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the vaccine contains purified viral proteins, called L1.
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http://www.freepatentsonline.com/EP1243655.html15. A pharmaceutical composition comprising a DNA sequence of any one of claims 1 to 8, an expression vector of any one of claims 9 to 11, the E6 or E7 fusion protein of claim 13 or the E6 or E7 fusion protein produced according to the method of claim 14 in a pharmaceutically acceptable carrier.
18. Use of an E6 or E7 fusion protein according to claim 13 or produced according to the method of claim 14 in an in vitro assay for the detection of specific antibodies or cytotoxic T lymphocytes in a sample obtained from a subject infected by HPV.
19. Use of a transgenic mouse line transformed with a DNA sequence according to any one of claims 1 to 8 or an expression vector of any one of claims 9 to 11 for testing vaccines against HPV in vitro.
However, unfortunately, the above strategies exhibit a variety of disadvantages which so far have hampered the development of a safe and efficient vaccine. As regards the use of synthetic antigenic peptides it has to be stressed that the identification of HPV specific, immunoreactive peptides is very complex. It requires large numbers and quantities of peptides for vaccines to be effective and of a broad spectrum. Moreover, synthetic peptides do not contain posttranslational modifications (e.g., glycosylation, sulfation, phosphorylation) normally found in native proteins and therefore are not efficient enough as vaccines. The BCG based vaccine delivery systems expressing the L1 late protein of HPV 6b or the E7 early protein of HPV 16 have been used as immunogens. However, the immune responses obtained with these systems was even less than those elicited by protein/adjuvant vaccines and, thus, this system is considered unlikely to be useful as a single component vaccine strategy. As regards DNA vaccines it has been observed that the expression of wild-type HPV genes is quite low, even if they are expressed from strong promoters, such as that of the cytomegalovirus (CMV). As regards the use of Virus-like particles (VLPs) it has to be mentioned that true VLPs are made of the L1 (capsid) protein of a specific HPV type. Therefore, they may be only useful as prophylactic rather than as therapeutic vaccines, if ever. Pseudotyped VLPs containing, for instance, epitopes of HPV-16 E7 have also been described and may be useful as prophylactic and therapeutic vaccines. However, an important limitation is that VLPs are produced in insect cells or in yeast.
So far, no suitable production systems in mammalian cells have been established. Therefore critical epitopes depending on posttranslational modifications which take place in human cells are lost in these systems.Therefore, it is the object of the present invention to provide a safe and effective vaccine, preferably a genetic vaccine, for the treatment or prevention of an HPV infection or a neoplasm associated to HPV.
According to the invention this is achieved by the subject matters defined in the.claims. The present invention provides DNA sequences for inducing immune response to the E6 and/or E7 proteins of oncogenic HPV in a host animal, preferably by administering vectors containing said DNA sequences, e.g. plasmid vectors, herpes simplex virus type 1 amplicon or recombinant Semliki forest virus vectors. Said DNA sequences encode the HPV proteins as fusion proteins that are immunogenic but are not capable of inducing cell transformation. The DNA sequences of the invention are characterized bay the following features:
1. (a) The DNA sequences of the HPV E6/E7 genes have been modified to make their codon usage closer to that of human genes, i.e., at least 20% of the original codons are exchanged by codons which lead to an enhanced translation in a mammalian cell, (

the genes have been modified by mutation to make them non-functional, thereby' disabling their oncogenic capability (deletions are, preferably, point mutations, because these lead to loss of potentially essential epitopes), © the HPV genes have been fused to highly immunogenic proteins to enhance their immunogenicity in the host (these fusions are not expected to result in masking of HPV protein epitopes, since the fragments fused are of sufficient length as to avoid this problem), and, preferably, expression of the HPV genes is provided by recombinant, replication-deficient HSV, SFV or high copy plasmid vectors or combinations of these.
The expression "orignial codons" refers to the codons found in the corresponding wildtype version of the HPV.
The expression "enhanced translation in a mammalian cell" refers to the genes resulting from introduction of silent mutations in the HPV sequences, as described in the present invention, which create open reading frames consisting entirely of preferred human codons, and thus lead to enhanced expression of the proteins they encode in mammalian cells.
The transforming potential of the enhanced genes of the present invention and of their derivatives (fusion proteins like that of Figure 5 and others:in which the HPV gene has a deletion of at least 50 %) was tested by standard methods using mouse NIH 3T3 cells and primary human keratinocytes. Their wild type counterparts and empty plasmid vector were used as positive and negative controls, respectively.
The HPV enhanced genes and their fusion DNA constructs were subcloned into the multiple cloning site of the plasmid pIRESNeo2 (Clontech, Heidelberg, Deutschland). The resulting plasmids were amplified in E.coli and purified on resin (Quiagen, Hilden, Deutschland), eluted, ethanol precipitated and resuspended in sterile, deionized water. DNA quanitity and purity was determined by spectrophotometric measurements of absorbance at 260 and 280 nm and by agarose gel electrophoresis. NIH 3T3 cells (ATCC, Manassas) were maintained on Dulbecco's modified Eagle's medium supplemented with L-glutamine and 10 % fetal calf serum
Transfection of NIH 3T3 cells with plasmid DNA was carried out using FuGene ™ 6 Transfection Reagent (Roche, Mannheim, Deutschland)
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http://www.jneurosci.org/cgi/content/full/20/15/5696Clinical Mutations in the L1 Neural Cell Adhesion Molecule Affect Cell-Surface ExpressionMutations in the L1 neural cell adhesion molecule, a transmembrane glycoprotein, cause a spectrum of congenital neurological syndromes, ranging from hydrocephalus to mental r******ation. Many of these mutations are single amino acid changes that are distributed throughout the various domains of the protein. Defective herpes simplex virus vectors were used to express L1 protein with the clinical missense mutations R184Q and D598N in the Ig2 and Ig6 extracellular domains, respectively, and S1194L in the cytoplasmic domain. All three mutant proteins were expressed at similar levels in infected cells. Neurite outgrowth of cerebellar granule cells was stimulated on astrocytes expressing wild-type or S1194L L1, whereas those expressing R184Q and D598N L1 failed to increase neurite length. Live cell immunofluorescent staining of L1 demonstrated that most defective vector-infected cells did not express R184Q or D598N L1 on their cell surface. This greatly diminished cell-surface expression occurred in astrocytes, neurons, and non-neural cells. In contrast to wild-type or S1194L L1, the R184Q and D598N L1 proteins had altered apparent molecular weights and remained completely endoglycosidase H (endoH)-sensitive, suggesting incomplete post-translational processing. We propose that some missense mutations in human L1 impede correct protein trafficking, with functional consequences independent of protein activity. This provides a rationale for how expressed, full-length proteins with single amino acid changes could cause clinical phenotypes similar in severity to knock-out mutants.
Don't quite understand this but it doesn't look good...
http://www.ihop-net.org/UniPub/iHOP/gs/89767.htmlThe L1 neural cell adhesion molecule has multiple roles in brain development. ..... a cornified envelope protein, and the E1/ E4 and E1/ E4/ L1 viral ..