1
|
Das K, Paul S, Ghosh A, Gupta S, Mukherjee T, Shankar P, Sharma A, Keshava S, Chauhan SC, Kashyap VK, Parashar D. Extracellular Vesicles in Triple-Negative Breast Cancer: Immune Regulation, Biomarkers, and Immunotherapeutic Potential. Cancers (Basel) 2023; 15:4879. [PMID: 37835573 PMCID: PMC10571545 DOI: 10.3390/cancers15194879] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 09/25/2023] [Accepted: 09/28/2023] [Indexed: 10/15/2023] Open
Abstract
Triple-negative breast cancer (TNBC) is an aggressive subtype accounting for ~10-20% of all human BC and is characterized by the absence of estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor 2 (HER2) amplification. Owing to its unique molecular profile and limited targeted therapies, TNBC treatment poses significant challenges. Unlike other BC subtypes, TNBC lacks specific molecular targets, rendering endocrine therapies and HER2-targeted treatments ineffective. The chemotherapeutic regimen is the predominant systemic treatment modality for TNBC in current clinical practice. However, the efficacy of chemotherapy in TNBC is variable, with response rates varying between a wide range of patients, and the emerging resistance further adds to the difficulties. Furthermore, TNBC exhibits a higher mutational burden and is acknowledged as the most immunogenic of all BC subtypes. Consequently, the application of immune checkpoint inhibition has been investigated in TNBC, yielding promising outcomes. Recent evidence identified extracellular vesicles (EVs) as an important contributor in the context of TNBC immunotherapy. In view of the extraordinary ability of EVs to transfer bioactive molecules, such as proteins, lipids, DNA, mRNAs, and small miRNAs, between the cells, EVs are considered a promising diagnostic biomarker and novel drug delivery system among the prospects for immunotherapy. The present review provides an in-depth understanding of how EVs influence TNBC progression, its immune regulation, and their contribution as a predictive biomarker for TNBC. The final part of the review focuses on the recent key advances in immunotherapeutic strategies for better understanding the complex interplay between EVs and the immune system in TNBC and further developing EV-based targeted immunotherapies.
Collapse
Affiliation(s)
- Kaushik Das
- Department of Cellular and Molecular Biology, The University of Texas at Tyler Health Science Center, Tyler, TX 75708, USA;
| | - Subhojit Paul
- School of Biological Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700012, India; (S.P.); (A.G.)
| | - Arnab Ghosh
- School of Biological Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700012, India; (S.P.); (A.G.)
| | - Saurabh Gupta
- Department of Biotechnology, GLA University, Mathura 281406, India;
| | - Tanmoy Mukherjee
- School of Medicine, The University of Texas at Tyler Health Science Center, Tyler, TX 75708, USA;
| | - Prem Shankar
- Department of Neurobiology, The University of Texas Medical Branch, Galveston, TX 77555, USA or
| | - Anshul Sharma
- Division of Hematology & Oncology, Department of Medicine, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Shiva Keshava
- Department of Cellular and Molecular Biology, The University of Texas at Tyler Health Science Center, Tyler, TX 75708, USA;
| | - Subhash C. Chauhan
- Department of Immunology and Microbiology, School of Medicine, University of Texas Rio Grande Valley, McAllen, TX 78504, USA; (S.C.C.); (V.K.K.)
- South Texas Center of Excellence in Cancer Research, School of Medicine, University of Texas Rio Grande Valley, McAllen, TX 78504, USA
| | - Vivek Kumar Kashyap
- Department of Immunology and Microbiology, School of Medicine, University of Texas Rio Grande Valley, McAllen, TX 78504, USA; (S.C.C.); (V.K.K.)
- South Texas Center of Excellence in Cancer Research, School of Medicine, University of Texas Rio Grande Valley, McAllen, TX 78504, USA
| | - Deepak Parashar
- Division of Hematology & Oncology, Department of Medicine, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| |
Collapse
|
2
|
Grossini E, Smirne C, Venkatesan S, Tonello S, D'Onghia D, Minisini R, Cantaluppi V, Sainaghi PP, Comi C, Tanzi A, Bussolati B, Pirisi M. Plasma Pattern of Extracellular Vesicles Isolated from Hepatitis C Virus Patients and Their Effects on Human Vascular Endothelial Cells. Int J Mol Sci 2023; 24:10197. [PMID: 37373343 DOI: 10.3390/ijms241210197] [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: 04/28/2023] [Revised: 06/08/2023] [Accepted: 06/13/2023] [Indexed: 06/29/2023] Open
Abstract
Hepatitis C virus (HCV) patients are at increased risk of cardiovascular disease (CVD). In this study, we aimed to evaluate the role of extracellular vesicles (EVs) as pathogenic factors for the onset of HCV-related endothelial dysfunction. Sixty-five patients with various stages of HCV-related chronic liver disease were enrolled in this case series. Plasma EVs were characterized and used to stimulate human vascular endothelial cells (HUVEC), which were examined for cell viability, mitochondrial membrane potential, and reactive oxygen species (ROS) release. The results showed that EVs from HCV patients were mainly of endothelial and lymphocyte origin. Moreover, EVs were able to reduce cell viability and mitochondrial membrane potential of HUVEC, while increasing ROS release. Those harmful effects were reduced by the pretreatment of HUVEC with the NLR family pyrin domain containing 3 (NLRP3)/AMP-activated protein kinase and protein kinase B blockers. In conclusion, in HCV patients, we could highlight a circulating pattern of EVs capable of inducing damage to the endothelium. These data represent a novel possible pathogenic mechanism underlying the reported increase of CVD occurrence in HCV infection and could be of clinical relevance also in relation to the widespread use of antiviral drugs.
Collapse
Affiliation(s)
- Elena Grossini
- Laboratory of Physiology, Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy
| | - Carlo Smirne
- Internal Medicine Unit, Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy
- Maggiore della Carità Hospital, 28100 Novara, Italy
| | - Sakthipriyan Venkatesan
- Laboratory of Physiology, Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy
| | - Stelvio Tonello
- Internal Medicine Unit, Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy
- Maggiore della Carità Hospital, 28100 Novara, Italy
| | - Davide D'Onghia
- Internal Medicine Unit, Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy
- Maggiore della Carità Hospital, 28100 Novara, Italy
| | - Rosalba Minisini
- Internal Medicine Unit, Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy
- Maggiore della Carità Hospital, 28100 Novara, Italy
| | - Vincenzo Cantaluppi
- Nephrology Unit, Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy
| | - Pier Paolo Sainaghi
- Internal Medicine Unit, Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy
- CAAD-Center for Autoimmune and Allergic Diseases, and IRCAD-Interdisciplinary Research Center for Autoimmune Diseases, Università del Piemonte Orientale, 28100 Novara, Italy
| | - Cristoforo Comi
- Neurology Unit, Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy
- Sant'Andrea Hospital, 13100 Vercelli, Italy
| | - Adele Tanzi
- Molecular Biotechnology Center "Guido Tarone", Department of Molecular Biotechnology and Health Sciences, University of Torino, 10124 Turin, Italy
| | - Benedetta Bussolati
- Molecular Biotechnology Center "Guido Tarone", Department of Molecular Biotechnology and Health Sciences, University of Torino, 10124 Turin, Italy
| | - Mario Pirisi
- Internal Medicine Unit, Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy
- Maggiore della Carità Hospital, 28100 Novara, Italy
| |
Collapse
|
3
|
Mas-Bargues C, Alique M. Extracellular Vesicles as "Very Important Particles" (VIPs) in Aging. Int J Mol Sci 2023; 24:ijms24044250. [PMID: 36835661 PMCID: PMC9964932 DOI: 10.3390/ijms24044250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/15/2023] [Accepted: 02/18/2023] [Indexed: 02/25/2023] Open
Abstract
In recent decades, extracellular vesicles have been recognized as "very important particles" (VIPs) associated with aging and age-related disease. During the 1980s, researchers discovered that these vesicle particles released by cells were not debris but signaling molecules carrying cargoes that play key roles in physiological processes and physiopathological modulation. Following the International Society for Extracellular Vesicles (ISEV) recommendation, different vesicle particles (e.g., exosomes, microvesicles, oncosomes) have been named globally extracellular vesicles. These vesicles are essential to maintain body homeostasis owing to their essential and evolutionarily conserved role in cellular communication and interaction with different tissues. Furthermore, recent studies have shown the role of extracellular vesicles in aging and age-associated diseases. This review summarizes the advances in the study of extracellular vesicles, mainly focusing on recently refined methods for their isolation and characterization. In addition, the role of extracellular vesicles in cell signaling and maintenance of homeostasis, as well as their usefulness as new biomarkers and therapeutic agents in aging and age-associated diseases, has also been highlighted.
Collapse
Affiliation(s)
- Cristina Mas-Bargues
- Grupo de Investigación Freshage, Departamento de Fisiología, Facultad de Medicina, Universidad de Valencia, Centro de Investigación Biomédica en Red Fragilidad y Envejecimiento Saludable-Instituto de Salud Carlos III (CIBERFES-ISCIII), Instituto Sanitario de Investigación INCLIVA, 46010 Valencia, Spain
- Correspondence: (C.M.-B.); (M.A.)
| | - Matilde Alique
- Departamento de Biología de Sistemas, Universidad de Alcalá, Alcalá de Henares, 28871 Madrid, Spain
- Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), 28034 Madrid, Spain
- Correspondence: (C.M.-B.); (M.A.)
| |
Collapse
|
4
|
Moreno CR, Ramires JAF, Lotufo PA, Soeiro AM, Oliveira LMDS, Ikegami RN, Kawakami JT, Pereira JDJ, Reis MM, Higuchi MDL. Morphomolecular Characterization of Serum Nanovesicles From Microbiomes Differentiates Stable and Infarcted Atherosclerotic Patients. Front Cardiovasc Med 2021; 8:694851. [PMID: 34422924 PMCID: PMC8375156 DOI: 10.3389/fcvm.2021.694851] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 07/08/2021] [Indexed: 12/19/2022] Open
Abstract
Microbial communities are considered decisive for maintaining a healthy situation or for determining diseases. Acute myocardial infarction (AMI) is an important complication of atherosclerosis caused by the rupture of atheroma plaques containing proinflammatory cytokines, reactive oxygen species, oxidized low-density lipoproteins (oxLDL), damaged proteins, lipids, and DNA, a microenvironment compatible with a pathogenic microbial community. Previously, we found that archaeal DNA-positive infectious microvesicles (iMVs) were detected in vulnerable plaques and in the sera of Chagas disease patients with heart failure. Now, we characterize and quantify the levels of serum microbiome extracellular vesicles through their size and content using morphomolecular techniques to differentiate clinical outcomes in coronary artery disease (CAD). We detected increased numbers of large iMVs (0.8–1.34 nm) with highly negative surface charge that were positive for archaeal DNA, Mycoplasma pneumoniae antigens and MMP9 in the sera of severe AMI patients, strongly favoring our hypothesis that pathogenic archaea may play a role in the worst outcomes of atherosclerosis. The highest numbers of EVs <100 nm (exosomes) and MVs from 100 to 200 nm in the stable atherosclerotic and control healthy groups compared with the AMI groups were indicative that these EVs are protective, entrapping and degrading infectious antigens and active MMP9 and protect against the development of plaque rupture. Conclusion: A microbiome with pathogenic archaea is associated with high numbers of serum iMVs in AMI with the worst prognosis. This pioneering work demonstrates that the morphomolecular characterization and quantification of iEVs in serum may constitute a promising serum prognostic biomarker in CAD.
Collapse
Affiliation(s)
- Camila Rodrigues Moreno
- Laboratorio de Patologia Cardiaca, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - José Antonio Franchini Ramires
- Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | | | - Alexandre Matos Soeiro
- Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Luanda Mara da Silva Oliveira
- Laboratório de Investigação em Dermatologia e Imunodeficiências - LIM56, Departamento de Dermatologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Renata Nishiyama Ikegami
- Laboratorio de Patologia Cardiaca, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Joyce Tiyeko Kawakami
- Laboratorio de Patologia Cardiaca, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Jaqueline de Jesus Pereira
- Laboratorio de Patologia Cardiaca, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Marcia Martins Reis
- Laboratorio de Patologia Cardiaca, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Maria de Lourdes Higuchi
- Laboratorio de Patologia Cardiaca, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| |
Collapse
|
5
|
Jayachandran M, Lahr BD, Bailey KR, Miller VM, Kantarci K. Menopausal hormone therapy, blood thrombogenicity, and development of white matter hyperintensities in women of the Kronos Early Estrogen Prevention Study. ACTA ACUST UNITED AC 2021; 27:305-310. [PMID: 31934946 PMCID: PMC7050795 DOI: 10.1097/gme.0000000000001465] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Supplemental Digital Content is available in the text Objective: Development of white matter hyperintensities (WMH) in the brain is associated with blood thrombogenicity in recently menopausal women. This study examined the influence of menopausal hormone treatments (MHTs) on this association. Methods: Measures of blood thrombogenicity were examined in women of the Kronos Early Estrogen Prevention Study (n = 95) who had brain magnetic resonance imaging before and during the 48 months of randomization to transdermal 17β-estradiol (n = 30), oral conjugated equine estrogen (n = 29) both with progesterone for 12 days per month or placebo pills and patch (n = 36). Principal components (PCs) analysis was used to reduce the dimensionality of 14 markers of platelet activation and blood thrombogenicity. The first 5 PCs were assessed for association with treatment and changes in WMH. Within-person slopes were obtained to capture the extent of WMH change for each woman. Results: WMH increased in all groups over the 48 months (P = 0.044). The partial effect of PC1, representing an average of six thrombogenicity variables (microvesicles derived from endothelium, leukocytes, and monocytes, and positive for tissue factor and adhesion molecules) on WMH was significant (P = 0.003). PC3, reflecting a contrast of platelet microaggregates and adenosine triphosphate secretion versus total platelet count, differed across groups (P = 0.006) with higher scores in the oral conjugated equine estrogen group. The global association between PCs and WMH increase, however, did not differ significantly by MHT (P = 0.207 for interaction between MHT and PC's). Conclusion: In recently menopausal women, the type of MHT did not significantly influence the association of markers of blood thrombogenicity with development of WMH in the brain.
Collapse
Affiliation(s)
- Muthuvel Jayachandran
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN.,Department of Surgery, Mayo Clinic, Rochester, MN
| | - Brian D Lahr
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN
| | - Kent R Bailey
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN
| | - Virginia M Miller
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN.,Department of Surgery, Mayo Clinic, Rochester, MN
| | | |
Collapse
|
6
|
Abstract
PURPOSE OF REVIEW This review summarizes the effects of microparticles and exosomes in the progression of atherosclerosis and the prospect for their diagnostic and therapeutic potentials. RECENT FINDINGS Microparticles and exosomes can induce endothelial dysfunction, vascular inflammation, coagulation, thrombosis, and calcification via their components of proteins and noncoding RNAs, which may promote the progression of atherosclerosis. The applications of microparticles and exosomes become the spotlight of clinical diagnosis and therapy. Microparticles and exosomes are members of extracellular vesicles, which are generated in various cell types by different mechanisms of cell membrane budding and multivesicular body secretion, respectively. They are important physiologic pathways of cell-to-cell communication in vivo and act as messengers accelerating or alleviating the process of atherosclerosis. Microparticles and exosomes may become diagnostic biomarkers and therapeutic approaches of atherosclerosis.
Collapse
|
7
|
Higuchi MDL, Kawakami JT, Ikegami RN, Reis MM, Pereira JDJ, Ianni BM, Buck P, Oliveira LMDS, Santos MHH, Hajjar LA, Bocchi EA. Archaea Symbiont of T. cruzi Infection May Explain Heart Failure in Chagas Disease. Front Cell Infect Microbiol 2018; 8:412. [PMID: 30519544 PMCID: PMC6259288 DOI: 10.3389/fcimb.2018.00412] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 11/06/2018] [Indexed: 12/20/2022] Open
Abstract
Background: Archaeal genes present in Trypanosoma cruzi may represent symbionts that would explain development of heart failure in 30% of Chagas disease patients. Extracellular vesicles in peripheral blood, called exosomes (< 0.1 μm) or microvesicles (>0.1 μm), present in larger numbers in heart failure, were analyzed to determine whether they are derived from archaea in heart failure Chagas disease. Methods: Exosomes and microvesicles in serum supernatant from 3 groups were analyzed: heart failure Chagas disease (N = 26), asymptomatic indeterminate form (N = 21) and healthy non-chagasic control (N = 16). Samples were quantified with transmission electron microscopy, flow cytometer immunolabeled with anti-archaemetzincin-1 antibody (AMZ 1, archaea collagenase) and probe anti-archaeal DNA and zymography to determine AMZ1 (Archaeal metalloproteinase) activity. Results: Indeterminate form patients had higher median numbers of exosomes/case vs. heart failure patients (58.5 vs. 25.5, P < 0.001), higher exosome content of AMZ1 antigens (2.0 vs. 0.0; P < 0.001), and lower archaeal DNA content (0.2 vs. 1.5, P = 0.02). A positive correlation between exosomes and AMZ1 content was seen in indeterminate form (r = 0.5, P < 0.001), but not in heart failure patients (r = 0.002, P = 0.98). Higher free archaeal DNA (63.0 vs. 11.1, P < 0.001) in correlation with exosome numbers (r = 0.66, P = 0.01) was seen in heart failure but not in indeterminate form (r = 0.29, P = 0.10). Flow cytometer showed higher numbers of AMZ1 microvesicles in indeterminate form (64 vs. 36, P = 0.02) and higher archaeal DNA microvesicles in heart failure (8.1 vs. 0.9, P < 0.001). Zymography showed strong% collagenase activity in HF group, mild activity in IF compared to non-chagasic healthy group (121 ± 14, 106 ± 13 and 100; P < 0.001). Conclusions: Numerous exosomes, possibly removing and degrading abnormal AMZ1 collagenase, are associated with indeterminate form. Archaeal microvesicles and their exosomes, possibly associated with release of archaeal AMZ1 in heart failure, are future candidates of heart failure biomarkers if confirmed in larger series, and the therapeutic focus in the treatment of Chagas disease.
Collapse
Affiliation(s)
- Maria de Lourdes Higuchi
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Joyce T Kawakami
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Renata N Ikegami
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Marcia M Reis
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Jaqueline de Jesus Pereira
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Barbara M Ianni
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Paula Buck
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Luanda Mara da Silva Oliveira
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Marilia H H Santos
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Ludhmila A Hajjar
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Edimar A Bocchi
- Instituto do Coraçao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| |
Collapse
|
8
|
Simon C, Greening DW, Bolumar D, Balaguer N, Salamonsen LA, Vilella F. Extracellular Vesicles in Human Reproduction in Health and Disease. Endocr Rev 2018; 39:292-332. [PMID: 29390102 DOI: 10.1210/er.2017-00229] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 01/25/2018] [Indexed: 02/07/2023]
Abstract
Extensive evidence suggests that the release of membrane-enclosed compartments, more commonly known as extracellular vesicles (EVs), is a potent newly identified mechanism of cell-to-cell communication both in normal physiology and in pathological conditions. This review presents evidence about the formation and release of different EVs, their definitive markers and cargo content in reproductive physiological processes, and their capacity to convey information between cells through the transfer of functional protein and genetic information to alter phenotype and function of recipient cells associated with reproductive biology. In the male reproductive tract, epididymosomes and prostasomes participate in regulating sperm motility activation, capacitation, and acrosome reaction. In the female reproductive tract, follicular fluid, oviduct/tube, and uterine cavity EVs are considered as vehicles to carry information during oocyte maturation, fertilization, and embryo-maternal crosstalk. EVs via their cargo might be also involved in the triggering, maintenance, and progression of reproductive- and obstetric-related pathologies such as endometriosis, polycystic ovarian syndrome, preeclampsia, gestational diabetes, and erectile dysfunction. In this review, we provide current knowledge on the present and future use of EVs not only as biomarkers, but also as therapeutic targeting agents, mainly as vectors for drug or compound delivery into target cells and tissues.
Collapse
Affiliation(s)
- Carlos Simon
- Igenomix Foundation, Valencia, Spain.,Instituto de Investigación Sanitaria Hospital Clínico (INCLIVA), Valencia, Spain.,Department of Pediatrics, Obstetrics and Gynecology, School of Medicine, Valencia University, Valencia, Spain.,Department of Obstetrics and Gynecology, Stanford University, Palo Alto, California
| | - David W Greening
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - David Bolumar
- Igenomix Foundation, Valencia, Spain.,Instituto de Investigación Sanitaria Hospital Clínico (INCLIVA), Valencia, Spain
| | - Nuria Balaguer
- Igenomix Foundation, Valencia, Spain.,Instituto de Investigación Sanitaria Hospital Clínico (INCLIVA), Valencia, Spain
| | - Lois A Salamonsen
- Centre for Reproductive Health, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Department of Molecular and Translational Science, Monash University, Clayton, Victoria, Australia.,Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Felipe Vilella
- Igenomix Foundation, Valencia, Spain.,Instituto de Investigación Sanitaria Hospital Clínico (INCLIVA), Valencia, Spain.,Department of Obstetrics and Gynecology, Stanford University, Palo Alto, California
| |
Collapse
|
9
|
Jayachandran M, Garovic VD, Mielke MM, Bailey KR, Lahr BD, Miller VM. Characterization of intravascular cellular activation in relationship to subclinical atherosclerosis in postmenopausal women. PLoS One 2017; 12:e0183159. [PMID: 28910282 PMCID: PMC5598935 DOI: 10.1371/journal.pone.0183159] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 07/31/2017] [Indexed: 02/02/2023] Open
Abstract
Objective Mechanisms and interactions among intravascular cells contributing to development of subclinical atherosclerosis are poorly understood. In women, both menopausal status and pregnancy history influence progression of atherosclerosis. This study examined activation and interactions among blood elements with subclinical atherosclerosis in menopausal women with known pregnancy histories. Methods Carotid intima-media thickness (CIMT), as a marker of subclinical atherosclerosis, was measured using B-mode ultrasound in age- and parity-matched women [40 with and 40 without a history of preeclampsia] 35 years after the index pregnancy. Interactions among intravascular cells (38 parameters) were measured by flow cytometry in venous blood. Data analysis was by principal component which retained 7 independent dimensions accounting for 63% of the variability among 38 parameters. Results CIMT was significantly greater in women with a history of preeclampsia (P = 0.004). Platelet aggregation and platelet interactions with granulocytes and monocytes positively associated with CIMT in postmenopausal women independent of their pregnancy history (ρ = 0.258, P< 0.05). However, the association of the number of platelets, platelet activation and monocyte-platelet interactions with CIMT differed significantly depending upon pregnancy history (test for interaction, P<0.001). Conclusion Interactions among actived intravascular cells and their association with subclinical atherosclerosis differ in women depending upon their pregnancy histories.
Collapse
Affiliation(s)
- Muthuvel Jayachandran
- Departments of Surgery, Mayo Clinic, Rochester, Minnesota, United States of America
- Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Vesna D. Garovic
- General Internal Medicine, Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Michelle M. Mielke
- Health Science Research, Division of Epidemiology, Mayo Clinic, Rochester, Minnesota, United States of America
- Neurology, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Kent R. Bailey
- Health Science Research, Division of Epidemiology, Mayo Clinic, Rochester, Minnesota, United States of America
- Health Science Research, Division of Biostatistics, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Brian D. Lahr
- Health Science Research, Division of Epidemiology, Mayo Clinic, Rochester, Minnesota, United States of America
- Health Science Research, Division of Biostatistics, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Virginia M. Miller
- Departments of Surgery, Mayo Clinic, Rochester, Minnesota, United States of America
- Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, United States of America
- * E-mail:
| |
Collapse
|
10
|
De Caterina R, D'Ugo E, Libby P. Inflammation and thrombosis - testing the hypothesis with anti-inflammatory drug trials. Thromb Haemost 2016; 116:1012-1021. [PMID: 27535617 DOI: 10.1160/th16-03-0246] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 07/16/2016] [Indexed: 12/17/2022]
Abstract
The hypothesis of atherosclerosis as an inflammatory process has been a leitmotiv in cardiology for the past 20 years, and has now led to the launch of clinical trials aimed at testing whether drugs that primarily target inflammation can reduce cardiovascular events. Inflammation indeed drives all phases of atherosclerosis, from inception, through progression, and ultimately acute thrombotic complications (plaque rupture and probably plaque erosion). Since plaque rupture and erosion cause most acute coronary syndromes, appropriately tuned anti-inflammatory treatments should limit myocardial infarction and cardiovascular death. Beyond interrupting inflammation-related plaque disruption, such treatments might, however, also ameliorate the propensity to thrombosis once the trigger (plaque rupture or erosion) has occurred. Several lines of evidence support this view: experimental data document the role of inflammation in platelet activation, tissue factor-mediated coagulation, hyperfibrinogenaemia, impaired activity of natural anticoagulants (including those expressed by endothelial cells), and reduced fibrinolytic activity. Supporting evidence also derives from the involvement of inflammation in venous thrombosis, a process that commonly occurs in the absence of traditional risk factors for atherosclerosis but is associated with several inflammatory diseases including obesity. Ongoing trials, in addition to evaluating effects on primary outcomes, will afford the opportunity to probe the possibility that anti-inflammatory interventions that yield salutary changes in biomarkers of the thrombotic/fibrinolytic balance also translate into reduction of clinical events.
Collapse
Affiliation(s)
- Raffaele De Caterina
- Raffaele De Caterina, MD, PhD, Institute of Cardiology, "G. d'Annunzio" University - Chieti, C/o Ospedale SS. Annunziata, Via dei Vestini, 66013 Chieti, Italy, Tel.: +39 0871 41512, Fax: +39 0871 402817, E-mail:
| | | | | |
Collapse
|
11
|
Abstract
During apoptosis or activation, cells can release a subcellular structure, called a membrane microvesicle (also known as microparticle) into the extracellular environment. Microvesicles bud-off as a portion of cell membrane with its associated proteins and lipids surrounding a cytosolic core that contains intracellular proteins, lipids, and nucleic acids (DNA, RNA, siRNA, microRNA, lncRNA). Biologically active molecules on the microvesicle surface and encapsulated within can act on recipient cells as a novel mode of intercellular communication. Apoptosis has long been known to be involved in the development of diseases of autoimmunity. Abnormally persistent microvesicles, particularly apoptotic microvesicles, can accelerate autoimmune responses locally in specific organs and tissues as well as systemically. In this review, we focus on studies implicating microvesicles in the pathogenesis of autoimmune diseases and their complications.
Collapse
|
12
|
|
13
|
Wei X, Liu C, Wang H, Wang L, Xiao F, Guo Z, Zhang H. Surface Phosphatidylserine Is Responsible for the Internalization on Microvesicles Derived from Hypoxia-Induced Human Bone Marrow Mesenchymal Stem Cells into Human Endothelial Cells. PLoS One 2016; 11:e0147360. [PMID: 26808539 PMCID: PMC4726621 DOI: 10.1371/journal.pone.0147360] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2015] [Accepted: 01/04/2016] [Indexed: 12/14/2022] Open
Abstract
Background Previous data have proven that microvesicles derived from hypoxia-induced mesenchymal stem cells (MSC-MVs) can be internalized into endothelial cells, enhancing their proliferation and vessel structure formation and promoting in vivo angiogenesis. However, there is a paucity of information about how the MSC-MVs are up-taken by endothelial cells. Methods MVs were prepared from the supernatants of human bone marrow MSCs that had been exposed to a hypoxic and/or serum-deprivation condition. The incorporation of hypoxia-induced MSC-MVs into human umbilical cord endothelial cells (HUVECs) was observed by flow cytometry and confocal microscopy in the presence or absence of recombinant human Annexin-V (Anx-V) and antibodies against human CD29 and CD44. Further, small interfering RNA (siRNA) targeted at Anx-V and PSR was delivered into HUVECs, or HUVECs were treated with a monoclonal antibody against phosphatidylserine receptor (PSR) and the cellular internalization of MVs was re-assessed. Results The addition of exogenous Anx-V could inhibit the uptake of MVs isolated from hypoxia-induced stem cells by HUVECs in a dose- and time-dependent manner, while the anti-CD29 and CD44 antibodies had no effect on the internalization process. The suppression was neither observed in Anx-V siRNA-transfected HUVECs, however, addition of anti-PSR antibody and PSR siRNA-transfected HUVECs greatly blocked the incorporation of MVs isolated from hypoxia-induced stem cells into HUVECs. Conclusion PS on the MVs isolated from hypoxia-induced stem cells is the critical molecule in the uptake by HUVECs.
Collapse
Affiliation(s)
- Xiaojuan Wei
- Department of Cardiology Surgery, General Hospital of Air Force, Beijing, China
| | - Chaozhong Liu
- Department of Cardiology Surgery, General Hospital of Air Force, Beijing, China
| | - Hengxiang Wang
- Department of Hematology, General Hospital of Air Force, Beijing, China
| | - Lisheng Wang
- Department of Experimental Hematology, Beijing Institute of Radiation Medicine, Beijing, China
| | - Fengjun Xiao
- Department of Experimental Hematology, Beijing Institute of Radiation Medicine, Beijing, China
| | - Zikuan Guo
- Department of Experimental Hematology, Beijing Institute of Radiation Medicine, Beijing, China
| | - Hongchao Zhang
- Department of Cardiology Surgery, General Hospital of Air Force, Beijing, China
- * E-mail:
| |
Collapse
|
14
|
Miller VM. Congress on women's health Trudy Bush lecture 2014: new insights into sex Hormones and Cardiovascular disease. J Womens Health (Larchmt) 2015; 23:997-1004. [PMID: 25495365 DOI: 10.1089/jwh.2014.4995] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Many basic, mechanistic studies of how sex steroids alter vascular function proceeded from Dr. Bush's seminal epidemiologic observations that noncontraceptive use of estrogen reduced all-cause and cardiovascular mortality. However, translating findings from these basic science studies into clinical trials and clinical guidelines has been controversial. This commentary reviews the development of sex steroid vascular research, identifies mechanisms by which sex steroids affect vascular function, reviews findings from recent clinical hormone trials, and identifies challenges and the need for continued funding of such investigations.
Collapse
Affiliation(s)
- Virginia M Miller
- Departments of Surgery and Physiology and Biomedical Engineering, Mayo Clinic , Rochester, Minnesota
| |
Collapse
|
15
|
Fuhrmann G, Herrmann IK, Stevens MM. Cell-derived vesicles for drug therapy and diagnostics: opportunities and challenges. NANO TODAY 2015; 10:397-409. [PMID: 28458718 PMCID: PMC5409525 DOI: 10.1016/j.nantod.2015.04.004] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Extracellular vesicles are small lipid-based membrane-bound entities shed by cells under both physiological and pathological conditions. Their discovery as intercellular communicators through transfer of nucleic acid- and protein-based cargos between cells locally and at distance in a highly specific manner has created recent excitement. The information they transport and their composition may vary depending on the cell of origin as well as the eliciting stimulus. Such sensitive changes in vesicle characteristics hold significant promise for the improved diagnosis of pathological conditions, including infections and neoplastic lesions in a minimally invasive way. Similarly, these cell-derived vesicles exhibit promising characteristics that could enhance drug targeting efficiencies. Recent developments in the field have aimed at studying EVs as novel drug carriers due to their natural composition, biological function and selective cell interaction. In this review, we discuss new research avenues in diagnostics and drug therapy based on extracellular vesicles. We show how cell-derived vesicles can be harvested and engineered to meet application-specific design requirements. We finally discuss potential risks encountered when translating extracellular vesicle based approaches into (pre)clinical applications.
Collapse
Affiliation(s)
- Gregor Fuhrmann
- Department of Materials, Department of Bioengineering, and Institute of Biomedical Engineering, Imperial College London, Prince Consort Road, SW7 2AZ London, United Kingdom
| | - Inge K. Herrmann
- Department of Materials, Department of Bioengineering, and Institute of Biomedical Engineering, Imperial College London, Prince Consort Road, SW7 2AZ London, United Kingdom
| | - Molly M. Stevens
- Department of Materials, Department of Bioengineering, and Institute of Biomedical Engineering, Imperial College London, Prince Consort Road, SW7 2AZ London, United Kingdom
| |
Collapse
|
16
|
Sakhon OS, Ross B, Gusti V, Pham AJ, Vu K, Lo DD. M cell-derived vesicles suggest a unique pathway for trans-epithelial antigen delivery. Tissue Barriers 2015; 3:e1004975. [PMID: 25838974 DOI: 10.1080/21688370.2015.1004975] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Accepted: 12/26/2014] [Indexed: 12/30/2022] Open
Abstract
M cells are a subset of mucosal epithelial cells with specialized capability to transport antigens across the mucosal barrier, but there is limited information on antigen transfer in the subepithelial zone due to the challenges in tracking microparticles and antigens that are transcytosed by this unique cell. Using transgenic reporter mice expressing dsRed in the cytoplasm of M cells and EGFP in myeloid cells, we observed that the M cell basolateral pocket hosts a close interaction between B lymphocytes and dendritic cells. Interestingly, we identified a population of previously undescribed M cell-derived vesicles (MCM) that are constitutively shed into the subepithelial space and readily taken up by CX3CR1(+)CD11b(+) CD11c(+) dendritic cells. These MCM are characterized by their cytoplasmic dsRed confirming their origin from the M cell cytoplasm. MCM showed preferential colocalization in dendritic cells with transcytosed bacteria but not transcytosed polystyrene beads, indicating a selective sorting of cargo fate in the subepithelial zone. The size and number of MCM were found to be upregulated by bacterial transcytosis and soluble toll-like receptor 2 (TLR2) agonist, further pointing to dynamic regulation of this mechanism. These results suggest that MCM provide a unique function by delivering to dendritic cells, various materials such as M cell-derived proteins, effector proteins, toxins, and particles found in the M cell cytoplasm during infection or surveillance.
Collapse
Affiliation(s)
- Olivia S Sakhon
- Division of Biomedical Sciences; School of Medicine ; University of California , Riverside; Riverside, CA USA
| | - Brittany Ross
- Division of Biomedical Sciences; School of Medicine ; University of California , Riverside; Riverside, CA USA
| | - Veronica Gusti
- Division of Biomedical Sciences; School of Medicine ; University of California , Riverside; Riverside, CA USA
| | - An Joseph Pham
- Division of Biomedical Sciences; School of Medicine ; University of California , Riverside; Riverside, CA USA
| | - Kathy Vu
- Division of Biomedical Sciences; School of Medicine ; University of California , Riverside; Riverside, CA USA
| | - David D Lo
- Division of Biomedical Sciences; School of Medicine ; University of California , Riverside; Riverside, CA USA
| |
Collapse
|
17
|
Arakelyan A, Ivanova O, Vasilieva E, Grivel JC, Margolis L. Antigenic composition of single nano-sized extracellular blood vesicles. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2014; 11:489-98. [PMID: 25481806 DOI: 10.1016/j.nano.2014.09.020] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 09/24/2014] [Accepted: 09/30/2014] [Indexed: 12/12/2022]
Abstract
Extracellular vesicles (EVs) are important in normal physiology and are altered in various pathologies. EVs produced by different cells are antigenically different. Since the majority of EVs are too small for routine flow cytometry, EV composition is studied predominantly in bulk, thus not addressing their antigenic heterogeneity. Here, we describe a nanoparticle-based technique for analyzing antigens on single nano-sized EVs. The technique consists of immuno-capturing of EVs with 15-nm magnetic nanoparticles, staining captured EVs with antibodies against their antigens, and separating them from unbound EVs and free antibodies in a magnetic field, followed by flow analysis. This technique allows us to characterize EVs populations according to their antigenic distribution, including minor EV fractions. We demonstrated that the individual blood EVs carry different sets of antigens, none being ubiquitous, and quantified their distribution. The physiological significance of antigenically different EVs and their correlation with different pathologies can now be directly addressed. From the clinical editor: This study reports a nanoparticle-based technique for analyzing antigens on single nano-sized extracellular vehicles (EV). The technique consists of immuno-capturing of EVs with 15-nm magnetic nanoparticles, followed by staining the captured EVs with antibodies and separating them via a magnetic field, followed by flow analysis. This technique enables studies of antigenic properties of individual EVs that conventionally can only be studied in bulk.
Collapse
Affiliation(s)
- Anush Arakelyan
- Program in Physical Biology, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA
| | - Oxana Ivanova
- Atherothrombosis Department, Moscow State University of Medicine and Dentistry, Moscow, Russia
| | - Elena Vasilieva
- Atherothrombosis Department, Moscow State University of Medicine and Dentistry, Moscow, Russia
| | - Jean-Charles Grivel
- Program in Physical Biology, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA.
| | - Leonid Margolis
- Program in Physical Biology, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA.
| |
Collapse
|
18
|
Raz L, Jayachandran M, Tosakulwong N, Lesnick TG, Wille SM, Murphy MC, Senjem ML, Gunter JL, Vemuri P, Jack CR, Miller VM, Kantarci K. Thrombogenic microvesicles and white matter hyperintensities in postmenopausal women. Neurology 2013; 80:911-8. [PMID: 23408873 DOI: 10.1212/wnl.0b013e3182840c9f] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To determine the association of conventional cardiovascular risk factors, markers of platelet activation, and thrombogenic blood-borne microvesicles with white matter hyperintensity (WMH) load and progression in recently menopausal women. METHODS Women (n = 95) enrolled in the Mayo Clinic Kronos Early Estrogen Prevention Study underwent MRI at baseline and at 18, 36, and 48 months after randomization to hormone treatments. Conventional cardiovascular risk factors, carotid intima-medial thickness, coronary arterial calcification, plasma lipids, markers of platelet activation, and thrombogenic microvesicles were measured at baseline. WMH volumes were calculated using a semiautomated segmentation algorithm based on fluid-attenuated inversion recovery MRI. Correlations of those parameters with baseline WMH and longitudinal change in WMH were adjusted for age, months past menopause, and APOE ε4 status in linear regression analysis. RESULTS At baseline, WMH were present in all women. The WMH to white matter volume fraction at baseline was 0.88% (0.69%, 1.16%). WMH volume increased by 122.1 mm(3) (95% confidence interval: -164.3, 539.5) at 36 months (p = 0.003) and 155.4 mm(3) (95% confidence interval: -92.13, 599.4) at 48 months (p < 0.001). These increases correlated with numbers of platelet-derived and total thrombogenic microvesicles at baseline (p = 0.03). CONCLUSION Associations of platelet-derived, thrombogenic microvesicles at baseline and increases in WMH suggest that in vivo platelet activation may contribute to a cascade of events leading to development of WMH in recently menopausal women.
Collapse
Affiliation(s)
- Limor Raz
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Leukocyte- and platelet-derived microvesicle interactions following in vitro and in vivo activation of toll-like receptor 4 by lipopolysaccharide. PLoS One 2011; 6:e25504. [PMID: 21966536 PMCID: PMC3180459 DOI: 10.1371/journal.pone.0025504] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Accepted: 09/06/2011] [Indexed: 12/18/2022] Open
Abstract
Background Pro-coagulant membrane microvesicles (MV) derived from platelets and leukocytes are shed into the circulation following receptor-mediated activation, cell-cell interaction, and apoptosis. Platelets are sentinel markers of toll-like receptor 4 (TLR4) activation. Experiments were designed to evaluate the time course and mechanism of direct interactions between platelets and leukocytes following acute activation of TLR4 by bacterial lipopolysaccharide (LPS). Methodology/Principal Findings Blood from age-matched male and female wild type (WT) and TLR4 gene deleted (dTLR4) mice was incubated with ultra-pure E. coli LPS (500 ng/ml) for up to one hour. At designated periods, leukocyte antigen positive platelets, platelet antigen positive leukocytes and cell-derived MV were quantified by flow cytometry. Numbers of platelet- or leukocyte-derived MV did not increase within one hour following in vitro exposure of blood to LPS. However, with LPS stimulation numbers of platelets staining positive for both platelet- and leukocyte-specific antigens increased in blood derived from WT but not dTLR4 mice. This effect was blocked by inhibition of TLR4 signaling mediated by My88 and TRIF. Seven days after a single intravenous injection of LPS (500 ng/mouse or 20 ng/gm body wt) to WT mice, none of the platelets stained for leukocyte antigen. However, granulocytes, monocytes and apoptotic bodies stained positive for platelet antigens. Conclusions/Significance Within one hour of exposure to LPS, leukocytes exchange surface antigens with platelets through TLR4 activation. In vivo, leukocyte expression of platelet antigen is retained after a single exposure to LPS following turn over of the platelet pool. Acute expression of leukocyte antigen on platelets within one hour of exposure to LPS and the sustained expression of platelet antigen on leukocytes following a single acute exposure to LPS in vivo explains, in part, associations of platelets and leukocytes in response to bacterial infection and changes in thrombotic propensity of the blood.
Collapse
|