Macrophage-derived exosomes induce inflammatory factors in endothelial cells under hypertensive conditions

Mayuko Osada-Oka, Masayuki Shiota, Yasukatsu Izumi, Masaki Nishiyama, Masako Tanaka, Takehiro Yamaguchi, Emi Sakurai, Katsuyuki Miura, Hiroshi Iwao

研究成果: Article

23 引用 (Scopus)

抄録

Hypertension is one of the most important cardiovascular risk factors and results in macrophage infiltration of blood vessels. However, how macrophages coordinate inflammatory responses with endothelial cells (ECs) remains unclear. In this study, we investigated whether exosomes upregulate the expression of inflammatory factors in ECs under hypertensive conditions. Hypertension was induced in rats by continuous infusion of angiotensin II (Ang II). Exosomes were purified from rat serum by density gradient and ultracentrifugation and used to stimulate human coronary artery ECs (HCAECs). Moreover, the interactions between HCAECs and exosomes from human THP-1-derived macrophages were analyzed. Administration of Ang II enhanced the expression of CD68, a macrophage marker, in rat hearts, suggesting enhanced infiltration of macrophages. In addition, the expression of intracellular adhesion molecule-1 (ICAM1) and plasminogen activator inhibitor-1 (PAI-1), a proinflammatory factor, was increased in hypertensive rat hearts compared with control rats. CD68 protein expression and an increase in the expression of some exosome markers were detected in exosomes from hypertensive rat serum. Moreover, the exosomes upregulated the expression levels of ICAM1 and PAI-1 in HCAECs. The level of miR-17, a negative regulator of ICAM1 expression, was markedly decreased in exosomes from hypertensive rat serum compared with exosomes from control rats. Interestingly, Ang II-stimulated THP-1-derived exosomes also enhanced the expression of ICAM1 and PAI-1 and contained reduced levels of miR-17 compared with exosomes from unstimulated cells. These results suggest that inflammation of ECs under hypertensive conditions is caused, at least in part, by macrophage-derived exosomes.

元の言語English
ページ(範囲)353-360
ページ数8
ジャーナルHypertension Research
40
発行部数4
DOI
出版物ステータスPublished - 2017 4 1
外部発表Yes

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Exosomes
Endothelial Cells
Macrophages
Plasminogen Activator Inhibitor 1
Angiotensin II
Coronary Vessels
Serum
Hypertension
Ultracentrifugation
Blood Vessels
Up-Regulation

Keywords

    ASJC Scopus subject areas

    • Internal Medicine
    • Physiology
    • Cardiology and Cardiovascular Medicine

    これを引用

    Macrophage-derived exosomes induce inflammatory factors in endothelial cells under hypertensive conditions. / Osada-Oka, Mayuko; Shiota, Masayuki; Izumi, Yasukatsu; Nishiyama, Masaki; Tanaka, Masako; Yamaguchi, Takehiro; Sakurai, Emi; Miura, Katsuyuki; Iwao, Hiroshi.

    :: Hypertension Research, 巻 40, 番号 4, 01.04.2017, p. 353-360.

    研究成果: Article

    Osada-Oka, M, Shiota, M, Izumi, Y, Nishiyama, M, Tanaka, M, Yamaguchi, T, Sakurai, E, Miura, K & Iwao, H 2017, 'Macrophage-derived exosomes induce inflammatory factors in endothelial cells under hypertensive conditions' Hypertension Research, 巻. 40, 番号 4, pp. 353-360. https://doi.org/10.1038/hr.2016.163
    Osada-Oka, Mayuko ; Shiota, Masayuki ; Izumi, Yasukatsu ; Nishiyama, Masaki ; Tanaka, Masako ; Yamaguchi, Takehiro ; Sakurai, Emi ; Miura, Katsuyuki ; Iwao, Hiroshi. / Macrophage-derived exosomes induce inflammatory factors in endothelial cells under hypertensive conditions. :: Hypertension Research. 2017 ; 巻 40, 番号 4. pp. 353-360.
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    AU - Osada-Oka, Mayuko

    AU - Shiota, Masayuki

    AU - Izumi, Yasukatsu

    AU - Nishiyama, Masaki

    AU - Tanaka, Masako

    AU - Yamaguchi, Takehiro

    AU - Sakurai, Emi

    AU - Miura, Katsuyuki

    AU - Iwao, Hiroshi

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    AB - Hypertension is one of the most important cardiovascular risk factors and results in macrophage infiltration of blood vessels. However, how macrophages coordinate inflammatory responses with endothelial cells (ECs) remains unclear. In this study, we investigated whether exosomes upregulate the expression of inflammatory factors in ECs under hypertensive conditions. Hypertension was induced in rats by continuous infusion of angiotensin II (Ang II). Exosomes were purified from rat serum by density gradient and ultracentrifugation and used to stimulate human coronary artery ECs (HCAECs). Moreover, the interactions between HCAECs and exosomes from human THP-1-derived macrophages were analyzed. Administration of Ang II enhanced the expression of CD68, a macrophage marker, in rat hearts, suggesting enhanced infiltration of macrophages. In addition, the expression of intracellular adhesion molecule-1 (ICAM1) and plasminogen activator inhibitor-1 (PAI-1), a proinflammatory factor, was increased in hypertensive rat hearts compared with control rats. CD68 protein expression and an increase in the expression of some exosome markers were detected in exosomes from hypertensive rat serum. Moreover, the exosomes upregulated the expression levels of ICAM1 and PAI-1 in HCAECs. The level of miR-17, a negative regulator of ICAM1 expression, was markedly decreased in exosomes from hypertensive rat serum compared with exosomes from control rats. Interestingly, Ang II-stimulated THP-1-derived exosomes also enhanced the expression of ICAM1 and PAI-1 and contained reduced levels of miR-17 compared with exosomes from unstimulated cells. These results suggest that inflammation of ECs under hypertensive conditions is caused, at least in part, by macrophage-derived exosomes.

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    KW - endothelial cells

    KW - endothelial cells

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    KW - exosomes

    KW - inflammation

    KW - inflammation

    KW - macrophages

    KW - macrophagesangiotensin II

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