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  • 1
    ISSN: 1574-6968
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract Two monoclonal antibodies (MAbs) were produced in Balb/c mice by immunization with recombinant gp41 derived from expression of λ-BH10 cDNA of the human immunowdeficiency virus-1 (HIV-1) in the prokaryotic expression vector pEX-41 [1, 2]. Characterization of the epitopes recognized by these MAbs was done with HIV-1 envelope (env) fusion proteins expressed in Escherochia coli encoding ten distinct segments of the env proteins [3]. In comparison, another mouse MAb, M25 [4], a human MAb directed against gp41, which was produced by the xeno hydridoma line 3D6 [5, 6] and a pool of human patient sera containing antibodies to HIV-1 were tested. We were able to demonstrate that the epitopes recognized by our MAbs are located betweeni arg732 and ser759 [7] of the HIV-1 env glycoprotein gp160 of HTLV-III strain B. M25 reacted with epitopes between ser647 and pro731, which includes the hydrophobic transmembrane region of gp41 [4]. The human MAb against gp41, 3D6 [5, 6] reacts with epitopes between ile474 and trp646, a polypeptide stretch consisting of gp120 and gp41 specific amino acids. The human serum pool, positive for HIV-1 antibodies, reacted predominantly with antigenic determinants locatedp between ile474 and leu863. The recombinant env fusion proteins were initially produced to test the immunoreactivity with patient sera and to characterize epitopes which are relevant for immunodiagnostic purposes [3]. In this study, we showed that the set of recombinant evr proteins is also a simple and accurate tool for the characterization of MAbs directed to the HIV envelope proteins.
    Materialart: Digitale Medien
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  • 2
    ISSN: 1439-0973
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
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  • 3
    ISSN: 1435-702X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract • Background: Subacute viral infection is known to change the phenotype of infected cells, thereby causing immune-mediated tissue damage. The aim of this study was to investigate the expression of different cell surface molecules on human retinal pigment epithelial cells (RPEC) following viral infection, with special emphasis on those having immuneregulatory functions. • Methods: Cultured RPEC were infected with cytomegalovirus (CMV), coxsackievirus B3 (CVB) or herpes simplex virus type I (HSV). Double-staining fluorescence technique was used for visualization of virus infection and cell surface markers in the same cells by laser microscopy. • Results: CMV down-regulated MHC class I antigens on RPEC, whereas CVB and HSV did not alter MHC class I antigen expression. No induction of class 11 antigens was observed in RPEC infected with CVB, HSV or CMV. The intercellular adhesion molecule ICAM-1 (CD54) was strongly expressed in uninfected RPEC, and a slight increase was observed after virus infection. Vascular cell adhesion molecule 1 (VCAM-1) was expressed in low amounts in both uninfected and infected RPEC. No expression of intercellular adhesion molecule 2 (ICAM-2), E-selectin ELAM-1 or lymphocyte-function-associated antigen 1 (LFA-1) was observed on RPEC before or after virus infection. • Conclusion: Down-modulation of immune-regulating cell surface antigens has been suggested to provide a means of long-term survival of viruses in the infected cell, favoring establishment of persistent infection. Our observation in cultured human RPEC indicates that this mechanism might indeed contribute to the development of disease affecting retinal tissue.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Graefe's archive for clinical and experimental ophthalmology 234 (1996), S. 177-185 
    ISSN: 1435-702X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract • Background Different viruses have been reported to be involved in retinal diseases in animalsystems. In humans, herpes simplex virus and cytomegalovirus have been found to cause retinal disease. Most of the studied viruses are neurotropic. In this study, the in vitro susceptibility of human retinal pigment epithelial cells (RPEC) to representative members of different groups of human pathogenic viruses was investigated. • Methods Early cultures of RPE C — after two or three passages — were infected with the following viruses: herpes simplex virus (HSV) type 1, human herpesvirus 6 (HHV-6), Epstein-Barr virus (EBV), cytomegalovirus (CMV), adenovirus types 1 and 7, measles virus, parainfluenza virus and coxsackie virus B3. • Results Cultures of RPE C could be infected with neurotropic viruses like HSV or measles virus as well as with typical respiratory viruses like parainfluenza or adenoviruses. Coxsackievirus, an enterovirus, replicated as well as human CMV whereas EBV and HHV-6, two lymphotropic viruses, failed to infect RPE. • Conclusion These findings suggest that a variety of viruses, including those causing rather common illnesses, might be capable of inducing retinal lesions under certain circumstances due to haematogenous spread during the course of viraemia.
    Materialart: Digitale Medien
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