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  • 11
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 13 (1984), S. 0 
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Histopathologic observations of 9,10-dimethyl-1,2-benzanthracene (DMBA)-induced tumors in the mouse submandibular glands arc reported using cryoprobe treatment. The experimental animals were divided into 2 groups; one received a carcinogen injection into the normal submandibular gland, and the oilier was injected with DMBA on the Mill day following cryosurgery of the gland using a 60°C cryoprobe. Pathologic findings were classified as premalignant lesions or squamous-cell carcinomas with varying degrees of keratinization, fibrosarcoma and mixed carcinoma. There was also one case each of malignant pleomorphic adenoma and cystic adenoma. Tumor incidence was nearly the same in the 2 groups. Most of the carcinomas and sarcomas in the submandibular gland were induced during the 12th and 17th weeks. DMBA application during the proliferating stage which followed the cryosurgery did not enhance epithelial-tumor induction. During submandibular gland carcinogenesis, alterations in the granular convoluted tubule cells suggests they were the initial target cells undergoing malignant transformation. Squamous-cell carcinomas with varying degrees of keratinization were induced following squamous metaplasia in duct-like structures or multicystic lesions.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 15 (1986), S. 0 
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: An immunohistochemical survey of the distribution of keratin was studied in chemically induced carcinomas of the submandibular glands of mice. Initial signs of premalignant changes were degranulation of granular convoluted tubule cells and deposition of keratin protein in small limited areas of the degranulated cells. There was a gradual increase in the area showing keratin staining in altered tubule cells. Duct-like and cystic structures stained intensely for keratin, as did squamous metaplastic epithelial cells. Induced carcinomas were variably keratinized. Basal layers of cells of squamous-cell carcinomas displayed weak keratin staining, and spinous tumor cells and parakeratotic tumor cells showed somewhat increased levels of keratin staining. Some desquamated keratotic tumor cells stained intensely for keratin. Just as the localization of epidermal and nerve growth factors and lectin-binding histochemistry have been used in studying tumorigenesis in the mouse submandibular gland, immunohistochemically detected keratin proved to be a useful marker of tumor cells of ductal segment origin.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 14 (1985), S. 0 
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Lectin binding patterns of Con A. PNA, SHA, DBA, WGA, RCA-1 and UEA-1 were tarried out in duct-ligated submandibular glands (SMGs) of rats that diplayed acute degenerating changes Lectin staining was also related to histologic changes. Proliferating epithelial cells which were probably derived from intercalated duet cells showed a strong SBA and WGA staining on the 3rd day. Duct-like and cystic structures appeared on the 7th day and staining by PNA, SBA. WGA. RCA-1 and Con A was described In mice. lectin binding after duct ligation appeared similar to the rat In the long-term observation of mice SMGs. acinar cell regeneration occurred between the 2lsl and 42nd days and they stained strongly for DBA.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 14 (1985), S. 0 
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Immunohistochemical defection of epidermal growth factor (EGF) and nerve growth factor (NGF) was carried out in duct-ligated submandibular glands (SMG) of mice with or without testosterone treatement. High levels of EGF and NGF were limited to granular convoluted tubule (GCT) cells in normal adult male mice, and reduced levels were evident in the female. After duet ligation, EGF and NGF stainings began to decrease on the 2nd or 3rd day, and by the 10th day, no staining was detectable. Decreasing levels of EGF and NGF following duct ligation, were more pronounced in the male SMG than in the female. Testosterone administration before ligation resulted in decreased EGF and NGF levels of staining; however, staining of sections on the 1st and 3rd day was a little stronger than comparable stained sections of untreated mice. In contrast, testosterone administration after duet ligation showed GCT cells of normal size with some degranulation at 10 days and irregular staining of growth factors with varying degrees of degranulation at 14 days. Histochemical staining for EGF and NGF in this group was marked, as in the normal, until the 10th day with decreasing reactions by the 14th day.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 13 (1984), S. 0 
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Complex carbohydrates in premalignant lesions of mouse submandibular gland tumors were examined by the lectin-peroxidase conjugate method. Peroxidase-conjugated lectins of PNA, RCA-1, DBA, SBA, UEA-1 and WGA were used to detect specific sugar residues of complex carbohydrates in premalignant lesions during experimental carcinogenesis. Marked reduction of PNA and SBA bindings occurred in duct-like structures and cystic lesions which were transformed from granular convoluted tubule cells. Premalignant lesions bound slightly to PNA, RCA-1, DBA, SBA and WGA and manifested increased UEA-1 binding. Squamous metaplastic epithelia of premalignant lesions manifested increased binding to PNA, RCA-1 and SBA as compared to those of duct-like structure and cystic epithelia.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 13 (1984), S. 0 
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The lectin, Concanavalin A(Con A) has been used to localize specific sugar residues (D-glucose, D-mannose and D-fructose) in premalignant lesions and squamous-cell carcinomas induced following cryosurgery of the mouse submandibular gland. The original Con A-horseradish peroxidase (HRP) technique as well as its combination with periodate oxidation and subsequent reduction by borohydrate were used to compare the epithelial elements during submandibular gland carcinogenesis. Granules in the granular convoluted tubule cells which were weakly reactive to the Con A-HRP method were not present in the premalignant duct like structures. The epithelium of premalignant lesions, duct-like structures, multicystic lesions, and squamous-cell carcinomas were positive for the cell-surface and intercellular substances; and basement membranes and stromal fibers were also positive. The results indicated that throughout malignant transformation of the ductal segments, premalignant epithelia lost Con A-HRP-staining granules and that Con A-binding patterns in induced squamous-cell carcinomas were similar to those found in squamous-cell epithelium.
    Type of Medium: Electronic Resource
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  • 17
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary Background A novel cell–cell adhesion system that consists of nectin and afadin has been identified at cadherin-based cell–cell adherens junctions. Nectin is a Ca2+-independent homophilic and heterophilic cell adhesion molecule that belongs to the immunoglobulin superfamily. Nectin has recently been shown to serve as an α-herpesvirus entry and cell–cell spread mediator. In spite of the ubiquitous expression of nectin-1α, its detailed localization in human skin has not been examined so far. Objectives To investigate the localization of nectin-1α in normal human skin and the alteration of its expression in malignant skin tumours. Methods Immunohistochemistry was employed to determine the expression of nectin-1α and other adhesion molecules. Results We detected nectin-1α in normal human epidermis, follicles and eccrine ducts. Nectin-1α was colocalized with E-cadherin at cell–cell adherens junctions of the epidermis. The concentration of the nectin–afadin system at cell–cell adherens junctions was reduced in the early stage of malignant transformation of keratinocytes, such as in basal cell carcinomas and squamous cell carcinomas, where the cadherin–catenin system was preserved. Nectin-1α at cell–cell adherens junctions was reduced in human epithelial cancer cells located at the advancing border of the tumour. Conclusions Our results showed that nectin-1α is located at cell–cell adherens junctions in human skin and that reduction of nectin-1α at cell–cell adherens junctions may be involved in the invasion of squamous cell tumours.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 175 (1991), S. 199-206 
    ISSN: 0006-291X
    Keywords: [abr] BSA; bovine serum albumin ; [abr] G protein; GTP-binding protein ; [abr] GDI; GDP dissociation inhibitor ; [abr] GDS; GDP dissociation stimulator ; [abr] SDS-PAGE; sodium dodecylsulfate-polyacrylamide gel ; [abr] TBS; Tris-buffered saline
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 77 (1977), S. 542-550 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 97 (1980), S. 309-317 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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