Antigen delivery platforms

a technology of antigens and platforms, applied in the direction of viruses, drug compositions, immunological disorders, etc., can solve the problems of devastating defects in neurological development in neonates, substantial morbidity and mortality, and substantial morbidity and mortality, and achieve the effect of inhibiting the entry of cmv

Inactive Publication Date: 2014-01-30
GLAXOSMITHKLINE BIOLOGICALS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020]In certain embodiments, the composition comprises a VRP that contains a alphavirus replicon that encodes two or more CMV proteins. In some embodiments, the VRP comprises a replicon that encodes CMV gH and gL. If desired, the composition can further comprising a second VRP containing a replicon that encodes CMV gB. The composition can also comprise an adjuvant.
[0021]The invention also relates to methods of forming a CMV protein complex. In some embodiments a self-replicating RNA encoding two or more CMV proteins is delivered to a cell, the cell is maintained under conditions suitable for expression of the CMV proteins, wherein a CMV protein complex is formed. In other embodiments, a VRP that contains a self-replicating RNA encoding two or more CMV proteins is delivered to a cell, the cell is maintained under conditions suitable for expression of the CMV proteins, wherein a CMV protein complex is formed. The method can be used to form a CMV protein complex in a cell in vivo.
[0022]The invention also relates to a method for inducing an immune response in an individual. In some embodiments, a self-replicating RNA encoding two or more CMV proteins is administered to the individual. The self-replicating RNA molecule can be administer

Problems solved by technology

Herpes viruses are widespread and cause a wide range of diseases in humans that in the worst cases can lead to substantial morbidity and mortality, primarily in immunocompromised individuals (e.g., transplant recipients and HIV-infected individuals).

Method used

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  • Antigen delivery platforms
  • Antigen delivery platforms
  • Antigen delivery platforms

Examples

Experimental program
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example 1

Delivery of Individual CMV Antigens Using a VRP Platform

[0211]Each of CMV glycoproteins gB and gH induce neutralizing responses, and gB is the dominant antigen among antibodies in human sera that neutralize infection of fibroblasts (Britt et al. (1990) J. Virol. 64(3):1079-85). The following experiments demonstrate in mice a neutralizing response against these antigens delivered using a VRP platform.

[0212]Each CMV antigen was cloned into a pcDNA-6H is vector (Invitrogen) and tested for protein expression before cloning into an alphavirus replicon vector, pVCR 2.1 SalI / XbaI derived from the plasmid described by Perri et al. (J. Virol 77(19)10394-10403 (2003)) producing the constructs shown in FIG. 2. pVCR 2.1 SalI / XbaI is a self-replicating RNA vector that, when electroporated with defective helper capsid and glycoprotein RNA, forms an infectious alphavirus particle.

[0213]pVCR vectors were used to make RNA which was electroporated into baby hamster kidney (BHKV) cells in the presence...

example 2

Construction of Polycistronic Alphavirus Vectors

[0219]CMV produces several multi-protein complexes during infection. To determine whether a single replicon expressing all components of a desired complex can be used to produce the CMV complex in a subject, or whether components of the complex could be co-delivered from multiple replicon vectors, we designed a platform that allows controlled expression of multiple CMV proteins.

[0220]An alphavirus vector (pVCR 2.1 SalI / XbaI) was modified to allow assembly of multiple subgenomic promoters (SGP) and genes of interest (GOI). pVCR 2.1SalI / XbaI ApaI site at 11026-31 bp was changed from GGGCCC (SEQ ID NO:______) to GGCGCC (SEQ ID NO:______). ClaI and PmlI restriction sites added in the region immediately downstream of the first subgenomic promoter and SalI-XbaI insert sites. The sequence at 7727-7754 bp was changed from ctcgatgtacttccgaggaactgatgtg (SEQ ID NO:______) to ATCGATGTACTTCCGAGGAACTCACGTG (SEQ ID NO:______).

[0221]A shuttling vector...

example 3

Production of CMV Complexes

[0232]This example demonstrates that CMV protein complexes can be formed in a cell after delivery of the complex components from a polycistronic alphavirus replicon vector.

[0233]gH / gL and gH / gL / gO Complexes

[0234]Polycistronic gH / gL and gH / gL / gO alphavirus replicons were constructed as described above (shown schematically in FIG. 5A). VRPs containing gH, gL, gO, gH / gL and gH / gL / gO encoding replicons were produced in BHKV cells as described above and used to infect BHKV cells to demonstrate complex formation in vitro. VRP infected ARPE-19 cells produced disulfide linked complexes of gH / gL. gO did not detectably alter gH / gL association (FIG. 5B).

[0235]Immunofluorescence studies were conducted to evaluate the localization of gH and gL delivered alone and when delivered using a polycistronic alphavirus to look at relocalization of the proteins when co-expressed. gH localization did not appear to change in the presence or absence of gL, or gL / gO. gL localization...

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Abstract

This disclosure provides platforms for delivery of herpes virus proteins to cells, particularly proteins that form complexes in vivo. In some embodiments these proteins and the complexes they form elicit potent neutralizing antibodies. Thus, presentation of herpes virus proteins using the disclosed platforms permits the generation of broad and potent immune responses useful for vaccine development.

Description

RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Patent Application No. 61 / 391,960, filed on Oct. 11, 2010, the entire teachings of which are incorporated herein by reference.BACKGROUND[0002]Herpes viruses are widespread and cause a wide range of diseases in humans that in the worst cases can lead to substantial morbidity and mortality, primarily in immunocompromised individuals (e.g., transplant recipients and HIV-infected individuals). Humans are susceptible to infection by at least eight herpes viruses. Herpes simplex virus-1 (HSV-1, HHV-1), Herpes simplex virus-2 (HSV-2, HHV-2) and Varicella zoster virus (VZV, HHV-3) are alpha-subfamily viruses, cytomegalovirus (CMV, HHV-5) and Roseoloviruses (HHV-6 and HHV-7) are beta-subfamily viruses, Epstein-Barr virus (EBV, HHV-4) and Kaposi's sarcoma-associated herpesvirus (KSHV, HHV-8) are gamma-subfamily viruses that infect humans.[0003]CMV infection leads to substantial morbidity and mortality in immunoco...

Claims

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Application Information

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IPC IPC(8): C07K14/005C12N15/86
CPCC12N15/86C07K14/005A61K39/12A61K2039/53C07K2319/92C12N2710/16122C12N2710/16134C12N2710/16722C12N2710/16734C12N2770/36143C12N2830/20C12N2840/203A61K2039/5256A61K2039/55555A61P31/22A61P37/04
Inventor FRANTI, MICHAELLILJA, ANDERSLOOMIS, REBECCAMASON, PETER
Owner GLAXOSMITHKLINE BIOLOGICALS SA
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