondary ; Middle Aged ; Piperazines/adverse effects ; Piperazines/therapeutic use ; Positron-Emission Tomography ; Pyrimidines/adverse effects ; Pyrimidines/therapeutic use ; Skin Neoplasms/blood supply ; Skin Neoplasms/diagnostic imaging ; Skin Neoplasms/drug therapy ; Skin Neoplasms/pathology ; Treatment Outcome
    Chemical Substances Antineoplastic Agents ; Benzamides ; DNA Primers ; Piperazines ; Pyrimidines ; Imatinib Mesylate (8A1O1M485B)
    Language English
    Publishing date 2008-08-19
    Publishing country England
    Document type Clinical Trial, Phase II ; Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 80075-2
    ISSN 1532-1827 ; 0007-0920
    ISSN (online) 1532-1827
    ISSN 0007-0920
    DOI 10.1038/sj.bjc.6604482
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