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Zheng Y, Shao M, Zheng Y, Sun W, Qin S, Sun Z, Zhu L, Guan Y, Wang Q, Wang Y, Li L. PPARs in atherosclerosis: The spatial and temporal features from mechanism to druggable targets. J Adv Res 2024:S2090-1232(24)00120-6. [PMID: 38555000 DOI: 10.1016/j.jare.2024.03.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/22/2024] [Accepted: 03/25/2024] [Indexed: 04/02/2024] Open
Abstract
BACKGROUND Atherosclerosis is a chronic and complex disease caused by lipid disorder, inflammation, and other factors. It is closely related to cardiovascular diseases, the chief cause of death globally. Peroxisome proliferator-activated receptors (PPARs) are valuable anti-atherosclerosis targets that showcase multiple roles at different pathological stages of atherosclerosis and for cell types at different tissue sites. AIM OF REVIEW Considering the spatial and temporal characteristics of the pathological evolution of atherosclerosis, the roles and pharmacological and clinical studies of PPARs were summarized systematically and updated under different pathological stages and in different vascular cells of atherosclerosis. Moreover, selective PPAR modulators and PPAR-pan agonists can exert their synergistic effects meanwhile reducing the side effects, thereby providing novel insight into future drug development for precise spatial-temporal therapeutic strategy of anti-atherosclerosis targeting PPARs. KEY SCIENTIFIC Concepts of Review: Based on the spatial and temporal characteristics of atherosclerosis, we have proposed the importance of stage- and cell type-dependent precision therapy. Initially, PPARs improve endothelial cells' dysfunction by inhibiting inflammation and oxidative stress and then regulate macrophages' lipid metabolism and polarization to improve fatty streak. Finally, PPARs reduce fibrous cap formation by suppressing the proliferation and migration of vascular smooth muscle cells (VSMCs). Therefore, research on the cell type-specific mechanisms of PPARs can provide the foundation for space-time drug treatment. Moreover, pharmacological studies have demonstrated that several drugs or compounds can exert their effects by the activation of PPARs. Selective PPAR modulators (that specifically activate gene subsets of PPARs) can exert tissue and cell-specific effects. Furthermore, the dual- or pan-PPAR agonist could perform a better role in balancing efficacy and side effects. Therefore, research on cells/tissue-specific activation of PPARs and PPAR-pan agonists can provide the basis for precision therapy and drug development of PPARs.
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Affiliation(s)
- Yi Zheng
- School of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Mingyan Shao
- National Institute of TCM Constitution and Preventive Medicine, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Yanfei Zheng
- National Institute of TCM Constitution and Preventive Medicine, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Wenlong Sun
- Institute of Biomedical Research, School of Life Sciences and Medicine, Shandong University of Technology, Zibo 255000, China
| | - Si Qin
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha 410128, China
| | - Ziwei Sun
- National Institute of TCM Constitution and Preventive Medicine, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Linghui Zhu
- Institute of Basic Theory for Chinese Medicine, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Yuanyuan Guan
- School of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Qi Wang
- National Institute of TCM Constitution and Preventive Medicine, Beijing University of Chinese Medicine, Beijing 100029, China.
| | - Yong Wang
- School of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, China; First School of Clinical Medicine, Yunnan University of Chinese Medicine, Kunming 650500, China.
| | - Lingru Li
- National Institute of TCM Constitution and Preventive Medicine, Beijing University of Chinese Medicine, Beijing 100029, China.
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Witz A, Effertz D, Goebel N, Schwab M, Franke UFW, Torzewski M. Pro-Calcifying Role of Enzymatically Modified LDL (eLDL) in Aortic Valve Sclerosis via Induction of IL-6 and IL-33. Biomolecules 2023; 13:1091. [PMID: 37509127 PMCID: PMC10377083 DOI: 10.3390/biom13071091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 06/25/2023] [Accepted: 07/03/2023] [Indexed: 07/30/2023] Open
Abstract
One of the contributors to atherogenesis is enzymatically modified LDL (eLDL). eLDL was detected in all stages of aortic valve sclerosis and was demonstrated to trigger the activation of p38 mitogen-activated protein kinase (p38 MAPK), which has been identified as a pro-inflammatory protein in atherosclerosis. In this study, we investigated the influence of eLDL on IL-6 and IL-33 induction, and also the impact of eLDL on calcification in aortic valve stenosis (AS). eLDL upregulated phosphate-induced calcification in valvular interstitial cells (VICs)/myofibroblasts isolated from diseased aortic valves, as demonstrated by alizarin red staining. Functional studies demonstrated activation of p38 MAPK as well as an altered gene expression of osteogenic genes known to be involved in vascular calcification. In parallel with the activation of p38 MAPK, eLDL also induced upregulation of the cytokines IL-6 and IL-33. The results suggest a pro-calcifying role of eLDL in AS via induction of IL-6 and IL-33.
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Affiliation(s)
- Annemarie Witz
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany
| | - Denise Effertz
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany
| | - Nora Goebel
- Department of Cardiovascular Surgery, Robert-Bosch-Hospital, 70376 Stuttgart, Germany
| | - Matthias Schwab
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany
- Department of Clinical Pharmacology, University of Tuebingen, 72076 Tuebingen, Germany
- Department of Biochemistry and Pharmacy, University of Tuebingen, 72076 Tuebingen, Germany
| | - Ulrich F W Franke
- Department of Cardiovascular Surgery, Robert-Bosch-Hospital, 70376 Stuttgart, Germany
| | - Michael Torzewski
- Department of Laboratory Medicine and Hospital Hygiene, Robert-Bosch-Hospital, 70376 Stuttgart, Germany
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Zhang C, Wu X, Shi P, Ma H, Fang F, Feng Q, Zhao S, Zhang R, Huang J, Xu X, Xiao W, Cao G, Ji X. Diterpenoids inhibit ox-LDL-induced foam cell formation in RAW264.7 cells by promoting ABCA1 mediated cholesterol efflux. Front Pharmacol 2023; 14:1066758. [PMID: 36713845 PMCID: PMC9877220 DOI: 10.3389/fphar.2023.1066758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 01/02/2023] [Indexed: 01/15/2023] Open
Abstract
Introduction: Atherosclerosis is the main cause of many cardiovascular diseases and contributes to morbidity and mortality worldwide. The formation of macrophage-derived foam cells plays a critical role in the early stage of atherosclerosis pathogenesis. Diterpenoids found in the flowers of Callicarpa rubella Lindl., a traditional Chinese medicine, have been reported to have anti-inflammatory activity. However, little is known about the effects of these diterpenoids on macrophage foam cell formation. Methods: A macrophage-derived foam cell formation model was established by treating RAW264.7 cells with oxidized low-density lipoprotein (ox-LDL) for 24 h. Oil red O staining were used to detect the intracellular lipids. The cholesterol efflux capacity was assayed by labeling cells with 22-NBD-cholesterol. Western blots and real-time PCRs were performed to quantify protein and mRNA expressions. Results: Two diterpenoid molecules, 14α-hydroxyisopimaric acid (C069002) and isopimaric acid (C069004), extracted from the flowers of Callicarpa rubella Lindl., significantly attenuated ox-LDL-induced foam cell formation in RAW264.7 macrophages. Further investigation showed that these two diterpenoids could promote cholesterol efflux from RAW264.7 macrophages to apolipoprotein A-I or high-density lipoproteins, which was associated with upregulated expression of ATP-binding cassette A1/G1 (ABCA1/G1), liver X receptor-α (LXRα), and peroxisome proliferator-activated receptor-γ (PPARγ). Unexpectedly, the diterpenoids C069002 and C069004 failed to enhance the mRNA transcription of the ABCG1 gene in macrophage-derived foam cells induced by ox-LDL. To evaluate the effects of diterpenoids on macrophage foam cell formation and determine the underlying mechanism, two drugs (lovastatin and rosiglitazone) were used as positive controls. Although both drugs could reduce macrophage foam cell formation and promote cholesterol efflux, they each had distinctive abilities to modulate the expression of cholesterol efflux-related genes. In contrast to lovastatin, rosiglitazone showed a similar influence on the expression of cholesterol efflux-related genes (including ABCA1, LXRα, and PPARγ) as the diterpenoids regardless of the presence or absence of ox-LDL, implying a similar mechanism by which they may exert atheroprotective effects. Conclusion: Our research indicates that diterpenoids effectively inhibit ox-LDL-induced macrophage foam cell formation by promoting cholesterol efflux from macrophages via the PPARγ-LXRα-ABCA1 pathway. Further investigation of diterpenoids as potential drugs for the treatment of atherosclerosis is warranted.
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Affiliation(s)
- Cheng Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China
| | - Xuewen Wu
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China
| | - Pengmin Shi
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China
| | - Hongyu Ma
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China
| | - Fei Fang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China
| | - Qianlang Feng
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China
| | - Shuang Zhao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China
| | - Ruipu Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China
| | - Jinyuan Huang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China
| | - Xinting Xu
- Department of Pulmonary and Critical Care Medicine, Xi’an International Medical Center Hospital, Xi’an, China,*Correspondence: Xinting Xu, ; Weilie Xiao, ; Guang Cao, ; Xu Ji,
| | - Weilie Xiao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China,*Correspondence: Xinting Xu, ; Weilie Xiao, ; Guang Cao, ; Xu Ji,
| | - Guang Cao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China,*Correspondence: Xinting Xu, ; Weilie Xiao, ; Guang Cao, ; Xu Ji,
| | - Xu Ji
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research and Development of Natural Products, Yunnan Characteristic Plant Extraction Laboratory, Ministry of Education, School of Pharmacy, Yunnan University, Kunming, China,*Correspondence: Xinting Xu, ; Weilie Xiao, ; Guang Cao, ; Xu Ji,
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Wu X, Cheng B, Guo X, Wu Q, Sun S, He P. PPARα/γ signaling pathways are involved in Chlamydia pneumoniae-induced foam cell formation via upregulation of SR-A1 and ACAT1 and downregulation of ABCA1/G1. Microb Pathog 2021; 161:105284. [PMID: 34767930 DOI: 10.1016/j.micpath.2021.105284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 10/10/2021] [Accepted: 11/04/2021] [Indexed: 12/12/2022]
Abstract
Chlamydia pneumoniae (Cpn) has been reported to be involved in the pathogenesis of early atherosclerosis by inducing macrophage-derived foam cell formation in the presence of low-density lipoprotein (LDL). However, the biochemical mechanisms underlying Cpn-induced foam cell formation are still not fully elucidated. The present study showed that in LDL-treated THP-1-derived macrophages, Cpn not only upregulated the expression of scavenger receptor A1 (SR-A1) and acyl-coenzyme A: cholesterol acyltransferase 1 (ACAT1), but it also downregulated the expression of ATP binding cassette transporters (ABCA1 and ABCG1) at both the mRNA and protein levels. These processes facilitated cholesterol accumulation and promoted macrophage-derived foam cell formation. Treatment with the peroxisome proliferator-activated receptor (PPAR)-γ agonist rosiglitazone or the PPARα agonist fenofibrate decreased the number of foam cells induced by Cpn, while the PPARγ antagonist GW9662, the PPARα antagonist MK886, or PPARα/γ siRNAs enhanced the effect of Cpn on foam cell formation and gene expression of SR-A1, ACAT1, and ABCA1/G1. Moreover, the PPARγ agonist rosiglitazone reversed the downregulation of CD36 by Cpn, while PPARγ siRNA and the PPARγ inhibitor GW9662 further suppressed CD36 expression. However, the PPARα agonist, inhibitor, and siRNA all showed no effect on CD36 expression. In conclusion, the PPARα and PPARγ pathways are both involved in Cpn-induced macrophage-derived foam cell formation by upregulating SR-A1 and ACAT1 and downregulating ABCA1/G1 expression.
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Affiliation(s)
- Xiaohua Wu
- Department of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China; Department of Geriatrics, Zhoushan Hospital, Wenzhou Medical University, Zhoushan, 316021, China
| | - Bei Cheng
- Department of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Xiaojuan Guo
- Department of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Qinqin Wu
- Department of Geriatrics, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Shan Sun
- Department of Geriatrics, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ping He
- Department of Geriatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
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Allen PE, Noland RC, Martinez JJ. Rickettsia conorii survival in THP-1 macrophages involves host lipid droplet alterations and active rickettsial protein production. Cell Microbiol 2021; 23:e13390. [PMID: 34464019 DOI: 10.1111/cmi.13390] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 08/25/2021] [Accepted: 08/27/2021] [Indexed: 12/29/2022]
Abstract
Rickettsia conorii is a Gram-negative, cytosolic intracellular bacterium that has classically been investigated in terms of endothelial cell infection. However, R. conorii and other human pathogenic Rickettsia species have evolved mechanisms to grow in various cell types, including macrophages, during mammalian infection. During infection of these phagocytes, R. conorii shifts the host cell's overall metabolism towards an anti-inflammatory M2 response, metabolically defined by an increase in host lipid metabolism and oxidative phosphorylation. Lipid metabolism has more recently been identified as a key regulator of host homeostasis through modulation of immune signalling and metabolism. Intracellular pathogens have adapted mechanisms of hijacking host metabolic pathways including host lipid catabolic pathways for various functions required for growth and survival. In the present study, we hypothesised that alterations of host lipid droplets initiated by lipid catabolic pathways during R. conorii infection is important for bacterial survival in macrophages. Herein, we determined that host lipid droplet modulation is initiated early during R. conorii infection, and these alterations rely on active bacteria and lipid catabolic pathways. We also find that these lipid catabolic pathways are essential for efficient bacterial survival. Unlike the mechanisms used by other intracellular pathogens, the catabolism of lipid droplets induced by R. conorii infection is independent of upstream host peroxisome proliferator-activated receptor-alpha (PPARα) signalling. Inhibition of PPARɣ signalling and lipid droplet accumulation in host cells cause a significant decrease in R. conorii survival suggesting a negative correlation with lipid droplet production and R. conorii survival. Together, these results strongly suggest that the modulation of lipid droplets in macrophage cells infected by R. conorii is an important and underappreciated aspect of the infection process. TAKE AWAYS: Host lipid droplets are differentially altered in early and replicative stages of THP-1 macrophage infection with R. conorii. Lipid droplet alterations are initiated in a bacterial-dependent manner and do not require host peroxisome proliferator-activated receptors α or ɣ activation. Pharmacological inhibition of host lipid catabolic processes during R. conorii infection indicates a requirement of lipid catabolism for bacterial survival and initiation of lipid droplet modulation. A significant increase in host lipid droplets during infection has a negative impact on R. conorii survival in THP-1 macrophages.
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Affiliation(s)
- Paige E Allen
- Vector Borne Disease Laboratories, Department of Pathobiological Sciences, LSU School of Veterinary Medicine, Baton Rouge, Louisiana, USA
| | - Robert C Noland
- Skeletal Muscle Metabolism Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana, USA
| | - Juan J Martinez
- Vector Borne Disease Laboratories, Department of Pathobiological Sciences, LSU School of Veterinary Medicine, Baton Rouge, Louisiana, USA
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Allen PE, Martinez JJ. Modulation of Host Lipid Pathways by Pathogenic Intracellular Bacteria. Pathogens 2020; 9:pathogens9080614. [PMID: 32731350 PMCID: PMC7460438 DOI: 10.3390/pathogens9080614] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 07/17/2020] [Accepted: 07/25/2020] [Indexed: 12/22/2022] Open
Abstract
Lipids are a broad group of molecules required for cell maintenance and homeostasis. Various intracellular pathogens have developed mechanisms of modulating and sequestering host lipid processes for a large array of functions for both bacterial and host cell survival. Among the host cell lipid functions that intracellular bacteria exploit for infection are the modulation of host plasma membrane microdomains (lipid rafts) required for efficient bacterial entry; the recruitment of specific lipids for membrane integrity of intracellular vacuoles; and the utilization of host lipid droplets for the regulation of immune responses and for energy production through fatty acid β-oxidation and oxidative phosphorylation. The majority of published studies on the utilization of these host lipid pathways during infection have focused on intracellular bacterial pathogens that reside within a vacuole during infection and, thus, have vastly different requirements for host lipid metabolites when compared to those intracellular pathogens that are released into the host cytosol upon infection. Here we summarize the mechanisms by which intracellular bacteria sequester host lipid species and compare the modulation of host lipid pathways and metabolites during host cell infection by intracellular pathogens residing in either a vacuole or within the cytosol of infected mammalian cells. This review will also highlight common and unique host pathways necessary for intracellular bacterial growth that could potentially be targeted for therapeutic intervention.
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Sun S, Duan X, Wu Q, He Y, Bu X, Ming X, Yan F, Zhu H. ERK1/2-PPARγ pathway is involved in Chlamydia pneumonia-induced human umbilical vein endothelial cell apoptosis through increased LOX-1 expression. J Recept Signal Transduct Res 2020; 40:126-132. [PMID: 32003295 DOI: 10.1080/10799893.2020.1719416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Chlamydia pneumonia (C.pn) is a common respiratory pathogen that is involved in human cardiovascular diseases and promotes the development of atherosclerosis in hyperlipidemic animal models. C.pn reportedly up-regulated lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1) in endothelial cells. Recently, the anti-atherosclerotic activity of peroxisome proliferator-activated receptor γ (PPARγ) has been documented. In the present study, we investigated the effect of C.pn on LOX-1 expression in human umbilical vein endothelial cells (HUVECs) and identified the involvement of the PPARγ signaling pathway therein. The results showed that C.pn increased the expression of LOX-1 in HUVECs in a dose- and time-dependent manner. C.pn-induced up-regulation of LOX-1 was mediated by ERK1/2, whereas p38 MAPK and JNK had no effect on this process. C.pn induced apoptosis, inhibited cell proliferation, and decreased the expression PPARγ in HUVECs. Additionally, LOX-1 activity and cell injury caused by C.pn through activation of ERK1/2 was completely inhibited by rosiglitazone, a PPARγ agonist. In conclusion, we inferred that activation of PPARγ in HUVECs suppressed C.pn-induced LOX-1 expression and cell damage by inhibiting ERK1/2 signaling.
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Affiliation(s)
- Shan Sun
- General Medicine, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xiaoyu Duan
- General Medicine, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Qinqin Wu
- General Medicine, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Yingxia He
- General Medicine, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xiaofen Bu
- General Medicine, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xiaoyan Ming
- General Medicine, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Fengqin Yan
- General Medicine, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Hong Zhu
- General Medicine, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
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Kortesoja M, Trofin RE, Hanski L. A platform for studying the transfer of Chlamydia pneumoniae infection between respiratory epithelium and phagocytes. J Microbiol Methods 2020; 171:105857. [PMID: 32006529 DOI: 10.1016/j.mimet.2020.105857] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 01/13/2020] [Accepted: 01/28/2020] [Indexed: 12/17/2022]
Abstract
The obligate intracellular bacterium, Chlamydia pneumoniae, has been identified as a risk factor for several chronic inflammatory diseases in addition to respiratory tract infections. The dissemination of C. pneumoniae from respiratory tract to secondary sites of infection occurs via infected monocyte / macrophage line cells, in which C. pneumoniae can persist as an antibiotic-refractory phenotype. To allow more detailed studies on the epithelium-monocyte/macrophage transition of the infection, new in vitro bioassays are needed. To this end, a coculture system with human continuous cell lines was established. Respiratory epithelial HL cells were infected with C. pneumoniae and THP-1 monocytes were added into the cultures at 67 h post infection. After a 5 h coculture, THP-1 cells were collected with a biotinylated HLA antibody and streptavidin-coated magnetic beads and C. pneumoniae genome copy numbers in THP-1 determined by quantitative PCR. The assay was optimized for cell densities, incubation time, THP-1 separation technique and buffer composition, and its robustness was demonstrated by a Z' value of 0.6. The mitogen-activated protein kinase (MAPK) inhibitors: SP600125 (JNK inhibitor), SB203580 (p38 inhibitor) and FR180204 (ERK inhibitor) suppressed the transfer of C. pneumoniae from HL to THP-1 cells, making them suitable positive controls for the assay. Based on analysis of separate steps of the process, the MAPK inhibitors suppress the bacterial entry to THP-1 cells. The transfer of C. pneumoniae from epithelium to phagocytes represents a crucial step in the establishment of persistent infections by this pathogen, and the presented methods enables future studies to block this process by therapeutic means.
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Affiliation(s)
- Maarit Kortesoja
- Drug Research Program, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, P.O. Box 56, FI-00014, Finland
| | - Raluca Elena Trofin
- Drug Research Program, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, P.O. Box 56, FI-00014, Finland; Faculty of Pharmacy, University of Bucharest, Bulevardul Regina Elisabeta 4-12, 030018 Bucharest, Romania
| | - Leena Hanski
- Drug Research Program, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, P.O. Box 56, FI-00014, Finland.
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Lipid Droplets: A Significant but Understudied Contributor of Host⁻Bacterial Interactions. Cells 2019; 8:cells8040354. [PMID: 30991653 PMCID: PMC6523240 DOI: 10.3390/cells8040354] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Revised: 04/05/2019] [Accepted: 04/12/2019] [Indexed: 12/13/2022] Open
Abstract
Lipid droplets (LDs) are cytosolic lipid storage organelles that are important for cellular lipid metabolism, energy homeostasis, cell signaling, and inflammation. Several bacterial, viral and protozoal pathogens exploit host LDs to promote infection, thus emphasizing the importance of LDs at the host–pathogen interface. In this review, we discuss the thus far reported relation between host LDs and bacterial pathogens including obligate and facultative intracellular bacteria, and extracellular bacteria. Although there is less evidence for a LD–extracellular bacterial interaction compared to interactions with intracellular bacteria, in this review, we attempt to compare the bacterial mechanisms that target LDs, the host signaling pathways involved and the utilization of LDs by these bacteria. Many intracellular bacteria employ unique mechanisms to target host LDs and potentially obtain nutrients and lipids for vacuolar biogenesis and/or immune evasion. However, extracellular bacteria utilize LDs to either promote host tissue damage or induce host death. We also identify several areas that require further investigation. Along with identifying LD interactions with bacteria besides the ones reported, the precise mechanisms of LD targeting and how LDs benefit pathogens should be explored for the bacteria discussed in the review. Elucidating LD–bacterial interactions promises critical insight into a novel host–pathogen interaction.
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Al-Atrache Z, Lopez DB, Hingley ST, Appelt DM. Astrocytes infected with Chlamydia pneumoniae demonstrate altered expression and activity of secretases involved in the generation of β-amyloid found in Alzheimer disease. BMC Neurosci 2019; 20:6. [PMID: 30786875 PMCID: PMC6383264 DOI: 10.1186/s12868-019-0489-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 02/12/2019] [Indexed: 12/12/2022] Open
Abstract
Background Epidemiologic studies strongly suggest that the pathophysiology of late-onset Alzheimer disease (AD) versus early-onset AD has environmental rather than genetic causes, thus revealing potentially novel therapeutic targets to limit disease progression. Several studies supporting the “pathogen hypothesis” of AD demonstrate a strong association between pathogens and the production of β-amyloid, the pathologic hallmark of AD. Although the mechanism of pathogen-induced neurodegeneration of AD remains unclear, astrocytes, a key player of the CNS innate immune response and producer/metabolizer of β-amyloid, have been implicated. We hypothesized that Chlamydia pneumoniae infection of human astrocytes alters the expression of the amyloid precursor protein (APP)-processing secretases, ADAM10, BACE1, and PSEN1, to promote β-amyloid formation. Utilizing immunofluorescent microscopy, molecular, and biochemical approaches, these studies explore the role of an intracellular respiratory pathogen, Chlamydia pneumoniae, as an environmental trigger for AD pathology. Human astrocytoma cells in vitro were infected with Chlamydia pneumoniae over the course of 6–72 h. The gene and protein expression, as well as the enzymatic activity of non-amyloidogenic (ADAM10), and pro-amyloidogenic (BACE1 and PSEN1) secretases were qualitatively and quantitatively assessed. In addition, the formation of toxic amyloid products as an outcome of pro-amyloidogenic APP processing was evaluated through various modalities. Results Chlamydia pneumoniae infection of human astrocytoma cells promoted the transcriptional upregulation of numerous genes implicated in host neuroinflammation, lipid homeostasis, microtubule function, and APP processing. Relative to that of uninfected astrocytes, BACE1 and PSEN1 protein levels were enhanced by nearly twofold at 48–72 h post-Chlamydia pneumoniae infection. The processing of APP in Chlamydia pneumoniae-infected astrocytes favors the pro-amyloidogenic pathway, as demonstrated by an increase in enzymatic activity of BACE1, while that of ADAM10 was decreased. Fluorescence intensity of β-amyloid and ELISA-quantified levels of soluble-APP by products revealed temporally similar increases, confirming a BACE1/PSEN1-mediated processing of APP. Conclusions Our findings suggest that Chlamydia pneumoniae infection of human astrocytes promotes the pro-amyloidogenic pathway of APP processing through the upregulation of expression and activity of β-secretase, upregulated expression of γ-secretase, and decreased activity of α-secretase. These effects of astrocyte infection provide evidence for a direct link between Chlamydia pneumoniae and AD pathology. Electronic supplementary material The online version of this article (10.1186/s12868-019-0489-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Zein Al-Atrache
- Department of Bio-Medical Sciences, Center for Chronic Disorders of Aging, Philadelphia College of Osteopathic Medicine, 4170 City Avenue, Philadelphia, PA, 19131, USA
| | - Danielle B Lopez
- Department of Bio-Medical Sciences, Center for Chronic Disorders of Aging, Philadelphia College of Osteopathic Medicine, 4170 City Avenue, Philadelphia, PA, 19131, USA
| | - Susan T Hingley
- Department of Bio-Medical Sciences, Center for Chronic Disorders of Aging, Philadelphia College of Osteopathic Medicine, 4170 City Avenue, Philadelphia, PA, 19131, USA
| | - Denah M Appelt
- Department of Bio-Medical Sciences, Center for Chronic Disorders of Aging, Philadelphia College of Osteopathic Medicine, 4170 City Avenue, Philadelphia, PA, 19131, USA.
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11
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Vallochi AL, Teixeira L, Oliveira KDS, Maya-Monteiro CM, Bozza PT. Lipid Droplet, a Key Player in Host-Parasite Interactions. Front Immunol 2018; 9:1022. [PMID: 29875768 PMCID: PMC5974170 DOI: 10.3389/fimmu.2018.01022] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 04/24/2018] [Indexed: 12/18/2022] Open
Abstract
Lipid droplets (lipid bodies, LDs) are dynamic organelles that have important roles in regulating lipid metabolism, energy homeostasis, cell signaling, membrane trafficking, and inflammation. LD biogenesis, composition, and functions are highly regulated and may vary according to the stimuli, cell type, activation state, and inflammatory environment. Increased cytoplasmic LDs are frequently observed in leukocytes and other cells in a number of infectious diseases. Accumulating evidence reveals LDs participation in fundamental mechanisms of host-pathogen interactions, including cell signaling and immunity. LDs are sources of eicosanoid production, and may participate in different aspects of innate signaling and antigen presentation. In addition, intracellular pathogens evolved mechanisms to subvert host metabolism and may use host LDs, as ways of immune evasion and nutrients source. Here, we review mechanisms of LDs biogenesis and their contributions to the infection progress, and discuss the latest discoveries on mechanisms and pathways involving LDs roles as regulators of the immune response to protozoan infection.
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Affiliation(s)
- Adriana Lima Vallochi
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil
| | | | | | | | - Patricia T. Bozza
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil
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12
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Zhang QY, Zhao LP, Tian XX, Yan CH, Li Y, Liu YX, Wang PX, Zhang XJ, Han YL. The novel intracellular protein CREG inhibits hepatic steatosis, obesity, and insulin resistance. Hepatology 2017; 66:834-854. [PMID: 28508477 DOI: 10.1002/hep.29257] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2017] [Revised: 04/02/2017] [Accepted: 05/08/2017] [Indexed: 12/12/2022]
Abstract
UNLABELLED Cellular repressor of E1A-stimulated genes (CREG), a novel cellular glycoprotein, has been identified as a suppressor of various cardiovascular diseases because of its capacity to reduce hyperplasia, maintain vascular homeostasis, and promote endothelial restoration. However, the effects and mechanism of CREG in metabolic disorder and hepatic steatosis remain unknown. Here, we report that hepatocyte-specific CREG deletion dramatically exacerbates high-fat diet and leptin deficiency-induced (ob/ob) adverse effects such as obesity, hepatic steatosis, and metabolic disorders, whereas a beneficial effect is conferred by CREG overexpression. Additional experiments demonstrated that c-Jun N-terminal kinase 1 (JNK1) but not JNK2 is largely responsible for the protective effect of CREG on the aforementioned pathologies. Notably, JNK1 inhibition strongly prevents the adverse effects of CREG deletion on steatosis and related metabolic disorders. Mechanistically, CREG interacts directly with apoptosis signal-regulating kinase 1 (ASK1) and inhibits its phosphorylation, thereby blocking the downstream MKK4/7-JNK1 signaling pathway and leading to significantly alleviated obesity, insulin resistance, and hepatic steatosis. Importantly, dramatically reduced CREG expression and hyperactivated JNK1 signaling was observed in the livers of nonalcoholic fatty liver disease (NAFLD) patients, suggesting that CREG might be a promising therapeutic target for NAFLD and related metabolic diseases. CONCLUSION The results of our study provides evidence that CREG is a robust suppressor of hepatic steatosis and metabolic disorders through its direct interaction with ASK1 and the resultant inactivation of ASK1-JNK1 signaling. This study offers insights into NAFLD pathogenesis and its complicated pathologies, such as obesity and insulin resistance, and paves the way for disease treatment through targeting CREG. (Hepatology 2017;66:834-854).
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Affiliation(s)
- Quan-Yu Zhang
- Graduate School of Third Military Medical University, Chongqing, China.,Department of Cardiology, General Hospital of Shenyang Military Region, Shenyang, China
| | - Ling-Ping Zhao
- Institute of Model Animals of Wuhan University, Wuhan, China
| | - Xiao-Xiang Tian
- Department of Cardiology, General Hospital of Shenyang Military Region, Shenyang, China
| | - Cheng-Hui Yan
- Department of Cardiology, General Hospital of Shenyang Military Region, Shenyang, China
| | - Yang Li
- Department of Cardiology, General Hospital of Shenyang Military Region, Shenyang, China
| | - Yan-Xia Liu
- Department of Cardiology, General Hospital of Shenyang Military Region, Shenyang, China
| | - Pi-Xiao Wang
- Institute of Model Animals of Wuhan University, Wuhan, China
| | - Xiao-Jing Zhang
- Institute of Model Animals of Wuhan University, Wuhan, China
| | - Ya-Ling Han
- Department of Cardiology, General Hospital of Shenyang Military Region, Shenyang, China
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Hu X, Binns D, Reese ML. The coccidian parasites Toxoplasma and Neospora dysregulate mammalian lipid droplet biogenesis. J Biol Chem 2017; 292:11009-11020. [PMID: 28487365 DOI: 10.1074/jbc.m116.768176] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 05/05/2017] [Indexed: 11/06/2022] Open
Abstract
Upon infection, the intracellular parasite Toxoplasma gondii co-opts critical functions of its host cell to avoid immune clearance and gain access to nutritional resources. One route by which Toxoplasma co-opts its host cell is through hijacking host organelles, many of which have roles in immunomodulation. Here we demonstrate that Toxoplasma infection results in increased biogenesis of host lipid droplets through rewiring of multiple components of host neutral lipid metabolism. These metabolic changes cause increased responsiveness of host cells to free fatty acid, leading to a radical increase in the esterification of free fatty acids into triacylglycerol. We identified c-Jun kinase and mammalian target of rapamycin (mTOR) as components of two distinct host signaling pathways that modulate the parasite-induced lipid droplet accumulation. We also found that, unlike many host processes dysregulated during Toxoplasma infection, the induction of lipid droplet generation is conserved not only during infection with genetically diverse Toxoplasma strains but also with Neospora caninum, which is closely related to Toxoplasma but has a restricted host range and uses different effector proteins to alter host signaling. Finally, by showing that a Toxoplasma strain deficient in exporting a specific class of effectors is unable to induce lipid droplet accumulation, we demonstrate that the parasite plays an active role in this process. These results indicate that, despite their different host ranges, Toxoplasma and Neospora use a conserved mechanism to co-opt these host organelles, which suggests that lipid droplets play a critical role at the coccidian host-pathogen interface.
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Affiliation(s)
- Xiaoyu Hu
- From the Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9041
| | - Derk Binns
- From the Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9041
| | - Michael L Reese
- From the Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9041
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Hanski L, Vuorela P. Lead Discovery Strategies for Identification of Chlamydia pneumoniae Inhibitors. Microorganisms 2016; 4:E43. [PMID: 27916800 PMCID: PMC5192526 DOI: 10.3390/microorganisms4040043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 10/28/2016] [Accepted: 11/04/2016] [Indexed: 12/18/2022] Open
Abstract
Throughout its known history, the gram-negative bacterium Chlamydia pneumoniae has remained a challenging target for antibacterial chemotherapy and drug discovery. Owing to its well-known propensity for persistence and recent reports on antimicrobial resistence within closely related species, new approaches for targeting this ubiquitous human pathogen are urgently needed. In this review, we describe the strategies that have been successfully applied for the identification of nonconventional antichlamydial agents, including target-based and ligand-based virtual screening, ethnopharmacological approach and pharmacophore-based design of antimicrobial peptide-mimicking compounds. Among the antichlamydial agents identified via these strategies, most translational work has been carried out with plant phenolics. Thus, currently available data on their properties as antichlamydial agents are described, highlighting their potential mechanisms of action. In this context, the role of mitogen-activated protein kinase activation in the intracellular growth and survival of C. pneumoniae is discussed. Owing to the complex and often complementary pathways applied by C. pneumoniae in the different stages of its life cycle, multitargeted therapy approaches are expected to provide better tools for antichlamydial therapy than agents with a single molecular target.
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Affiliation(s)
- Leena Hanski
- Pharmaceutical Biology, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, Helsinki FI-00014, Finland.
| | - Pia Vuorela
- Pharmaceutical Biology, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, Helsinki FI-00014, Finland.
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Cheng F, Twardowski L, Fehr S, Aner C, Schaeffeler E, Joos T, Knorpp T, Dorweiler B, Laufer S, Schwab M, Torzewski M. Selective p38α MAP kinase/MAPK14 inhibition in enzymatically modified LDL‐stimulated human monocytes: implications for atherosclerosis. FASEB J 2016; 31:674-686. [DOI: 10.1096/fj.201600669r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 10/24/2016] [Indexed: 01/13/2023]
Affiliation(s)
- Fei Cheng
- Department of Laboratory MedicineRobert‐Bosch‐HospitalStuttgartGermany
- Dr. Margarete Fischer‐Bosch Institute of Clinical PharmacologyUniversity of TübingenStuttgartGermany
| | - Laura Twardowski
- Department of Laboratory MedicineRobert‐Bosch‐HospitalStuttgartGermany
| | - Sarah Fehr
- Dr. Margarete Fischer‐Bosch Institute of Clinical PharmacologyUniversity of TübingenStuttgartGermany
| | - Christoph Aner
- Dr. Margarete Fischer‐Bosch Institute of Clinical PharmacologyUniversity of TübingenStuttgartGermany
| | - Elke Schaeffeler
- Dr. Margarete Fischer‐Bosch Institute of Clinical PharmacologyUniversity of TübingenStuttgartGermany
| | - Thomas Joos
- Natural and Medical Sciences InstituteUniversity of TübingenReutlingenGermany
| | - Thomas Knorpp
- Natural and Medical Sciences InstituteUniversity of TübingenReutlingenGermany
| | - Bernhard Dorweiler
- Division of Vascular Surgery, Department of Cardiothoracic and Vascular SurgeryUniversity Medical Center, Johannes‐Gutenberg UniversityMainzGermany
| | - Stefan Laufer
- Institute of PharmacyUniversity of TübingenTübingenGermany
| | - Matthias Schwab
- Dr. Margarete Fischer‐Bosch Institute of Clinical PharmacologyUniversity of TübingenStuttgartGermany
- Institute of PharmacyUniversity of TübingenTübingenGermany
- Department of Clinical PharmacologyUniversity Hospital TübingenTübingenGermany
| | - Michael Torzewski
- Department of Laboratory MedicineRobert‐Bosch‐HospitalStuttgartGermany
- Dr. Margarete Fischer‐Bosch Institute of Clinical PharmacologyUniversity of TübingenStuttgartGermany
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16
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Filardo S, Di Pietro M, Schiavoni G, Minniti G, Ortolani E, Romano S, Sessa R. Chlamydia pneumoniae Clinical Isolate from Gingival Crevicular Fluid: A Potential Atherogenic Strain. Front Cell Infect Microbiol 2015; 5:86. [PMID: 26636048 PMCID: PMC4659442 DOI: 10.3389/fcimb.2015.00086] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Accepted: 11/13/2015] [Indexed: 12/17/2022] Open
Abstract
Chlamydia pneumoniae has been associated to atherosclerotic cardiovascular diseases. The aim of our study was to characterize, for the first time, a C. pneumoniae strain isolated from the gingival crevicular fluid of a patient with chronic periodontitis, described as a risk factor for cardiovascular diseases. C. pneumoniae isolate was characterized and compared to the respiratory AR-39 strain by VD4-ompA genotyping and by investigating the intracellular growth in epithelial and macrophage cell lines and its ability to induce macrophage-derived foam cells. Inflammatory cytokine levels were determined in the gingival crevicular fluid sample. C. pneumoniae isolate showed a 99% similarity with the AR-39 strain in the VD4-ompA gene sequence and shared a comparable growth kinetic in epithelial cells and macrophages, as evidenced by the infectious progeny and by the number of chlamydial genomic copies. C. pneumoniae isolate significantly increased the number of foam cells as compared to uninfected and LDL-treated macrophages (45 vs. 6%, P = 0.0065) and to the AR-39 strain (45 vs. 30%, P = 0.0065). Significantly increased levels of interleukin 1-β (2.1 ± 0.3 pg/μL) and interleukin 6 (0.6 ± 0.08 pg/μL) were found. Our results suggest that C. pneumoniae may harbor inside oral cavity and potentially be atherogenic, even though further studies will be needed to clarify the involvement of C. pneumoniae in chronic periodontitis as a risk factor for cardiovascular diseases.
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Affiliation(s)
- Simone Filardo
- Department of Public Health and Infectious Diseases, "Sapienza" University Rome, Italy
| | - Marisa Di Pietro
- Department of Public Health and Infectious Diseases, "Sapienza" University Rome, Italy
| | - Giovanna Schiavoni
- Department of Public Health and Infectious Diseases, "Sapienza" University Rome, Italy
| | - Gianluca Minniti
- General Dentistry and Emergency Care Unit, George Eastman Dental Hospital Rome, Italy
| | - Emanuela Ortolani
- General Dentistry and Emergency Care Unit, George Eastman Dental Hospital Rome, Italy
| | - Silvio Romano
- Department of Life, Health & Environmental Sciences, University of L'Aquila L'Aquila, Italy
| | - Rosa Sessa
- Department of Public Health and Infectious Diseases, "Sapienza" University Rome, Italy
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Yu X, Guan PP, Guo JW, Wang Y, Cao LL, Xu GB, Konstantopoulos K, Wang ZY, Wang P. By suppressing the expression of anterior pharynx-defective-1α and -1β and inhibiting the aggregation of β-amyloid protein, magnesium ions inhibit the cognitive decline of amyloid precursor protein/presenilin 1 transgenic mice. FASEB J 2015; 29:5044-58. [PMID: 26293690 DOI: 10.1096/fj.15-275578] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 08/13/2015] [Indexed: 01/19/2023]
Abstract
Alzheimer's disease (AD) is associated with a magnesium ion (Mg(2+)) deficit in the serum or brain. However, the mechanisms regulating the roles of Mg(2+) in the pathologic condition of AD remain unknown. We studied whether brain Mg(2+) can decrease β-amyloid (Aβ) deposition and ameliorate the cognitive decline in a model of AD, the APPswe/PS1DE9 transgenic (Tg) mouse. We used a recently developed compound, magnesium-L-threonate (MgT), for a treatment that resulted in enhanced clearance of Aβ in an anterior pharynx-defective (APH)-1α/-1β-dependent manner. To further explore how MgT treatment inhibits cognitive decline in APP/PS1 Tg mice, the critical molecules for amyloid precursor protein (APP) cleavage and signaling pathways were investigated. In neurons, ERK1/2 and PPARγ signaling pathways were activated by MgT treatment, which in turn suppressed (by >80%) the expression of APH-1α/-1β, which is responsible for the deposition of Aβ and potentially contributes to the memory deficit that occurs in AD. More important, Aβ oligomers in the cerebrospinal fluid (CSF) further promoted the expression of APH-1α/-1β (by >2.5-fold), which enhances the γ-cleavage of APP and Aβ deposition during AD progression. These findings provide new insights into the mechanisms of AD progression and are instrumental for developing better strategies to combat the disease.
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Affiliation(s)
- Xin Yu
- *College of Life and Health Sciences, Northeastern University, Shenyang, China; and Department of Chemical and Biomolecular Engineering, Department of Biomedical Engineering, Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins Physical Sciences-Oncology Center, and Center of Cancer Nanotechnology Excellence, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Pei-Pei Guan
- *College of Life and Health Sciences, Northeastern University, Shenyang, China; and Department of Chemical and Biomolecular Engineering, Department of Biomedical Engineering, Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins Physical Sciences-Oncology Center, and Center of Cancer Nanotechnology Excellence, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Jing-Wen Guo
- *College of Life and Health Sciences, Northeastern University, Shenyang, China; and Department of Chemical and Biomolecular Engineering, Department of Biomedical Engineering, Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins Physical Sciences-Oncology Center, and Center of Cancer Nanotechnology Excellence, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Yue Wang
- *College of Life and Health Sciences, Northeastern University, Shenyang, China; and Department of Chemical and Biomolecular Engineering, Department of Biomedical Engineering, Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins Physical Sciences-Oncology Center, and Center of Cancer Nanotechnology Excellence, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Long-Long Cao
- *College of Life and Health Sciences, Northeastern University, Shenyang, China; and Department of Chemical and Biomolecular Engineering, Department of Biomedical Engineering, Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins Physical Sciences-Oncology Center, and Center of Cancer Nanotechnology Excellence, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Guo-Biao Xu
- *College of Life and Health Sciences, Northeastern University, Shenyang, China; and Department of Chemical and Biomolecular Engineering, Department of Biomedical Engineering, Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins Physical Sciences-Oncology Center, and Center of Cancer Nanotechnology Excellence, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Konstantinos Konstantopoulos
- *College of Life and Health Sciences, Northeastern University, Shenyang, China; and Department of Chemical and Biomolecular Engineering, Department of Biomedical Engineering, Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins Physical Sciences-Oncology Center, and Center of Cancer Nanotechnology Excellence, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Zhan-You Wang
- *College of Life and Health Sciences, Northeastern University, Shenyang, China; and Department of Chemical and Biomolecular Engineering, Department of Biomedical Engineering, Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins Physical Sciences-Oncology Center, and Center of Cancer Nanotechnology Excellence, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Pu Wang
- *College of Life and Health Sciences, Northeastern University, Shenyang, China; and Department of Chemical and Biomolecular Engineering, Department of Biomedical Engineering, Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins Physical Sciences-Oncology Center, and Center of Cancer Nanotechnology Excellence, The Johns Hopkins University, Baltimore, Maryland, USA
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YANG HUIYU, BIAN YUNFEI, ZHANG HUAPING, GAO FEN, XIAO CHUANSHI, LIANG BIN, LI JIN, ZHANG NANA, YANG ZHIMING. LOX-1 is implicated in oxidized low-density lipoprotein-induced oxidative stress of macrophages in atherosclerosis. Mol Med Rep 2015; 12:5335-41. [DOI: 10.3892/mmr.2015.4066] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 06/23/2015] [Indexed: 11/06/2022] Open
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