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Nakladal D, Sijbesma JWA, Visser LM, Tietge UJF, Slart RHJA, Deelman LE, Henning RH, Hillebrands JL, Buikema H. Perivascular adipose tissue-derived nitric oxide compensates endothelial dysfunction in aged pre-atherosclerotic apolipoprotein E-deficient rats. Vascul Pharmacol 2021; 142:106945. [PMID: 34801679 DOI: 10.1016/j.vph.2021.106945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 11/05/2021] [Accepted: 11/15/2021] [Indexed: 10/19/2022]
Abstract
BACKGROUND AND AIMS Atherosclerosis is a major contributor to global mortality and is accompanied by vascular inflammation and endothelial dysfunction. Perivascular adipose tissue (PVAT) is an established regulator of vascular function with emerging implications in atherosclerosis. We investigated the modulation of aortic relaxation by PVAT in aged rats with apolipoprotein E deficiency (ApoE-/-) fed a high-fat diet as a model of early atherosclerosis. METHODS AND RESULTS ApoE-/- rats (N = 7) and wild-type Sprague-Dawley controls (ApoE+/+, N = 8) received high-fat diet for 51 weeks. Hyperlipidemia was confirmed in ApoE-/- rats by elevated plasma cholesterol (p < 0.001) and triglyceride (p = 0.025) levels. Early atherosclerosis was supported by increased intima/media thickness ratio (p < 0.01) and ED1-positive macrophage influx in ApoE-/- aortic intima (p < 0.001). Inflammation in ApoE-/- PVAT was characteristic by an increased [18F]FDG uptake (p < 0.01), ED1-positive macrophage influx (p = 0.0003), mRNA expression levels of CD68 (p < 0.001) and IL-1β (p < 0.01), and upregulated iNOS protein (p = 0.011). The mRNAs of MCP-1, IL-6 and adiponectin remained unchanged in PVAT. Aortic PVAT volume measured with micro-PET/CT was increased in ApoE-/- rats (p < 0.01). Maximal endothelium-dependent relaxation (EDR) to acetylcholine in ApoE-/- aortic rings without PVAT was severely impaired (p = 0.012) compared with controls, while ApoE-/- aortic rings with PVAT showed higher EDR than controls. All EDR responses were blocked by L-NMMA and the expression of eNOS mRNA was increased in ApoE-/- PVAT (p = 0.035). CONCLUSION Using a rat ApoE-/- model of early atherosclerosis, we capture a novel mechanism by which inflammatory PVAT compensates severe endothelial dysfunction by contributing NO upon cholinergic stimulation.
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Affiliation(s)
- D Nakladal
- Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713GZ Groningen, the Netherlands.
| | - J W A Sijbesma
- Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713GZ Groningen, the Netherlands
| | - L M Visser
- Department of Pathology & Medical Biology, Pathology division, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713GZ Groningen, the Netherlands
| | - U J F Tietge
- Department of Pediatrics, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands; Division of Clinical Chemistry, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden; Clinical Chemistry, Karolinska University Laboratory, Karolinska University Hospital, SE-141 86 Stockholm, Sweden
| | - R H J A Slart
- Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713GZ Groningen, the Netherlands; Faculty of Science and Technology Biomedical, Photonic Imaging, University of Twente, Enschede, the Netherlands
| | - L E Deelman
- Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713GZ Groningen, the Netherlands
| | - R H Henning
- Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713GZ Groningen, the Netherlands
| | - J L Hillebrands
- Department of Pathology & Medical Biology, Pathology division, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713GZ Groningen, the Netherlands
| | - H Buikema
- Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713GZ Groningen, the Netherlands
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Sijbesma JWA, Van Waarde A, Kristensen S, Kion I, Tietge UJF, Hillebrands JL, Buikema H, Nakladal D, Liu F, Boersma HH, Dierckx RAJO, Slart RHJA. Characterization of apolipoprotein E-deficient rats as novel model for atherosclerosis imaging. Eur Heart J Cardiovasc Imaging 2021. [DOI: 10.1093/ehjci/jeab111.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
The apolipoprotein E-deficient (apoE-/-) mouse is a well-established atherosclerotic model with impaired lipoprotein clearance and development of vessel plaques. However, the small size of the mouse limits its use as an animal model in longitudinal positron emission tomography (PET) imaging studies of atherosclerosis. Recently, apoE-/- rats have become available. This study addresses the suitability of the apoE-/- rat as model for atherosclerotic PET imaging.
Methods
Ten male apoE-/- rats and ten male control rats (apoE+/+) (age 10+/-1 weeks), each fed with a Western diet, were injected at baseline week 4, 12, 26 and 51, with 60 MBq of [18F]2-fluoro-2-deoxy-D-glucose. Plasma cholesterol, body weight and fat were measured. 3h after injection, a computed tomography (CT) and a 20-min PET scan were made. After the final scan, aortic tissue was collected for histological staining.
Results
Cholesterol levels started to increase after 4 weeks in the apoE-/- rats, whereas in the apoE+/+ rats levels stayed stable. Body weight and body fat increased more rapidly in the apoE-/- rats but were similar in both strains at the end of the study. SUVmean and max in the aortic arch and abdominal aorta were significantly higher (p < 0.001) in apoE-/- versus apoE+/+ rats at weeks 12, 26 and 51. Oil red O staining showed lesions in 20.0 % of the surface of the aortic arch in the apoE-/- rats. Hardly no fatty streaks were detected in the apoE+/+ rats (2.29%). More histology data is being analyzed.
Conclusion
Plasma cholesterol levels were elevated in apoE-/- rats. PET imaging demonstrated differences in [18F]-FDG uptake in the aortic arch and abdominal aorta after 12, 26 and 51 weeks. Combined, these data demonstrate that apoE-/- rats represent a useful preclinical model for the non-invasive assessment of atherosclerosis in longitudinal studies.
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Affiliation(s)
- JWA Sijbesma
- University Medical Center Groningen, Nuclear Medicine and Molecular Imaging, Groningen, Netherlands (The)
| | - A Van Waarde
- University Medical Center Groningen, Nuclear Medicine and Molecular Imaging, Groningen, Netherlands (The)
| | - S Kristensen
- University Medical Center Groningen, Nuclear Medicine and Molecular Imaging, Groningen, Netherlands (The)
| | - I Kion
- University Medical Center Groningen, Nuclear Medicine and Molecular Imaging, Groningen, Netherlands (The)
| | - UJF Tietge
- Karolinska Institutet, Department of Laboratory Medicine, Stockholm, Sweden
| | - JL Hillebrands
- University Medical Center Groningen, Department of Pathology, Groningen, Netherlands (The)
| | - H Buikema
- University Medical Center Groningen, Department of Pediatrics, Groningen, Netherlands (The)
| | - D Nakladal
- University Medical Center Groningen, Department of Pediatrics, Groningen, Netherlands (The)
| | - F Liu
- University Medical Center Groningen, Department of Pediatrics, Groningen, Netherlands (The)
| | - HH Boersma
- University Medical Center Groningen, Nuclear Medicine and Molecular Imaging, Groningen, Netherlands (The)
| | - RAJO Dierckx
- University Medical Center Groningen, Nuclear Medicine and Molecular Imaging, Groningen, Netherlands (The)
| | - RHJA Slart
- University Medical Center Groningen, Nuclear Medicine and Molecular Imaging, Groningen, Netherlands (The)
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Nagy RA, Homminga I, Jia C, Liu F, Anderson JLC, Hoek A, Tietge UJF. Trimethylamine-N-oxide is present in human follicular fluid and is a negative predictor of embryo quality. Hum Reprod 2021; 35:81-88. [PMID: 31916569 PMCID: PMC9185935 DOI: 10.1093/humrep/dez224] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 07/25/2019] [Indexed: 12/12/2022] Open
Abstract
STUDY QUESTION Are levels of trimethylamine-N-oxide (TMAO) in human follicular fluid (FF) related to IVF outcomes? SUMMARY ANSWER Higher levels of TMAO are a negative predictor of oocyte fertilization and embryo quality. WHAT IS KNOWN ALREADY TMAO is a metabolic product of dietary choline and l-carnitine produced via subsequent enzymatic modifications by the intestinal microbiota and hepatocytes. TMAO promotes inflammatory and oxidative stress pathways and has been characterized as a causative biomarker for the development of cardiometabolic disease. STUDY DESIGN, SIZE, DURATION For the present cross-sectional study, samples (FF and plasma) from 431 modified natural cycle (MNC)-IVF cycles of 132 patients were collected prospectively between October 2014 and March 2018 in a single academic medical center. PARTICIPANTS/MATERIALS, SETTING, METHODS TMAO and its precursors (choline, l-carnitine and gamma-butyrobetaine) were measured by ultra-high-performance liquid chromatography/mass spectrometry in (i) matched FF and plasma from 63 MNC-IVF cycles, in order to compare metabolite levels in the two matrices and (ii) FF from 232 MNC-IVF cycles in which only one oocyte was retrieved at follicular puncture. The association between metabolite levels and oocyte fertilization, embryo fragmentation percentage, embryo quality and the occurrence of pregnancy was analyzed using multilevel generalized estimating equations with adjustment for patient and cycle characteristics. MAIN RESULTS AND THE ROLE OF CHANCE The level of choline was higher in FF as compared to matched plasma (P < 0.001). Conversely, the levels of TMAO and gamma-butyrobetaine were lower in FF as compared to plasma (P = 0.001 and P = 0.075, respectively). For all metabolites, there was a positive correlation between FF and plasma levels. Finally, levels of TMAO and its gut-derived precursor gamma-butyrobetaine were lower in FF from oocytes that underwent normal fertilization (TMAO: odds ratio [OR] 0.66 [0.49–0.90], P = 0.008 per 1.0-μmol/L increase; gamma-butyrobetaine: OR 0.77 [0.60–1.00], P = 0.047 per 0.1-μmol/L increase) and developed into top-quality embryos (TMAO: OR 0.56 [0.42–0.76], P < 0.001 per 1.0-μmol/L increase; gamma-butyrobetaine: OR 0.79 [0.62–1.00], P = 0.050 per 0.1-μmol/L increase) than in FF from oocytes of suboptimal development. LIMITATIONS, REASONS FOR CAUTION The individual contributions of diet, gut bacteria and liver to the metabolite pools have not been quantified in this analysis. WIDER IMPLICATIONS OF THE FINDINGS More research on the contribution of diet and the effect of gut bacteria on FF TMAO is warranted. Since TMAO integrates diet, microbiota and genetic setup of the person, our results indicate potential important clinical implications for its use as biomarker for lifestyle interventions to improve fertility. STUDY FUNDING/COMPETING INTEREST(S) No external funding was received for this project. The Department of Obstetrics and Gynecology of the University Medical Center Groningen received an unrestricted educational grant of Ferring Pharmaceutical BV, the Netherlands. The authors have no other conflicts of interest. TRIAL REGISTRATION NUMBER Netherlands Trial Register number NTR4409.
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Affiliation(s)
- R A Nagy
- Department of Pediatrics, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands.,Department of Obstetrics and Gynecology, Section Reproductive Medicine, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - I Homminga
- Department of Obstetrics and Gynecology, Section Reproductive Medicine, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - C Jia
- Department of Pediatrics, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands.,Division of Clinical Chemistry, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
| | - F Liu
- Department of Pediatrics, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands.,Division of Clinical Chemistry, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
| | - J L C Anderson
- Department of Pediatrics, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - A Hoek
- Department of Obstetrics and Gynecology, Section Reproductive Medicine, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - U J F Tietge
- Department of Pediatrics, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands.,Division of Clinical Chemistry, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden.,Clinical Chemistry, Karolinska University Laboratory, Karolinska University Hospital, SE-141 86 Stockholm, Sweden
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Bakker LEH, Boon MR, Annema W, Dikkers A, van Eyk HJ, Verhoeven A, Mayboroda OA, Jukema JW, Havekes LM, Meinders AE, Willems van Dijk K, Jazet IM, Tietge UJF, Rensen PCN. HDL functionality in South Asians as compared to white Caucasians. Nutr Metab Cardiovasc Dis 2016; 26:697-705. [PMID: 27052926 DOI: 10.1016/j.numecd.2016.02.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2015] [Revised: 01/31/2016] [Accepted: 02/10/2016] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND AIMS South Asians have an exceptionally high risk of developing cardiovascular disease compared to white Caucasians. A contributing factor might be dysfunction of high density lipoprotein (HDL). We aimed to compare HDL function in different age groups of both ethnicities. METHODS AND RESULTS HDL functionality with respect to cholesterol efflux, anti-oxidation and anti-inflammation was determined using fasting, apoB-depleted, plasma samples from South Asian and white Caucasian neonates (n = 14 each), adolescent healthy men (n = 12 each, 18-25 y), and adult overweight men (n = 12 each, 40-50 y). Adolescents were subjected to a 5-day high fat high calorie diet (HCD) and adults to an 8-day very low calorie diet (LCD). Additionally, HDL composition was measured in adolescents and adults using (1)H-NMR spectroscopy. Anti-oxidative capacity was lower in South Asian adults before LCD (19.4 ± 2.1 vs. 25.8 ± 1.2%, p = 0.045, 95%-CI = [0.1; 12.7]) and after LCD (16.4 ± 2.4 vs. 27.6 ± 2.7%, p = 0.001, 95%-CI = [4.9; 17.5]). Anti-inflammatory capacity was reduced in South Asian neonates (23.8 ± 1.2 vs. 34.9 ± 1.3%, p = 0.000001, 95%-CI = [-14.6; -7.5]), and was negatively affected by an 8-day LCD only in South Asian adults (-12.2 ± 4.3%, p = 0.005, 95%-CI = [-5.9; -1.2]). Cholesterol efflux capacity was increased in response to HCD in adolescents (South Asians: +6.3 ± 2.9%, p = 0.073, 95%-CI = [-0.02; 0.46], Caucasians: +11.8 ± 3.4%, p = 0.002, 95%-CI = [0.17;0.65]) and decreased after LCD in adults (South Asians: -10.3 ± 2.4%, p < 0.001, 95%-CI = [-0.57; -0.20], Caucasians: -13.7 ± 1.9%, p < 0.00001, 95%-CI = [-0.67; -0.33]). Although subclass analyses of HDL showed no differences between ethnicities, cholesterol efflux correlated best with cholesterol and phospholipid within small HDL compared to other HDL subclasses and constituents. CONCLUSION Impaired HDL functionality in South Asians may be a contributing factor to their high CVD risk. CLINICAL TRIAL REGISTRATION NTR 2473 (URL: http://www.trialregister.nl/).
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Affiliation(s)
- L E H Bakker
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands
| | - M R Boon
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands; Einthoven Laboratory for Experimental Vascular Medicine, LUMC, Leiden, The Netherlands.
| | - W Annema
- Dept. Pediatrics, University Medical Center Groningen, Groningen, The Netherlands; Top Institute Food and Nutrition, Wageningen, The Netherlands
| | - A Dikkers
- Dept. Pediatrics, University Medical Center Groningen, Groningen, The Netherlands
| | - H J van Eyk
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands
| | - A Verhoeven
- Center for Proteomics and Metabolomics, LUMC, Leiden, The Netherlands
| | - O A Mayboroda
- Center for Proteomics and Metabolomics, LUMC, Leiden, The Netherlands
| | - J W Jukema
- Dept. Cardiology, LUMC, Leiden, The Netherlands
| | - L M Havekes
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands; Einthoven Laboratory for Experimental Vascular Medicine, LUMC, Leiden, The Netherlands; Dept. Cardiology, LUMC, Leiden, The Netherlands
| | - A E Meinders
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands
| | - K Willems van Dijk
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands; Dept. Human Genetics, LUMC, Leiden, The Netherlands
| | - I M Jazet
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands
| | - U J F Tietge
- Dept. Pediatrics, University Medical Center Groningen, Groningen, The Netherlands; Top Institute Food and Nutrition, Wageningen, The Netherlands
| | - P C N Rensen
- Dept. Medicine, Div. Endocrinology, Leiden University Medical Center (LUMC), Leiden, The Netherlands; Einthoven Laboratory for Experimental Vascular Medicine, LUMC, Leiden, The Netherlands
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Nagy RA, van Montfoort APA, Dikkers A, van Echten-Arends J, Homminga I, Land JA, Hoek A, Tietge UJF. Presence of bile acids in human follicular fluid and their relation with embryo development in modified natural cycle IVF. Hum Reprod 2015; 30:1102-9. [PMID: 25753582 DOI: 10.1093/humrep/dev034] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 02/03/2015] [Indexed: 12/20/2022] Open
Abstract
STUDY QUESTION Are bile acids (BA) and their respective subspecies present in human follicular fluid (FF) and do they relate to embryo quality in modified natural cycle IVF (MNC-IVF)? SUMMARY ANSWER BA concentrations are 2-fold higher in follicular fluid than in serum and ursodeoxycholic acid (UDCA) derivatives were associated with development of top quality embryos on Day 3 after fertilization. WHAT IS KNOWN ALREADY Granulosa cells are capable of synthesizing BA, but a potential correlation with oocyte and embryo quality as well as information on the presence and role of BA subspecies in follicular fluid have yet to be investigated. STUDY DESIGN, SIZE, DURATION Between January 2001 and June 2004, follicular fluid and serum samples were collected from 303 patients treated in a single academic centre that was involved in a multicentre cohort study on the effectiveness of MNC-IVF. PARTICIPANTS/MATERIALS, SETTING, METHODS Material from patients who underwent a first cycle of MNC-IVF was used. Serum was not stored from all patients, and the available material comprised 156 follicular fluid and 116 matching serum samples. Total BA and BA subspecies were measured in follicular fluid and in matching serum by enzymatic fluorimetric assay and liquid chromatography-mass spectrometry, respectively. The association of BA in follicular fluid with oocyte and embryo quality parameters, such as fertilization rate and cell number, presence of multinucleated blastomeres and percentage of fragmentation on Day 3, was analysed. MAIN RESULTS AND THE ROLE OF CHANCE Embryos with eight cells on Day 3 after oocyte retrieval were more likely to originate from follicles with a higher level of UDCA derivatives than those with fewer than eight cells (P < 0.05). Furthermore, follicular fluid levels of chenodeoxycholic derivatives were higher and deoxycholic derivatives were lower in the group of embryos with fragmentation compared with those without (each P < 0.05). Levels of total BA were 2-fold higher in follicular fluid compared with serum (P < 0.001), but had no predictive value for oocyte and embryo quality. LIMITATIONS, REASONS FOR CAUTION Only samples originating from first cycle MNC-IVF were used, which resulted in 14 samples only from women with an ongoing pregnancy, therefore further prospective studies are required to confirm the association of UDCA with IVF pregnancy outcomes. The inter-cycle variability of BA levels in follicular fluid within individuals has yet to be investigated. We checked for macroscopic signs of contamination of follicular fluid by blood but the possibility that small traces of blood were present within the follicular fluid remains. Finally, although BA are considered stable when stored at -20°C, there was a time lag of 10 years between the collection and analysis of follicular fluid and serum samples. WIDER IMPLICATIONS OF THE FINDINGS The favourable relation between UDCA derivatives in follicular fluid and good embryo development and quality deserves further prospective research, with live birth rates as the end-point. STUDY FUNDING/COMPETING INTERESTS This work was supported by a grant from the Netherlands Organisation for Scientific Research (VIDI Grant 917-56-358 to U.J.F.T.). No competing interests are reported.
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Affiliation(s)
- R A Nagy
- Department of Obstetrics and Gynaecology, Section Reproductive Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands Department of Pediatrics, Center for Liver, Digestive, and Metabolic Diseases, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - A P A van Montfoort
- Department of Obstetrics and Gynaecology, Section Reproductive Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands Department of Obstetrics & Gynaecology, GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - A Dikkers
- Department of Pediatrics, Center for Liver, Digestive, and Metabolic Diseases, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - J van Echten-Arends
- Department of Obstetrics and Gynaecology, Section Reproductive Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - I Homminga
- Department of Obstetrics and Gynaecology, Section Reproductive Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - J A Land
- Department of Obstetrics and Gynaecology, Section Reproductive Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - A Hoek
- Department of Obstetrics and Gynaecology, Section Reproductive Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - U J F Tietge
- Department of Pediatrics, Center for Liver, Digestive, and Metabolic Diseases, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
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Adepu S, Katta K, Tietge UJF, Kwakernaak AJ, Dam W, van Goor H, Dullaart RPF, Navis GJ, Bakker SJL, van den Born J. Hepatic syndecan-1 changes associate with dyslipidemia after renal transplantation. Am J Transplant 2014; 14:2328-38. [PMID: 25154787 DOI: 10.1111/ajt.12842] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 04/25/2014] [Accepted: 05/18/2014] [Indexed: 01/25/2023]
Abstract
Syndecan-1 is a transmembrane heparan sulfate (HS) proteoglycan present on hepatocytes and involved in uptake of triglyceride-rich lipoproteins via its HS polysaccharide side chains. We hypothesized that altered hepatic syndecan-1 metabolism could be involved in dyslipidemia related to renal transplantation. In a rat renal transplantation model elevated plasma triglycerides were associated with fivefold increased expression of hepatic syndecan-1 mRNA (p < 0.01), but not protein. Expression of syndecan-1 sheddases (ADAM17, MMP9) and heparanase was significantly up-regulated after renal transplantation (all p < 0.05). Profiling of HS side chains revealed loss of hepatic HS upon renal transplantation accompanied by significant decreased functional capacity for VLDL binding (p = 0.02). In a human renal transplantation cohort (n = 510), plasma levels of shed syndecan-1 were measured. Multivariate analysis showed plasma syndecan-1 to be independently associated with triglycerides (p < 0.0001) and inversely with HDL cholesterol (p < 0.0001). Last, we show a physical association of syndecan-1 to HDL from renal transplant recipients (RTRs), but not to HDL from healthy controls. Our data suggest that after renal transplantation loss of hepatic HS together with increased syndecan-1 shedding hampers lipoprotein binding and uptake by the liver contributing to dyslipidemia. Our data open perspectives toward improvement of lipid profiles by targeted inhibition of syndecan-1 catabolism in renal transplantation.
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Affiliation(s)
- S Adepu
- Nephrology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
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Brinkmann O, Schmerbach K, Tietge UJF, Dietrich T, Guski H, Linz D, Kühn H, Patzak A, Wilfert K. Changes in arterial function in a mouse model of human familial hypercholesterolaemia. Acta Physiol (Oxf) 2014; 211:61-72. [PMID: 24571057 DOI: 10.1111/apha.12262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 09/23/2013] [Accepted: 02/20/2014] [Indexed: 11/29/2022]
Abstract
AIM Atherosclerosis is the most common cause of cardiovascular disease. The ApoB mouse is a model for human familial hypercholesterolaemia and has a lipoprotein profile similar to that of humans with atherosclerosis. Therefore, it is a suitable model to investigate the changes in vasoreactivity during atherogenesis. This study investigates contractile and dilatative properties of arteries in this model in relation to age. METHODS Male ApoB mice and B6, wild-type (WT), mice were examined at age four or 18 months. Isometric measurements of 2-mm ring preparations of the aorta thoracica were performed using a wire myograph. Histological and biochemical methods served to determine atherosclerosis, lipid status and endothelial markers respectively. RESULTS Morphometric analysis showed that all old ApoB mice had severe atherosclerosis in the aorta. Atherosclerotic alteration of the aorta of the ApoB mice coincided with a diminished vasodilatation to acetylcholine. The phenylephrine response was significantly attenuated already to the same degree in the non-atherosclerotic aorta of the young ApoB mice as in the atherosclerotic aorta of the older ApoB mice. Serum parameters showed a rise in total cholesterol and triglycerides in the ApoB strain compared to WT mice. Soluble intercellular adhesion molecule (sICAM)-1 and soluble vascular adhesion molecule (sVCAM)-1 were increased in old compared to young ApoB mice. CONCLUSION The study shows that reduced acetylcholine-induced dilatation is related to the presence of atherosclerosis in old ApoB mice. Remarkably, the impaired vessel reactivity to phenylephrine already in young ApoB mice indicates early changes in vascular function in this model.
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Affiliation(s)
- O. Brinkmann
- Institute of Vegetative Physiology; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - K. Schmerbach
- Institute of Vegetative Physiology; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - U. J. F. Tietge
- Department of Pediatrics; University Medical Center Groningen; Groningen the Netherlands
| | - T. Dietrich
- Department of Cardiology and Internal Medicine; Deutsches Herzzentrum Berlin; Berlin Germany
| | - H. Guski
- Institute of Pathology; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - D. Linz
- Clinic for Internal Medicine III; University Hospital of Saarland; Homburg Germany
| | - H. Kühn
- Institute of Biochemistry; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - A. Patzak
- Institute of Vegetative Physiology; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - K. Wilfert
- Institute of Vegetative Physiology; Charité-Universitätsmedizin Berlin; Berlin Germany
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Ockenga J, Tietge UJF, Böker KHW, Manns MP, Brabant G, Bahr MJ. Distinct roles of free leptin, bound leptin and soluble leptin receptor during the metabolic-inflammatory response in patients with liver cirrhosis. Aliment Pharmacol Ther 2007; 25:1301-9. [PMID: 17509098 DOI: 10.1111/j.1365-2036.2007.03327.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Alteration of the leptin system appears to play a role in the inflammatory-metabolic response in catabolic diseases such as chronic liver diseases. AIM To investigate the association between leptin components, inflammatory markers and hepatic energy and substrate metabolism. METHODS We investigated in vivo hepatic substrate and leptin metabolism in 40 patients employing a combination of arterial and hepatic vein catheterization techniques and hepatic blood flow measurements. In addition to metabolic, inflammatory and neuroendocrine parameters, circulating levels of free leptin, bound leptin and soluble leptin receptor were determined. RESULTS Compared with controls, bound leptin and soluble leptin receptor levels were significantly elevated in cirrhosis, while free leptin did not increase. In cirrhosis bound leptin was correlated with soluble leptin receptor (r = 0.70, P < 0.001). Free leptin was positively correlated with metabolic parameters such as energy storage (body fat mass; r = 0.36, P < 0.05), insulin and insulin resistance (r = 0.48; r = 0.46, P < 0.01) as well as with hepatic glucose and energy release (r = 0.35 and r = 0.40, P < 0.05). In contrast, bound leptin and soluble leptin receptor were linked to proinflammatory cytokines and sympathetic activity (r = 0.61 and r = 0.56, P < 0.01). CONCLUSION The components of the leptin system (free leptin, bound leptin and soluble leptin receptor) have distinct roles in metabolic and inflammatory processes in patients with liver cirrhosis. The better understanding of this metabolic and inflammatory tissue-repair response may lead to innovative new therapeutic strategies in liver disease as well as in various other catabolic diseases.
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Affiliation(s)
- J Ockenga
- Department of Gastroenterology, Hepatology and Endocrinology, Medizinische Hochschule Hannover, Hannover, Germany.
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Tietge UJF, Cichon G, Büttner C, Genschel J, Heeren J, Gielow P, Grewe N, Dogar M, Beisiegel U, Manns MP, Lochs H, Burchert W, Schmidt HHJ. A sensitive noninvasive method for monitoring successful liver-directed gene transfer of the low-density lipoprotein receptor in Watanabe hyperlipidemic rabbits in vivo. Gene Ther 2004; 11:574-80. [PMID: 14724675 DOI: 10.1038/sj.gt.3302206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Noninvasive tools to quantitate transgene expression directly are a prerequisite for clinical gene therapy. We established a method to determine location, magnitude, and duration of low-density lipoprotein (LDL) receptor (LDLR) transgene expression after adenoviral gene transfer into LDLR-deficient Watanabe hypercholesterolemic rabbits by following tissue uptake of intravenously injected (111)In-labeled LDL using a scintillation camera. Liver-specific tracer uptake was calculated by normalizing the counts measured over the liver to counts measured over the heart that represent the circulating blood pool of the tracer (liver/heart (L/H) ratio). Our results indicate that the optimal time point for transgene imaging is 4 h after the tracer injection. Compared with control virus-injected rabbits, animals treated with the LDLR-expressing adenovirus showed seven-fold higher L/H ratios on day 6 after gene transfer, and had still 4.5-fold higher L/H ratios on day 30. This imaging method might be a useful strategy to obtain reliable data on functional transgene expression in clinical gene therapy trials of familial hypercholesterolemia.
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Affiliation(s)
- U J F Tietge
- Department of Medicine and NWFZ, Charité Campus Mitte, Humboldt University, Berlin, Germany
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Tietge UJF, Genschel J, Schmidt HHJ. A Q136Stop mutation in the ARH gene causing autosomal recessive hypercholesterolaemia with severely delayed LDL catabolism. J Intern Med 2003; 253:582-3. [PMID: 12702036 DOI: 10.1046/j.1365-2796.2003.01139.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Bahr MJ, Rosenau J, Tietge UJF, Caselitz M, Hofmann MW, Klempnauer J, Böker KHW, Strassburg CP, Manns MP. Immunosuppression and the prognosis of patients suffering from myeloproliferative disorders after liver transplantation. Transplant Proc 2002; 34:1493-4. [PMID: 12176453 DOI: 10.1016/s0041-1345(02)02943-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Matthias J Bahr
- Department of Gastroenterology, Hepatology and Endocrinology, Medizinische Hochschule Hannover, Hannover, Carl-Neuberg-Strasse 1, 30623 Hannover, Germany.
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