A model for targeting colon carcinoma cells using single-chain variable fragments anchored on virus-like particles via glycosyl phosphatidylinositol anchor.

Abstract:

PURPOSE:VLPs displaying tumor targeting single-chain variable fragments (VLP-rscFvs) which targets tumor-associated glycoprotein-72 (TAG-72) marker protein have a potential for immunotherapy against colon carcinoma tumors. In this study, scFvs anchored on VLPs using glycosylphosphatidylinositol (GPI) were prepared to target colon carcinoma spheroids in vitro. METHODS:VLPs-rscFvs were produced by co-injecting two types of Bombyx mori nucleopolyhedrovirus (BmNPV) bacmids, encoding RSV-gag and rscFvs cDNA into silkworm larvae. Large unilamellar vesicles (LUVs) of 100 nm in diameter were made using 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and packaged with Sulforhodamine B (SRB). LUV-SRB was used to associate with VLP-rscFvs assisted by GP64 present on VLP-rscFvs to produce VLP-rscFv associated SRB (VLP-rscFvs-SRB) at pH 7.5. RESULTS:The antigenicity of the purified VLPs-rScFvs was confirmed by enzyme-linked immunosorbent assay (ELISA) using TAG-72 as antigen. LUV-SRB made of DOPC was used to associate with 100 μg of VLP-rscFvs to produce VLP-rscFv-SRB. Specific delivery and penetration of SRB up to 100 μm into the spheroids shows the potential of the new model. CONCLUSIONS:The current study demonstrated the display, expression and purification of VLP-rscFvs efficiently. As a test model VLP-rscFv-SRB were prepared which can be used for immunotherapy. rscFvs provide the specificity needed to target tumors and VLPs serve as carrier transporting the dye to target.

journal_name

Pharm Res

journal_title

Pharmaceutical research

authors

Deo VK,Yui M,Alam J,Yamazaki M,Kato T,Park EY

doi

10.1007/s11095-014-1316-4

subject

Has Abstract

pub_date

2014-08-01 00:00:00

pages

2166-77

issue

8

eissn

0724-8741

issn

1573-904X

journal_volume

31

pub_type

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