Ablation of Myeloid ADK (Adenosine Kinase) Epigenetically Suppresses Atherosclerosis in ApoE-/- (Apolipoprotein E Deficient) Mice

Min Zhang, Xianqiu Zeng, Qiuhua Yang, Jiean Xu, Zhiping Liu, Yaqi Zhou, Yapeng Cao, Xiaoyu Zhang, Xiaofei An, Yiming Xu, Lei Huang, Zhen Han, Tao Wang, Chaodong Wu, David J Fulton, Neal Lee Weintraub, Mei Hong, Yuqing Huo

Research output: Contribution to journalArticle

Abstract

Objective- Monocyte-derived foam cells are one of the key players in the formation of atherosclerotic plaques. Adenosine receptors and extracellular adenosine have been demonstrated to modulate foam cell formation. ADK (adenosine kinase) is a major enzyme regulating intracellular adenosine levels, but its functional role in myeloid cells remains poorly understood. To enhance intracellular adenosine levels in myeloid cells, ADK was selectively deleted in novel transgenic mice using Cre-LoxP technology, and foam cell formation and the development of atherosclerotic lesions were determined. Approach and Results- ADK was upregulated in macrophages on ox-LDL (oxidized low-density lipoprotein) treatment in vitro and was highly expressed in foam cells in atherosclerotic plaques. Atherosclerotic mice deficient in ADK in myeloid cells were generated by breeding floxed ADK (ADKF/F) mice with LysM-Cre (myeloid-specific Cre recombinase expressing) mice and ApoE-/- (apolipoprotein E deficient) mice. Mice absent ADK in myeloid cells exhibited much smaller atherosclerotic plaques compared with controls. In vitro assays showed that ADK deletion or inhibition resulted in increased intracellular adenosine and reduced DNA methylation of the ABCG1 (ATP-binding cassette transporter G1) gene. Loss of methylation was associated with ABCG1 upregulation, enhanced cholesterol efflux, and eventually decreased foam cell formation. Conclusions- Augmentation of intracellular adenosine levels through ADK knockout in myeloid cells protects ApoE-/- mice against atherosclerosis by reducing foam cell formation via the epigenetic regulation of cholesterol trafficking. ADK inhibition is a promising approach for the treatment of atherosclerotic diseases.

Original languageEnglish (US)
Pages (from-to)2780-2792
Number of pages13
JournalArteriosclerosis, thrombosis, and vascular biology
Volume38
Issue number12
DOIs
StatePublished - Dec 1 2018

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Adenosine Kinase
Apolipoproteins E
Atherosclerosis
Foam Cells
Myeloid Cells
Adenosine
Atherosclerotic Plaques
ATP-Binding Cassette Transporters
Cholesterol
Purinergic P1 Receptors
DNA Methylation
Epigenomics
Methylation
Transgenic Mice
Breeding
Monocytes
Up-Regulation
Macrophages
Technology

Keywords

  • atherosclerosis
  • cholesterol efflux
  • foam cell
  • gene methylation

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Cite this

Ablation of Myeloid ADK (Adenosine Kinase) Epigenetically Suppresses Atherosclerosis in ApoE-/- (Apolipoprotein E Deficient) Mice. / Zhang, Min; Zeng, Xianqiu; Yang, Qiuhua; Xu, Jiean; Liu, Zhiping; Zhou, Yaqi; Cao, Yapeng; Zhang, Xiaoyu; An, Xiaofei; Xu, Yiming; Huang, Lei; Han, Zhen; Wang, Tao; Wu, Chaodong; Fulton, David J; Weintraub, Neal Lee; Hong, Mei; Huo, Yuqing.

In: Arteriosclerosis, thrombosis, and vascular biology, Vol. 38, No. 12, 01.12.2018, p. 2780-2792.

Research output: Contribution to journalArticle

Zhang, Min ; Zeng, Xianqiu ; Yang, Qiuhua ; Xu, Jiean ; Liu, Zhiping ; Zhou, Yaqi ; Cao, Yapeng ; Zhang, Xiaoyu ; An, Xiaofei ; Xu, Yiming ; Huang, Lei ; Han, Zhen ; Wang, Tao ; Wu, Chaodong ; Fulton, David J ; Weintraub, Neal Lee ; Hong, Mei ; Huo, Yuqing. / Ablation of Myeloid ADK (Adenosine Kinase) Epigenetically Suppresses Atherosclerosis in ApoE-/- (Apolipoprotein E Deficient) Mice. In: Arteriosclerosis, thrombosis, and vascular biology. 2018 ; Vol. 38, No. 12. pp. 2780-2792.
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abstract = "Objective- Monocyte-derived foam cells are one of the key players in the formation of atherosclerotic plaques. Adenosine receptors and extracellular adenosine have been demonstrated to modulate foam cell formation. ADK (adenosine kinase) is a major enzyme regulating intracellular adenosine levels, but its functional role in myeloid cells remains poorly understood. To enhance intracellular adenosine levels in myeloid cells, ADK was selectively deleted in novel transgenic mice using Cre-LoxP technology, and foam cell formation and the development of atherosclerotic lesions were determined. Approach and Results- ADK was upregulated in macrophages on ox-LDL (oxidized low-density lipoprotein) treatment in vitro and was highly expressed in foam cells in atherosclerotic plaques. Atherosclerotic mice deficient in ADK in myeloid cells were generated by breeding floxed ADK (ADKF/F) mice with LysM-Cre (myeloid-specific Cre recombinase expressing) mice and ApoE-/- (apolipoprotein E deficient) mice. Mice absent ADK in myeloid cells exhibited much smaller atherosclerotic plaques compared with controls. In vitro assays showed that ADK deletion or inhibition resulted in increased intracellular adenosine and reduced DNA methylation of the ABCG1 (ATP-binding cassette transporter G1) gene. Loss of methylation was associated with ABCG1 upregulation, enhanced cholesterol efflux, and eventually decreased foam cell formation. Conclusions- Augmentation of intracellular adenosine levels through ADK knockout in myeloid cells protects ApoE-/- mice against atherosclerosis by reducing foam cell formation via the epigenetic regulation of cholesterol trafficking. ADK inhibition is a promising approach for the treatment of atherosclerotic diseases.",
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AU - Zhang, Min

AU - Zeng, Xianqiu

AU - Yang, Qiuhua

AU - Xu, Jiean

AU - Liu, Zhiping

AU - Zhou, Yaqi

AU - Cao, Yapeng

AU - Zhang, Xiaoyu

AU - An, Xiaofei

AU - Xu, Yiming

AU - Huang, Lei

AU - Han, Zhen

AU - Wang, Tao

AU - Wu, Chaodong

AU - Fulton, David J

AU - Weintraub, Neal Lee

AU - Hong, Mei

AU - Huo, Yuqing

PY - 2018/12/1

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N2 - Objective- Monocyte-derived foam cells are one of the key players in the formation of atherosclerotic plaques. Adenosine receptors and extracellular adenosine have been demonstrated to modulate foam cell formation. ADK (adenosine kinase) is a major enzyme regulating intracellular adenosine levels, but its functional role in myeloid cells remains poorly understood. To enhance intracellular adenosine levels in myeloid cells, ADK was selectively deleted in novel transgenic mice using Cre-LoxP technology, and foam cell formation and the development of atherosclerotic lesions were determined. Approach and Results- ADK was upregulated in macrophages on ox-LDL (oxidized low-density lipoprotein) treatment in vitro and was highly expressed in foam cells in atherosclerotic plaques. Atherosclerotic mice deficient in ADK in myeloid cells were generated by breeding floxed ADK (ADKF/F) mice with LysM-Cre (myeloid-specific Cre recombinase expressing) mice and ApoE-/- (apolipoprotein E deficient) mice. Mice absent ADK in myeloid cells exhibited much smaller atherosclerotic plaques compared with controls. In vitro assays showed that ADK deletion or inhibition resulted in increased intracellular adenosine and reduced DNA methylation of the ABCG1 (ATP-binding cassette transporter G1) gene. Loss of methylation was associated with ABCG1 upregulation, enhanced cholesterol efflux, and eventually decreased foam cell formation. Conclusions- Augmentation of intracellular adenosine levels through ADK knockout in myeloid cells protects ApoE-/- mice against atherosclerosis by reducing foam cell formation via the epigenetic regulation of cholesterol trafficking. ADK inhibition is a promising approach for the treatment of atherosclerotic diseases.

AB - Objective- Monocyte-derived foam cells are one of the key players in the formation of atherosclerotic plaques. Adenosine receptors and extracellular adenosine have been demonstrated to modulate foam cell formation. ADK (adenosine kinase) is a major enzyme regulating intracellular adenosine levels, but its functional role in myeloid cells remains poorly understood. To enhance intracellular adenosine levels in myeloid cells, ADK was selectively deleted in novel transgenic mice using Cre-LoxP technology, and foam cell formation and the development of atherosclerotic lesions were determined. Approach and Results- ADK was upregulated in macrophages on ox-LDL (oxidized low-density lipoprotein) treatment in vitro and was highly expressed in foam cells in atherosclerotic plaques. Atherosclerotic mice deficient in ADK in myeloid cells were generated by breeding floxed ADK (ADKF/F) mice with LysM-Cre (myeloid-specific Cre recombinase expressing) mice and ApoE-/- (apolipoprotein E deficient) mice. Mice absent ADK in myeloid cells exhibited much smaller atherosclerotic plaques compared with controls. In vitro assays showed that ADK deletion or inhibition resulted in increased intracellular adenosine and reduced DNA methylation of the ABCG1 (ATP-binding cassette transporter G1) gene. Loss of methylation was associated with ABCG1 upregulation, enhanced cholesterol efflux, and eventually decreased foam cell formation. Conclusions- Augmentation of intracellular adenosine levels through ADK knockout in myeloid cells protects ApoE-/- mice against atherosclerosis by reducing foam cell formation via the epigenetic regulation of cholesterol trafficking. ADK inhibition is a promising approach for the treatment of atherosclerotic diseases.

KW - atherosclerosis

KW - cholesterol efflux

KW - foam cell

KW - gene methylation

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