Literature DB >> 23499476

Multipotent mesenchymal stromal cells decrease transforming growth factor β1 expression in microglia/macrophages and down-regulate plasminogen activator inhibitor 1 expression in astrocytes after stroke.

Hongqi Xin1, Michael Chopp, Li Hong Shen, Rui Lan Zhang, Li Zhang, Zheng Gang Zhang, Yi Li.   

Abstract

Multipotent mesenchymal stromal cells (MSCs) decrease the expression of transforming growth factor β1 (TGFβ1) in astrocytes and subsequently decrease astrocytic plasminogen activator inhibitor 1 (PAI-1) level in an autocrine manner. Since activated microglia/macrophages are also a source of TGFβ1 after stroke, we therefore tested whether MSCs regulate TGFβ1 expression in microglia/macrophages and subsequently alters PAI-1 expression after ischemia. TGFβ1 and its downstream effector phosphorylated SMAD 2/3 (p-SMAD 2/3) were measured in mice subjected to middle cerebral artery occlusion (MCAo). MSC treatment significantly decreased TGFβ1 protein expression in both astrocytes and microglia/macrophages in the ischemic boundary zone (IBZ) at day 14 after stroke. However, the p-SMAD 2/3 was only detected in astrocytes and decreased after MSC treatment. In vitro, RT-PCR results showed that the TGFβ1 mRNA level was increased in both astrocytes and microglia/macrophages in an astrocyte-microglia/macrophage co-culture system after oxygen-glucose deprived (OGD) treatment. MSCs treatment significantly decreased the above TGFβ1 mRNA level under OGD conditions, respectively. OGD increased the PAI-1 mRNA in astrocytes in the astrocyte-microglia/macrophage co-culture system, and MSC administration significantly decreased this level. PAI-1 mRNA was very low in microglia/macrophages compared with that in astrocytes under different conditions. Western blot results also verified that MSC administration significantly decreased p-SMAD 2/3 and PAI-1 level in astrocytes in astrocyte-microglia/macrophage co-culture system under OGD conditions. Our in vivo and in vitro data, in concert, suggest that MSCs decrease TGFβ1 expression in microglia/macrophages in the IBZ which contribute to the down-regulation of PAI-1 level in astrocytes. Published by Elsevier Ireland Ltd.

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Year:  2013        PMID： 23499476      PMCID： PMC3678739          DOI： 10.1016/j.neulet.2013.02.046

Source DB:  PubMed          Journal:  Neurosci Lett        ISSN： 0304-3940            Impact factor:   3.046


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