Interleukin-21 expression in hippocampal astrocytes is enhanced following kainic acid-induced seizures.

Abstract:

OBJECTIVE:Interleukin-21 (IL-21) is a cytokine that is an important modulator of immune responses. However, its roles in epilepsy are not completely clear. Here, we investigated the expression and distribution of IL-21 in a kainic acid (KA)-induced acute seizure mouse model. MATERIALS AND METHODS:Mice (n = 146) were randomly divided into an age-matched group, PBS injection group, and a KA injection group. The KA-injected mice were evaluated at 1, 3, and 24 h post-injection. IL-21 mRNA and protein expression levels were measured using RT-PCR and western blotting. Immunohistochemistry and immunofluorescence staining were performed to further characterize the pattern and distribution of IL-21 expression. RESULTS:The IL-21 mRNA and protein expression levels in the hippocampal tissues of the KA-treated mice were significantly increased as early as 1 h compared with the age-matched mice and PBS-treated mice. After this time point, the expression was reduced, but it remained higher than the level in the PBS-treated mice (p < 0.01). Immunohistochemical staining showed that IL-21 expression was distributed throughout the hippocampus, including areas CA1 and CA3, the dentate gyrus and the hilus. Moreover, immunofluorescence further showed that in the hippocampi of the KA-treated mice, IL-21 was mainly expressed in GFAP-positive astrocytes rather than in NeuN-positive neurons or CD11b-positive microglia. SIGNIFICANCE:Our data suggest that an increase in astrocyte-derived IL-21 expression in hippocampal subregions following KA-induced seizures may have potent regulatory effects on epileptogenesis.

journal_name

Neurol Res

journal_title

Neurological research

authors

Xiong XY,Wang TG,Yang MH,Meng ZY,Yang QW,Wang FX

doi

10.1080/01616412.2015.1135557

subject

Has Abstract

pub_date

2016-02-01 00:00:00

pages

151-7

issue

2

eissn

0161-6412

issn

1743-1328

journal_volume

38

pub_type

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