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Group V Secretory Phospholipase A(2) Regulates Endocytosis of Acetylated LDL by Transcriptional Activation of PGK1 in RAW264.7 Macrophage Cell Line
Aims: It was suggested that group V secretory phospholipase A(2) (sPLA(2)-V) existed in the nucleus. This study examined whether nuclear sPLA(2)-V plays a role in endocytosis of acetylated low-density lipoprotein (AcLDL) in monocyte/macrophage-like cell line RAW264.7 cells. Methods: RAW264.7 cells w...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Japan Atherosclerosis Society
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9135649/ https://www.ncbi.nlm.nih.gov/pubmed/33775979 http://dx.doi.org/10.5551/jat.62216 |
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author | Fujioka, Daisuke Watanabe, Yosuke Nakamura, Takamitsu Yokoyama, Takashi Miyazawa, Keiji Murakami, Makoto Kugiyama, Kiyotaka |
author_facet | Fujioka, Daisuke Watanabe, Yosuke Nakamura, Takamitsu Yokoyama, Takashi Miyazawa, Keiji Murakami, Makoto Kugiyama, Kiyotaka |
author_sort | Fujioka, Daisuke |
collection | PubMed |
description | Aims: It was suggested that group V secretory phospholipase A(2) (sPLA(2)-V) existed in the nucleus. This study examined whether nuclear sPLA(2)-V plays a role in endocytosis of acetylated low-density lipoprotein (AcLDL) in monocyte/macrophage-like cell line RAW264.7 cells. Methods: RAW264.7 cells were transfected with shRNA vector targeting sPLA(2)-V (sPLA(2)-V-knockdown [KD] cells) or empty vector (sPLA(2)-V-wild-type [WT] cells). AcLDL endocytosis was assessed by incubation with(125)I-AcLDL or AcLDL conjugated with pHrodo. Actin polymerization was assessed by flow cytometry using Alexa Fluor 546-phalloidin. Results: In immunofluorescence microscopic studies, sPLA(2)-V was detected in the nucleus. ChIP-Seq and ChIP-qPCR analyses showed binding of sPLA(2)-V to the promoter region of thephosphoglycerate kinase 1 (Pgk1) gene. In the promoter assay, sPLA(2)-V-KD cells had lower promoter activity of thePgk1 gene than sPLA(2)-V-WT cells, and this decrease could be reversed by transfection with a vector encoding sPLA(2)-V-H48Q that lacks enzymatic activity. Compared with sPLA(2)-V-WT cells, sPLA(2)-V-KD cells had decreased PGK1 protein expression, beclin 1 (Beclin1) phosphorylation at S30, and class III PI3-kinase activity that could also be restored by transfection with sPLA(2)-V-H48Q. sPLA(2)-V-KD cells had impaired actin polymerization and endocytosis, which was reversed by introduction of sPLA(2)-V-H48Q or PGK1 overexpression. In sPLA(2)-V-WT cells, siRNA-mediated depletion of PGK1 suppressed Beclin1 phosphorylation and impaired actin polymerization and intracellular trafficking of pHrodo-conjugated AcLDL. Conclusions: Nuclear sPLA(2)-V binds to thePgk1 gene promoter region and increases its transcriptional activity. sPLA(2)-V regulates AcLDL endocytosis through PGK1-Beclin1 in a manner that is independent of its enzymatic activity in RAW264.7 cells. |
format | Online Article Text |
id | pubmed-9135649 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Japan Atherosclerosis Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-91356492022-06-04 Group V Secretory Phospholipase A(2) Regulates Endocytosis of Acetylated LDL by Transcriptional Activation of PGK1 in RAW264.7 Macrophage Cell Line Fujioka, Daisuke Watanabe, Yosuke Nakamura, Takamitsu Yokoyama, Takashi Miyazawa, Keiji Murakami, Makoto Kugiyama, Kiyotaka J Atheroscler Thromb Original Article Aims: It was suggested that group V secretory phospholipase A(2) (sPLA(2)-V) existed in the nucleus. This study examined whether nuclear sPLA(2)-V plays a role in endocytosis of acetylated low-density lipoprotein (AcLDL) in monocyte/macrophage-like cell line RAW264.7 cells. Methods: RAW264.7 cells were transfected with shRNA vector targeting sPLA(2)-V (sPLA(2)-V-knockdown [KD] cells) or empty vector (sPLA(2)-V-wild-type [WT] cells). AcLDL endocytosis was assessed by incubation with(125)I-AcLDL or AcLDL conjugated with pHrodo. Actin polymerization was assessed by flow cytometry using Alexa Fluor 546-phalloidin. Results: In immunofluorescence microscopic studies, sPLA(2)-V was detected in the nucleus. ChIP-Seq and ChIP-qPCR analyses showed binding of sPLA(2)-V to the promoter region of thephosphoglycerate kinase 1 (Pgk1) gene. In the promoter assay, sPLA(2)-V-KD cells had lower promoter activity of thePgk1 gene than sPLA(2)-V-WT cells, and this decrease could be reversed by transfection with a vector encoding sPLA(2)-V-H48Q that lacks enzymatic activity. Compared with sPLA(2)-V-WT cells, sPLA(2)-V-KD cells had decreased PGK1 protein expression, beclin 1 (Beclin1) phosphorylation at S30, and class III PI3-kinase activity that could also be restored by transfection with sPLA(2)-V-H48Q. sPLA(2)-V-KD cells had impaired actin polymerization and endocytosis, which was reversed by introduction of sPLA(2)-V-H48Q or PGK1 overexpression. In sPLA(2)-V-WT cells, siRNA-mediated depletion of PGK1 suppressed Beclin1 phosphorylation and impaired actin polymerization and intracellular trafficking of pHrodo-conjugated AcLDL. Conclusions: Nuclear sPLA(2)-V binds to thePgk1 gene promoter region and increases its transcriptional activity. sPLA(2)-V regulates AcLDL endocytosis through PGK1-Beclin1 in a manner that is independent of its enzymatic activity in RAW264.7 cells. Japan Atherosclerosis Society 2022-05-01 2021-03-27 /pmc/articles/PMC9135649/ /pubmed/33775979 http://dx.doi.org/10.5551/jat.62216 Text en 2022 Japan Atherosclerosis Society https://creativecommons.org/licenses/by-nc-sa/4.0/This article is distributed under the terms of the latest version of CC BY-NC-SA defined by the Creative Commons Attribution License.http://creativecommons.org/licenses/by-nc-sa/4.0/ (https://creativecommons.org/licenses/by-nc-sa/4.0/) |
spellingShingle | Original Article Fujioka, Daisuke Watanabe, Yosuke Nakamura, Takamitsu Yokoyama, Takashi Miyazawa, Keiji Murakami, Makoto Kugiyama, Kiyotaka Group V Secretory Phospholipase A(2) Regulates Endocytosis of Acetylated LDL by Transcriptional Activation of PGK1 in RAW264.7 Macrophage Cell Line |
title |
Group V Secretory Phospholipase A(2) Regulates Endocytosis of Acetylated LDL by Transcriptional Activation of PGK1 in RAW264.7 Macrophage Cell Line
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title_full |
Group V Secretory Phospholipase A(2) Regulates Endocytosis of Acetylated LDL by Transcriptional Activation of PGK1 in RAW264.7 Macrophage Cell Line
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title_fullStr |
Group V Secretory Phospholipase A(2) Regulates Endocytosis of Acetylated LDL by Transcriptional Activation of PGK1 in RAW264.7 Macrophage Cell Line
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title_full_unstemmed |
Group V Secretory Phospholipase A(2) Regulates Endocytosis of Acetylated LDL by Transcriptional Activation of PGK1 in RAW264.7 Macrophage Cell Line
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title_short |
Group V Secretory Phospholipase A(2) Regulates Endocytosis of Acetylated LDL by Transcriptional Activation of PGK1 in RAW264.7 Macrophage Cell Line
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title_sort | group v secretory phospholipase a(2) regulates endocytosis of acetylated ldl by transcriptional activation of pgk1 in raw264.7 macrophage cell line |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9135649/ https://www.ncbi.nlm.nih.gov/pubmed/33775979 http://dx.doi.org/10.5551/jat.62216 |
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