IL-4 is the key regulator in herpes simplex virus-based gene therapy of BALB/c experimental autoimmune encephalomyelitis.

Abstract:

:Local delivery of cytokines or other immunomodulatory components has been applied as a potential therapy for experimental autoimmune encephalomyelitis (EAE), which is used as a model of human multiple sclerosis. We have used herpes simplex virus-based vectors expressing Th2 cytokines IL-4 and IL-10 and have previously shown a significant abolishment of disease symptoms by the virus expressing IL-4 (R8306), but not by the one expressing IL-10 (R8308). In the present study, the aim was to investigate the local and systemic cytokine response after HSV-based gene therapy. We show that the local expression of IL-4 from an HSV vector delivered to the brain converts the cytokine environment from the disease-promoting Th1-prominent to the disease-limiting IL-4 expressing type. We measured the expression of cytokines IL-4, IL-10, IFN-gamma, IL-12p35, IL-12p40 and the novel IL-23p19 from the brain by quantitative LightCycler RT-PCR. We also investigated the systemic cytokine response from the mouse sera. The results indicate that an increase in the Th2 cytokine IL-4 is observed if the diseased mice are treated with IL-4-expressing virus R8306. Surprisingly, the IL-23 expression of R8306 treated mice was at the same level as in the untreated EAE mice. On the contrary, in the R8308 (IL-10 expression) treated mice, the expression of IL-23 was decreased (P < 0.05). We conclude that the favorable effect of IL-4 on the disease development is more important than the downregulation of the Th1 type cytokines (like IL-23), and that IL-4 would be the key mediator of disease abolishment during gene therapy using these vectors.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Broberg EK,Salmi AA,Hukkanen V

doi

10.1016/j.neulet.2004.04.059

keywords:

subject

Has Abstract

pub_date

2004-07-08 00:00:00

pages

173-8

issue

3

eissn

0304-3940

issn

1872-7972

pii

S030439400400494X

journal_volume

364

pub_type

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