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de Oliveira AA, Elder E, Spaans F, Graton ME, Quon A, Kirschenman R, Wooldridge AL, Cooke CLM, Davidge ST. Excessive hypercholesterolemia in pregnancy impairs rat uterine artery function via activation of Toll-like receptor 4. Clin Sci (Lond) 2024; 138:137-151. [PMID: 38299431 DOI: 10.1042/cs20231442] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 01/17/2024] [Accepted: 01/31/2024] [Indexed: 02/02/2024]
Abstract
Hypercholesterolemia in pregnancy is a physiological process required for normal fetal development. In contrast, excessive pregnancy-specific hypercholesterolemia increases the risk of complications, such as preeclampsia. However, the underlying mechanisms are unclear. Toll-like receptor 4 (TLR4) is a membrane receptor modulated by high cholesterol levels, leading to endothelial dysfunction; but whether excessive hypercholesterolemia in pregnancy activates TLR4 is not known. We hypothesized that a high cholesterol diet (HCD) during pregnancy increases TLR4 activity in uterine arteries, leading to uterine artery dysfunction. Sprague Dawley rats were fed a control diet (n=12) or HCD (n=12) during pregnancy (gestational day 6-20). Vascular function was assessed in main uterine arteries using wire myography (vasodilation to methacholine and vasoconstriction to phenylephrine; with and without inhibitors for mechanistic pathways) and pressure myography (biomechanical properties). Exposure to a HCD during pregnancy increased maternal blood pressure, induced proteinuria, and reduced the fetal-to-placental weight ratio for both sexes. Excessive hypercholesterolemia in pregnancy also impaired vasodilation to methacholine in uterine arteries, whereby at higher doses, methacholine caused vasoconstriction instead of vasodilation in only the HCD group, which was prevented by inhibition of TLR4 or prostaglandin H synthase 1. Endothelial nitric oxide synthase expression and nitric oxide levels were reduced in HCD compared with control dams. Vasoconstriction to phenylephrine and biomechanical properties were similar between groups. In summary, excessive hypercholesterolemia in pregnancy impairs uterine artery function, with TLR4 activation as a key mechanism. Thus, TLR4 may be a target for therapy development to prevent adverse perinatal outcomes in complicated pregnancies.
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Affiliation(s)
- Amanda A de Oliveira
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Emma Elder
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
- Department of Physiology, University of Alberta, Edmonton, Canada
| | - Floor Spaans
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Murilo E Graton
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Anita Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Raven Kirschenman
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Amy L Wooldridge
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Christy-Lynn M Cooke
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Sandra T Davidge
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
- Department of Physiology, University of Alberta, Edmonton, Canada
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Villalobos-Labra R, Liu R, Spaans F, Sáez T, Semeria Maitret T, Quon A, Sawamura T, Cooke CLM, Davidge ST. Placenta-Derived Extracellular Vesicles From Preeclamptic Pregnancies Impair Vascular Endothelial Function via Lectin-Like Oxidized LDL Receptor-1. Hypertension 2023; 80:2226-2238. [PMID: 37615097 DOI: 10.1161/hypertensionaha.123.21205] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 08/08/2023] [Indexed: 08/25/2023]
Abstract
BACKGROUND Preeclampsia is a complex syndrome that includes maternal vascular dysfunction. Syncytiotrophoblast-derived extracellular vesicles from preeclampsia placentas (preeclampsia-STBEVs) were shown to induce endothelial dysfunction, but an endothelial transmembrane mediator is still unexplored. The LOX-1 (lectin-like oxidized low-density lipoprotein receptor-1) is a transmembrane scavenger receptor that can cause endothelial dysfunction, and its expression is increased in the endothelium of preeclampsia women. In this study, we hypothesized that LOX-1 mediates the effects of preeclampsia-STBEVs on endothelial function. METHODS Preeclampsia-STBEVs were collected by perfusion of placentas from women with preeclampsia and in vitro and ex vivo endothelial cell function were assessed. RESULTS In human umbilical vein endothelial cells, inhibition of LOX-1 with LOX-1 blocking antibody (TS20) reduced the uptake of preeclampsia-STBEVs (61.3±8.8%). TS20 prevented the activation of ERK (extracellular signal-regulated kinase, a kinase downstream of LOX-1) and reduced the activation of NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells; 21.1±8.0%) and nitrative stress (23.2±10.3%) that was induced by preeclampsia-STBEVs. Vascular function was assessed by wire myography in isolated mesenteric arteries from pregnant rats that were incubated overnight with preeclampsia-STBEVs±TS20. TS20 prevented endothelium-dependent vasodilation impairment induced by preeclampsia-STBEVs. Nitric oxide contribution to the relaxation was reduced by preeclampsia-STBEVs, which was prevented by TS20. Superoxide dismutase or apocynin, an inhibitor of NOX (nicotinamide adenine dinucleotide phosphate oxidase), restored the impaired endothelium-dependent vasodilation in arteries exposed to preeclampsia-STBEVs. CONCLUSIONS Taken together, our findings demonstrate that LOX-1 mediates the endothelial dysfunction induced by preeclampsia-STBEVs. Our study further expands on the mechanisms that may lead to adverse outcomes in preeclampsia and proposes LOX-1 as a potential target for future interventions.
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Affiliation(s)
- Roberto Villalobos-Labra
- Department of Obstetrics and Gynecology (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Escuela de Medicina sede San Felipe (R.V.-L.), Universidad de Valparaíso, Chile
| | - Ricky Liu
- Department of Obstetrics and Gynecology (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Department of Physiology (R.L., S.T.D.), University of Alberta, Edmonton, Canada
| | - Floor Spaans
- Department of Obstetrics and Gynecology (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
| | - Tamara Sáez
- Department of Obstetrics and Gynecology (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Departamento de Medicina Interna (T. Sáez), Universidad de Valparaíso, Chile
- Centro de Investigaciones Biomédicas, Escuela de Medicina, Facultad de Medicina (T. Sáez), Universidad de Valparaíso, Chile
| | - Tamara Semeria Maitret
- Department of Laboratory Medicine and Pathology (T.S.M.), University of Alberta, Edmonton, Canada
| | - Anita Quon
- Department of Obstetrics and Gynecology (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
| | - Tatsuya Sawamura
- Departments of Molecular Pathophysiology and Life Innovation, Shinshu University, Matsumoto, Japan (T. Sawamura)
| | - Christy-Lynn M Cooke
- Department of Obstetrics and Gynecology (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
| | - Sandra T Davidge
- Department of Obstetrics and Gynecology (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Women and Children's Health Research Institute (R.V.-L., R.L., F.S., T. Sáez, A.Q., C.-L.M.C., S.T.D.), University of Alberta, Edmonton, Canada
- Department of Physiology (R.L., S.T.D.), University of Alberta, Edmonton, Canada
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Wooldridge A, Chan C, Spaans F, Quon A, Steinback C, Davenport M, Davidge S, Cooke CL. Increased stiffness of omental arteries from late pregnant women at advanced maternal age. Biosci Rep 2023; 43:BSR20230819. [PMID: 37493195 PMCID: PMC10447229 DOI: 10.1042/bsr20230819] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 07/06/2023] [Accepted: 07/25/2023] [Indexed: 07/27/2023] Open
Abstract
Advanced maternal age (≥35 years) is a risk factor for poor pregnancy outcomes. Pregnancy requires extensive maternal vascular adaptations, and with age, our blood vessels become stiffer and change in structure (collagen and elastin). However, the effect of advanced maternal age on the structure of human resistance arteries during pregnancy is unknown. As omental resistance arteries contribute to blood pressure regulation, assessing their structure in pregnancy may inform on the causal mechanisms underlying pregnancy complications in women of advanced maternal age. Omental fat biopsies were obtained from younger (<35 years) or advanced maternal age (≥35 years) women during caesarean delivery (n = 7-9/group). Arteries (200-300 µm) were isolated and passive mechanical properties (circumferential stress and strain) assessed with pressure myography. Collagen (Masson's Trichrome) and elastin (Verhoff) were visualized histologically and % positively-stained area was assessed. Median maternal age was 32 years (range 25-34) for younger, and 38 years (range 35-42) for women of advanced maternal age. Circumferential strain was lower in arteries from advanced maternal age versus younger women but circumferential stress was not different. Omental artery collagen levels were similar, while elastin levels were lower with advanced maternal age versus younger pregnancies. The collagen:elastin ratio was greater in arteries from advanced maternal age versus younger women. In conclusion, omental arteries from women of advanced maternal age were less compliant with less elastin compared with arteries of younger controls, which may affect how vascular stressors are tolerated during pregnancy. Understanding how vascular aging affects pregnancy adaptations may contribute to better pregnancy outcomes.
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Affiliation(s)
- Amy L. Wooldridge
- Department of Obstetrics and Gynecology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
- Women and Children’s Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Christy Chan
- Department of Obstetrics and Gynecology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
- Women and Children’s Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Floor Spaans
- Department of Obstetrics and Gynecology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
- Women and Children’s Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Anita Quon
- Department of Obstetrics and Gynecology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
- Women and Children’s Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Craig D. Steinback
- Women and Children’s Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
- Faculty of Kinesiology, Sport, and Recreation, University of Alberta, Edmonton, Alberta, Canada
| | - Margie H. Davenport
- Women and Children’s Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
- Faculty of Kinesiology, Sport, and Recreation, University of Alberta, Edmonton, Alberta, Canada
| | - Sandra T. Davidge
- Department of Obstetrics and Gynecology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
- Women and Children’s Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
- Department of Physiology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Christy-Lynn M. Cooke
- Department of Obstetrics and Gynecology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
- Women and Children’s Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
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Hula N, Kirschenman R, Quon A, Spaans F, Phillips TJ, Case CP, Cooke CLM, Davidge ST. Placenta-targeted treatment with nMitoQ prevents an endothelin receptor A pathway cardiac phenotype observed in adult male offspring exposed to hypoxia in utero. Am J Physiol Heart Circ Physiol 2023. [PMID: 37235521 DOI: 10.1152/ajpheart.00238.2023] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 05/22/2023] [Indexed: 05/28/2023]
Abstract
Prenatal hypoxia is associated with an enhanced susceptibility to cardiac ischemia/reperfusion (I/R) injury in adult offspring, however the mechanisms remain to be fully investigated. Endothelin-1 (ET-1) is a vasoconstrictor that acts via endothelin A (ETA) and endothelin B (ETB) receptors and is essential in maintaining cardiovascular (CV) function. Prenatal hypoxia alters the ET-1 system in adult offspring possibly contributing to I/R susceptibility. We previously showed that ex vivo application of ETA antagonist ABT-627 during I/R prevented the recovery of cardiac function in prenatal hypoxia-exposed males but not in normoxic males nor normoxic or prenatal hypoxia-exposed females. In this follow-up study we examined whether placenta-targeted treatment with a nanoparticle encapsulated mitochondrial antioxidant (nMitoQ) during hypoxic pregnancies could alleviate this hypoxic phenotype observed in adult male offspring. We used a rat model of prenatal hypoxia where pregnant Sprague-Dawley rats were exposed to hypoxia (11% O2) from gestational days (GD) 15-21 after injection with 100μL saline or nMitoQ (125 μM) on GD 15. Male offspring were aged to 4 months and ex vivo cardiac recovery from I/R was assessed. Offspring born from hypoxic pregnancies treated with nMitoQ had increased cardiac recovery from I/R in the presence of ABT-627 compared to their untreated counterparts where ABT-627 prevented recovery. Cardiac ETA levels were increased in males born from hypoxic pregnancies with nMitoQ treatment compared to saline controls (Western blotting). Our data indicate a profound impact of placenta-targeted treatment to prevent an ETA receptor cardiac phenotype observed in adult male offspring exposed to hypoxia in utero.
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Affiliation(s)
- Nataliia Hula
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Raven Kirschenman
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Anita Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Floor Spaans
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Tom J Phillips
- Dementia Research Institute, Cardiff University, Cardiff, United Kingdom
| | - C Patrick Case
- Musculoskeletal Research Unit, University of Bristol, Bristol, United Kingdom
| | - Christy-Lynn M Cooke
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Sandra T Davidge
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
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5
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Sáez T, Pageé A, Kirschenman R, Quon A, Spaans F, Davidge ST. A High Cholesterol Diet During Late Pregnancy Impairs Long-Term Maternal Vascular Function in Mice. Arterioscler Thromb Vasc Biol 2023; 43:120-132. [PMID: 36353990 DOI: 10.1161/atvbaha.122.318421] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND Gestational dyslipidemia is associated with pregnancy complications including preeclampsia. However, whether gestational dyslipidemia leads postpartum vascular dysfunction, which could increase the risk for cardiovascular complications later in life, is not known. Here, we aimed to determine whether a gestational dyslipidemia affects postpartum vascular health and induces early signs of atherosclerosis. METHODS Pregnant C57BL/6 mice received a high cholesterol diet or control diet from gestational day 13.5 until term. After delivery, all mice received the control diet for ≈3 months postpartum (PP). Age-matched nulliparous females were on the same diets for equal periods. After 3 months, all mice were euthanized, serum was collected, and aortas were isolated to assess vascular function (wire myography) and markers of oxidative stress and early atherosclerosis. RESULTS PP-high cholesterol diet females had increased circulating cholesterol levels compared with PP-control diet mice, without effect of the diet in nulliparous mice. Methacholine-induced vasodilation was impaired, and nitric oxide contribution reduced, by the high cholesterol diet in aortas of PP mice, but not in nulliparous mice. Exposure to oxidized low-density-protein cholesterol further impaired methylcholine-induced vasodilation in PP-high cholesterol diet aortas only. Compared with PP-control diet mice, aortic inducible nitric oxide synthase expression, reactive oxygen species and nitrotyrosine levels were increased in aortas from PP-high cholesterol diet mice. No differences in aortic lipid deposition and macrophage infiltration were found. CONCLUSIONS Exposure to a high cholesterol diet in pregnancy impairs vascular function postpartum. Our results support the hypothesis that gestational dyslipidemia impacts maternal vascular function after pregnancy, which could potentially predispose these women to future cardiovascular complications.
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Affiliation(s)
- Tamara Sáez
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada (T.S., R.K., A.Q., F.S., S.T.D.).,Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada (T.S., R.K., A.Q., F.S., S.T.D.)
| | - Abbey Pageé
- Department of Physiology, University of Alberta, Edmonton, Canada (A.P., S.T.D.)
| | - Raven Kirschenman
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada (T.S., R.K., A.Q., F.S., S.T.D.).,Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada (T.S., R.K., A.Q., F.S., S.T.D.)
| | - Anita Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada (T.S., R.K., A.Q., F.S., S.T.D.).,Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada (T.S., R.K., A.Q., F.S., S.T.D.)
| | - Floor Spaans
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada (T.S., R.K., A.Q., F.S., S.T.D.).,Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada (T.S., R.K., A.Q., F.S., S.T.D.)
| | - Sandra T Davidge
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada (T.S., R.K., A.Q., F.S., S.T.D.).,Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada (T.S., R.K., A.Q., F.S., S.T.D.).,Department of Physiology, University of Alberta, Edmonton, Canada (A.P., S.T.D.)
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Tong W, Ganguly E, Villalobos-Labra R, Quon A, Spaans F, Giussani DA, Davidge ST. Sex-Specific Differences in the Placental Unfolded Protein Response in a Rodent Model of Gestational Hypoxia. Reprod Sci 2022; 30:1994-1997. [PMID: 36574145 DOI: 10.1007/s43032-022-01157-w] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Accepted: 12/19/2022] [Indexed: 12/28/2022]
Abstract
Gestational hypoxia is a major contributor to fetal growth restriction (FGR) and perinatal morbidity and mortality and has been closely linked to the activation of the unfolded protein response (UPR) in the placenta. Recent studies on adverse pregnancy conditions show differential adaptive responses in pregnancies carrying male or female fetuses. Here, we use an established rat model of hypoxic pregnancy and FGR to test the hypothesis that chronic hypoxia promotes sexually dimorphic activation of the placental UPR. Our data showed that gestational hypoxia increased glucose regulatory protein 78 (GRP78) expression in male placentae, increased activating transcription factor 6 activation (ATF6) in female placentae, and did not induce changes in other UPR markers. In addition, gestational hypoxia reduced fetal weight only in males and ATF6 activation correlated with an increase in the fetal crown-rump-length/body weight ratio only in females. These results suggest sex-specific divergence in the placental adaptive response to gestational hypoxia, which may account for the sexual dimorphism observed in placental function and pregnancy outcomes in complicated pregnancies.
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Affiliation(s)
- Wen Tong
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK
- Centre for Trophoblast Research, University of Cambridge, Cambridge, UK
| | - Esha Ganguly
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, Alberta, Canada
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Roberto Villalobos-Labra
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Anita Quon
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Floor Spaans
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Dino A Giussani
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK
- Centre for Trophoblast Research, University of Cambridge, Cambridge, UK
| | - Sandra T Davidge
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, Alberta, Canada.
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada.
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada.
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Hula N, Pasha M, Quon A, Kirschenman R, Cooke CM, Spaans F, Davidge ST. Prenatal Hypoxia is Associated with Coronary Artery Endothelial Dysfunction in Male and Female Offspring. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r4175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Anita Quon
- Obstetrics and GynecologyUniversity of AlbertaEdmontonAB
| | | | | | - Floor Spaans
- Obstetrics and GynecologyUniversity of AlbertaEdmontonAB
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8
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Hula N, Vu J, Quon A, Kirschenman R, Spaans F, Liu R, Cooke CLM, Davidge ST. Sex-Specific Effects of Prenatal Hypoxia on the Cardiac Endothelin System in Adult Offspring. Am J Physiol Heart Circ Physiol 2022; 322:H442-H450. [PMID: 35119336 DOI: 10.1152/ajpheart.00636.2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Fetal hypoxia, a major consequence of complicated pregnancies, impairs offspring cardiac tolerance to ischemia/reperfusion (I/R) insult, however, the mechanisms remain unknown. Endothelin-1 (ET-1) signaling through the endothelin A receptors (ETA) is associated with cardiac dysfunction. We hypothesized that prenatal hypoxia exacerbates cardiac susceptibility to I/R via increased ET-1 and ETA levels, while ETA inhibition ameliorates this. Pregnant Sprague-Dawley rats were exposed to normoxia (21% O2) or hypoxia (11% O2) on gestational days 15-21. Offspring were aged to 4 months, and hearts were aerobically perfused or subjected to ex vivo I/R, with or without pre-infusion with an ETA antagonist (ABT-627). ET-1 levels were assessed with ELISA in aerobically perfused and post-I/R left ventricles (LV). ETA and ETB levels were assessed by Western blotting in non-perfused LV. As hypothesized, ABT-627 infusion tended to improve post-I/R recovery in hypoxic females (p=0.0528), however, surprisingly, ABT-627 prevented post-I/R recovery only in the hypoxic males (p<0.001). ET-1 levels were increased in post-I/R LV in both sexes regardless of the prenatal exposure (p<0.01). ETA expression was similar among all groups, while ETB (isoform C) levels were decreased in prenatally hypoxic females (p<0.05). In prenatally hypoxic males, ETA signaling may be essential for tolerance to I/R, while in prenatally hypoxic females, ETA may contribute to cardiac dysfunction. Our data illustrate that understanding the prenatal history has critical implications for treatment strategies in adult chronic diseases.
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Affiliation(s)
- Nataliia Hula
- Department of Physiology, University of Alberta, Edmonton, Canada.,Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Jennie Vu
- Department of Physiology, University of Alberta, Edmonton, Canada
| | - Anita Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Raven Kirschenman
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Floor Spaans
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Ricky Liu
- Department of Physiology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Christy-Lynn M Cooke
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
| | - Sandra T Davidge
- Department of Physiology, University of Alberta, Edmonton, Canada.,Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, AB, Canada
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Sáez T, Wiley C, Quon A, Spaans F, Davidge ST. Increased oxidative stress and endothelial activation in umbilical veins from pregnancies diagnosed with preeclampsia. Pregnancy Hypertens 2021; 26:87-90. [PMID: 34628140 DOI: 10.1016/j.preghy.2021.09.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 06/17/2021] [Revised: 09/17/2021] [Accepted: 09/20/2021] [Indexed: 10/20/2022]
Abstract
Vascular dysfunction is a hallmark of cardiovascular disease (CVD). Offspring from preeclamptic pregnancies are at risk of CVD later in life. Whether fetal vasculature from preeclamptic pregnancies displays signs of vascular dysfunction (i.e., oxidative/nitrosative stress, endothelial activation) associated with increased expression of lectin-like oxidized LDL receptor-1 (LOX-1) and angiotensin-II type-1 receptor (AT1) is unknown. We demonstrated increased superoxide, nitrotyrosine and ICAM-1 levels in umbilical vein tissues of preeclamptic vs. normal pregnancies; without changes in LOX-1 and AT1 levels. Our findings suggest that the fetal vasculature may be impacted in preeclampsia, which could contribute to an increased risk of offspring CVD.
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Affiliation(s)
- Tamara Sáez
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada; Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Camille Wiley
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada; Department of Physiology, University of Alberta, Edmonton, Canada
| | - Anita Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada; Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Floor Spaans
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada; Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Sandra T Davidge
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada; Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada; Department of Physiology, University of Alberta, Edmonton, Canada.
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10
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Villalobos-Labra R, Spaans F, Sáez T, Quon A, Cooke CL, Davidge ST. P-058. A comparison of the effects of placenta-derived extracellular vesicles from preeclamptic and uncomplicated pregnancies on endothelial-dependent vascular function. Pregnancy Hypertens 2021. [DOI: 10.1016/j.preghy.2021.07.093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Hula N, Vu J, Quon A, Kirschenman R, Spaans F, Liu R, Cooke C, Davidge S. Sex‐Specific Role of Endothelin‐A Receptors in the Cardiac Susceptibility to Ischemia/Reperfusion Insult in Adult Offspring Exposed to Prenatal Hypoxia. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.02615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Hula N, Spaans F, Vu J, Quon A, Kirschenman R, Cooke CLM, Phillips TJ, Case CP, Davidge ST. Placental treatment improves cardiac tolerance to ischemia/reperfusion insult in adult male and female offspring exposed to prenatal hypoxia. Pharmacol Res 2021; 165:105461. [PMID: 33513355 DOI: 10.1016/j.phrs.2021.105461] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 01/08/2021] [Accepted: 01/21/2021] [Indexed: 12/12/2022]
Abstract
Offspring born from complicated pregnancies are at greater risk of cardiovascular disease in adulthood. Prenatal hypoxia is a common pregnancy complication that results in placental oxidative stress and impairs fetal development. Adult offspring exposed to hypoxia during fetal life are more susceptible to develop cardiac dysfunction, and show decreased cardiac tolerance to an ischemia/reperfusion (I/R) insult. To improve offspring cardiac outcomes, we have assessed the use of a placenta-targeted intervention during hypoxic pregnancies, by encapsulating the mitochondrial antioxidant MitoQ into nanoparticles (nMitoQ). We hypothesized that maternal nMitoQ treatment during hypoxic pregnancies improves cardiac tolerance to I/R insult in adult male and female offspring. Pregnant Sprague-Dawley rats were exposed to normoxia (21 % O2) or hypoxia (11 % O2) from gestational day 15-20, after injection with 100 μL saline or nMitoQ (125 μM) on GD15 (n=6-8/group). Male and female offspring were aged to 4 months. Both male and female offspring from hypoxic pregnancies showed reduced cardiac tolerance to I/R (assessed ex vivo using the isolated working heart technique) which was ameliorated by nMitoQ treatment. To identify potential molecular mechanisms for the changes in cardiac tolerance to I/R, cardiac levels/phosphorylation of proteins important for intracellular Ca2+ cycling were assessed with Western blotting. In prenatally hypoxic male offspring, improved cardiac recovery from I/R by nMitoQ was accompanied by increased cardiac phospholamban and phosphatase 2Ce levels, and a trend to decreased Ca2+/calmodulin-dependent protein kinase IIδ phosphorylation. In contrast, in female offspring, nMitoQ treatment in hypoxic pregnancies increased phospholamban and protein kinase Cε phosphorylation. Maternal nMitoQ treatment improves cardiac tolerance to I/R insult in adult offspring and thus has the potential to improve the later-life trajectory of cardiovascular health of adult offspring born from pregnancies complicated by prenatal hypoxia.
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Affiliation(s)
- Nataliia Hula
- Department of Physiology, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada; Department of Obstetrics and Gynecology, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada; Women and Children's Health Research Institute, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada.
| | - Floor Spaans
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada; Women and Children's Health Research Institute, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada.
| | - Jennie Vu
- Department of Physiology, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada.
| | - Anita Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada; Women and Children's Health Research Institute, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada.
| | - Raven Kirschenman
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada; Women and Children's Health Research Institute, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada.
| | - Christy-Lynn M Cooke
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada; Women and Children's Health Research Institute, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada.
| | - Tom J Phillips
- Dementia Research Institute, Cardiff University, Cardiff, CF10 3AT, UK.
| | - C Patrick Case
- Musculoskeletal Research Unit, University of Bristol, Bristol, BS10 5NB, UK.
| | - Sandra T Davidge
- Department of Physiology, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada; Department of Obstetrics and Gynecology, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada; Women and Children's Health Research Institute, University of Alberta, Edmonton, T6G 2S2, Alberta, Canada.
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13
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Spaans F, Quon A, Kirschenman R, Morton JS, Sawamura T, Tannetta DS, Sargent IL, Davidge ST. Role of Lectin-like Oxidized LDL Receptor-1 and Syncytiotrophoblast Extracellular Vesicles in the Vascular Reactivity of Mouse Uterine Arteries During Pregnancy. Sci Rep 2020; 10:6046. [PMID: 32269313 PMCID: PMC7142154 DOI: 10.1038/s41598-020-63205-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 03/14/2020] [Indexed: 02/07/2023] Open
Abstract
Vascular complications in pregnancy (e.g. preeclampsia) are a major source of maternal and foetal morbidity and mortality, and may be due to excessive release of placental syncytiotrophoblast-derived extracellular vesicles (STBEVs) into the maternal circulation. Increased activity of the multi-ligand scavenger receptor Lectin-like Oxidized LDL Receptor-1 (LOX-1) is associated with vascular dysfunction, and LOX-1 has been shown to interact with angiotensin II receptor type 1 (AT1). We hypothesized that STBEVs contribute to vascular dysfunction via LOX-1 and AT1 receptors during pregnancy. Uterine arteries from late pregnant wildtype and LOX-1 overexpressing mice were incubated overnight with or without STBEVs and vascular function was assessed using wire myography. STBEV-incubation decreased angiotensin II responsiveness only in wildtype mice, which coincided with decreased AT1 contribution and expression. Thus, STBEVs reduced angiotensin II responsiveness in normal pregnancy, but not in conditions of increased LOX-1 expression, suggesting that STBEVs (via LOX-1) play a role in normal adaptations to pregnancy. Oxidized LDL (a LOX-1 ligand) increased angiotensin II-induced vasoconstriction in STBEV-incubated arteries from both mouse strains, suggesting that the LOX-1 pathway may be involved in complicated pregnancies with elevated STBEVs and oxidized LDL levels (such as preeclampsia). These data increase our understanding of vascular complications during pregnancy.
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Affiliation(s)
- Floor Spaans
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Anita Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Raven Kirschenman
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Jude S Morton
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada
| | - Tatsuya Sawamura
- Department of Molecular Pathophysiology, Shinshu University School of Medicine, Matsumoto, Japan.,Department of Life Innovation, Institute for Biomedical Sciences, Shinshu University, Matsumoto, Japan
| | | | - Ian L Sargent
- Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Oxford, UK
| | - Sandra T Davidge
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Canada. .,Department of Physiology, University of Alberta, Edmonton, Canada. .,Women and Children's Health Research Institute, University of Alberta, Edmonton, Canada.
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14
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Morton JS, Levasseur J, Ganguly E, Quon A, Kirschenman R, Dyck JRB, Fraser GM, Davidge ST. Characterisation of the Selective Reduced Uteroplacental Perfusion (sRUPP) Model of Preeclampsia. Sci Rep 2019; 9:9565. [PMID: 31266978 PMCID: PMC6606748 DOI: 10.1038/s41598-019-45959-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 06/20/2019] [Indexed: 12/03/2022] Open
Abstract
Preeclampsia is a complication of pregnancy characterised by gestational hypertension, proteinuria and/or end organ disease. The reduced uteroplacental perfusion (RUPP) model, via partial occlusion of the lower abdominal aorta, mimics insufficient placental perfusion as a primary causal characteristic of preeclampsia. However, a major limitation of the RUPP model is that perfusion is reduced to the entire hindquarters of the rat resulting in hindlimb ischemia. We hypothesised that clipping the uterine and ovarian arteries in the selective (s)RUPP model would provoke signs of preeclampsia while avoiding systemic ischemia. Sham, RUPP or sRUPP procedures were performed in pregnant Sprague Dawley rats on gestational day (GD)14. On GD21 uterine blood flow was significantly reduced in both the RUPP and sRUPP models while aortic flow was reduced only in RUPP. Both models resulted in increased MAP, increased vascular oxidative stress (superoxide generation), increased pro-inflammatory (RANTES) and reduced pro-angiogenic (endoglin) mediators. Vascular compliance and constriction were unaltered in either RUPP or sRUPP groups. In summary, refinements to the RUPP model simultaneously maintain the characteristic phenotype of preeclampsia and avoid peripheral ischemia; providing a useful tool which may be used to increase our knowledge and bring us closer to a solution for women affected by preeclampsia.
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Affiliation(s)
- J S Morton
- Faculty of Medicine and Dentistry, Dept. of Ob/Gyn, University of Alberta, Edmonton, AB, T6G 2S2, Canada.,Women and Children's Health Research Institute, Edmonton, AB, T6G 2R3, Canada
| | - J Levasseur
- Faculty of Medicine and Dentistry, Dept. of Pediatrics, University of Alberta, Edmonton, AB, T6G 2S2, Canada
| | - E Ganguly
- Faculty of Medicine and Dentistry, Dept. of Ob/Gyn, University of Alberta, Edmonton, AB, T6G 2S2, Canada.,Faculty of Medicine and Dentistry, Dept. of Physiology, University of Alberta, Edmonton, AB, T6G 2H7, Canada.,Women and Children's Health Research Institute, Edmonton, AB, T6G 2R3, Canada
| | - A Quon
- Faculty of Medicine and Dentistry, Dept. of Ob/Gyn, University of Alberta, Edmonton, AB, T6G 2S2, Canada.,Women and Children's Health Research Institute, Edmonton, AB, T6G 2R3, Canada
| | - R Kirschenman
- Faculty of Medicine and Dentistry, Dept. of Ob/Gyn, University of Alberta, Edmonton, AB, T6G 2S2, Canada.,Women and Children's Health Research Institute, Edmonton, AB, T6G 2R3, Canada
| | - J R B Dyck
- Faculty of Medicine and Dentistry, Dept. of Pediatrics, University of Alberta, Edmonton, AB, T6G 2S2, Canada
| | - G M Fraser
- Division of Biomedical Sciences, Faculty of Medicine, Memorial University of Newfoundland, St. John's, NL, A1B 3V6, Canada
| | - S T Davidge
- Faculty of Medicine and Dentistry, Dept. of Ob/Gyn, University of Alberta, Edmonton, AB, T6G 2S2, Canada. .,Faculty of Medicine and Dentistry, Dept. of Physiology, University of Alberta, Edmonton, AB, T6G 2H7, Canada. .,Women and Children's Health Research Institute, Edmonton, AB, T6G 2R3, Canada.
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15
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Shah A, Quon A, Morton JS, Davidge ST. Postnatal resveratrol supplementation improves cardiovascular function in male and female intrauterine growth restricted offspring. Physiol Rep 2017; 5:5/2/e13109. [PMID: 28108646 PMCID: PMC5269411 DOI: 10.14814/phy2.13109] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [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: 12/08/2016] [Accepted: 12/09/2016] [Indexed: 12/18/2022] Open
Abstract
Intrauterine growth restriction (IUGR) may predispose offspring to an increased susceptibility of developing cardiovascular disease (CVD) in adult life. The window of opportunity to treat later life CVD programmed in fetal life is critical. The aim of this study was to identify the effect of resveratrol treatment of IUGR offspring at a time of known CV dysfunction. Sprague–Dawley male and female rat offspring who experienced normoxia (21% O2; control) or hypoxia (11% O2; IUGR) in utero were fed a high‐fat (HF) diet (3–21 weeks of age) or a HF diet (3–21 weeks of age) supplemented with resveratrol from 13 to 21 weeks of age. At 21 weeks of age, echocardiographic data showed that male IUGR offspring had mild in vivo diastolic dysfunction, whereas female IUGR offspring had early signs of cardiac diastolic dysfunction that was not altered by resveratrol treatment. Notably, male and female IUGR offspring demonstrated equal susceptibility to ex vivo cardiac dysfunction recovery after ischemia/reperfusion (I/R) injury and this was improved by resveratrol treatment, independent of sex. Resveratrol increased cardiac phospho‐adenosine monophosphate kinase (p‐AMPK) levels in only female IUGR offspring. IUGR or resveratrol did not alter cardiac superoxide levels. However, in male offspring, an overall effect of IUGR in reducing cardiac catalase levels was observed that was not altered by resveratrol. Interestingly, in only female IUGR offspring, resveratrol significantly increased cardiac superoxide dismutase (SOD) 2 levels. In conclusion, resveratrol treatment of adult IUGR offspring, at the time of known CV dysfunction, improved cardiac function recovery in both sexes and the mechanisms involved were partially sex‐specific.
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Affiliation(s)
- Amin Shah
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Anita Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Jude S Morton
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada.,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Sandra T Davidge
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada .,Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada.,Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
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16
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Brennan L, Morton JS, Quon A, Davidge ST. Postpartum Vascular Dysfunction in the Reduced Uteroplacental Perfusion Model of Preeclampsia. PLoS One 2016; 11:e0162487. [PMID: 27658290 PMCID: PMC5033327 DOI: 10.1371/journal.pone.0162487] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 08/23/2016] [Indexed: 11/18/2022] Open
Abstract
Preeclampsia is a disorder affecting 2–8% of all pregnancies, characterized by gestational hypertension (≥ 140/90 mmHg) and proteinuria (≥300 mg over 24 hours) diagnosed following the 20th week of pregnancy, and for which there is currently no available treatment. While the precise cause of preeclampsia is unknown, placental ischemia/hypoxia resulting from abnormal trophoblast invasion and maternal endothelial dysfunction are central characteristics. Preeclampsia is a major cause of both maternal and fetal morbidity and mortality in the perinatal period. In addition, women who have experienced preeclampsia are more likely to suffer cardiovascular disease later in life. The cause of this elevation in cardiovascular risk postpartum, however, is unknown. We hypothesize that there may be lasting vascular dysfunction following exposure to reduced uteroplacental perfusion during pregnancy that may contribute to increased cardiovascular risk postpartum. Using the rat reduced utero-placental perfusion pressure (RUPP) model of preeclampsia, blood pressure was assessed in dams at gestational day 20, one and three months postpartum. Mesenteric artery and aortic function were assessed using wire myography. We demonstrated hypertension and increased mesenteric artery responses to phenylephrine at gestational day 20, with the latter due to a decreased contribution of nitric oxide without any change in methylcholine-induced relaxation. At one month postpartum, we demonstrated a small but significant vasoconstrictive phenotype that was due to an underlying loss of basal nitric oxide contribution. At three months postpartum, endothelium-dependent relaxation of the aorta demonstrated sensitivity to oxLDL and mesenteric arteries demonstrated decreased nitric oxide bioavailability with impaired methylcholine-induced relaxation; indicative of an early development of endothelial dysfunction. In summary, we have demonstrated impaired vascular function following exposure to a RUPP pregnancy that continued into the postpartum period; suggesting that a pregnancy complicated by preeclampsia may predispose women to later life cardiovascular disease via ongoing vascular dysfunction.
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Affiliation(s)
- Lesley Brennan
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, T6G 2S2, Canada
- Women and Children's Health Research Institute, Edmonton, T6G 2R3, Canada
| | - Jude S. Morton
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, T6G 2S2, Canada
- Women and Children's Health Research Institute, Edmonton, T6G 2R3, Canada
| | - Anita Quon
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, T6G 2S2, Canada
- Women and Children's Health Research Institute, Edmonton, T6G 2R3, Canada
| | - Sandra T. Davidge
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, T6G 2S2, Canada
- Department of Physiology, University of Alberta, Edmonton, T6G 2H7, Canada
- Women and Children's Health Research Institute, Edmonton, T6G 2R3, Canada
- * E-mail:
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Reyes LM, Kirschenman R, Quon A, Morton JS, Shah A, Davidge ST. Aerobic exercise training reduces cardiac function in adult male offspring exposed to prenatal hypoxia. Am J Physiol Regul Integr Comp Physiol 2015; 309:R489-98. [DOI: 10.1152/ajpregu.00201.2015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 07/03/2015] [Indexed: 12/19/2022]
Abstract
Intrauterine growth restriction (IUGR) has been associated with increased susceptibility to myocardial ischemia-reperfusion (I/R) injury. Exercise is an effective preventive intervention for cardiovascular diseases; however, it may be detrimental in conditions of compromised health. The aim of this study was to determine whether exercise training can improve cardiac performance after I/R injury in IUGR offspring. We used a hypoxia-induced IUGR model by exposing pregnant Sprague-Dawley rats to 21% oxygen (control) or hypoxic (11% oxygen; IUGR) conditions from gestational day 15 to 21. At 10 wk of age, offspring were randomized to a sedentary group or to a 6-wk exercise protocol. Transthoracic echocardiography assessments were performed after 6 wk. Twenty-four hours after the last bout of exercise, ex vivo cardiac function was determined using a working heart preparation. With exercise training, there was improved baseline cardiac performance in male control offspring but a reduced baseline cardiac performance in male IUGR exercised offspring ( P < 0.05). In male offspring, exercise decreased superoxide generation in control offspring, while in IUGR offspring, it had the polar opposite effect (interaction P ≤ 0.05). There was no effect of IUGR or exercise on cardiac function in female offspring. In conclusion, in male IUGR offspring, exercise may be a secondary stressor on cardiac function. A reduction in cardiac performance along with an increase in superoxide production in response to exercise was observed in this susceptible group.
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Affiliation(s)
- Laura M. Reyes
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada; and
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Raven Kirschenman
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada; and
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Anita Quon
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada; and
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Jude S. Morton
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada; and
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Amin Shah
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada; and
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Sandra T. Davidge
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada; and
- Women and Children's Health Research Institute, University of Alberta, Edmonton, Alberta, Canada
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18
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Morton JS, Quon A, Cheung PY, Sawamura T, Davidge ST. Effect of sodium tanshinone IIA sulfonate treatment in a rat model of preeclampsia. Am J Physiol Regul Integr Comp Physiol 2014; 308:R163-72. [PMID: 25477421 DOI: 10.1152/ajpregu.00222.2014] [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] [Indexed: 01/23/2023]
Abstract
Preeclampsia is a disorder of pregnancy with a significant impact on maternal and fetal health. The complexity of this multifactorial condition has precluded development of effective therapies and, although many potential pathways have been investigated, the etiology still requires clarification. Our group has investigated the scavenger lectin-like oxidized LDL (LOX-1) receptor, which may respond to factors released from the distressed placenta that contribute to the vascular pathologies observed in preeclampsia. Given the known beneficial effects of sodium tanshinone IIA sulfonate (STS; a component of Salvia miltiorrhiza) on vasodilation, reduction of oxidative stress, and lipid profiles, we have investigated its role as a potential treatment strategy. We hypothesized that STS would improve vascular endothelial function and, combined with a reduction in oxidative stress, would improve pregnancy outcomes in a rat model of preeclampsia (reduced uteroplacental perfusion pressure, RUPP). We further hypothesized this may occur via the action of STS on the LOX-1 and/or platelet-activating factor (PAF) receptor axes. The RUPP model increased maternal blood pressure, vascular oxidative stress, and involvement of the vascular PAF receptor. Treatment with STS during pregnancy decreased both oxidative stress and involvement of the PAF receptor; however, it also increased involvement of the LOX-1 receptor, which is in line with the concept that scavenger receptors, such as LOX-1 and PAF, are upregulated in response to ligand binding and/or under pathological conditions. In this model of preeclampsia, however, the vascular actions of STS did not lead to improvements in pregnancy outcome such as fetal biometrics or maternal blood pressure.
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Affiliation(s)
- Jude S Morton
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, Canada; Women and Children's Health Research Institute and the Cardiovascular Research Centre, Edmonton, Canada
| | - Anita Quon
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, Canada; Women and Children's Health Research Institute and the Cardiovascular Research Centre, Edmonton, Canada
| | - Po-Yin Cheung
- Women and Children's Health Research Institute and the Cardiovascular Research Centre, Edmonton, Canada; Department of Pediatrics, University of Alberta, Edmonton, Canada
| | - Tatsuya Sawamura
- Department of Vascular Physiology, National Cerebral and Cardiovascular Centre Research Institute, Suita, Osaka, Japan; and
| | - Sandra T Davidge
- Department of Obstetrics and Gynaecology, University of Alberta, Edmonton, Canada; Women and Children's Health Research Institute and the Cardiovascular Research Centre, Edmonton, Canada; Department of Physiology, University of Alberta, Edmonton, Canada
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19
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Sowah D, Brown BF, Quon A, Alvarez BV, Casey JR. Resistance to cardiomyocyte hypertrophy in ae3-/- mice, deficient in the AE3 Cl-/HCO3- exchanger. BMC Cardiovasc Disord 2014; 14:89. [PMID: 25047106 PMCID: PMC4120010 DOI: 10.1186/1471-2261-14-89] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 07/16/2014] [Indexed: 12/21/2022] Open
Abstract
Background Cardiac hypertrophy is central to the etiology of heart failure. Understanding the molecular pathways promoting cardiac hypertrophy may identify new targets for therapeutic intervention. Sodium-proton exchanger (NHE1) activity and expression levels in the heart are elevated in many models of hypertrophy through protein kinase C (PKC)/MAPK/ERK/p90RSK pathway stimulation. Sustained NHE1 activity, however, requires an acid-loading pathway. Evidence suggests that the Cl−/HCO3− exchanger, AE3, provides this acid load. Here we explored the role of AE3 in the hypertrophic growth cascade of cardiomyocytes. Methods AE3-deficient (ae3−/−) mice were compared to wildtype (WT) littermates to examine the role of AE3 protein in the development of cardiomyocyte hypertrophy. Mouse hearts were assessed by echocardiography. As well, responses of cultured cardiomyocytes to hypertrophic stimuli were measured. pH regulation capacity of ae3−/− and WT cardiomyocytes was assessed in cultured cells loaded with the pH-sensitive dye, BCECF-AM. Results ae3−/− mice were indistinguishable from wild type (WT) mice in terms of cardiovascular performance. Stimulation of ae3−/− cardiomyocytes with hypertrophic agonists did not increase cardiac growth or reactivate the fetal gene program. ae3−/− mice are thus protected from pro-hypertrophic stimulation. Steady state intracellular pH (pHi) in ae3−/− cardiomyocytes was not significantly different from WT, but the rate of recovery of pHi from imposed alkalosis was significantly slower in ae3−/− cardiomyocytes. Conclusions These data reveal the importance of AE3-mediated Cl−/HCO3− exchange in cardiovascular pH regulation and the development of cardiomyocyte hypertrophy. Pharmacological antagonism of AE3 is an attractive approach in the treatment of cardiac hypertrophy.
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Affiliation(s)
| | | | | | | | - Joseph R Casey
- Department of Biochemistry and Membrane Protein Disease Research Group, University of Alberta, Edmonton T6G 2H7, Canada.
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Hiniker S, Modlin L, Harris J, Trakul N, Quon A, Maxim P, Graves E, Diehn M, Loo B. Performance of PET in Evaluating Local Recurrence After Stereotactic Ablative Radiation Therapy for Early Lung Cancer. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
Pathological cardiac hypertrophy, the maladaptive remodelling of the myocardium, often progresses to heart failure. The sodium-proton exchanger (NHE1) and chloride-bicarbonate exchanger (AE3) have been implicated as important in the hypertrophic cascade. Carbonic anhydrase II (CAII) provides substrates for these transporters (protons and bicarbonate, respectively). CAII physically interacts with NHE1 and AE3, enhancing their respective ion transport activities by increasing the concentration of substrate at their transport sites. Earlier studies found that a broad-spectrum carbonic anhydrase inhibitor prevented cardiomyocyte hypertrophy (CH), suggesting that carbonic anhydrase is important in the development of hypertrophy. Here we investigated whether cytosolic CAII was the CA isoform involved in hypertrophy. Neonatal rat ventricular myocytes (NRVMs) were transduced with recombinant adenoviral constructs to over-express wild-type or catalytically inactive CAII (CAII-V143Y). Over-expression of wild-type CAII in NRVMs did not affect CH development. In contrast, CAII-V143Y over-expression suppressed the response to hypertrophic stimuli, suggesting that CAII-V143Y behaves in a dominant negative fashion over endogenous CAII to suppress hypertrophy. We also examined CAII-deficient (Car2) mice, whose hearts exhibit physiological hypertrophy without any decrease in cardiac function. Moreover, cardiomyocytes from Car2 mice do not respond to prohypertrophic stimulation. Together, these findings support a role of CAII in promoting CH.
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Affiliation(s)
- Brittany F Brown
- Membrane Protein Disease Research Group, Department of Biochemistry, School of Translational Medicine, University of Alberta, Edmonton, AB, Canada
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Vilas GL, Loganathan SK, Quon A, Sundaresan P, Vithana EN, Casey J. Oligomerization of SLC4A11 protein and the severity of FECD and CHED2 corneal dystrophies caused by SLC4A11 mutations. Hum Mutat 2011; 33:419-28. [PMID: 22072594 DOI: 10.1002/humu.21655] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 10/31/2011] [Indexed: 11/06/2022]
Abstract
Mutations in the SLC4A11 gene, which encodes a plasma membrane borate transporter, cause recessive congenital hereditary endothelial corneal dystrophy type 2 (CHED2), corneal dystrophy and perceptive deafness (Harboyan syndrome), and dominant late-onset Fuchs endothelial corneal dystrophy (FECD). We analyzed missense SLC4A11 mutations identified in FECD and CHED2 patients and expressed in transfected HEK 293 cells. Chemical cross-linking and migration in nondenaturing gels showed that SLC4A11 exists as a dimer. Furthermore, co-immunoprecipitation of epitope-tagged proteins revealed heteromeric interactions between wild-type (WT) and mutant SLC4A11 proteins. When expressed alone, FECD- and CHED2-causing mutant SLC4A11 proteins are primarily retained intracellularly. Co-expression with WT SLC4A11 partially rescued the cell surface trafficking of CHED2 mutants, but not FECD mutants. CHED2 alleles of SLC4A11 did not affect cell surface processing of WT SLC4A11. In contrast, FECD mutants reduced WT cell surface processing efficiency, consistent with dominant inheritance of FECD. The reduction in movement of WT protein to the cell surface caused by FECD SLC4A11 helps to explain the dominant inheritance of this disorder. Similarly, the failure of CHED2 mutant SLC4A11 to affect the processing of WT protein, explains the lack of symptoms found in CHED2 carriers and the recessive inheritance of the disorder.
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Affiliation(s)
- Gonzalo L Vilas
- Membrane Protein Disease Research Group, Department of Physiology, School of Molecular and Systems Medicine, University of Alberta, Edmonton, Canada
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Colevas AD, Quon A, McMillan A, Le Q. Chemoradiation for nasopharyngeal carcinoma (NPC) with pilot hypoxia imaging with F18 misonidazole PET scanning. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.5556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Vilas GL, Morgan PE, Loganathan SK, Quon A, Casey JR. A Biochemical Framework for SLC4A11, the Plasma Membrane Protein Defective in Corneal Dystrophies. Biochemistry 2011; 50:2157-69. [DOI: 10.1021/bi101887z] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Gonzalo L. Vilas
- Membrane Protein Disease Research Group, Department of Physiology, and Department of Biochemistry, School of Molecular and Systems Medicine, University of Alberta, Edmonton, Canada T6G 2H7
| | - Patricio E. Morgan
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina CP1900
| | - Sampath K. Loganathan
- Membrane Protein Disease Research Group, Department of Physiology, and Department of Biochemistry, School of Molecular and Systems Medicine, University of Alberta, Edmonton, Canada T6G 2H7
| | - Anita Quon
- Membrane Protein Disease Research Group, Department of Physiology, and Department of Biochemistry, School of Molecular and Systems Medicine, University of Alberta, Edmonton, Canada T6G 2H7
| | - Joseph R. Casey
- Membrane Protein Disease Research Group, Department of Physiology, and Department of Biochemistry, School of Molecular and Systems Medicine, University of Alberta, Edmonton, Canada T6G 2H7
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Tseng D, Rachakonda L, Su Z, Advani R, Horning S, Rosenberg S, Hoppe R, Quon A, Graves E, Loo B, Tran P. Mid-treatment Metabolic Tumor Volume Predicts Progression and Death among Patients with Hodgkin's Disease. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.1275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Eastham D, Chapman C, Rao A, Narasimhan B, Quon A, Vasanawala M, Wakelee H, Le Q, Colevas A, Loo B. Does Pre-treatment Metabolic Tumor Growth Rate (MTGR) Predict Progression in Lung Cancer? Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.1020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Schellenberg D, Kim J, Columbo LA, Fisher G, Quon A, Desser T, Maxim P, Goodman K, Chang D, Koong A. 62 SINGLE FRACTION STEREOTACTIC BODY RADIATION THERAPY (SBRT) AND SEQUENTIAL GEMCITABINE FOR THE TREATMENT OF LOCALLY ADVANCED PANCREATIC CANCER. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)72449-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Chang D, Schellenberg D, Shen J, Kim J, Goodman K, Fisher G, Ford J, Desser T, Quon A, Koong A. Stereotactic Body Radiotherapy for Unresectable Adenocarcinoma of the Pancreas. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Lee P, Bazan J, Weerasuriya D, Lavori P, Quon A, Le Q, Loo B. Metabolic Tumor Volume Predicts Overall Survival in Lung Cancer Patients Treated Definitively. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.1375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Eastham D, Weerasuriya D, Wakelee H, Quon A, Maxim P, Le Q, Graves E, Loo B. Quantification of Progression of Non-small Cell Lung Cancer in the Interval Between Diagnostic and Radiotherapy Treatment Planning PET Scans. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.1750] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Schellenberg D, Chang S, Quon A, Graves E, Goodman K, Koong A. Using Pre-radiation PET Parameters to Predict Survival in Adenocarcinoma of the Pancreas Treated With Gemcitabine and Single Fraction Stereotactic Body Radiation Therapy. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.1369] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Olson M, Weerasuriya D, Wakelee H, Quon A, Maxim P, Le Q, Graves E, Loo B. Mid-Treatment FDG-PET Predicts Disease Progression in Patients With Non-Small Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.1720] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Quon A, Chang ST, Chin F, Kamaya A, Dick DW, Loo BW, Gambhir SS, Koong AC. Initial evaluation of 18F-fluorothymidine (FLT) PET/CT scanning for primary pancreatic cancer. Eur J Nucl Med Mol Imaging 2007; 35:527-31. [PMID: 17960376 DOI: 10.1007/s00259-007-0630-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2007] [Accepted: 09/28/2007] [Indexed: 12/11/2022]
Abstract
PURPOSE The aim of this study was to evaluate the potential of (18)F-fluorothymidine (FLT) PET/CT for imaging pancreatic adenocarcinoma. METHODS This was a pilot study of five patients (four males, one female) with newly diagnosed and previously untreated pancreatic adenocarcinoma. Patients underwent FLT PET/CT, (18)F-fluorodeoxyglucose (FDG) PET/CT, and contrast-enhanced CT scanning before treatment. The presence of cancer was confirmed by histopathological analysis at the time of scanning in all five patients. The degree of FLT and FDG uptake at the primary tumor site was assessed using visual interpretation and semi-quantitative SUV analyses. RESULTS The primary tumor size ranged from 2.5 x 2.8 cm to 3.5 x 7.0 cm. The SUV of FLT uptake within the primary tumor ranged from 2.1 to 3.1. Using visual interpretation, the primary cancer could be detected from background activity in two of five patients (40%) on FLT PET/CT. By comparison, FDG uptake was higher in each patient with a SUV range of 3.4 to 10.8, and the primary cancer could be detected from background in all five patients (100%). CONCLUSIONS In this pilot study of five patients with primary pancreatic adenocarcinoma, FLT PET/CT scanning showed poor lesion detectability and relatively low levels of radiotracer uptake in the primary tumor.
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Affiliation(s)
- A Quon
- Department of Radiology and Molecular Imaging Program at Stanford, Stanford University Medical Center, 300 Pasteur Drive, Stanford, CA 94305, USA.
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Iagaru A, Quon A, Johnson D, Gambhir SS, McDougall IR. 2-Deoxy-2-[F-18]fluoro-d-glucose Positron Emission Tomography/Computed Tomography in the Management of Melanoma. Mol Imaging Biol 2006; 9:50-7. [PMID: 17051322 DOI: 10.1007/s11307-006-0065-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [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: 10/24/2022]
Abstract
OBJECTIVES 2-Deoxy-2-[F-18]fluoro-D-glucose (FDG)-positron emission tomography (PET)/computed tomography (CT) is widely available as a powerful imaging modality, combining the ability to detect active metabolic processes and their morphologic features in a single exam. The role of FDG-PET is proven in a variety of cancers, including melanoma, but the estimates of sensitivity and specificity are based in the majority of the published studies on dedicated PET, not PET/CT. Therefore, we were prompted to review our experience with FDG-PET/CT in the management of melanoma. METHODS This is a retrospective study on 106 patients with melanoma (20-87 years old; average: 56.8 +/- 15.9), who had whole-body FDG-PET/CT at our institution from January 2003 to June 2005. Thirty-eight patients (35.9%) were women and 68 patients (64.1%) were men. Reinterpretation of the imaging studies for accuracy and data analysis from medical records were performed. RESULTS All patients had the study for disease restaging. The primary tumor depth (Breslow's thickness) at initial diagnosis was available for 76 patients (71.7%) and ranged from 0.4 to 25 mm (average: 3.56 mm). The anatomic level of invasion in the skin (Clark's level) was determined for 70 patients (66%): 3, level II; 13, level III; 43, level IV; 11, level V. The administered dose of (18)F FDG ranged from 9.8 to 21.6 mCi (average: 15.4 +/- 1.8 mCi). FDG-PET/CT had a sensitivity of 89.3% [95% confidence interval (CI): 78.5-95] and a specificity of 88% (95% CI: 76.2-94.4) for melanoma detection. CONCLUSION This study confirms the good results of FDG-PET/CT for residual/recurrent melanoma detection, as well as for distant metastases localization. PET/CT should be an integral part in evaluation of patients with high-risk melanoma, prior to selection of the most appropriate therapy.
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Affiliation(s)
- A Iagaru
- Division of Nuclear Medicine, Department of Radiology, Stanford Hospital and Clinics, Stanford, CA, USA
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Appleyard GD, Forsyth GW, Kiehlbauch LM, Sigfrid KN, Hanik HLJ, Quon A, Loewen ME, Grahn BH. Differential mitochondrial DNA and gene expression in inherited retinal dysplasia in miniature Schnauzer dogs. Invest Ophthalmol Vis Sci 2006; 47:1810-6. [PMID: 16638985 DOI: 10.1167/iovs.05-0819] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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: 11/24/2022] Open
Abstract
PURPOSE To investigate the molecular basis of inherited retinal dysplasia in miniature Schnauzers. METHODS Retina and retinal pigment epithelial tissues were collected from canine subjects at the age of 3 weeks. Total RNA isolated from these tissues was reverse transcribed to make representative cDNA pools that were compared for differences in gene expression by using a subtractive hybridization technique referred to as representational difference analysis (RDA). Expression differences identified by RDA were confirmed and quantified by real-time reverse-transcription PCR. Mitochondrial morphology from leukocytes and skeletal muscle of normal and affected miniature Schnauzers was examined by transmission electron microscopy. RESULTS RDA screening of retinal pigment epithelial cDNA identified differences in mRNA transcript coding for two mitochondrial (mt) proteins--cytochrome oxidase subunit 1 and NADH dehydrogenase subunit 6--in affected dogs. Contrary to expectations, these identified sequences did not contain mutations. Based on the implication of mt-DNA-encoded proteins by the RDA experiments we used real-time PCR to compare the relative amounts of mt-DNA template in white blood cells from normal and affected dogs. White blood cells of affected dogs contained less than 30% of the normal amount of two specific mtDNA sequences, compared with the content of the nuclear-encoded glyceraldehyde-3-phosphate dehydrogenase (GA-3-PDH) reference gene. Retina and RPE tissue from affected dogs had reduced mRNA transcript levels for the two mitochondrial genes detected in the RDA experiment. Transcript levels for another mtDNA-encoded gene as well as the nuclear-encoded mitochondrial Tfam transcription factor were reduced in these tissues in affected dogs. Mitochondria from affected dogs were reduced in number and size and were unusually electron dense. CONCLUSIONS Reduced levels of nuclear and mitochondrial transcripts in the retina and RPE of miniature Schnauzers affected with retinal dysplasia suggest that the pathogenesis of the disorder may arise from a lowered energy supply to the retina and RPE.
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Affiliation(s)
- Greg D Appleyard
- Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada
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Iagaru A, Quon A, McDougall IR, Gambhir SS. Merkel Cell Carcinoma: Is there a Role for 2-Deoxy-2-[F-18]fluoro-d-glucose-Positron Emission Tomography/Computed Tomography? Mol Imaging Biol 2006; 8:212-7. [PMID: 16724293 DOI: 10.1007/s11307-006-0047-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [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: 10/24/2022]
Abstract
PURPOSE 2-Deoxy-2-[F-18]fluoro-D-glucose (FDG)-positron emission tomography (PET)/computed tomography (CT) is becoming widely available as a powerful imaging modality, combining the ability to detect active metabolic processes and their morphologic features in a single study. The role of FDG-PET/CT is proven in lymphoma, melanoma, colorectal carcinoma, and other cancers. However, there are rare malignancies such as Merkel cell carcinoma that can potentially be evaluated with PET/CT. We were therefore prompted to review our experience with FDG-PET/CT in the management of patients with Merkel cell carcinoma. PROCEDURES This is a retrospective case series of six patients with Merkel cell carcinoma, 58-81 years old (average 69 +/- 8.3), who had whole-body PET/CT at our institution from January 1st, 2003 to August 31st, 2005. Two patients were women and four were men. Reinterpretation of the imaging studies for accuracy and data analysis from medical records were performed. RESULTS Twelve examinations were acquired for the six patients (one patient had six PET/CT, one patient had two PET/CT, and four patients had one PET/CT). The injected FDG doses ranged 381.1-669.7 MBq (average 573.5 +/- 70.3). Four patients had the PET/CT as part of initial staging, and two patients had the exam for restaging (after surgery and XRT). A total of six Merkel lesions (pancreas, adrenal, lip, submandibular lymph nodes, cervical lymph nodes, and parapharyngeal soft tissue) were identified in three patients and confirmed on histopathological examination. The FDG uptake in these areas was intense, with maximum standardized uptake value (SUVmax) values of 5-14 (average 10.4 +/- 3.8). In one patient, the PET/CT scan identified abnormal focal distal sigmoid uptake that was biopsied and diagnosed as adenocarcinoma. Two patients had negative scans and had no clinical evidence of disease on follow-up office visits (up to one year after PET/CT). CONCLUSIONS This case series suggests that FDG-PET/CT may have a promising role in the management of patients with Merkel cell carcinoma.
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Affiliation(s)
- A Iagaru
- Division of Nuclear Medicine, Department of Radiology, Stanford University Medical Center, 300 Pasteur Drive, H-0101, Stanford, CA 94305, USA
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Do B, Mari C, Biswal S, Kalinyak J, Quon A, Gambhir SS. Diagnosis of aseptic deep venous thrombosis of the upper extremity in a cancer patient using fluorine-18 fluorodeoxyglucose positron emission tomography/ computerized tomography (FDG PET/CT). Ann Nucl Med 2006; 20:151-5. [PMID: 16615425 DOI: 10.1007/bf02985628] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [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: 10/21/2022]
Abstract
We describe a patient with a history of recurrent squamous cell carcinoma of the tongue and abnormal FDG uptake in the left arm during a re-staging FDG PET/CT. After revision of the patient's clinical history, tests and physical exam, the abnormal FDG uptake was found to correspond to an extensive aseptic deep venous thrombosis of the upper extremity.
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Affiliation(s)
- B Do
- Stanford University Medical Center, Nuclear Medicine Division, Department of Radiology and Molecular Imaging Program at Stanford, USA.
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Lee P, Le Q, Lavori P, Quon A, Graves E, Loo B. Metabolic Tumor Burden Predicts for Disease Progression in Lung Cancer. Int J Radiat Oncol Biol Phys 2005. [DOI: 10.1016/j.ijrobp.2005.07.663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Affiliation(s)
- A. Grow
- Stanford Cancer Ctr, Stanford, CA; Stanford Univ Hosp & Sch of Medicine, Stanford, CA
| | - A. Quon
- Stanford Cancer Ctr, Stanford, CA; Stanford Univ Hosp & Sch of Medicine, Stanford, CA
| | - E. E. Graves
- Stanford Cancer Ctr, Stanford, CA; Stanford Univ Hosp & Sch of Medicine, Stanford, CA
| | - B. W. Loo
- Stanford Cancer Ctr, Stanford, CA; Stanford Univ Hosp & Sch of Medicine, Stanford, CA
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