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  • 1
    Online Resource
    Online Resource
    New York, NY :Springer,
    Keywords: Embryology. ; Electronic books.
    Description / Table of Contents: This comprehensive assessment of our present knowledge of the role of notch signaling in embryology and cancer analyzes a range of topics from the latest findings in cellular and molecular pathology to new concepts for prophylaxis and treatment of cancer.
    Type of Medium: Online Resource
    Pages: 1 online resource (346 pages)
    Edition: 1st ed.
    ISBN: 9781461408994
    Series Statement: Advances in Experimental Medicine and Biology Series ; v.727
    DDC: 571.7/4
    Language: English
    Note: Intro -- Title Page -- Copyright Page -- DEDICATION -- PREFACE -- ABOUT THE EDITORS... -- PARTICIPANTS -- Table of Contents -- CHAPTER 1 THE MOLECULAR BASIS OF NOTCH SIGNALING: A Brief Overview -- INTRODUCTION -- BASIC MECHANISMS OF NOTCH SIGNALING PATHWAYS -- MODULATION OF NOTCH SIGNAL TRANSDUCTION -- NOTCH SIGNALING IN VASCULAR DEVELOPMENT -- NOTCH SIGNALING IN CANCER DEVELOPMENT -- NOTCH IN SOLID TUMORS -- NOTCH SIGNALING IN EMBRYONIC DEVELOPMENT -- ORIGINS OF ROLES FOR NOTCH SIGNALING IN EARLY EMBRYOGENESIS -- NOTCH SIGNALING IS OFTEN INVOLVED IN MESODERM FORMATION -- CONCLUSION -- REFERENCES -- CHAPTER 2 THE ROLE OF ADAMS IN NOTCH SIGNALING -- INTRODUCTION -- NOTCH SIGNALING -- NOTCH PROTEOLYSIS SITE-1 (S1, FURIN, SERINE PROTEASE) -- SITE-2 (S2, ADAM10, METALLOPROTEASE) -- SITE-3 (S3, PRESENILIN, ASPARTYL PROTEASE) -- THE ADAM FAMILY OF PROTEASES -- NOTCH RECEPTOR CLEAVAGE BY ADAMs -- NOTCH LIGAND CLEAVAGE BY ADAMS -- NOTCH S2-PROTECTION FROM RIP -- SUBSTRATE REQUIREMENTS FOR S2 -- LOCATION OF S2 CLEAVAGE -- TARGETING S2 PROTEOLYSIS IN CANCER -- CONCLUSION -- WEB LINKS -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 3 METABOLISM AND TRANSPORTATION PATHWAYS OF GDP-FUCOSE THAT ARE REQUIRED FOR THE O-FUCOSYLATION OF NOTCH -- INTRODUCTION -- PROPER STRUCTURE OF ITS EXTRACELLULAR DOMAIN IS CRUCIAL FOR THE ACTIVATION OF NOTCH -- MODIFICATIONS OF O-LINKED GLYCANS IN THE EGF-LIKE REPEATS OF NOTCH -- THE MONOSACCHARIDE O-FUCOSE MODIFICATION ON THE EGF-LIKE REPEATS OF NOTCH DOES NOT HAVE A MAJOR ROLE IN NOTCH SIGNALING -- METABOLIC PATHWAY FOR THE O-FUCOSE MODIFICATION OF NOTCH EGF-LIKE REPEATS -- INTRACELLULAR TRANSPORTATION OF GDP-FUCOSE IS CRUCIAL FOR THE O-FUCOSYLATION OF NOTCH EGF-LIKE REPEATS -- A REDUCTION IN NOTCH SIGNALING ACTIVITY MAY ACCOUNT FOR THE PATHOLOGY OF CDG IIC. , MECHANISMS REQUIRED FOR THE INTRACELLULAR SUPPLY OF GDP-FUCOSE FOR THE O-FUCOSYLATION OF THE NOTCH EGF-LIKE REPEATS -- CONCLUSION -- REFERENCES -- CHAPTER 4 NOTCH SIGNALING AND THE GENERATION OF CELL DIVERSITY IN DROSOPHILA NEUROBLAST LINEAGES -- INTRODUCTION -- NOTCH IS REQUIRED FOR LATERAL INHIBITION DURING THE PHASE OF NEURAL STEM CELL GENERATION -- ASYMMETRIC CELL DIVISION AS A MECHANISM TO GENERATE CELL DIVERSITY IN NEUROBLAST LINEAGES -- FUNCTION OF NOTCH IN BINARY CELL FATE SPECIFICATION IN THE DROSOPHILA NERVOUS SYSTEM -- NOTCH FUNCTION IN CELL FATE SPECIFICATION IN THE EMBRYONIC NB7-3 LINEAGE -- NOTCH FUNCTION DURING LARVAL NEUROGENESIS -- Is There Contextual Control of Notch Activity? -- DOWN-STREAM NOTCH TARGETS/EFFECTORS -- Is Notch Instructive or Permissive? -- CONCLUSION -- ACKNOWLEDGEMENT -- REFERENCES -- CHAPTER 5 NEPRO: A Novel Notch Effector for Maintenance of Neural Progenitor Cells in the Neocortex -- INTRODUCTION -- THE NOTCH PATHWAY IS ESSENTIAL FOR MAINTENANCE OF NPCs -- IDENTIFICATION OF NEPRO -- NEPRO INHIBITS NEURONAL DIFFERENTIATION AND IS NECESSARY FOR THE MAINTENANCE OF NPCs -- NEPRO IS IN PARALLEL WITH HES, DOWNSTREAM OF NOTCH -- NEPRO IS AN ESSENTIAL EFFECTOR FOR THE NOTCH PATHWAY -- DISCUSSION -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 6 NOTCH SIGNALING AND DEVELOPMENT OF THE HEMATOPOIETIC SYSTEM -- INTRODUCTION -- OVERVIEW OF NOTCH SIGNALING -- NOTCH AND EMERGENCE OF DEFINITIVE HEMATOPOIETIC STEM CELLS -- NOTCH AND MAINTENANCE OF HEMATOPOIETIC STEM CELLS -- NOTCH AND T-CELL DEVELOPMENT -- OTHER FUNCTIONS OF NOTCH IN HEMATOPOIESIS -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 7 NOTCH SIGNALING IN LUNG DEVELOPMENT AND DISEASE -- INTRODUCTION -- NOTCH PROMOTES PROXIMAL CELL FATES IN EARLY LUNG DEVELOPMENT -- NOTCH COORDINATES ALVEOLAR DEVELOPMENT. , THE ROLE OF NOTCH IN REPAIR AND DISEASE OF THE ADULT LUNG -- NOTCH AND LUNG CANCER -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 8 THE ROLE OF NOTCH SIGNALING IN KIDNEY DEVELOPMENT AND DISEASE -- INTRODUCTION -- NOTCH SIGNALING IN PRONEPHROS DEVELOPMENT -- NOTCH SIGNALING IN METANEPHROS DEVELOPMENT -- An Overview of Metanephros Development -- Notch Signaling in the Developing Mammalian Nephron -- Notch Signaling in Collecting Duct Development -- NOTCH SIGNALING IN KIDNEY DISEASES AND RENAL EPITHELIAL CANCERS -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 9 NOTCH SIGNALING AND THE DEVELOPING SKELETON -- INTRODUCTION -- Notch Pathway Regulation of Somitogenesis -- Notch Signaling Initiates Chondrogenesis while Repressing Differentiation -- Notch Inhibition of Osteoblast Differentiation -- Notch Pathway Suppression of Osteoclastogenesis -- NOTCH PATHWAY ASSOCIATED SKELETAL DISORDERS -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 10 NOTCH SIGNALING AND THE DEVELOPING SKIN EPIDERMIS -- INTRODUCTION -- NOTCH SIGNALING -- LOCALIZATION OF NOTCH RECEPTORS AND LIGANDS IN EPIDERMIS -- GROWTH ARREST AND ADHESION -- NOTCH AND TERMINAL DIFFERENTIATION -- DELETION OR ACTIVATION OF NOTCH PATHWAY COMPONENTS -- CROSS-TALKS WITH OTHER PATHWAYS -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 11 NOTCH SIGNALING AND THE DEVELOPING HAIR FOLLICLE -- INTRODUCTION -- DEVELOPMENT AND STRUCTURE OF THE HAIR FOLLICLE -- EXPRESSION OF MEMBERS OF THE NOTCH PATHWAY IN THE HAIR FOLLICLE -- Expression during Embryogenesis -- Expression during Postnatal Life -- NO ESSENTIAL ROLE FOR NOTCH IN THE INITIAL STEPS OF EMBRYONIC HAIR FOLLICLE DEVELOPMENT -- NOTCH AND THE MAINTENANCE OF CELLULAR IDENTITY WITHIN THE HAIR FOLLICLE -- Gain of Function Mutations in Notch Pathway Act Non Cell Autonomously on Hair Follicle Differentiation. , Loss of Notch Function in Hair Follicles Leads to Alopecia and/or Alteration in the Differentiation Program -- NOTCH AND THE REGULATION OF CELL FATE IN HAIR FOLLICLES -- ADDITIONAL ROLES FOR NOTCH IN HAIR FOLLICLES -- Control of Hair Follicle Cycling -- Control of Cell Proliferation and Apoptosis in Hair Bulbs -- Development of Sebaceous Glands -- Melanocyte Homeostasis -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 12 NOTCH SIGNALING AND THE DEVELOPING INNER EAR -- INTRODUCTION: STRUCTURE AND DEVELOPMENT OF MAMMALIAN INNER EAR -- MULTIPLE ROLES OF NOTCH SIGNALING PATHWAY DURING INNER EAR DEVELOPMENT -- Hair Cell and Supporting Cell Differentiation -- Determination of Prosensory Region -- Jagged1 and Prosensory Determination -- Role of Notch Signaling in Induction for Prosensory Region -- Possible Effectors of the Notch Signaling Pathway in the Context of Early Prosensory Formation -- Biphasic Regulation of Cell Proliferation by the Notch Signaling Pathway during the Inner Ear Development -- Delamination of Neural Progenitors -- NOTCH SIGNALING PATHWAY AND THE INNER EAR REGENERATION -- CONCLUSION -- REFERENCES -- CHAPTER 13 NOTCH SIGNALING IN CANCER STEM CELLS -- INTRODUCTION -- THE CANCER STEM CELL MODEL -- CLINICAL IMPLICATIONS OF CANCER STEM CELLS -- CANCER STEM CELLS AND CHEMORESISTANCE -- CANCER STEM CELLS AND RADIORESISTANCE -- NOTCH SIGNALING IN CANCER STEM CELLS -- NOTCH PROTECTS CANCER STEM CELLS FROM RADIATION -- CONCLUSION -- REFERENCES -- CHAPTER 14 NOTCH SIGNALING PATHWAY AND CANCER METASTASIS -- INTRODUCTION -- CRITICAL CELLULAR AND MOLECULAR EVENTS IN CANCER METASTASIS -- EMT and Cancer Cell Dissemination -- Invasion and Cell Migration -- Resistances to Apoptosis and Anoikis -- Angiogenesis and Lymphangiogenesis -- The "Seed and Soil Hypothesis" -- Metastatic Cancer Stem Cells (CSCs) -- THE NOTCH SIGNALING PATHWAY. , The Components of the Notch Signaling Pathway -- The Regulation of the Notch Signaling Pathway -- NOTCH SIGNALING PATHWAY AND CANCER METASTASIS -- Osteosarcoma -- Breast Cancer -- Prostate Cancer -- Melanoma -- THE MECHANISMS OF NOTCH FUNCTION ON CANCER METASTASIS -- Notch Signaling Converts the Hypoxic Stimulus into EMT -- Blocking Notch Signaling Produces Dysfunctional Tumor Vessels -- Notch Signaling Promotes Anoikis-Resistance of Tumor Cells -- CONCLUSION -- ACKNOWLEDGEMENT -- REFERENCES -- CHAPTER 15 NOTCH, APOPTOSIS AND CANCER -- INTRODUCTION -- p53 PATHWAY -- NF-kB PATHWAY AND NOTCH IN APOPTOSIS -- PI3K-Akt PATHWAY -- NOTCH AND THE MAJOR APOPTOTIC PATHWAYS -- CONCLUSION -- REFERENCES -- CHAPTER 16 LIGAND-DEPENDENT NOTCH SIGNALING IN VASCULAR FORMATION -- INTRODUCTION -- BASIC MECHANISMS OF THE NOTCH RECEPTOR LIGAND-SIGNALING PATHWAY -- NOTCH RECEPTOR AND LIGAND EXPRESSION IN BLOOD VESSELS -- NOTCH1, NOTCH4 AND THE LIGANDS DIII AND DII4 DURING ARTERIAL SPECIFICATION AND MAINTENANCE -- NOTCH3, JAGGED1 AND Dll1 DURING SMOOTH-MUSCLE DIFFERENTIATION AND MATURATION -- DII4 AND JAGGED1 IN TIP- AND STALK-CELL SPECIFICATION DURING SPROUTING ANGIOGENESIS -- NOTCH LIGANDS IN PATHOLOGICAL ANGIOGENESIS -- NOTCH SIGNALING IN PERIPHERAL ISCHEMIA -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 17 NOTCH AND THE p53 CLAN OF TRANSCRIPTION FACTORS -- INTRODUCTION -- NOTCH -- THE p53 CLAN -- CROSSTALK OF NOTCH WITH THE p53 CLAN IN DEVELOPMENT, DIFFERENTIATION AND HOMEOSTASIS -- CROSSTALK OF NOTCH WITH THE p53 CLAN IN CANCER AND OTHER DISEASES -- CONCLUSION -- REFERENCES -- CHAPTER 18 NOTCH SIGNALING AND BREAST CANCER -- INTRODUCTION -- EVIDENCE FOR ONCOGENIC NOTCH IN CARCINOMA OF THE BREAST -- MECHANISMS OF NOTCH ACTIVATION IN BREAST CANCER -- MECHANISMS OF NOTCH-INDUCED TRANSFORMATION -- Notch in Mammary Stem Cells and Tumor Initiating Cells. , Notch, Lineage Specification and Breast Cancer Subtype.
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  • 2
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Cellular signal transduction. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (200 pages)
    Edition: 1st ed.
    ISBN: 9783030344368
    Series Statement: Advances in Experimental Medicine and Biology Series ; v.1218
    DDC: 571.74
    Language: English
    Note: Intro -- Preface -- Contents -- Contributors -- About the Editors -- Chapter 1: Notch Signaling and Tissue Patterning in Embryology: An Introduction -- References -- Chapter 2: Notch Signaling and Embryonic Development: An Ancient Friend, Revisited -- Introduction -- Challenge and Promise: The Impact of Notch Signaling for the Embryogenesis of the Central Nervous System (CNS) -- Embryogenesis of the Central Nervous System (CNS): A Brief Introduction -- Embryonic Neural Stem Cells and Notch Signaling -- Unraveling Hidden Secrets: Notch Signaling in the Embryonic Development of Skin and Hair Follicles -- From the Bench to the Patient: The Impact of the Notch Pathway for Embryonic Kidney Development, Notch2, Jag1, and Beyond -- Notch Receptor 2 and Its Corresponding Ligand Jag1 Are Key Players for Embryonic Liver Development -- The Role of Notch Signaling for Embryonic Development of the Pancreas -- Notch2 and Jag1 Function in Embryonic Heart Development -- Notch2 and Jag1 Function During Skeletal Development -- The Impact of the Notch Pathway for Angiogenesis -- Roles for Notch2 and Jag1 in the Embryonic Development of Inner Ear and Eye, Tissues with Important Sensory Functions -- Conclusions -- References -- Chapter 3: The Five Faces of Notch Signalling During Drosophila melanogaster Embryonic CNS Development -- Introduction -- Notch Canonical Molecular Pathway -- Notch Non-canonical Molecular Pathway -- Neuroblast Selection and Delamination -- The Type I-> -- 0 Daughter Cell Proliferation Switch -- Dictating Asymmetric Cell Fate Between Sibling Neurons -- Glia Development -- Axon Pathfinding -- Conclusions -- References -- Chapter 4: Epigenetic Regulation of Notch Signaling During Drosophila Development -- Introduction -- Notch Signaling -- The Advantages of Drosophila as Model Organism for Notch Signaling Study. , The Chromatin Assembly Factor CAF-1 -- Epigenetic Regulation of Notch Signaling by CAF-1 -- Epigenetic Regulation of Notch Signaling by Other Epigenetic Regulators -- Conclusion -- References -- Chapter 5: Regulation of Proneural Wave Propagation Through a Combination of Notch-Mediated Lateral Inhibition and EGF-Mediated Reaction Diffusion -- The Proneural Wave -- The Link Between Proneural Transcription Factors and Notch Signaling -- The Link Between Proneural Transcription Factors and EGF Signaling -- Establishing a Mathematical Model of the Proneural Wave -- Phenomenological Versus Mechanistic Models -- The Mathematical Model Reproduces the Essential Behaviors of the Proneural Wave -- Two Distinct Functions of Notch Signaling -- Using the Model to Solve the Paradox of the Notch Mutant Phenotype -- Expanding the Roles of Notch to Other Biological Phenomena -- References -- Chapter 6: A Nucleolar Protein, Nepro, Is Essential for the Maintenance of Early Neural Stem Cells and Preimplantation Embryos -- Development of the Neocortex -- Notch Signaling Is Required for the Maintenance of NSCs -- Both Nepro and Hes Are Required for the Maintenance of Early NSCs -- Nepro Is also Required for the Maintenance of the Preimplantation Embryo -- Notch Signaling Controls Dendritic Complexity of Mitral Cells in the Olfactory Bulb -- Discussion -- Conclusion -- References -- Chapter 7: Role of Notch Signaling in Leg Development in Drosophila melanogaster -- Introduction -- Leg Segmentation and Positioning of Notch Activity -- Leg Specification and Proximo-distal Patterning -- Segmentation of the Tarsal Region -- Dl/Ser Positioning and Notch Activation -- Notch Regulation of Leg Development -- Joint Formation in Response to Notch Activity -- Dysfusion Control of Tarsal Joint Morphogenesis. , Localized Apical Constriction Drives Epithelial Folding to Form the Tarsal Joints -- Dysf-Dependent Rho1 Activity Regulates Apical Constriction -- Dysf Transcriptional Control of Apical Constriction -- Adult Joint Formation Depends on Notch Activity -- Notch Regulation of Leg Growth -- References -- Chapter 8: Notch Signalling: The Multitask Manager of Inner Ear Development and Regeneration -- Introduction -- The Notch Signalling Pathway -- Introduction to the Inner Ear -- Roles of Notch During Inner Ear Development -- Lateral Inhibition and the Regulation of Otic Neurogenesis -- Lateral Inhibition and Hair Cell Fate Decisions -- Lateral Induction and Prosensory Specification -- Notch Signalling During Otic Placode Formation -- Managing and Multitasking: Specificity and Integration of Notch Functions in the Developing Inner Ear -- Competence States Determine the Context-Specific Effects of Notch Signalling -- Integration of Notch Activity from Multiple Ligands and Modes of Signalling -- Integration of Notch Signalling with Cell Proliferation and Rearrangements -- Notch Signalling and Hair Cell Regeneration -- Conclusion -- References -- Chapter 9: Notch Pathway and Inherited Diseases: Challenge and Promise -- Introduction -- Defective Notch Signaling and Embryogenesis: Congenital Heart Disease (CHD) as an Example for the Broad Variety of Pathophysiological Consequences in Individual Tissues -- Alagille Syndrome (ALGS) -- Molecular Biology and Genetics of Alagille Syndrome (ALGS) -- Clinical Hallmarks of Alagille Syndrome -- Adams-Oliver Syndrome: Highlighting the Impact of NOTCH1, DLL4, and RBPJk for Human Embryogenesis -- Historical Considerations -- Molecular Biology and Genetics of Adams-Oliver Syndrome -- Clinical Findings in Adams-Oliver Syndrome -- Hajdu-Cheney Syndrome (HCS) (OMIN 102500) -- Historical Considerations. , Molecular Biology and Genetics of Hajdu-Cheney Syndrome (HCS) -- Clinical Findings in Hajdu-Cheney Syndrome (HCS) -- Cerebral Autosomal-Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CADASIL) (OMIM 125310) -- Early-Onset Arteriopathy with Cavitating Leukodystrophy (EACL) -- Lateral Meningocele Syndrome (LMS) (OMIM 130720) -- Infantile Myofibromatosis-2 (IM-2) (OMIM 615293) -- Conclusions -- References -- Index.
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK; Malden, USA : Munksgaard International Publishers
    Journal of cutaneous pathology 31 (2004), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background:  Increasing evidence points at an important function of vitamin D metabolites for growth regulation in various tissues, and new vitamin D analogs are interesting candidates for the treatment of malignancies, including squamous cell carcinomas (SCC).Methods:  We have analyzed expression of vitamin D receptor (VDR), vitamin D-25-hydroxylase (25-OHase), 25-hydroxyvitamin D-1α-hydroxylase (1α-OHase), and 1,25-dihydroxyvitamin D-24-hydroxylase (24-OHase) in SCC.Results:  Intensity of VDR immunoreactivity was increased in SCCs as compared to normal human skin. VDR staining did not correlate with histological type or grading, nor with markers for proliferation, differentiation, or apoptotic cells. Incubation of SCC cell lines (SCL-1, SCL-2) with calcitriol resulted in a dose-dependent suppression of cell proliferation (approximately up to 30%) in vitro, as measured by a tetrazolium salt (WST-1)-based colorimetric assay. RNA levels for VDR, 25-OHase, 1α-OHase, and 24-OHase were significantly elevated in SCCs as compared to HS, as measured by real-time polymerase chain reaction.Conclusions:  Our findings demonstrate that modulation of VDR expression and local synthesis or metabolism of vitamin D metabolites may be of importance for growth regulation of SCCs. Additionally, SCCs represent potential targets for therapy with new vitamin D analogs that exert little calcemic side effects or for pharmacological modulation of calcitriol synthesis/metabolism in these tumors.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK; Malden, USA : Munksgaard International Publishers
    Experimental dermatology 14 (2005), S. 0 
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: UV-exposition is considered as the main reason for the development of cancers of the skin. However, 90 to 100% of the Vitamin-D reqirement is formed within the skin through the action of sunlight. Considering the results of epidemiological studies, that have detected an association of Vitamin-D deficiency with various types of cancer (e.g. colon-, prostate- and breast cancer), this is a real dilema. The cancer protective effect of vitamin-D is contributed to the extra renal, local production of 1α,25(OH)2D3 by the 25-hydroxyvitamin D-1α-hydroxylase, which has been detected in various tissues. In respect of the novel functions of vitamin-D and the risk of adverse consequences in case of deficiency we have screened sun deprived risk groups (A: patients with genodermatoses connected with defects in sun-induced DNA repair: n = 4: 3 patients with xeroderma pigmentosum and 1 patient with basal cell nevus syndrome; and B: non vitamin-D substituted renal transplant recipients under immunosuppressants: n = 33) for their vitamin-D status. As measure of the vitamin-D store and as substrate for the 25-hydroxyvitamin D-1α-hydroxylase basal 25(OH)D3 serum levels (Nichols Institute Diagnostika GmbH, Bad Nauheim, Germany) have been analysed. In both groups decreased basal 25(OH)D3 serum levels were detected. Therefore we demand a monitoring of vitamin-D status in patients practising sun protection, in case of vitamin-D deficiency an oral substitution should be recommended.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Increasing evidence indicates an important role of the skin vitamin D system for tumorigenesis and progression of malignant melanoma. We have now characterized the vitamin D system in melanoma cell lines, detecting strong RNA expression of vitamin D receptor (VDR), 25-hydroxyvitamin D-1α-hydroxylase (1αOHase), vitamin D-25-hydroxylase (25OHase) and 1,25-dihydroxyvitamin D-24-hydroxylase (24OHase) in various melanoma cell lines (MEWO, SKMEL28, BU47HOM) using real time PCR (LightCycler) and specific hybridisation probes. We then have analyzed effects of 1,25-dihydroxyvitamin D3 and analogs (EB 1089, MC 1288) on proliferation and apoptosis as well as on expression of VDR, 1αOHase), 25OHase, and 24OHase in various melanoma cell lines (BUHOM, MEWO, SKMEL)in vitro. Using a tetrazolium salt (WST-1) based colorimetric assay, we detected dose-dependent inhibition of cell growth (up to 40%) induced by calcitriol or its analogs. Treatment of melanoma cells with calcitriol resulted in decreased immunoreactivity of proliferation markers including Ki-67 and PCNA. Flow cytometry experiments (bcl-2, bcl-xl, bcl-xs, bcl-x, bax, CD95) and analysis of annexin Pi expression revealed no induction of apoptosis by calcitriol (10−7 M) or its analogs, while increased levels of bcl-2 protein were detected. Additionally, we show modulation of vitamin D-induced inhibition of cell proliferation by calpain inhibitors I and II (Calbiochem) as well as by inhibitors of histonedeacetylation (sodium butyrate, trichostatin A). In conclusion our findings indicate that (i) vitamin D analogs suppress proliferation but do not induce apoptosis in melanoma cell lines, (ii) induction of VDR and 24-OHase expression as well as histonedeacetylation and calpain activity modulate vitamin D-induced growth inhibition, (iii) new calcitriol analogs exerting less systemic side effects may be interesting candidates for the treatment of metastasizing malignant melanoma.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Experimental dermatology 13 (2004), S. 0 
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract:  It has been shown that epidermal keratinocytes have the capacity for the UVB-induced photochemical conversion of 7-dehydrocholesterol to vitamin D3, and also for the enzymatically controlled hydroxylation of the photolysis product. This metabolic loop results in the formation of the biologically active final product 1α,25-dihydroxyvitamin D3 (1α,25(OH)2D3, calcitriol). The epidermal synthesis of calcitriol is of fundamental relevance because calcitriol regulates important cellular functions in keratinocytes and immunocompetent cells. Because of their anti-proliferative and prodifferentiating effects, calcitriol and other vitamin D analogs are highly efficient in the treatment of psoriasis vulgaris. In addition, the known therapeutic effect of UVB light therapy in the treatment of psoriasis may, at least in part, be mediated via UVB-induced synthesis of calcitriol. Increasing evidence now indicates that cutaneous vitamin D synthesis is of great importance for the prevention of a broad variety of diseases, including various malignancies. It has been postulated that cancer mortality could be reduced via careful UV exposure or, more safely, via oral substitution with vitamin D. These new findings must be taken into account when establishing new sun protection guidelines for the prevention of skin cancer. In addition, better understanding of the metabolism of vitamin D in the skin has opened up new perspectives for the therapeutic application of vitamin D analogs, e.g. in inflammatory skin diseases.
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  • 7
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The human Mut-S-Homologon-2 (hMSH-2) gene product is a member of a highly conserved family of proteins involved in postreplication mismatch repair. We have analysed hMSH-2 expression in normal ovarian tissue (n=15) and ovarian carcinomas (n=40). hMSH-2 protein was investigated immunohistochemically on frozen sections using a highly sensitive streptavidin–peroxidase technique and a specific mouse monoclonal antibody (clone FE11). A hMSH-2-immunoreactivity score (hMSH-2-IRS) for semiquantitative analysis of hMSH-2 expression is presented. In normal ovarian tissue, we only found weak nuclear immunoreactivity for hMSH-2 in 60%, while the remaining 40% were hMSH-2 negative (mean hMSH-2-IRS: 0.73; SD: ±0.70). All ovarian carcinomas analysed revealed moderate to strong nuclear immunoreactivity (mean hMSH-2-IRS: 8.05; SD: ±3.65). hMSH-2 staining was heterogeneous, with visual differences between individual tumour cells. Expression of hMSH-2 protein was consistently and strongly upregulated in tumour cells of ovarian carcinomas as compared to normal ovarian tissue. No statistically significant correlation in comparing the labelling patterns for hMSH-2 with the labelling patterns for Ki-67 (mean percentage of Ki-67 positive tumour cells: 25.88%; SD: ±18.43) was observed in ovarian carcinomas. Furthermore, no statistical significant correlations between hMSH-2-IRS and histological grading (p=0.47), histological type of carcinoma (p=0.706) or FIGO-classification (p=0.054) were found. Our findings indicate that (a) hMSH-2 is expressed in normal human ovarian tissue, (b) expression of hMSH-2 is increased in ovarian carcinomas, (c) expression of hMSH-2 may be of importance for the genetic stability of ovarian carcinomas in vivo, (d) hMSH-2 mutations may not cause microsatellite instability in ovarian carcinomas, (e) hMSH-2 may contribute to mechanisms responsible for resistance to anticancer drugs.
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  • 8
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A technique for the immunohistochemical detection of retinoic acid receptor α in cryostat sections of normal human skinin situ has been developed. A highly specific mouse monoclonal antibody, directed against the F region of retinoic acid receptor α, was used and a panel of 10 fixation protocols investigated. A three-step protocol, consisting of sequential fixation in 3.7% paraformaldehyde, methanol and acetone, revealed strong nuclear immunoreactivity in epidermal keratinocytes and other cell types present in normal human skin. Other fixation protocols, including fixation regimes using formaldehyde or Carnoy's solution, were less suitable or unsuitable for detection of the receptor in cryostat sections of human skin.
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  • 9
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The localization and expression of transglutaminase K has been investigated immunohistochemically in normal cervix tissue (n=15) and in cervix carcinomas (n=23). The distribution of the transglutaminase K was compared with the staining patterns of cytokeratin 10, Ki-67, p53, and oestrogen and progesterone receptors in these tumours. Weak to strong membrane-bound immunoreactivity for transglutaminase K was detected in almost all cervix carcinomas analyzed. The immunostaining was heterogeneous, with visual differences between individual tumour cells. 66.7% of normal cervix tissues revealed no immunoreactivity for the transglutaminase K. In normal cervix tissue, the immunoreactivity was confined to upper cervix layers, predominantly to the superficial and intermediate cell layers. The intensity of both the immunostaining and the number of transglutaminase K-positive cells were upregulated in cervix carcinomas as compared to normal cervix tissue. When the coexpressions of transglutaminase K with markers of proliferation and differentiation were analyzed, no statistically significant correlation was found. Our findings indicate that (1) transglutaminase K is upregulated at the protein level in cervix carcinomas as compared to normal cervix tissue; (2) upregulation of the transglutaminase K in cervix carcinoma is not exclusively induced by alterations of epithelial differentiation or proliferation, but by different, unknown mechanisms; and (3) upregulation of transglutaminase K in cervix carcinomas may play an important role for the regulation of tumour invasive properties by modulating cell–cell interactions.
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  • 10
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We have analysed the expression and distribution of the DNA mismatch repair enzyme hMSH-2 in normal skin and basal cell carcinomas. hMSH-2 protein was investigated immunohistochemically (normal human skin: n=10; basal cell carcinomas: n=16) on frozen sections using a highly sensitive streptavidin–peroxidase technique and a specific mouse monoclonal antibody (clone FE11). In normal human skin, we found nuclear immunoreactivity for hMSH-2 in epidermal keratinocytes of the basal and first 1–3 suprabasal cell layers. All basal cell carcinomas analysed revealed strong nuclear imunoreactivity that was pronounced in peripheral tumour cells and cells of the palisade. Expression of hMSH-2 protein was consistently and strongly upregulated in tumour cells of the carcinomas as compared to adjacent unaffected epidermis or epidermis of normal human skin. Twelve of the sixteen carcinomas analysed revealed no visual correlation in comparing the labelling patterns for hMSH-2 with the labelling pattern for the proliferation marker Ki-67. Our findings indicate that (a) hMSH-2 is expressed in human epidermal keratinocytes, predominantly in lower cell layers of the viable epidermis; (b) expression of hMSH-2 protein is strongly upregulated in basal cell carcinomas as compared to unaffected epidermis; (c) the level of hMSH-2 proteins in the carcinomas is not exclusively regulated by the proliferative activity of these tumour cells; (d) inactivating mutations of the hMSH-2 gene may in the carcinomas not be involved in the carcinogenesis or microsatellite instability secondary to replication errors; (e) expression of hMSH-2 may be of importance for the genetic stability of basal cell carcinomas in vivo.
    Type of Medium: Electronic Resource
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