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Pezzino S, Luca T, Castorina M, Puleo S, Latteri S, Castorina S. Role of Perturbated Hemostasis in MASLD and Its Correlation with Adipokines. Life (Basel) 2024; 14:93. [PMID: 38255708 PMCID: PMC10820028 DOI: 10.3390/life14010093] [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: 11/30/2023] [Revised: 01/04/2024] [Accepted: 01/05/2024] [Indexed: 01/24/2024] Open
Abstract
The prevalence of metabolic dysfunction-associated steatotic liver disease (MASLD) continues to rise, making it one of the most prevalent chronic liver disorders. MASLD encompasses a range of liver pathologies, from simple steatosis to metabolic dysfunction-associated steatohepatitis (MASH) with inflammation, hepatocyte damage, and fibrosis. Interestingly, the liver exhibits close intercommunication with fatty tissue. In fact, adipose tissue could contribute to the etiology and advancement of MASLD, acting as an endocrine organ that releases several hormones and cytokines, with the adipokines assuming a pivotal role. The levels of adipokines in the blood are altered in people with MASLD, and recent research has shed light on the crucial role played by adipokines in regulating energy expenditure, inflammation, and fibrosis in MASLD. However, MASLD disease is a multifaceted condition that affects various aspects of health beyond liver function, including its impact on hemostasis. The alterations in coagulation mechanisms and endothelial and platelet functions may play a role in the increased vulnerability and severity of MASLD. Therefore, more attention is being given to imbalanced adipokines as causative agents in causing disturbances in hemostasis in MASLD. Metabolic inflammation and hepatic injury are fundamental components of MASLD, and the interrelation between these biological components and the hemostasis pathway is delineated by reciprocal influences, as well as the induction of alterations. Adipokines have the potential to serve as the shared elements within this complex interrelationship. The objective of this review is to thoroughly examine the existing scientific knowledge on the impairment of hemostasis in MASLD and its connection with adipokines, with the aim of enhancing our comprehension of the disease.
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Affiliation(s)
- Salvatore Pezzino
- Mediterranean Foundation “GB Morgagni”, 95125 Catania, Italy (M.C.); (S.C.)
| | - Tonia Luca
- Mediterranean Foundation “GB Morgagni”, 95125 Catania, Italy (M.C.); (S.C.)
- Department of Medical, Surgical Sciences and Advanced Technologies “G.F. Ingrassia”, University of Catania, 95123 Catania, Italy;
| | | | - Stefano Puleo
- Mediterranean Foundation “GB Morgagni”, 95125 Catania, Italy (M.C.); (S.C.)
| | - Saverio Latteri
- Department of Medical, Surgical Sciences and Advanced Technologies “G.F. Ingrassia”, University of Catania, 95123 Catania, Italy;
| | - Sergio Castorina
- Mediterranean Foundation “GB Morgagni”, 95125 Catania, Italy (M.C.); (S.C.)
- Department of Medical, Surgical Sciences and Advanced Technologies “G.F. Ingrassia”, University of Catania, 95123 Catania, Italy;
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Yuan L, Han J, van der Velden AIM, Vink H, de Mutsert R, Rosendaal FR, van Hylckama Vlieg A, Li-Gao R, Rabelink TJ, van den Berg BM. Sex-specific association between microvascular health and coagulation parameters: the Netherlands Epidemiology of Obesity study. J Thromb Haemost 2023; 21:2585-2595. [PMID: 37301258 DOI: 10.1016/j.jtha.2023.06.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 05/16/2023] [Accepted: 06/01/2023] [Indexed: 06/12/2023]
Abstract
BACKGROUND Microvascular dysfunction is a growing determinant of sex differences in coronary heart disease (CHD). Dysregulation of the coagulation system is involved in CHD pathogenesis and can be induced by endothelial glycocalyx (EG) perturbation. However, little is known about the link between EG function and coagulation parameters in population-based studies on sex specificity. OBJECTIVES We sought to examine the sex differences in the relationship between EG function and coagulation parameters in a middle-aged Dutch population. METHODS Using baseline measurements of 771 participants from the Netherlands Epidemiology of Obesity study (age, 56 years [IQR, 51-61 years]; 53% women; body mass index, 27.9 kg/m2 [IQR, 25.1-30.9 kg/m2]), associations between glycocalyx-related perfused boundary region (PBR) derived using sidestream dark-field imaging and coagulation parameters (factor [F]VIII/IX/XI; thrombin generation parameters; and fibrinogen) were investigated using linear regression analyses, adjusting for possible confounders (including C-reactive protein, leptin, and glycoprotein acetyls), followed by sex-stratified analyses. RESULTS There was a sex difference in the associations between PBR and coagulation parameters. Particularly in women, 1-SD PBR (both total and feed vessel, indicating poorer glycocalyx status) was associated with higher FIX activity ([1.8%; 95% CI, 0.3%-3.3%] and [2.0%; 95% CI, 0.5%-3.4%], respectively) and plasma fibrinogen levels ([5.1 mg/dL; 95% CI, 0.4-9.9 mg/dL] and [5.8 mg/dL; 95% CI, 1.1-10.6 mg/dL], respectively). Furthermore, 1-SD PBRcapillary was associated with higher FVIII activity (3.5%; 95% CI, 0.4%-6.5%) and plasma fibrinogen levels (5.3 mg/dL; 95% CI, 0.6-10.0 mg/dL). CONCLUSION We revealed a sex-specific association between microcirculatory health and procoagulant status, which suggests that microvascular health be considered during early development of CHD in women.
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Affiliation(s)
- Lushun Yuan
- Einthoven Laboratory for Vascular and Regenerative Medicine, Department of Internal Medicine, Nephrology, Leiden University Medical Center, Leiden, the Netherlands
| | - Jihee Han
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Anouk I M van der Velden
- Einthoven Laboratory for Vascular and Regenerative Medicine, Department of Internal Medicine, Nephrology, Leiden University Medical Center, Leiden, the Netherlands
| | - Hans Vink
- Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht, the Netherlands; MicroVascular Health Solutions LLC, Alpine, Utah, USA
| | - Renée de Mutsert
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Frits R Rosendaal
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | | | - Ruifang Li-Gao
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands; Metabolon Inc, Morrisville, North Carolina, USA
| | - Ton J Rabelink
- Einthoven Laboratory for Vascular and Regenerative Medicine, Department of Internal Medicine, Nephrology, Leiden University Medical Center, Leiden, the Netherlands
| | - Bernard M van den Berg
- Einthoven Laboratory for Vascular and Regenerative Medicine, Department of Internal Medicine, Nephrology, Leiden University Medical Center, Leiden, the Netherlands.
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Xie D, Stutz B, Li F, Chen F, Lv H, Sestan-Pesa M, Catarino J, Gu J, Zhao H, Stoddard CE, Carmichael GG, Shanabrough M, Taylor HS, Liu ZW, Gao XB, Horvath TL, Huang Y. TET3 epigenetically controls feeding and stress response behaviors via AGRP neurons. J Clin Invest 2022; 132:162365. [PMID: 36189793 PMCID: PMC9525119 DOI: 10.1172/jci162365] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 08/02/2022] [Indexed: 11/17/2022] Open
Abstract
The TET family of dioxygenases promote DNA demethylation by oxidizing 5-methylcytosine to 5-hydroxymethylcytosine (5hmC). Hypothalamic agouti-related peptide-expressing (AGRP-expressing) neurons play an essential role in driving feeding, while also modulating nonfeeding behaviors. Besides AGRP, these neurons produce neuropeptide Y (NPY) and the neurotransmitter GABA, which act in concert to stimulate food intake and decrease energy expenditure. Notably, AGRP, NPY, and GABA can also elicit anxiolytic effects. Here, we report that in adult mouse AGRP neurons, CRISPR-mediated genetic ablation of Tet3, not previously known to be involved in central control of appetite and metabolism, induced hyperphagia, obesity, and diabetes, in addition to a reduction of stress-like behaviors. TET3 deficiency activated AGRP neurons, simultaneously upregulated the expression of Agrp, Npy, and the vesicular GABA transporter Slc32a1, and impeded leptin signaling. In particular, we uncovered a dynamic association of TET3 with the Agrp promoter in response to leptin signaling, which induced 5hmC modification that was associated with a chromatin-modifying complex leading to transcription inhibition, and this regulation occurred in both the mouse models and human cells. Our results unmasked TET3 as a critical central regulator of appetite and energy metabolism and revealed its unexpected dual role in the control of feeding and other complex behaviors through AGRP neurons.
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Affiliation(s)
- Di Xie
- Department of Obstetrics, Gynecology and Reproductive Sciences.,Yale Center for Molecular and Systems Metabolism, and
| | - Bernardo Stutz
- Yale Center for Molecular and Systems Metabolism, and.,Department of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Feng Li
- Department of Obstetrics, Gynecology and Reproductive Sciences.,Yale Center for Molecular and Systems Metabolism, and
| | - Fan Chen
- Department of Obstetrics, Gynecology and Reproductive Sciences
| | - Haining Lv
- Department of Obstetrics, Gynecology and Reproductive Sciences.,Yale Center for Molecular and Systems Metabolism, and
| | - Matija Sestan-Pesa
- Yale Center for Molecular and Systems Metabolism, and.,Department of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Jonatas Catarino
- Yale Center for Molecular and Systems Metabolism, and.,Department of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Jianlei Gu
- Department of Biostatistics, Yale School of Public Health, New Haven, Connecticut, USA
| | - Hongyu Zhao
- Department of Biostatistics, Yale School of Public Health, New Haven, Connecticut, USA
| | - Christopher E Stoddard
- Department of Genetics and Genome Sciences, University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Gordon G Carmichael
- Department of Genetics and Genome Sciences, University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Marya Shanabrough
- Yale Center for Molecular and Systems Metabolism, and.,Department of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Hugh S Taylor
- Department of Obstetrics, Gynecology and Reproductive Sciences
| | - Zhong-Wu Liu
- Yale Center for Molecular and Systems Metabolism, and.,Department of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Xiao-Bing Gao
- Yale Center for Molecular and Systems Metabolism, and.,Department of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Tamas L Horvath
- Department of Obstetrics, Gynecology and Reproductive Sciences.,Yale Center for Molecular and Systems Metabolism, and.,Department of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut, USA.,Department of Neuroscience, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Yingqun Huang
- Department of Obstetrics, Gynecology and Reproductive Sciences.,Yale Center for Molecular and Systems Metabolism, and
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Frischmuth T, Hindberg K, Aukrust P, Ueland T, Brækkan SK, Hansen JB, Morelli VM. Plasma Levels of Leptin and Risk of Future Incident Venous Thromboembolism. Thromb Haemost 2021; 122:560-569. [PMID: 34264516 DOI: 10.1055/s-0041-1732295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
BACKGROUND Circulating levels of leptin, an adipocyte-derived hormone, are frequently elevated in obesity. Leptin has been reported to upregulate prothrombotic hemostatic factors in vitro and could potentially mediate venous thromboembolism (VTE) risk in obesity. However, whether leptin is associated with VTE remains uncertain. OBJECTIVE This article investigates the association between plasma leptin and risk of incident VTE, and the potential of leptin to mediate VTE risk in obesity. METHODS A population-based nested case-control study with 416 VTE cases and 848 age- and sex-matched controls was derived from the Tromsø Study. Logistic regression was used to calculate odds ratios (ORs) with 95% confidence intervals (CIs) for VTE across leptin quartiles. Analyses were performed separately in men and women using sex-specific quartile cut-offs determined in controls. RESULTS In the age-adjusted model, the VTE risk increased across leptin quartiles, particularly in men. Compared with the lowest quartile, the ORs for VTE in the highest quartile were 1.70 (95% CI 1.04-2.79) in men and 1.36 (95% CI 0.85-2.17) in women. However, with additional adjustment for body mass index (BMI), risk estimates were markedly attenuated in men (OR 1.03, 95% CI 0.55-1.93) and women (OR 0.82, 95% CI 0.45-1.48). The ORs for VTE were increased in obese men and women (BMI ≥ 30 kg/m2) and were only marginally affected after adjustment for leptin. CONCLUSION Our results indicate that the apparent association between plasma leptin levels and VTE risk is confounded by BMI and that leptin is not a relevant mediator for VTE risk in obesity.
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Affiliation(s)
- Tobias Frischmuth
- Department of Clinical Medicine, Thrombosis Research Center, UiT - The Arctic University of Norway, Tromsø, Norway
| | - Kristian Hindberg
- Department of Clinical Medicine, Thrombosis Research Center, UiT - The Arctic University of Norway, Tromsø, Norway
| | - Pål Aukrust
- Department of Clinical Medicine, Thrombosis Research Center, UiT - The Arctic University of Norway, Tromsø, Norway.,Faculty of Medicine, University of Oslo, Oslo, Norway.,Research Institute of Internal Medicine, Oslo University Hospital, Rikshospitalet, Oslo, Norway.,Section of Clinical Immunology and Infectious Diseases, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | - Thor Ueland
- Department of Clinical Medicine, Thrombosis Research Center, UiT - The Arctic University of Norway, Tromsø, Norway.,Faculty of Medicine, University of Oslo, Oslo, Norway.,Research Institute of Internal Medicine, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | - Sigrid K Brækkan
- Department of Clinical Medicine, Thrombosis Research Center, UiT - The Arctic University of Norway, Tromsø, Norway.,Division of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - John-Bjarne Hansen
- Department of Clinical Medicine, Thrombosis Research Center, UiT - The Arctic University of Norway, Tromsø, Norway.,Division of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Vânia M Morelli
- Department of Clinical Medicine, Thrombosis Research Center, UiT - The Arctic University of Norway, Tromsø, Norway
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Leptin in Atherosclerosis: Focus on Macrophages, Endothelial and Smooth Muscle Cells. Int J Mol Sci 2021; 22:ijms22115446. [PMID: 34064112 PMCID: PMC8196747 DOI: 10.3390/ijms22115446] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/11/2021] [Accepted: 05/17/2021] [Indexed: 02/06/2023] Open
Abstract
Increasing adipose tissue mass in obesity directly correlates with elevated circulating leptin levels. Leptin is an adipokine known to play a role in numerous biological processes including regulation of energy homeostasis, inflammation, vascular function and angiogenesis. While physiological concentrations of leptin may exhibit multiple beneficial effects, chronically elevated pathophysiological levels or hyperleptinemia, characteristic of obesity and diabetes, is a major risk factor for development of atherosclerosis. Hyperleptinemia results in a state of selective leptin resistance such that while beneficial metabolic effects of leptin are dampened, deleterious vascular effects of leptin are conserved attributing to vascular dysfunction. Leptin exerts potent proatherogenic effects on multiple vascular cell types including macrophages, endothelial cells and smooth muscle cells; these effects are mediated via an interaction of leptin with the long form of leptin receptor, abundantly expressed in atherosclerotic plaques. This review provides a summary of recent in vivo and in vitro studies that highlight a role of leptin in the pathogenesis of atherosclerotic complications associated with obesity and diabetes.
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Demeulemeester F, de Punder K, van Heijningen M, van Doesburg F. Obesity as a Risk Factor for Severe COVID-19 and Complications: A Review. Cells 2021; 10:933. [PMID: 33920604 PMCID: PMC8073853 DOI: 10.3390/cells10040933] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/13/2021] [Accepted: 04/14/2021] [Indexed: 02/07/2023] Open
Abstract
Emerging data suggest that obesity is a major risk factor for the progression of major complications such as acute respiratory distress syndrome (ARDS), cytokine storm and coagulopathy in COVID-19. Understanding the mechanisms underlying the link between obesity and disease severity as a result of SARS-CoV-2 infection is crucial for the development of new therapeutic interventions and preventive measures in this high-risk group. We propose that multiple features of obesity contribute to the prevalence of severe COVID-19 and complications. First, viral entry can be facilitated by the upregulation of viral entry receptors, like angiotensin-converting enzyme 2 (ACE2), among others. Second, obesity-induced chronic inflammation and disruptions of insulin and leptin signaling can result in impaired viral clearance and a disproportionate or hyper-inflammatory response, which together with elevated ferritin levels can be a direct cause for ARDS and cytokine storm. Third, the negative consequences of obesity on blood coagulation can contribute to the progression of thrombus formation and hemorrhage. In this review we first summarize clinical findings on the relationship between obesity and COVID-19 disease severity and then further discuss potential mechanisms that could explain the risk for major complications in patients suffering from obesity.
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Biguzzi E, Castelli F, Lijfering WM, Cannegieter SC, Eikenboom J, Rosendaal FR, van Hylckama Vlieg A. Rise of levels of von Willebrand factor and factor VIII with age: Role of genetic and acquired risk factors. Thromb Res 2020; 197:172-178. [PMID: 33221577 DOI: 10.1016/j.thromres.2020.11.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 10/29/2020] [Accepted: 11/11/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND Von Willebrand factor (VWF) levels are regulated by genetic and acquired factors. The acquired factors are mostly related to age and could be mediators of the age effect on VWF levels. OBJECTIVES To disentangle the role of genetic (sex, blood group) and acquired factors (comorbidities, body mass index, reduced kidney function, hormone use, and inflammation) in regulating von Willebrand factor antigen (VWF:Ag) and factor VIII activity (FVIII:C) levels in the normal population. METHODS Analysis were performed in a large population sample (2923 individuals) from the Multiple Environmental and Genetic Assessment of risk factors for venous thrombosis (MEGA study), after exclusion of individuals with active cancer and women who were pregnant or within nine months postpartum. The increase of VWF:Ag and FVIII:C with age was evaluated by linear regression after the age of 40 years. Analyses were adjusted for acquired factors and stratified for sex and blood group. RESULTS VWF:Ag and FVIII:C increased with age: increase per decade of age for VWF:Ag 18 IU/dL (95%CI 15-20) and for FVIII:C 12 IU/dL (95%CI 10-14). After adjustment for acquired factors, the increase per decade was 13 IU/dL (95%CI 10-16) for VWF:Ag and 9 IU/dL (95%CI 6-11) for FVIII:C. The stratified analysis for blood group showed higher increase in the non-O group, but these differences were annulled after adjustment for acquired factors. CONCLUSIONS VWF:Ag and FVIII:C increase with age. Carriers of blood group non-O present a steeper increase of VWF:Ag and FVIII:C with age, that is mediated by acquired factors.
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Affiliation(s)
- Eugenia Biguzzi
- IRCCS Fondazione Ca' Granda Ospedale Policlinico, A. Bianchi Bonomi Hemophilia and Thrombosis Center, Via Pace 9, 20122 Milan, Italy
| | | | - Willem M Lijfering
- Leiden University Medical Center, Department of Clinical Epidemiology, Albinusdreef 2, 2333ZA Leiden, the Netherlands
| | - Suzanne C Cannegieter
- Leiden University Medical Center, Department of Clinical Epidemiology, Albinusdreef 2, 2333ZA Leiden, the Netherlands
| | - Jeroen Eikenboom
- Leiden University Medical Center, Department of Internal Medicine, Division of Thrombosis and Hemostasis, Albinusdreef 2, 2333ZA Leiden, the Netherlands
| | - Frits R Rosendaal
- Leiden University Medical Center, Department of Clinical Epidemiology, Albinusdreef 2, 2333ZA Leiden, the Netherlands
| | - Astrid van Hylckama Vlieg
- Leiden University Medical Center, Department of Clinical Epidemiology, Albinusdreef 2, 2333ZA Leiden, the Netherlands.
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Expression profiles of the internal jugular and saphenous veins: Focus on hemostasis genes. Thromb Res 2020; 191:113-124. [PMID: 32438216 DOI: 10.1016/j.thromres.2020.04.039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 03/15/2020] [Accepted: 04/27/2020] [Indexed: 11/23/2022]
Abstract
INTRODUCTION Venous bed specificity could contribute to differential vulnerability to thrombus formation, and is potentially reflected in mRNA profiles. MATERIALS AND METHODS Microarray-based transcriptome analysis in wall and valve specimens from internal jugular (IJV) and saphenous (SV) veins collected during IJV surgical reconstruction in patients with impaired brain outflow. Multiplex antigenic assay in paired jugular and peripheral plasma samples. RESULTS Most of the top differentially expressed transcripts have been previously associated with both vascular and neurological disorders. Large expression differences of HOX genes, organ patterning regulators, pinpointed the vein positional identity. The "complement and coagulation cascade" emerged among enriched pathways. In IJV, upregulation of genes for coagulation inhibitors (TFPI, PROS1), activated protein C pathway receptors (THBD, PROCR), fibrinolysis activators (PLAT, PLAUR), and downregulation of the fibrinolysis inhibitor (SERPINE1) and of contact/amplification pathway genes (F11, F12), would be compatible with a thromboprotective profile in respect to SV. Further, in SV valve the prothrombinase complex genes (F5, F2) were up-regulated and the VWF showed the highest expression. Differential expression of several VWF regulators (ABO, ST3GAL4, SCARA5, CLEC4M) was also observed. Among other differentially expressed hemostasis-related genes, heparanase (HPSE)/heparanase inhibitor (HPSE2) were up-/down-regulated in IJV, which might support procoagulant features and disease conditions. The jugular plasma levels of several proteins, encoded by differentially expressed genes, were lower and highly correlated with peripheral levels. CONCLUSIONS The IJV and SV rely on differential expression of many hemostasis and hemostasis-related genes to balance local hemostasis, potentially related to differences in vulnerability to thrombosis.
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