Addition of a single E2 binding site to the human papillomavirus (HPV) type 16 long control region enhances killing of HPV positive cells via HPV E2 protein-regulated herpes simplex virus type 1 thymidine kinase-mediated suicide gene therapy.

Abstract:

:Human papillomavirus type 16 (HPV16) is associated with the development of anogenital cancers and their precursor lesions, intraepithelial neoplasia. Treatment strategies against HPV-induced intraepithelial neoplasia are not HPV specific and mostly consist of physical removal or ablation of lesions. We had previously designed an HPV-specific approach to kill HPV-infected cells by the herpes simplex virus type 1 thymidine kinase (TK) gene driven by HPV E2 binding to E2-binding sites (E2BS) in the native HPV16 long control region. E2-induced TK expression renders the cells sensitive to the prodrug ganciclovir. To optimize this therapeutic approach, we modified the native long control region by adding variable numbers of E2BS adjacent to E2BS4, resulting in greatly increased cell death in HPV-positive cell lines with variable levels of E2 protein expression and no reduction in HPV specificity. Our results showed maximum increase in TK expression and cell killing when one additional E2BS was added adjacent to E2BS. As HPV-infected patients also exhibit variable E2 expression across lesions and within a lesion, this approach may potentiate the clinical utility of the herpes simplex virus type 1 TK/ganciclovir therapeutic approach.

journal_name

Hum Gene Ther

journal_title

Human gene therapy

authors

Sharma R,Palefsky JM

doi

10.1089/hum.2009.115

subject

Has Abstract

pub_date

2010-07-01 00:00:00

pages

843-54

issue

7

eissn

1043-0342

issn

1557-7422

journal_volume

21

pub_type

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