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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cutaneous pathology 21 (1994), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Cutaneous meningeal tumors are rare and can pose a diagnostic problem. We present a case of a 12-year-old girl with a family history of von Recklinghausen's disease. The patient was asymptomatic until the age of 11, when she developed two lesions on the head, both diagnosed as plexiform neurofibroma. Subsequently, she presented with a subcutaneous nodule on the left posterior occipital scalp which was excised. On histology, the tumor was composed of spindle-shaped cells with diffuse and nested patterns. A whorled configuration of the cells, with occasional giant cells and psammoma bodies, was present. There was no evidence of connection between the tumor and the underlying tissues. Immunohistochemical studies were positive for epithelial membrane antigen, vimentin, and weakly for neuron-specific enolase. Cytokeratin, S-100 protein, and muscle markers were negative. Based on these features, the diagnosis of cutaneous meningioma was made. An MRI examination failed to detect any communication between the tumor site and the meninges; however, asymptomatic bilateral acoustic neuromas were identified. This case, besides being of interest as a primary cutaneous meningioma, also documents a unique combination of findings, i.e., plexiform neurofibroma, meningioma, and cerebellopontine acoustic neuromas, which should alert the clinician to a forme fruste presentation of von Recklinghausen's disease.Argenyi ZB, Thieberg MD, Hayes CM, Whitaker DC. Primary cutaneous meningioma associated with von Recklinghausen's disease.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Progressive atrophic rhinitis is an upper respiratory tract disease of pigs caused by toxigenic strains of the bacterium Pasteurella multocida. In this study the effect of P. multocida on the humoral immune response of pigs and mice was investigated. Pigs were given live intranasal challenge with either a toxigenic strain or a non-toxigenic strain of P. multocida, or were given daily intranasal instillation of a cell-free lysate of the toxigenic strain. Mice were given a live intranasal challenge of either a toxigenic or a non-toxigenic strain of P. multocida. All of the animals were immunised with ovalbumin and serum concentrations of anti-ovalbumin antibodies were quantified and compared between different treatment groups and control animals. Intranasal challenge with toxigenic P. multocida caused a significant reduction in the levels of anti-ovalbumin IgG in both species. A similar effect was seen in pigs given a cell-free extract of toxigenic P. multocida. Whilst the mechanism of this suppression is unclear, we surmise that immunomodulation of the host is an important virulence factor for toxigenic P. multocida, and could be an important function of the toxin. This immunomodulatory effect may enhance colonisation of P. multocida aiding horizontal transmission and may predispose to concurrent infection with other potential pathogens.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Plant molecular biology 27 (1995), S. 513-528 
    ISSN: 1573-5028
    Keywords: cDNA ; differential hybridization ; Medicago sativa ; stems ; vascular tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have identified three stem abundantly expressed genes in lucerne (alfalfa, Medicago sativa). A cDNA library, constructed from lucerne stem polyadenylated RNA, was screened by differential hybridization. From this screening, cDNA clones that correspond to genes which are preferentially, or specifically, expressed in the stem were isolated. MsaS1 encodes an unidentified protein, MsaS2 encodes an S-adenosyl-homocysteine hydrolase and MsaS3 encodes an extensin-like protein. Northern blot analysis of RNA isolated from individual stem internodes indicated that the three corresponding genes show differing developmental patterns of expression. The expression of MsaS1 was confined to the youngest stem tissue and may be regulated by sucrose. In stem tissue the level of RNA for the three genes decreased in response to wounding. Tissue print hybridization analysis was used to localize the expression of the genes to the xylem side of vascular bundles in lucerne stems.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-5028
    Keywords: alfalfa ; cinnamyl alcohol dehydrogenase ; ELI3 ; lignification ; lucerne ; stem abundant cDNA ; substrate specificity ; wound induction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A lucerne (alfalfa, Medicago sativa) stem cDNA library was screened with a cinnamyl-alcohol dehydrogenase (CAD) cDNA probe from tobacco (Nicotiana tabacum cv. Samsun). Two distinctly different cDNA clones (54% identical) were isolated and identified as putative CAD-encoding cDNAs by comparison of their nucleotide sequences with those of CAD-encoding DNA sequences from other plant species. One of the cDNAs, MsaCad2, was found to be 99.4% identical at the nucleotide level to the previously isolated lucerne cad cDNA which encodes a CAD isoform involved in lignin biosynthesis. The other cDNA, MsaCad1, has not been reported previously in lucerne, and encodes a protein related to the ELI3 class of elicitor-inducible defence-related plant proteins. The MsaCad1- and MsaCad2-encoded proteins were expressed in Escherichia coli and CAD1 was shown to be active with a range of cinnamyl, benzyl and aliphatic aldehyde substrates, while CAD2 was specific for the cinnamyl aldehydes only. Each of the respective genes is present as one or two copies. The MsaCad1 gene is expressed most actively in stem and floral tissue, whereas MsaCad2 is most actively expressed in stem, hypocotyl and root tissue. In stem tissue, expression of both genes occurs predominantly in internodes 4 and 5 (from the apex). MsaCad2, in contrast to MsaCad1, is not significantly expressed in the top three internodes of the stem. Both MsaCad1 and MsaCad2 are wound-inducible, and the wound-responsiveness of each gene is modulated by salicylic acid.
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 2013-09-03
    Description: Nature Cell Biology 15, 1067 (2013). doi:10.1038/ncb2804 Authors: Tsun-Kai Chang, Bhupendra V. Shravage, Sebastian D. Hayes, Christine M. Powers, Rachel T. Simin, J. Wade Harper & Eric H. Baehrecke
    Print ISSN: 1465-7392
    Electronic ISSN: 1476-4679
    Topics: Biology , Medicine
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