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Pseudotyped GFP HPV

Immunogenicity assessments in vaccine trials have focused on measurements of antibody responses to the vaccine. A series of functional assays have been generated to measure antibody-mediated neutralization for papillomaviruses. Some of the functional assays include challenges of animals that are so complex that they cannot be applied for routine testing. The current "gold standard" for measuring neutralizing anti-HPV antibodies is the pseudovirion-based neutralization assay (PBNA). Instead of using authentic viruses, pseudovirions with an encapsidated reporter can be used to avoid high risks and provide more direct measurements for antibodies.

The CD Pseudotyped GFP HPV production is based on the transfection of a 293 cell line, 293FT, engineered to express high levels of SV40 large T antigen. The cells are co-transfected with codon-modified papillomavirus capsid genes, L1 and L2, together with a pseudogenome plasmid containing the SV40 origin of replication. Pseudovirus (PsV) encapsidating a GFP reporter plasmid can be used to develop a high-throughput in vitro neutralization assay in a 96-well plate format.

Adapted from: Schiller J T, Müller M. Next generation prophylactic human papillomavirus vaccines[J]. The Lancet Oncology, 2015, 16(5): e217-e225.Adapted from: Schiller J T, Müller M. Next generation prophylactic human papillomavirus vaccines[J]. The Lancet Oncology, 2015, 16(5): e217-e225.

Products List

Cat. No. Product Name Reporter Cell Line
PSVG-HPV6 Pseudotyped GFP HPV6 GFP HEK293 FT
PSVG-HPV11 Pseudotyped GFP HPV11 GFP HEK293 FT
PSVG-HPV16 Pseudotyped GFP HPV16 GFP HEK293 FT
PSVG-HPV18 Pseudotyped GFP HPV18 GFP HEK293 FT
PSVG-HPV31 Pseudotyped GFP HPV31 GFP HEK293 FT
PSVG-HPV33 Pseudotyped GFP HPV33 GFP HEK293 FT
PSVG-HPV35 Pseudotyped GFP HPV35 GFP HEK293 FT
PSVG-HPV39 Pseudotyped GFP HPV39 GFP HEK293 FT
PSVG-HPV45 Pseudotyped GFP HPV45 GFP HEK293 FT
PSVG-HPV51 Pseudotyped GFP HPV51 GFP HEK293 FT
PSVG-HPV52 Pseudotyped GFP HPV52 GFP HEK293 FT
PSVG-HPV56 Pseudotyped GFP HPV56 GFP HEK293 FT
PSVG-HPV58 Pseudotyped GFP HPV58 GFP HEK293 FT
PSVG-HPV59 Pseudotyped GFP HPV59 GFP HEK293 FT
PSVG-HPV68 Pseudotyped GFP HPV68 GFP HEK293 FT

Human papillomaviruses (HPVs) Introduction

Human papillomaviruses (HPVs) compose a group of more than 100 genotypes, which can result in cervical cancer and its precursor lesions. Currently, 12 types of HPV (16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, and 59) have been classified as carcinogenic types to humans and an additional 8 types are classified as possibly carcinogenic types to human. We can provide up to 15 different types of HPV pseudovirus, which include all 12 carcinogenic HPV types.

HPVs are double-stranded non-enveloped DNA viruses that infect keratinocytes of stratified squamous epithelia. There are roughly 8,000 base pairs inside the HPV genome to encode 8 essential proteins for completion of the viral life cycle.

L1 (major) and L2 (minor) capsid proteins, encoded by two late genes, can form an icosahedral lattice around the HPV genome. Over-expression of L1 and L2 proteins are needed for the self-assembly of viral particles. While L1 protein alone is able to form native capsids, the DNA encapsidation process does require L2 proteins. Codon optimization of L1 and L2 DNA sequences were found to increase protein expression by about 100-fold, enabling the production of high titer stocks.

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