1
|
Swider-Cios E, Turk E, Levy J, Beeghly M, Vroomen J, van den Heuvel MI. The association of maternal-infant interactive behavior, dyadic frontal alpha asymmetry, and maternal anxiety in a smartphone-adapted still face paradigm. Dev Cogn Neurosci 2024; 66:101352. [PMID: 38310719 PMCID: PMC10847859 DOI: 10.1016/j.dcn.2024.101352] [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: 04/17/2023] [Revised: 07/18/2023] [Accepted: 01/30/2024] [Indexed: 02/06/2024] Open
Abstract
Mother-infant interactions form a strong basis for emotion regulation development in infants. These interactions can be affected by various factors, including maternal postnatal anxiety. Electroencephalography (EEG) hyperscanning allows for simultaneous assessment of mother-infant brain-to-behavior association during stressful events, such as the still-face paradigm (SFP). This study aimed at investigating dyadic interactive behavior and brain-to-behavior association across SFP and identifying neural correlates of mother-infant interactions in the context of maternal postnatal anxiety. We measured frontal alpha asymmetry (FAA), a physiological correlate of emotion regulation and a potential marker of risk for psychopathology. To emulate real-life interactions, EEG and behavioral data were collected from 38 mother-infant dyads during a smartphone-adapted dual-SFP. Although the behavioral data showed a clear still-face effect for the smartphone-adapted SFP, this was not reflected in the infant or maternal FAA. Brain-to-behavior data showed higher infant negative affect being associated with more infant leftward FAA during the still-face episodes. Finally, mothers with higher postnatal anxiety showed more right FAA during the first still-face episode, suggesting negative affectivity and a need to withdraw from the situation. Our results form a baseline for further research assessing the effects of maternal postnatal anxiety on infants' FAA and dyadic interactive behavior.
Collapse
Affiliation(s)
- Edyta Swider-Cios
- Department of Cognitive Neuropsychology, Tilburg University, Warandelaan 2, 5000 LE, Tilburg, the Netherlands
| | - Elise Turk
- Department of Cognitive Neuropsychology, Tilburg University, Warandelaan 2, 5000 LE, Tilburg, the Netherlands; Department of Neonatology, University Medical Center Utrecht, Utrecht University Heidelberglaan 100, 3584 CX, Utrecht, the Netherlands
| | - Jonathan Levy
- Department of Criminology and Gonda Brain Research Center, Bar-Ilan University, Ramat-Gan, 5290002 Israel; Department of Neuroscience and Biomedical Engineering, Aalto University, Rakentajanaukio 2, 02150, Espoo, Finland
| | - Marjorie Beeghly
- Department of Psychology, Wayne State University, 5057 Woodward Ave, Detroit, USA
| | - Jean Vroomen
- Department of Cognitive Neuropsychology, Tilburg University, Warandelaan 2, 5000 LE, Tilburg, the Netherlands
| | - Marion I van den Heuvel
- Department of Cognitive Neuropsychology, Tilburg University, Warandelaan 2, 5000 LE, Tilburg, the Netherlands.
| |
Collapse
|
2
|
Turk E, van den Heuvel MI, Sleurs C, Billiet T, Uyttebroeck A, Sunaert S, Mennes M, Van den Bergh BRH. Maternal anxiety during pregnancy is associated with weaker prefrontal functional connectivity in adult offspring. Brain Imaging Behav 2023; 17:595-607. [PMID: 37380807 PMCID: PMC10733226 DOI: 10.1007/s11682-023-00787-1] [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] [Accepted: 06/18/2023] [Indexed: 06/30/2023]
Abstract
BACKGROUND The connectome, constituting a unique fingerprint of a person's brain, may be influenced by its prenatal environment, potentially affecting later-life resilience and mental health. METHODS We conducted a prospective resting-state functional Magnetic Resonance Imaging study in 28-year-old offspring (N = 49) of mothers whose anxiety was monitored during pregnancy. Two offspring anxiety subgroups were defined: "High anxiety" (n = 13) group versus "low-to-medium anxiety" (n = 36) group, based on maternal self-reported state anxiety at 12-22 weeks of gestation. To predict resting-state functional connectivity of 32 by 32 ROIs, maternal state anxiety during pregnancy was included as a predictor in general linear models for both ROI-to-ROI and graph theoretical metrics. Sex, birth weight and postnatal anxiety were included as covariates. RESULTS Higher maternal anxiety was associated with weaker functional connectivity of medial prefrontal cortex with left inferior frontal gyrus (t = 3.45, pFDR < 0.05). Moreover, network-based statistics (NBS) confirmed our finding and revealed an additional association of weaker connectivity between left lateral prefontal cortex with left somatosensory motor gyrus in the offspring. While our results showed a general pattern of lower functional connectivity in adults prenatally exposed to maternal anxiety, we did not observe significant differences in global brain networks between groups. CONCLUSIONS Weaker (medial) prefrontal cortex functional connectivity in the high anxiety adult offspring group suggests a long-term negative impact of prenatal exposure to high maternal anxiety, extending into adulthood. To prevent mental health problems at population level, universal primary prevention strategies should aim at lowering maternal anxiety during pregnancy.
Collapse
Affiliation(s)
- Elise Turk
- Department of Cognitive Neuropsychology, Tilburg University, Warandelaan 2, 5037AB, Tilburg, The Netherlands.
| | - Marion I van den Heuvel
- Department of Cognitive Neuropsychology, Tilburg University, Warandelaan 2, 5037AB, Tilburg, The Netherlands
| | - Charlotte Sleurs
- Department of Cognitive Neuropsychology, Tilburg University, Warandelaan 2, 5037AB, Tilburg, The Netherlands
- Department of Oncology, Catholic University of Leuven, KU Leuven, Leuven, Belgium
| | | | - Anne Uyttebroeck
- Department of Oncology, Catholic University of Leuven, KU Leuven, Leuven, Belgium
| | | | - Maarten Mennes
- Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Nijmegen, The Netherlands
| | - Bea R H Van den Bergh
- Health Psychology Research Group, Catholic University of Leuven, KU Leuven, Leuven, Belgium
- Department of Welfare, Public Health and Family, Flemish Government, Brussels, Belgium
| |
Collapse
|
3
|
Turk E, Endevelt-Shapira Y, Feldman R, van den Heuvel MI, Levy J. Brains in Sync: Practical Guideline for Parent-Infant EEG During Natural Interaction. Front Psychol 2022; 13:833112. [PMID: 35572249 PMCID: PMC9093685 DOI: 10.3389/fpsyg.2022.833112] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 04/05/2022] [Indexed: 12/14/2022] Open
Abstract
Parent-infant EEG is a novel hyperscanning paradigm to measure social interaction simultaneously in the brains of parents and infants. The number of studies using parent-infant dual-EEG as a theoretical framework to measure brain-to-brain synchrony during interaction is rapidly growing, while the methodology for measuring synchrony is not yet uniform. While adult dual-EEG methodology is quickly improving, open databases, tutorials, and methodological validations for dual-EEG with infants are largely missing. In this practical guide, we provide a step-by-step manual on how to implement and run parent-infant EEG paradigms in a neurodevelopmental laboratory in naturalistic settings (e.g., free interactions). Next, we highlight insights on the variety of choices that can be made during (pre)processing dual-EEG data, including recommendations on interpersonal neural coupling metrics and interpretations of the results. Moreover, we provide an exemplar dataset of two mother-infant dyads during free interactions ("free play") that may serve as practice material. Instead of providing a critical note, we would like to move the field of parent-infant EEG forward and be transparent about the challenges that come along with the exciting opportunity to study the development of our social brain within the naturalistic context of dual-EEG.
Collapse
Affiliation(s)
- Elise Turk
- Department of Cognitive Neuropsychology, Tilburg University, Tilburg, Netherlands
| | - Yaara Endevelt-Shapira
- Baruch Ivcher School of Psychology, Interdisciplinary Center Herzliya, Reichman University, Herzliya, Israel
| | - Ruth Feldman
- Baruch Ivcher School of Psychology, Interdisciplinary Center Herzliya, Reichman University, Herzliya, Israel
| | | | - Jonathan Levy
- Baruch Ivcher School of Psychology, Interdisciplinary Center Herzliya, Reichman University, Herzliya, Israel.,Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland
| |
Collapse
|
4
|
Turk E, Vroomen J, Fonken Y, Levy J, van den Heuvel MI. In sync with your child: The potential of parent-child electroencephalography in developmental research. Dev Psychobiol 2022; 64:e22221. [PMID: 35312051 DOI: 10.1002/dev.22221] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [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: 02/15/2021] [Revised: 09/29/2021] [Accepted: 10/29/2021] [Indexed: 12/25/2022]
Abstract
Healthy interaction between parent and child is foundational for the child's socioemotional development. Recently, an innovative paradigm shift in electroencephalography (EEG) research has enabled the simultaneous measurement of neural activity in caregiver and child. This dual-EEG or hyperscanning approach, termed parent-child dual-EEG, combines the strength of both behavioral observations and EEG methods. In this review, we aim to inform on the potential of dual-EEG in parents and children (0-6 years) for developmental researchers. We first provide a general overview of the dual-EEG technique and continue by reviewing the first empirical work on the emerging field of parent-child dual-EEG, discussing the limited but fascinating findings on parent-child brain-to-behavior and brain-to-brain synchrony. We then continue by providing an overview of dual-EEG analysis techniques, including the technical challenges and solutions one may encounter. We finish by discussing the potential of parent-child dual-EEG for the future of developmental research. The analysis of multiple EEG data is technical and challenging, but when performed well, parent-child EEG may transform the way we understand how caregiver and child connect on a neurobiological level. Importantly, studying objective physiological measures of parent-child interactions could lead to the identification of novel brain-to-brain synchrony markers of interaction quality.
Collapse
Affiliation(s)
- Elise Turk
- Department of Cognitive Neuropsychology, Tilburg University, Tilburg, The Netherlands
| | - Jean Vroomen
- Department of Cognitive Neuropsychology, Tilburg University, Tilburg, The Netherlands
| | - Yvonne Fonken
- Department of Cognitive Neuropsychology, Tilburg University, Tilburg, The Netherlands
| | - Jonathan Levy
- Baruch Ivcher School of Psychology, Interdisciplinary Center Herzliya (IDC), Herzliya, Israel.,Department of Neuroscience and Biomedical Engineering, Aalto University, Aalto, Finland
| | | |
Collapse
|
5
|
Cetin G, Corum O, Corum DD, Atik O, Altan F, Turk E, Tekeli IO, Faki HE, Uney K. Pharmacokinetics of intravenous meloxicam, ketoprofen and tolfenamic acid in chukar partridge ( Alectoris chukar). Br Poult Sci 2021; 63:14-20. [PMID: 34633873 DOI: 10.1080/00071668.2021.1990211] [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] [Indexed: 10/20/2022]
Abstract
1. The aim of this study was to determine the pharmacokinetics of meloxicam (MLX, 1 mg/kg body weight (BW)), ketoprofen (KETO, 2 mg/kg BW), and tolfenamic acid (TA, 2 mg/kg BW) in chukar partridge (Alectoris chukar) following intravenous (IV) administration.2. Twenty-four healthy chukar partridges were randomly divided into three equal groups (n = 8) as MLX, KETO and TA. Plasma concentrations of MLX, KETO and TA were measured using high-performance liquid chromatography-ultraviolet detection and analysed using non-compartmental analysis.3. No adverse effects were determined in chukar partridges after IV administration of MLX, KETO and TA. MLX, KETO and TA were detected in plasma up to 10, 12 and 12 h, respectively. The terminal elimination half-life of MLX, KETO and TA was 1.22, 1.77 and 1.95 h, respectively. MLX, KETO and TA exhibited volumes of distribution at a steady-state of 0.03, 0.23 and 0.41 l/kg BW, respectively. The total plasma clearance of MLX, KETO and TA was 0.02, 0.11 and 0.15 l/h/kg, respectively. The extraction ratios for MLX, KETO and TA were calculated as 0.002, 0.011 and 0.016, respectively.4. MLX, KETO and TA offer treatment in chukar partridges for various conditions with an absence of adverse reactions and properties such as short elimination half-life and low volume of distribution. However, there is a need to establish the safety and adverse effects of repeated administration, pharmacokinetics of other administration routes and pharmacological efficacy of MLX, KETO and TA in chukar partridges.
Collapse
Affiliation(s)
- G Cetin
- Department of Pharmacology, Faculty of Pharmacy, University of Erzincan Binali Yıldırım, Erzincan, Turkey
| | - O Corum
- Departments of Pharmacology and Toxicology, Faculties of Veterinary Medicine, University of Kastamonu, Kastamonu, Turkey
| | - D D Corum
- Departments of Pharmacology and Toxicology, Faculties of Veterinary Medicine, University of Kastamonu, Kastamonu, Turkey
| | - O Atik
- Departments of Pharmacology and Toxicology, Faculties of Veterinary Medicine, University of Afyon Kocatepe, Afyonkarahisar, Turkey
| | - F Altan
- Departments of Pharmacology and Toxicology, Faculties of Veterinary Medicine, University of Dicle, Diyarbakir, Turkey
| | - E Turk
- Departments of Pharmacology and Toxicology, Faculties of Veterinary Medicine, University of Hatay Mustafa Kemal, Hatay, Turkey
| | - I O Tekeli
- Departments of Pharmacology and Toxicology, Faculties of Veterinary Medicine, University of Hatay Mustafa Kemal, Hatay, Turkey
| | - H E Faki
- Departments of Pharmacology and Toxicology, Faculties of Veterinary Medicine, University of Selcuk, Konya, Turkey
| | - K Uney
- Departments of Pharmacology and Toxicology, Faculties of Veterinary Medicine, University of Selcuk, Konya, Turkey
| |
Collapse
|
6
|
Dijkshoorn ABC, Turk E, Hortensius LM, van der Aa NE, Hoebeek FE, Groenendaal F, Benders MJNL, Dudink J. Preterm infants with isolated cerebellar hemorrhage show bilateral cortical alterations at term equivalent age. Sci Rep 2020; 10:5283. [PMID: 32210267 PMCID: PMC7093404 DOI: 10.1038/s41598-020-62078-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 06/12/2019] [Accepted: 03/06/2020] [Indexed: 01/08/2023] Open
Abstract
The cerebellum is connected to numerous regions of the contralateral side of the cerebrum. Motor and cognitive deficits following neonatal cerebellar hemorrhages (CbH) in extremely preterm neonates may be related to remote cortical alterations, following disrupted cerebello-cerebral connectivity as was previously shown within six CbH infants. In this retrospective case series study, we used MRI and advanced surface-based analyses to reconstruct gray matter (GM) changes in cortical thickness and cortical surface area in extremely preterm neonates (median age = 26; range: 24.9-26.7 gestational weeks) with large isolated unilateral CbH (N = 5 patients). Each CbH infant was matched with their own preterm infant cohort (range: 20-36 infants) based on sex and gestational age at birth. On a macro level, our data revealed that the contralateral cerebral hemisphere of CbH neonates did not show less cortical thickness or cortical surface area than their ipsilateral cerebral hemisphere at term. None of the cases differed from their matched cohort groups in average cortical thickness or average cortical surface area in the ipsilateral or contralateral cerebral hemisphere. On a micro (i.e. vertex) level, we established high variability in significant local cortical GM alteration patterns across case-cohort groups, in which the cases showed thicker or bigger volume in some regions, among which the caudal middle frontal gyrus, insula and parahippocampal gyrus, and thinner or less volume in other regions, among which the cuneus, precuneus and supratentorial gyrus. This study highlights that cerebellar injury during postnatal stages may have widespread bilateral influence on the early maturation of cerebral cortical regions, which implicate complex cerebello-cerebral interactions to be present at term birth.
Collapse
Affiliation(s)
- Aicha B C Dijkshoorn
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Elise Turk
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands.,UMC Utrecht Brain Center, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Lisa M Hortensius
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands.,UMC Utrecht Brain Center, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Niek E van der Aa
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands.,UMC Utrecht Brain Center, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Freek E Hoebeek
- UMC Utrecht Brain Center, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands.,Department for Developmental Origins of Disease, Wilhelmina Children's hospital, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Floris Groenendaal
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Manon J N L Benders
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands.,UMC Utrecht Brain Center, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Jeroen Dudink
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands. .,UMC Utrecht Brain Center, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands.
| |
Collapse
|
7
|
Khalili N, Lessmann N, Turk E, Claessens N, Heus RD, Kolk T, Viergever M, Benders M, Išgum I. Automatic brain tissue segmentation in fetal MRI using convolutional neural networks. Magn Reson Imaging 2019; 64:77-89. [DOI: 10.1016/j.mri.2019.05.020] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Revised: 05/04/2019] [Accepted: 05/15/2019] [Indexed: 10/26/2022]
|
8
|
Khalili N, Turk E, Benders MJNL, Moeskops P, Claessens NHP, de Heus R, Franx A, Wagenaar N, Breur JMPJ, Viergever MA, Išgum I. Automatic extraction of the intracranial volume in fetal and neonatal MR scans using convolutional neural networks. Neuroimage Clin 2019; 24:102061. [PMID: 31835284 PMCID: PMC6909142 DOI: 10.1016/j.nicl.2019.102061] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 10/24/2019] [Accepted: 10/26/2019] [Indexed: 01/21/2023]
Abstract
Automatic intracranial volume segmentation. Fetal and neonatal MRI. Deep learning.
MR images of infants and fetuses allow non-invasive analysis of the brain. Quantitative analysis of brain development requires automatic brain tissue segmentation that is typically preceded by segmentation of the intracranial volume (ICV). Fast changes in the size and morphology of the developing brain, motion artifacts, and large variation in the field of view make ICV segmentation a challenging task. We propose an automatic method for segmentation of the ICV in fetal and neonatal MRI scans. The method was developed and tested with a diverse set of scans regarding image acquisition parameters (i.e. field strength, image acquisition plane, image resolution), infant age (23–45 weeks post menstrual age), and pathology (posthaemorrhagic ventricular dilatation, stroke, asphyxia, and Down syndrome). The results demonstrate that the method achieves accurate segmentation with a Dice coefficient (DC) ranging from 0.98 to 0.99 in neonatal and fetal scans regardless of image acquisition parameters or patient characteristics. Hence, the algorithm provides a generic tool for segmentation of the ICV that may be used as a preprocessing step for brain tissue segmentation in fetal and neonatal brain MR scans.
Collapse
Affiliation(s)
- Nadieh Khalili
- Image Sciences Institute, Utrecht University and University Medical Center Utrecht, Utrecht, the Netherlands.
| | - E Turk
- Department of Neonatology, Wilhelmina Childrens Hospital, University Medical Center Utrecht, Utrecht, the Netherlands; Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, the Netherlands
| | - M J N L Benders
- Department of Neonatology, Wilhelmina Childrens Hospital, University Medical Center Utrecht, Utrecht, the Netherlands; Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, the Netherlands
| | - P Moeskops
- Medical Image Analysis, Department of Biomedical Engineering, Eindhoven University of Technology, the Netherlands
| | - N H P Claessens
- Department of Neonatology, Wilhelmina Childrens Hospital, University Medical Center Utrecht, Utrecht, the Netherlands; Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, the Netherlands
| | - R de Heus
- Department of Obstetrics, University Medical Center Utrecht, the Netherlands
| | - A Franx
- Department of Obstetrics, University Medical Center Utrecht, the Netherlands
| | - N Wagenaar
- Department of Neonatology, Wilhelmina Childrens Hospital, University Medical Center Utrecht, Utrecht, the Netherlands; Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, the Netherlands
| | - J M P J Breur
- Department of Neonatology, Wilhelmina Childrens Hospital, University Medical Center Utrecht, Utrecht, the Netherlands; Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, the Netherlands
| | - M A Viergever
- Image Sciences Institute, Utrecht University and University Medical Center Utrecht, Utrecht, the Netherlands; Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, the Netherlands
| | - I Išgum
- Image Sciences Institute, Utrecht University and University Medical Center Utrecht, Utrecht, the Netherlands; Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, the Netherlands
| |
Collapse
|
9
|
Claessens NHP, Khalili N, Isgum I, Ter Heide H, Steenhuis TJ, Turk E, Jansen NJG, de Vries LS, Breur JMPJ, de Heus R, Benders MJNL. Brain and CSF Volumes in Fetuses and Neonates with Antenatal Diagnosis of Critical Congenital Heart Disease: A Longitudinal MRI Study. AJNR Am J Neuroradiol 2019; 40:885-891. [PMID: 30923087 DOI: 10.3174/ajnr.a6021] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2018] [Accepted: 02/27/2019] [Indexed: 12/15/2022]
Abstract
BACKGROUND AND PURPOSE Fetuses and neonates with critical congenital heart disease are at risk of delayed brain development and neurodevelopmental impairments. Our aim was to investigate the association between fetal and neonatal brain volumes and neonatal brain injury in a longitudinally scanned cohort with an antenatal diagnosis of critical congenital heart disease and to relate fetal and neonatal brain volumes to postmenstrual age and type of congenital heart disease. MATERIALS AND METHODS This was a prospective, longitudinal study including 61 neonates with critical congenital heart disease undergoing surgery with cardiopulmonary bypass <30 days after birth and MR imaging of the brain; antenatally (33 weeks postmenstrual age), neonatal preoperatively (first week), and postoperatively (7 days postoperatively). Twenty-six had 3 MR imaging scans; 61 had at least 1 fetal and/or neonatal MR imaging scan. Volumes (cubic centimeters) were calculated for total brain volume, unmyelinated white matter, cortical gray matter, cerebellum, extracerebral CSF, and ventricular CSF. MR images were reviewed for ischemic brain injury. RESULTS Total fetal brain volume, cortical gray matter, and unmyelinated white matter positively correlated with preoperative neonatal total brain volume, cortical gray matter, and unmyelinated white matter (r = 0.5-0.58); fetal ventricular CSF and extracerebral CSF correlated with neonatal ventricular CSF and extracerebral CSF (r = 0.64 and 0.82). Fetal cortical gray matter, unmyelinated white matter, and the cerebellum were negatively correlated with neonatal ischemic injury (r = -0.46 to -0.41); fetal extracerebral CSF and ventricular CSF were positively correlated with neonatal ischemic injury (r = 0.40 and 0.23). Unmyelinated white matter:total brain volume ratio decreased with increasing postmenstrual age, with a parallel increase of cortical gray matter:total brain volume and cerebellum:total brain volume. Fetal ventricular CSF:intracranial volume and extracerebral CSF:intracranial volume ratios decreased with increasing postmenstrual age; however, neonatal ventricular CSF:intracranial volume and extracerebral CSF:intracranial volume ratios increased with postmenstrual age. CONCLUSIONS This study reveals that fetal brain volumes relate to neonatal brain volumes in critical congenital heart disease, with a negative correlation between fetal brain volumes and neonatal ischemic injury. Fetal brain imaging has the potential to provide early neurologic biomarkers.
Collapse
Affiliation(s)
- N H P Claessens
- From the Departments of Neonatology (N.H.P.C., E.T., L.S.d.V., M.J.N.L.B.) .,Pediatric Cardiology (N.H.P.C., H.t.H., T.J.S., J.M.P.J.B.).,Pediatric Intensive Care (N.H.P.C., N.J.G.J.)
| | - N Khalili
- Image Sciences Institute (N.K., I.I.), University Medical Center Utrecht, Utrecht, the Netherlands
| | - I Isgum
- Image Sciences Institute (N.K., I.I.), University Medical Center Utrecht, Utrecht, the Netherlands
| | - H Ter Heide
- Pediatric Cardiology (N.H.P.C., H.t.H., T.J.S., J.M.P.J.B.)
| | - T J Steenhuis
- Pediatric Cardiology (N.H.P.C., H.t.H., T.J.S., J.M.P.J.B.)
| | - E Turk
- From the Departments of Neonatology (N.H.P.C., E.T., L.S.d.V., M.J.N.L.B.)
| | - N J G Jansen
- Pediatric Intensive Care (N.H.P.C., N.J.G.J.).,Department of Pediatrics (N.J.G.J.), Beatrix Children's Hospital, University Medical Center Groningen, Groningen, the Netherlands
| | - L S de Vries
- From the Departments of Neonatology (N.H.P.C., E.T., L.S.d.V., M.J.N.L.B.)
| | - J M P J Breur
- Pediatric Cardiology (N.H.P.C., H.t.H., T.J.S., J.M.P.J.B.)
| | - R de Heus
- Obstetrics (R.d.H.), Wilhelmina Children's Hospital, Utrecht, the Netherlands
| | - M J N L Benders
- From the Departments of Neonatology (N.H.P.C., E.T., L.S.d.V., M.J.N.L.B.)
| |
Collapse
|
10
|
Khalili N, Turk E, Zreik M, Viergever MA, Benders MJNL, Išgum I. Generative Adversarial Network for Segmentation of Motion Affected Neonatal Brain MRI. Lecture Notes in Computer Science 2019. [DOI: 10.1007/978-3-030-32248-9_36] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
11
|
Wei Y, Scholtens LH, Turk E, van den Heuvel MP. Multiscale examination of cytoarchitectonic similarity and human brain connectivity. Netw Neurosci 2018; 3:124-137. [PMID: 30793077 PMCID: PMC6372019 DOI: 10.1162/netn_a_00057] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 05/01/2018] [Indexed: 11/05/2022] Open
Abstract
The human brain comprises an efficient communication network, with its macroscale connectome organization argued to be directly associated with the underlying microscale organization of the cortex. Here, we further examine this link in the human brain cortex by using the ultrahigh-resolution BigBrain dataset; 11,660 BigBrain profiles of laminar cell structure were extracted from the BigBrain data and mapped to the MRI based Desikan-Killiany atlas used for macroscale connectome reconstruction. Macroscale brain connectivity was reconstructed based on the diffusion-weighted imaging dataset from the Human Connectome Project and cross-correlated to the similarity of laminar profiles. We showed that the BigBrain profile similarity between interconnected cortical regions was significantly higher than those between nonconnected regions. The pattern of BigBrain profile similarity across the entire cortex was also found to be strongly correlated with the pattern of cortico-cortical connectivity at the macroscale. Our findings suggest that cortical regions with higher similarity in the laminar cytoarchitectonic patterns have a higher chance of being connected, extending the evidence for the linkage between macroscale connectome organization and microscale cytoarchitecture.
Collapse
Affiliation(s)
- Yongbin Wei
- Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Lianne H. Scholtens
- Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Elise Turk
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
- Brain Center Rudolf Magnus, Department of Neonatology, Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Martijn P. van den Heuvel
- Department of Complex Trait Genetics, Center for Neurogenomics and Cognitive Research, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
- Department of Clinical Genetics, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, Amsterdam, The Netherlands
| |
Collapse
|
12
|
Nguyen L, Pluim C, Schiehser D, Turk E, Lessig S, Song D, Litvan I, Filoteo J. C-61Predictors of Freezing of Gait in Parkinson's Disease: The Influence of Mood and Cognition. Arch Clin Neuropsychol 2016. [DOI: 10.1093/arclin/acw043.210] [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: 11/12/2022] Open
|
13
|
Lopez F, Split M, Schiehser D, Turk E, Lessig S, Song D, Litvan I, Filoteo J. C-59Characterizing Apathy in Patients with Parkinson's Disease. Arch Clin Neuropsychol 2016. [DOI: 10.1093/arclin/acw043.208] [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: 11/13/2022] Open
|
14
|
Split M, Lopez F, Schiehser D, Turk E, Lessig S, Song D, Litvan I, Filoteo J. C-64Differential Predictors of Burden and Depression Symptoms in Caregivers of Patients with Parkinson's Disease. Arch Clin Neuropsychol 2016. [DOI: 10.1093/arclin/acw043.213] [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: 11/14/2022] Open
|
15
|
Pluim C, Nguyen L, Schiehser D, Turk E, Lessig S, Song D, Litvan I, Filoteo J. C-58The Impact of Dopamine Agonists on Sensitivity to Punishment and Sensitivity to Reward in Individuals with Parkinson's Disease. Arch Clin Neuropsychol 2016. [DOI: 10.1093/arclin/acw043.207] [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: 11/14/2022] Open
|
16
|
van den Heuvel MP, Scholtens LH, Turk E, Mantini D, Vanduffel W, Feldman Barrett L. Multimodal analysis of cortical chemoarchitecture and macroscale fMRI resting-state functional connectivity. Hum Brain Mapp 2016; 37:3103-13. [PMID: 27207489 PMCID: PMC5111767 DOI: 10.1002/hbm.23229] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [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: 12/10/2015] [Revised: 04/13/2016] [Accepted: 04/15/2016] [Indexed: 12/14/2022] Open
Abstract
The cerebral cortex is well known to display a large variation in excitatory and inhibitory chemoarchitecture, but the effect of this variation on global scale functional neural communication and synchronization patterns remains less well understood. Here, we provide evidence of the chemoarchitecture of cortical regions to be associated with large‐scale region‐to‐region resting‐state functional connectivity. We assessed the excitatory versus inhibitory chemoarchitecture of cortical areas as an ExIn ratio between receptor density mappings of excitatory (AMPA, M1) and inhibitory (GABAA, M2) receptors, computed on the basis of data collated from pioneering studies of autoradiography mappings as present in literature of the human (2 datasets) and macaque (1 dataset) cortex. Cortical variation in ExIn ratio significantly correlated with total level of functional connectivity as derived from resting‐state functional connectivity recordings of cortical areas across all three datasets (human I: P = 0.0004; human II: P = 0.0008; macaque: P = 0.0007), suggesting cortical areas with an overall more excitatory character to show higher levels of intrinsic functional connectivity during resting‐state. Our findings are indicative of the microscale chemoarchitecture of cortical regions to be related to resting‐state fMRI connectivity patterns at the global system's level of connectome organization. Hum Brain Mapp 37:3103–3113, 2016. © 2016 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Martijn P van den Heuvel
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, The Netherlands
| | - Lianne H Scholtens
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, The Netherlands
| | - Elise Turk
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, The Netherlands
| | - Dante Mantini
- Laboratory for Neuro- and Psychophysiology, KU Leuven, Leuven, Belgium.,Movement Control and Neuroplasticity Research Group, KU Leuven, Leuven, Belgium.,Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland
| | - Wim Vanduffel
- Laboratory for Neuro- and Psychophysiology, KU Leuven, Leuven, Belgium.,Department of Radiology, Harvard Medical School, Boston, Massachusetts
| | - Lisa Feldman Barrett
- Department of Psychology, Northeastern University, Boston, Massachusetts.,Psychiatric Neuroimaging Program, Department of Psychiatry, and the Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts
| |
Collapse
|
17
|
Yabanoglu H, Karagulle E, Belli S, Turk E. Results of Modified Dufourmentel Rhomboid Flap in Patients with Extensive Sacrococcygeal Pilonidal Disease. Acta Chir Belg 2016. [DOI: 10.1080/00015458.2014.11680977] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- H. Yabanoglu
- Department of General Surgery, Hakkari State Hospital, Hakkari, Turkey
| | - E. Karagulle
- Department of General Surgery, Baskent University Faculty of Medicine, Ankara, Turkey
| | - S. Belli
- Department of General Surgery, Baskent University Faculty of Medicine, Ankara, Turkey
| | - E. Turk
- Department of General Surgery, Baskent University Faculty of Medicine, Ankara, Turkey
| |
Collapse
|
18
|
Turk E, Scholtens LH, van den Heuvel MP. Cortical chemoarchitecture shapes macroscale effective functional connectivity patterns in macaque cerebral cortex. Hum Brain Mapp 2016; 37:1856-65. [PMID: 26970255 DOI: 10.1002/hbm.23141] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [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: 08/05/2015] [Revised: 12/23/2015] [Accepted: 02/02/2016] [Indexed: 12/25/2022] Open
Abstract
The mammalian cortex is a complex system of-at the microscale level-interconnected neurons and-at the macroscale level-interconnected areas, forming the infrastructure for local and global neural processing and information integration. While the effects of regional chemoarchitecture on local cortical activity are well known, the effect of local neurotransmitter receptor organization on the emergence of large scale region-to-region functional interactions remains poorly understood. Here, we examined reports of effective functional connectivity-as measured by the action of strychnine administration acting on the chemical balance of cortical areas-in relation to underlying regional variation in microscale neurotransmitter receptor density levels in the macaque cortex. Linking cortical variation in microscale receptor density levels to collated information on macroscale functional connectivity of the macaque cortex, we show macroscale patterns of effective corticocortical functional interactions-and in particular, the strength of connectivity of efferent macroscale pathways-to be related to the ratio of excitatory and inhibitory neurotransmitter receptor densities of cortical areas. Our findings provide evidence for the microscale chemoarchitecture of cortical areas to have a direct stimulating influence on the emergence of macroscale functional connectivity patterns in the mammalian brain. Hum Brain Mapp 37:1856-1865, 2016. © 2016 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Elise Turk
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Lianne H Scholtens
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Martijn P van den Heuvel
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, Utrecht, The Netherlands
| |
Collapse
|
19
|
Collin G, Turk E, van den Heuvel MP. Connectomics in Schizophrenia: From Early Pioneers to Recent Brain Network Findings. Biol Psychiatry Cogn Neurosci Neuroimaging 2016; 1:199-208. [PMID: 29560880 DOI: 10.1016/j.bpsc.2016.01.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 01/15/2016] [Accepted: 01/19/2016] [Indexed: 12/15/2022]
Abstract
Schizophrenia has been conceptualized as a brain network disorder. The historical roots of connectomics in schizophrenia go back to the late 19th century, when influential scholars such as Theodor Meynert, Carl Wernicke, Emil Kraepelin, and Eugen Bleuler worked on a theoretical understanding of the multifaceted syndrome that is currently referred to as schizophrenia. Their work contributed to the understanding that symptoms such as psychosis and cognitive disorganization might stem from abnormal integration or dissociation due to disruptions in the brain's association fibers. As methods to test this hypothesis were long lacking, the claims of these early pioneers remained unsupported by empirical evidence for almost a century. In this review, we revisit and pay tribute to the old masters and, discussing recent findings from the developing field of disease connectomics, we examine how their pioneering hypotheses hold up in light of current evidence.
Collapse
Affiliation(s)
- Guusje Collin
- Department of Psychiatry, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands.
| | - Elise Turk
- Department of Psychiatry, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands
| | - Martijn P van den Heuvel
- Department of Psychiatry, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands
| |
Collapse
|
20
|
Oguz H, Karagulle E, Turk E, Moray G. Comparison of peritoneal closure techniques in laparoscopic transabdominal preperitoneal inguinal hernia repair: a prospective randomized study. Hernia 2015; 19:879-85. [PMID: 26486322 DOI: 10.1007/s10029-015-1431-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [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: 02/11/2015] [Accepted: 10/05/2015] [Indexed: 02/06/2023]
Abstract
PURPOSE We aimed to compare tacker and suture techniques for peritoneal closure with respect to patient outcomes. METHODS A total of 64 patients were included in the study, 32 being in the tacker group and 32 in the suture group. All patients underwent laparoscopic TAPP inguinal hernia repair. Both groups were compared with respect to age, sex, duration of peritoneal closure and the operation, hernia type, the number of tackers used for mesh fixation, postoperative complication rate, visual analogue scale (VAS) scores on 1st, 7th, and 30th days, duration of follow-up, and recurrence rates. RESULTS Duration of peritoneal closure and the operation was significantly shorter in the tacker group compared to the suture group (p < 0.001, p = 0.008, respectively). Statistical analysis with the two-way analysis of variance method revealed that mesh fixation with one or two tackers did not influence postoperative pain. VAS 1 was significantly lower in patients with peritoneal closure with suture compared to the patients undergoing peritoneal closure with tacker (p = 0.027). VAS 7 and VAS 30 were lower for peritoneal closure with suture versus tacker, although the difference did not reach statistical significance (p = 0.064, p = 0.294, respectively). We observed no recurrence at an average of 21-month follow-up. CONCLUSIONS Tacker and suture appeared to have a comparable safety for peritoneal closure in laparoscopic TAPP inguinal hernia operation. It can be suggested that peritoneal closure with tacker increased short-term pain, independent of the number of tackers used for mesh fixation. Long-term pain was similar in both groups.
Collapse
Affiliation(s)
- H Oguz
- Department of General Surgery, Faculty of Medicine, Baskent University, Ankara, Turkey
| | - E Karagulle
- Department of General Surgery, Faculty of Medicine, Baskent University, Ankara, Turkey.
- Baskent Universitesi Konya Hastanesi Hocacihan Mah, Saray caddesi No:1, Selcuklu/Konya, 42080, Turkey.
| | - E Turk
- Department of General Surgery, Faculty of Medicine, Baskent University, Ankara, Turkey
| | - G Moray
- Department of General Surgery, Faculty of Medicine, Baskent University, Ankara, Turkey
| |
Collapse
|
21
|
Hernandez-Mejia M, Prendiville B, Fong C, Burke M, Nguyen L, Schiehser D, Turk E, Delis D, Filoteo J. A-27The Impact of Reduced Retrieval Demands on Verbal Memory in Parkinson's Disease Patients at Various Levels of Global Cognitive Functioning. Arch Clin Neuropsychol 2015. [DOI: 10.1093/arclin/acv047.27] [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: 11/12/2022] Open
|
22
|
Turk E, Acimis NM, Karaca F, Edirne Y, Tan A, Kilic C. The effect on postoperative pain of pulling the rectus muscle medially during open appendectomy surgery. MINERVA CHIR 2014; 69:141-146. [PMID: 24970302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
AIM We investigated whether pulling the rectus muscle medially during open appendectomy surgery had any effect on postoperative pain in this study. METHODS This prospective study was performed on patients 6 years and older who were admitted for acute appendicitis. The patients were divided into two groups, open appendectomy was performed by pulling the rectus muscle medially in the first group and splitting the rectus muscle in the second group. Pain was evaluated in both groups at preoperative and 12 and 24 hour postoperative by using a visual analog scale graded. RESULTS The first group consisted of 31 and the second group of 30 patients. The preoperative and 12 and 24 hour postoperative pain evaluation results were 8.25 ± 1.03, 2.96 ± 1.40 and 1.16 ± 0.93 in the first group and 8.36 ± 0.99, 4.90 ± 1.24 and 2.03 ± 1.06 respectively in the second group. There was no statistically significant difference between the two groups for age, gender, inpatient duration and preoperative pain scores while the 12 and 24 hour postoperative pain scores were lower in the first group than the second group. This difference was statistically significant (P<0.05). CONCLUSION Performing the appendectomy by pulling the rectus muscle medially in clinics using open appendectomy will provide a more comfortable postoperative period for the children.
Collapse
Affiliation(s)
- E Turk
- Department of Pediatric Surgery, Izmir University, Faculty of Medicine, Izmir, Turkey -
| | | | | | | | | | | |
Collapse
|
23
|
Yabanoglu H, Karagulle E, Belli S, Turk E. Results of modified Dufourmentel rhomboid flap in patients with extensive Sacrococcygeal pilonidal disease. Acta Chir Belg 2014; 114:52-57. [PMID: 24720139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
PURPOSE The aim of our study was to assess our modified Dufourmentel flap outcomes in a standardized patient group (a symptom duration of equal to or greater than 60 months, presence of equal to or more than 3 sinus ostia or presence of sinus ostia fistulized equal to or greater than 2 cm laterally, and a normal body mass index) with extensive pilonidal sinus. METHODS Patients who were diagnosed with chronic pilonidal sinus disease and gave consent to surgical repair with modified Dufourmentel flap were enrolled. Patients were assessed with respect to age, sex, body mass index, presenting symptom, symptom duration, number of previous operations, number of sinus ostia, length of flap rims, depth of intergluteal sulcus, distance of sinus from anus, duration of operation, time of drain removal, length of hospital stay, early postoperative complications, postoperative pain, loss of labor, length of follow-up, and recurrences. RESULTS A total of 42 patients were enrolled. Average duration of presenting symptoms was 64.4 +/- 4.7 months and average length of follow-up was 29.4 +/- 3.6 months. Average length of hospital stay was 4.2 +/- 0.8 days, and time to return to work was 16.3 +/- 2.1 days. Two patients (4.7%) developed postoperative wound infection, one patient (2.4%) developed seroma, and three patients (7.1%) had wound dehiscence. There was no recurrence. CONCLUSION Modified Dufourmentel flap application can be safely used in the treatment of extensive pilonidal sinus disease.
Collapse
|
24
|
Turk E, Karagulle E, Oguz H, Toprak E. Indirect hernial sac containing the uterus, ovary, and fallopian tube in association with a giant intraabdominal lipoma: report of a case. Hernia 2011; 16:593-5. [PMID: 21267614 DOI: 10.1007/s10029-011-0790-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2010] [Accepted: 01/09/2011] [Indexed: 10/18/2022]
Abstract
Presence of the ovary, fallopian tube, and uterus within an inguinal hernia is a rare condition. In this report, we describe the case of a 47-year-old female, multiparous patient with a giant omental lipoma (18 × 8 × 7 cm, 422 g) and left inguinal hernia. The uterus, left ovary, and fallopian tube were in the hernial sac. The presence of the uterus within the hernial sac accompanies mullerian anomalies, although, in this case, there was no such anomaly. To our knowledge, there have been no cases in the literature of a giant intraabdominal lipoma and a hernial sac containing the uterus, ovary, and fallopian tube, but a few cases of inguinal hernia involving the ovary, fallopian tube, and uterus have been reported. The aim of this case report was to call attention to the observation that the inguinal hernia seen in female patients may involve the ovary, fallopian tube, and uterus.
Collapse
Affiliation(s)
- E Turk
- Department of General Surgery, Baskent University Faculty of Medicine, Ankara, Turkey
| | | | | | | |
Collapse
|
25
|
Turk E, Temir ZG, Karkiner A, Memis A, Topalak O, Evciler H, Ucan B, Karaca I. Bilhemia, an unusual complication after blunt liver trauma in a child: case report and review of the literature. Eur J Pediatr Surg 2010; 20:212-4. [PMID: 20387204 DOI: 10.1055/s-0030-1249697] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- E Turk
- Dr. Behcet Uz Children's Hospital, Pediatric Surgery, IZMIR, Turkey.
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Karakayali H, M.H.F., Turk E, Tarim A, Basaran O, Arslan G. Self-inflicted burns: One center's experience. Burns 2007. [DOI: 10.1016/j.burns.2006.10.110] [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: 11/30/2022]
|
27
|
Turk E, M.H.F., Moray G, Basaran O, Tarim A. Gluteal burn due to sitting on a hot brick. Burns 2007. [DOI: 10.1016/j.burns.2006.10.117] [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: 10/23/2022]
|
28
|
Turk E, M.H.M.F., Karakayali H, Kut A, Basaran O. Use of telemedicine in decision making and burn follow-up: Initial experience from two burn units. Burns 2007. [DOI: 10.1016/j.burns.2006.10.123] [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: 10/23/2022]
|
29
|
M.H.F., Karakayali H, Noyan T, Turk E, Tarim A, Basaran O. Burn care facilities at Baþkent university burn and fire disaster institute in 2005. Burns 2007. [DOI: 10.1016/j.burns.2006.10.122] [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: 10/23/2022]
|
30
|
Tarim A, M.H.F., Noyan T, Turk E, Basaran O, Kut A. Thermal injuries due to paint thinner ignition: Experience of a burn care network in Turkey. Burns 2007. [DOI: 10.1016/j.burns.2006.10.109] [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]
|
31
|
Leung DW, Turk E, Kim O, Wright EM. Functional expression of the Vibrio parahaemolyticus Na+/galactose (vSGLT) cotransporter in Xenopus laevis oocytes. J Membr Biol 2002; 187:65-70. [PMID: 12029378 DOI: 10.1007/s00232-001-0152-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2001] [Indexed: 10/27/2022]
Abstract
We have successfully expressed a bacterial cotransporter in a functional form in the Xenopus laevis oocyte expression system. The goals were to compare the kinetics and selectivity of the cotransporter expressed in oocytes with those obtained in bacteria and in proteoliposomes, and to determine if it is possible to measure the electrical properties of the bacterial cotransporter expressed in oocytes. The Vibrio parahaemolyticus Na+/galactose cotransporter (vSGLT) expressed in oocytes has functional properties that are similar to those expressed in bacteria and those of the purified cotransporter reconstituted into liposomes. vSGLT is a Na+-dependent transporter that is saturable with Na+ (K(0.5)=17 mM) and D-galactose (K(0.5)=237 microM) and is sensitive to both D-fucose and phlorizin. In addition, vSGLT in oocytes shows a sugar specificity in the order of D-galactose >D-fucose > D-glucose, distinguishing it from the animal members of the Na+/glucose cotransporter family. The level of transport by vSGLT in oocytes is lower overall (V(max) approximately 10 pmol/oocyte/hour) compared to other plant and animal cotransporters (V(max) approximately 1000 pmol/oocyte/hour). The low level of expression does not permit us to carry out electrophysiological studies of the bacterial cotransporter. This study shows the potential and unique advantages of utilizing a eukaryotic oocyte expression system to study bacterial cotransporters.
Collapse
Affiliation(s)
- D W Leung
- Department of Physiology, UCLA School of Medicine, 10833 Le Conte Ave., Los Angeles, CA 90095-1751, USA
| | | | | | | |
Collapse
|
32
|
Veenstra M, Turk E, Wright EM. A ligand-dependent conformational change of the Na+/galactose cotransporter of Vibrio parahaemolyticus, monitored by tryptophan fluorescence. J Membr Biol 2002; 185:249-55. [PMID: 11891582 DOI: 10.1007/s00232-001-0127-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2001] [Indexed: 10/28/2022]
Abstract
Purification and reconstitution of the active Vibrio parahaemolyticus Na+/galactose transporter (vSGLT) enables us to do protein chemistry studies on a representative member of this class of membrane transporters. By measuring intrinsic tryptophan (Trp) fluorescence, conformational changes on the binding of substrates could be investigated. Trp fluorescence increased by 6% on the addition of saturating levels of both Na+ and D-galactose, with a K0.5 for D-galactose of 0.6 mM. No change was seen on the addition of Na+ alone or by adding D-galactose in the presence of K+. The Trp fluorescence could be quenched by acrylamide, but not by Cs+or I?. In the presence of Na+ or K+ alone, of Na+ or K+ and D-galactose, of Na+ and L-glucose, or in the absence of ligands, the fluorescence quenches by acrylamide were similar. This indicated that the tryptophan exposure to acrylamide was unchanged in the presence or absence of ligands. No shifts in lem maximum were observed. To find the Trp responsible for the change in fluorescence, Trp 448 in transmembrane helix 11 in the putative sugar-binding pocket was mutated. It was found that W448F showed a similar change in Trp fluorescence upon the addition of D-galactose in the presence of Na+. We conclude that the Trp fluorescence properties of the purified and reconstituted Na+/galactose cotransporter are selectively changed by the transported substrates Na+ and D-galactose, but it is not the Trp (W448) in the sugar translocation pathway that is involved.
Collapse
Affiliation(s)
- M Veenstra
- Department of Physiology, UCLA School of Medicine, 10833 Le Conte Ave., Los Angeles, CA 90095-1751, USA.
| | | | | |
Collapse
|
33
|
Xie Z, Turk E, Wright EM. Characterization of the Vibrio parahaemolyticus Na+/Glucose cotransporter. A bacterial member of the sodium/glucose transporter (SGLT) family. J Biol Chem 2000; 275:25959-64. [PMID: 10852908 DOI: 10.1074/jbc.m002687200] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Vibrio parahaemolyticus sodium/glucose transporter (vSGLT) is a bacterial member of the SGLT gene family. Wild-type and mutant vSGLT proteins were expressed in Escherichia coli, and transport activity was measured in intact cells and plasma membrane vesicles. Two cysteine-less vSGLT proteins exhibited sugar transport rates comparable with that of the wild-type protein. Six residues in two regions of vSGLT known to be of functional importance in SGLT1 were replaced individually with cysteine in the cysteine-less protein. Characterization of these single cysteine-substituted vSGLTs showed that two residues (Gly-151 and Gln-428) are essential for transport function, whereas the other four residues (Leu-147, Leu-149, Ala-423, and Gln-425) are not. 2-Aminoethylmethanethiosulfonate (MTSEA) blocked Na(+)/glucose transport by only the transporter bearing a cysteine at position 425 (Q425C). MTSEA inhibition was reversed by dithiothreitol and blocked by the presence of both Na(+) and d-glucose, indicating that conformational changes of the vSGLT protein are involved in Na(+)/glucose transport. A split version of vSGLT was generated by co-expression of the N-terminal (N(7)) and C-terminal (C(7)) halves of the transporter. The split vSGLT maintained Na(+)-dependent glucose transport activity. Chemical cross-linking of split vSGLT, with a cysteine in each N(7) and C(7) fragment, suggested that hydrophilic loops between helices 4 and 5 and between helices 10 and 11 are within 8 A of each other. We conclude that the mechanism of Na(+)/glucose transport by vSGLT is similar to mammalian SGLTs and that further studies on vSGLT will provide novel insight to the structure and function of this class of cotransporters.
Collapse
Affiliation(s)
- Z Xie
- Department of Physiology, UCLA School of Medicine, Los Angeles, California 90095-1751, USA
| | | | | |
Collapse
|
34
|
Turk E, Kim O, le Coutre J, Whitelegge JP, Eskandari S, Lam JT, Kreman M, Zampighi G, Faull KF, Wright EM. Molecular characterization of Vibrio parahaemolyticus vSGLT: a model for sodium-coupled sugar cotransporters. J Biol Chem 2000; 275:25711-6. [PMID: 10835424 DOI: 10.1074/jbc.m003127200] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Na(+)/galactose cotransporter (vSGLT) of Vibrio parahaemolyticus, tagged with C-terminal hexahistidine, has been purified to apparent homogeneity by Ni(2+) affinity chromatography and gel filtration. Resequencing the vSGLT gene identified an important correction: the N terminus constitutes an additional 13 functionally essential residues. The mass of His-tagged vSGLT expressed under its native promoter, as determined by electrospray ionization-mass spectrometry (ESI-MS), verifies these 13 residues in wild-type vSGLT. A fusion protein of vSGLT and green fluorescent protein, comprising a mass of over 90 kDa, was also successfully analyzed by ESI-MS. Reconstitution of purified vSGLT yields proteoliposomes active in Na(+)-dependent galactose uptake, with sugar preferences (galactose > glucose > fucose) reflecting those of wild-type vSGLT in vivo. Substrates are transported with apparent 1:1 stoichiometry and apparent K(m) values of 129 mm (Na(+)) and 158 microm (galactose). Freeze-fracture electron microscopy of functional proteoliposomes shows intramembrane particles of a size consistent with vSGLT existing as a monomer. We conclude that vSGLT is a suitable model for the study of sugar cotransporter mechanisms and structure, with potential applicability to the larger SGLT family of important sodium:solute cotransporters. It is further demonstrated that ESI-MS is a powerful tool for the study of proteomics of membrane transporters.
Collapse
Affiliation(s)
- E Turk
- Department of Physiology, University of California, Los Angeles 90095- 1751, USA.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
le Coutre J, Whitelegge JP, Gross A, Turk E, Wright EM, Kaback HR, Faull KF. Proteomics on full-length membrane proteins using mass spectrometry. Biochemistry 2000; 39:4237-42. [PMID: 10757971 DOI: 10.1021/bi000150m] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A general technique has been developed that allows rapid mass spectrometric analysis of full-length membrane proteins [Whitelegge, J. P., le Coutre, J., et al. (1999) Proc. Natl. Acad. Sci. U.S.A. 96, 10695-10698]. Using in-line HPLC electrospray ionization mass spectrometry (LC-MS), different native and recombinant bacterial membrane proteins of up to 61 kDa are characterized. Mass spectrometric data of four entirely different membrane proteins from three bacterial organisms, two transporters, a channel, and a porin protein are presented. In addition to determination of the molecular mass with an accuracy of +/-0.01%, the technique monitors alkylation or oxidation of single Cys residues and errors in deduced amino acid sequences. Finally, using in-line LC-MS, unknown proteins can be identified from solubilized Escherichia coli membranes without prior purification.
Collapse
Affiliation(s)
- J le Coutre
- Howard Hughes Medical Institute, Departments of Physiology and of Microbiology and Molecular Genetics, Molecular Biology Institute, University of California, Los Angeles 90095, USA.
| | | | | | | | | | | | | |
Collapse
|
36
|
Martín MG, Wang J, Solorzano-Vargas RS, Lam JT, Turk E, Wright EM. Regulation of the human Na(+)-glucose cotransporter gene, SGLT1, by HNF-1 and Sp1. Am J Physiol Gastrointest Liver Physiol 2000; 278:G591-603. [PMID: 10762614 DOI: 10.1152/ajpgi.2000.278.4.g591] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The Na(+)-glucose cotransporter (SGLT1) is expressed primarily by small intestinal epithelial cells and transports the monosaccharides glucose and galactose across the apical membrane. Here we describe the isolation and characterization of 5.3 kb of the 5'-flanking region of the SGLT1 gene by transiently transfecting reporter constructs into a variety of epithelial cell lines. A fragment (nt -235 to +22) of the promoter showed strong activity in the intestinal cell line Caco-2 but was inactive in a nonintestinal epithelial cell line (Chinese hamster ovary). Within this region, three cis-elements, a hepatocyte nuclear factor-1 (HNF-1) and two GC box sites are critical for maintaining the gene's basal level of expression. The two GC boxes bind to several members of the Sp1 family of transcription factors and, in the presence of HNF-1, synergistically upregulate transactivation of the promoter. A novel 16-bp element just downstream of one GC box was also shown to influence the interaction of Sp1 to its binding site. In summary, we report the identification and characterization of the human SGLT1 minimal promoter and the critical role that HNF-1 and Sp1-multigene members have in enhancing the basal level of its transcription in Caco-2 cells.
Collapse
Affiliation(s)
- M G Martín
- Department of Division of Gastroenterology and Nutrition, UCLA School of Medicine, Los Angeles 90095-1751, USA.
| | | | | | | | | | | |
Collapse
|
37
|
Lam JT, Martín MG, Turk E, Hirayama BA, Bosshard NU, Steinmann B, Wright EM. Missense mutations in SGLT1 cause glucose-galactose malabsorption by trafficking defects. Biochim Biophys Acta 1999; 1453:297-303. [PMID: 10036327 DOI: 10.1016/s0925-4439(98)00109-4] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Glucose-galactose malabsorption (GGM) is an autosomal recessive disorder caused by defects in the Na+/glucose cotransporter (SGLT1). Neonates present with severe diarrhea while on any diet containing glucose and/or galactose [1]. This study focuses on a patient of Swiss and Dominican descent. All 15 exons of SGLT1 were screened using single stranded conformational polymorphism analyses, and aberrant PCR products were sequenced. Two missense mutations, Gly318Arg and Ala468Val, were identified. SGLT1 mutants were expressed in Xenopus laevis oocytes for radiotracer uptake, electrophysiological experiments, and Western blotting. Uptakes of [14C]alpha-methyl-d-glucoside by the mutants were 5% or less than that of wild-type. Two-electrode voltage-clamp experiments confirmed the transport defects, as no noticeable sugar-induced current could be elicited from either mutant [2]. Western blots of cell protein showed levels of each SGLT1 mutant protein comparable to that of wild-type, and that both were core-glycosylated. Presteady-state current measurements indicated an absence of SGLT1 in the plasma membrane. We suggest that the compound heterozygote missense mutations G318R and A468V lead to GGM in this patient by defective trafficking of mutant proteins from the endoplasmic reticulum to the plasma membrane.
Collapse
Affiliation(s)
- J T Lam
- Department of Physiology, UCLA School of Medicine, 10833 Le Conte Avenue, Los Angeles, CA 90095-1751, USA
| | | | | | | | | | | | | |
Collapse
|
38
|
Mullen JL, Turk E, Johnson K, Wolverton C, Ishikawa H, Simmons C, Söll D, Evans ML. Root-growth behavior of the Arabidopsis mutant rgr1. Roles of gravitropism and circumnutation in the waving/coiling phenomenon. Plant Physiol 1998; 118:1139-45. [PMID: 9847088 PMCID: PMC34730 DOI: 10.1104/pp.118.4.1139] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/1998] [Accepted: 09/11/1998] [Indexed: 05/18/2023]
Abstract
In this study we investigated the kinetics of the gravitropic response of the Arabidopsis mutant rgr1 (reduced root gravitropism). Although the rate of curvature in rgr1, which is allelic to axr4, was smaller than in the wild type (ecotype Wassilewskija), curvature was initiated in the same region of the root, the distal elongation zone. The time lag for the response was unaffected in the mutant; however, the gravitropic response of rgr1 contained a feature not found in the wild type: when roots growing along the surface of an agar plate were gravistimulated, there was often an upward curvature that initiated in the central elongation zone. Because this response was dependent on the tactile environment of the root, it most likely resulted from the superposition of the waving/coiling phenomenon onto the gravitropic response. We found that the frequency of the waving pattern and circumnutation, a cyclic endogenous pattern of root growth, was the same in rgr1 and in the wild type, so the waving/coiling phenomenon is likely governed by circumnutation patterns. The amplitudes of these oscillations may then be selectively amplified by tactile stimulation to provide a directional preference to the slanting.
Collapse
Affiliation(s)
- J L Mullen
- Department of Plant Biology, The Ohio State University, Columbus, Ohio 43210-1293, USA
| | | | | | | | | | | | | | | |
Collapse
|
39
|
Wright EM, Loo DD, Panayotova-Heiermann M, Hirayama BA, Turk E, Eskandari S, Lam JT. Structure and function of the Na+/glucose cotransporter. Acta Physiol Scand Suppl 1998; 643:257-64. [PMID: 9789568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Cotransporters are a major class of membrane transport proteins that are responsible for the accumulation of nutrients, neurotransmitters, osmolytes and ions in cells from bacteria to man. The energy for solute accumulation comes from the proton and/or sodium electrochemical gradients that exist across cell membranes. A major problem in biology is how transport is coupled to these electrochemical potential gradients. The primary example of this class of membrane proteins is the intestinal brush border Na+/glucose cotransporter (SGLT1), first described by Bob Crane in 1960. Over 35 members of the SGLT1 gene family have been identified in animal cells, yeast and bacteria, and all share a common core structure of 13 transmembrane (TM) helices. Electrophysiological techniques have been used to examine the function of several family members, chimeras and mutants expressed in heterologous systems such as Xenopus laevis oocytes. These have revealed that cotransporters are multi-functional proteins: they are responsible for 1). uncoupled passive Na+ transport (Na+ uniport); 2). down-hill water transport in the absence of substrate; 3). Na+/substrate cotransport; and 4). Na+/substrate/water cotransport. The sugar binding and translocation pathway is formed by 4 TM helices near the C-terminal of the protein, helices 10-13. We propose that the N-terminal domains of SGLT1 are responsible for Na+ binding and/or translocation, and that Na+/glucose cotransport results from interactions between the N- and C-terminal domains of the protein.
Collapse
Affiliation(s)
- E M Wright
- Department of Physiology, UCLA Medical Center 90095-1751, USA
| | | | | | | | | | | | | |
Collapse
|
40
|
Abstract
The mechanism by which cotransport proteins couple their substrates across cell membranes is not known. A commonly proposed model is that cotransport results from ligand-induced conformational transitions that change the accessibility of ligand-binding sites from one side of the membrane to the other. To test this model, we have measured the accessibility of covalent probes to a cysteine residue (Q457C) placed in the putative sugar-translocation domain of the Na+/glucose cotransporter (SGLT1). The mutant protein Q457C was able to transport sugar, but transport was abolished after alkylation by methanethiosulfonate reagents. Alkylation blocked sugar translocation but not sugar binding. Accessibility of Q457C to alkylating reagents required external Na+ and was blocked by external sugar and phlorizin. The voltage dependence of accessibility was directly correlated with the presteady-state charge movement of SGLT1. Voltage-jump experiments with rhodamine-6-maleimide-labeled Q457C showed that the time course and level of changes in fluorescence closely followed the presteady-state charge movement. We conclude that conformational changes are responsible for the coupling of Na+ and sugar transport and that Q457 plays a critical role in sugar translocation by SGLT1.
Collapse
Affiliation(s)
- D D Loo
- Department of Physiology, University of California Los Angeles School of Medicine, Center for the Health Sciences, Los Angeles, CA 90095-1751, USA.
| | | | | | | | | | | |
Collapse
|
41
|
Abstract
Homologues of the Na+/glucose cotransporter, the SGLT family, include sequences of mammalian, eubacterial, yeast, insect and nematode origin. The cotransported substrates are sugars, inositol, proline, pantothenate, iodide, urea and undetermined solutes. It is reasonable to expect that the SGLT family members share a similar or identical topology of membrane spanning elements, by virtue of their common ancestry and similar coupling of solute transport to downhill sodium flux. Here we examine their membrane topologies as deduced from diverse analyses of their primary sequences, and from their sequence correlations with the experimentally determined topology of the human Na+/ glucose contransporter SGLT1. Our analyses indicate that all family members share a common core of 13 transmembrane helices, but that some, like SGLT1 itself, have one additional span appended to the C-terminus, and still others, two. One bacterial member incorporates an additional span at the N-terminus. Sequence comparisons indicative of common ancestry of the SGLT and the [Na+ + Cl-] transporter families are introduced, and evaluated in light of their topologies. New evidence concerning the previously asserted common ancestry of SGLT1 and an N-acetylglucosamine permease of the bacterial phosphotransferase system is considered. Finally, we analyze observations which lead us to conjecture that the experimental strategy most commonly employed to reveal the topology of bacterial transporters (i.e., the fusion of reporter enzymes such as phoA alkaline phosphatase, beta-lactamase or beta-galactosidase, to progressively C-truncated fragments of the transporter) has often instead so perturbed local topology as to have entirely missed pairs of adjacent membrane spans.
Collapse
Affiliation(s)
- E Turk
- Department of Physiology, UCLA School of Medicine 90095-1751, USA
| | | |
Collapse
|
42
|
Panayotova-Heiermann M, Eskandari S, Turk E, Zampighi GA, Wright EM. Five transmembrane helices form the sugar pathway through the Na+/glucose cotransporter. J Biol Chem 1997; 272:20324-7. [PMID: 9252334 DOI: 10.1074/jbc.272.33.20324] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
To test the hypothesis that the C-terminal half of the Na+/glucose cotransporter (SGLT1) contains the sugar permeation pathway, a cDNA construct (C5) coding for rabbit SGLT1 amino acids 407-662, helices 10-14, was expressed in Xenopus oocytes. Expression and function of C5 was followed by Western blotting, electron microscopy, radioactive tracer, and electrophysiological methods. The C5 protein was synthesized in 20-fold higher levels than SGLT1. The particle density in the protoplasmic face of the oocyte plasma membrane increased 2-fold after C5-cRNA injection compared with noninjected oocytes. The diameters of the C5 particles were heterogeneous (4.8 +/- 0.3, 7.1 +/- 1.2, and 10.3 +/- 0.8 nm) in contrast to the endogenous particles (7.6 +/- 1.2 nm). C5 increased the alpha-methyl-D-glucopyranoside (alphaMDG) uptake up to 20-fold above that of noninjected oocytes and showed an apparent K0.5alphaMDG of 50 mM and a turnover of approximately 660 s-1. Influx was independent of Na+ with transport characteristics similar to those of SGLT1 in the absence of Na+: 1) selective (alphaMDG > D-glucose > D-galactose >> L-glucose approximately D-mannose), 2) inhibited by phloretin, KiPT = approximately 500 microM, and 3) insensitive to phlorizin. These results indicate that C5 behaves as a specific low affinity glucose uniporter. Preliminary studies with three additional constructs, hC5 (the human equivalent of C5), hC4 (human SGLT1 amino acids 407-648, helices 10-13), and hN13 (amino acids 1-648, helices 1-13), further suggest that helices 10-13 form the sugar permeation pathway for SGLT1.
Collapse
|
43
|
Abstract
BACKGROUND & AIMS Defects in the Na+-dependent glucose transporter (SGLT1) are associated with the disorder glucose-galactose malabsorption, characterized by severe diarrhea. This study focused on a unique proband with glucose-galactose malabsorption who was investigated 30 years ago, and the aims of the study were to identify mutations in the SGLT1 gene and to determine the defect in sugar transport. METHODS Mutations were identified by sequencing, and each mutant protein was then studied using a Xenopus oocyte heterologous expression system. Analysis included Western, freeze fracture, radiotracer uptake, and electrophysiological assays. RESULTS Two heterozygous missense mutations (Cys355Ser and Leu147Arg) were identified that entirely eliminated Na+/sugar cotransport activity. Western blot analysis showed that the levels of both mutant proteins in the oocyte were comparable to wild-type SGLT1, but no complex glycosylation was detected. No SGLT1 charge movements were observed with the mutant proteins, and freeze fracture data showed that neither mutant protein reached the plasma membrane. CONCLUSIONS The Cys355Ser and Leu147Arg mutations eliminate the Na+/sugar cotransport by blocking the transfer of SGLT1 protein from the endoplasmic reticulum to the plasma membrane. This is consistent with earlier studies on phlorizin binding to the brush border membrane of duodenal biopsy specimens from this patient.
Collapse
Affiliation(s)
- M G Martín
- Department of Pediatrics, UCLA School of Medicine, Los Angeles, California 90095-1751, USA.
| | | | | | | | | | | |
Collapse
|
44
|
Abstract
Recent studies of cloned mammalian sodium cotransporters in heterologous systems have revealed that these integral membrane proteins serve multiple functions as cotransporters, uniporters, channels and water transporters. Some progress has been gained in understanding their secondary structure, but information on helical bundling and tertiary structure is lacking. Site-directed mutagenesis and the construction of chimeras have resulted in the identification of residues and domains involved in ligand binding, and natural mutations have also been found that are responsible for human genetic diseases. Major factors in the short-term regulations of cotransporter function by protein kinases are exocytosis and endocytosis.
Collapse
Affiliation(s)
- E M Wright
- Department of Physiology, School of Medicine, University of California atLos Angeles, 90095-1751, USA.
| | | | | | | |
Collapse
|
45
|
Hirayama BA, Lostao MP, Panayotova-Heiermann M, Loo DD, Turk E, Wright EM. Kinetic and specificity differences between rat, human, and rabbit Na+-glucose cotransporters (SGLT-1). Am J Physiol 1996; 270:G919-26. [PMID: 8764197 DOI: 10.1152/ajpgi.1996.270.6.g919] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The Na+ activation and substrate specificity of human, rabbit, and rat Na+-glucose cotransporter (SGLT-1) isoforms were characterized using the Xenopus oocyte expression system and the two-electrode voltageclamp method. We find that there are differences, major and minor, in both the kinetics and substrate specificities between these isoforms; the substrate concentration at half-maximal current (K0.5) for hexoses varies from 0.2 to > 40 mM, depending on the species and sugar; the affinity constant (Ki) for phlorizin, the classic competitive inhibitor of SGLT-1, varies lover two orders of magnitude (rat Ki = 0.03 microM vs. rabbit Ki = 1.4 microM); and some glucoside inhibitors of the rabbit isoform, p-nitrophenyl glucose and beta-naphthyl glucose, are transported by the human and rat transporters. Na+ activation is more sensitive to membrane potential in the human and rat isoforms compared with rabbit. The rabbit isoform has a higher apparent affinity for alpha-methylglucose and 3-O-methylglucose by a factor of two than either human or rat. These results can be quantitatively fitted by our six-state kinetic model of SGLT-1, providing insight into the processes involved in these changes. For example, the model predicts that Na+ binding (rate constant, k12) in human and rat SGLT-1 is similar but is fourfold larger than in rabbit, whereas sugar binding (k23) in rabbit and rat is similar but double the value in human SGLT-1. The differences in the primary amino acid sequences between these three homologous proteins must account for the kinetic and substrate specificity differences, and comparisons of the functional properties and amino acid sequences of SGLT-1 isoforms provide useful information about structure/function relationships.
Collapse
Affiliation(s)
- B A Hirayama
- Department of Physiology, University of California School of Medicine, Los Angeles 90095-1751, USA
| | | | | | | | | | | |
Collapse
|
46
|
Abstract
Glucose-galactose malabsorption (GGM) is an autosomal recessive disorder which presents with severe osmotic diarrhoea shortly after birth. Two proband siblings with GGM were previously demonstrated to contain a missense mutation (D28N) in the Na(+)-dependent glucose/galactose cotransporter (SGLT1) that accounts for the defect in sugar absorption. Prenatal screening for GGM was performed in two subsequent pregnancies in this large consanguineous family. The first exon of the SGLT1 gene was PCR-amplified from genomic DNA and screened for the presence of the D28N mutation by EcoRV restriction digestion. The proband's sibling was heterozygous and a cousin was not a carrier of the D28N mutation. Both children at 2-years of age remain healthy and have had no diarrhoeal symptoms. Molecular biology techniques will allow a prospective determination of the presence of an abnormal SGLT1 allete and potentially decrease the postnatal morbidity.
Collapse
Affiliation(s)
- M G Martín
- Department of Physiology, UCLA School of Medicine 90095-1751, USA
| | | | | | | | | | | |
Collapse
|
47
|
Martín MG, Turk E, Lostao MP, Kerner C, Wright EM. Defects in Na+/glucose cotransporter (SGLT1) trafficking and function cause glucose-galactose malabsorption. Nat Genet 1996; 12:216-20. [PMID: 8563765 DOI: 10.1038/ng0296-216] [Citation(s) in RCA: 215] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Cotransporters harness ion gradients to drive 'active' transport of substrates into cells, for example, the Na+/glucose cotransporter (SGLT1) couples sugar transport to Na+ gradients across the intestinal brush border. Glucose-Galactose Malabsorption (GGM) is caused by a defect in SGLT1. The phenotype is neonatal onset of diarrhea that results in death unless these sugars are removed from the diet. Previously we showed that two sisters with GGM had a missense mutation in the SGLT1 gene. The gene has now been screened in 30 new patients, and a heterologous expression system has been used to link the mutations to the phenotype.
Collapse
Affiliation(s)
- M G Martín
- Department of Physiology, UCLA School of Medicine 90095-1751, USA
| | | | | | | | | |
Collapse
|
48
|
Abstract
The membrane topology of the human Na+/glucose cotransporter SGLT1 has been probed using N-glycosylation scanning mutants and nested truncations. Functional analysis proved essential for establishment of signal-anchor topology. The resultant model diverges significantly from previously held suppositions of structure based primarily on hydropathy analysis. SGLT1 incorporates 14 membrane spans. The N terminus resides extracellularly, and two hydrophobic regions form newly recognized membrane spans 4 and 12; the large charged domain near the C terminus is cytoplasmic. This model was evaluated further using two advanced empirically-based algorithms predictive of transmembrane helices. Helix ends were predicted using thermo-dynamically-based algorithms known to predict x-ray crystallographically determined transmembrane helix ends. Several considerations suggest the hydrophobic C terminus forms a 14th transmembrane helix, differentiating the eukaryotic members of the SGLT1 family from bacterial homologues. Our data inferentially indicate that these bacterial homologues incorporate 13 spans, with an extracellular N terminus. The model of SGLT1 secondary structure and the predicted helix ends signify information prerequisite for the rational design of further experiments on structure/function relationships.
Collapse
Affiliation(s)
- E Turk
- Department of Physiology, UCLA School of Medicine 90095-1751, USA
| | | | | | | |
Collapse
|
49
|
Martín MG, Turk E. The molecular basis of inherited disorders of the gastrointestinal and hepatobiliary tracts. An update on recent progress. Gastroenterol Clin North Am 1995; 24:45-70. [PMID: 7729861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
In this article, genetic disorders of the gastrointestinal and hepatobiliary tracts ranging from common to very rare are reviewed. The first portion of each section highlights the clinical manifestations of the disorder; the second and more detailed portion of each section discusses what is currently known about the biology and genetics of the disorder. The potential use of gene therapy to treat many of these disorders is also reviewed.
Collapse
Affiliation(s)
- M G Martín
- Department of Pediatrics, UCLA School of Medicine 90024, USA
| | | |
Collapse
|
50
|
Turk E, Martín MG, Wright EM. Structure of the human Na+/glucose cotransporter gene SGLT1. J Biol Chem 1994; 269:15204-9. [PMID: 8195156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Intestinal uptake of dietary glucose and galactose is mediated by the SGLT1 Na+/glucose cotransporter of the brush border. An SGLT1 missense mutation underlies hereditary glucose/galactose malabsorption, characterized by potentially fatal diarrhea; conversely, oral rehydration therapy exploits normal transport to alleviate life-threatening diarrhea of infectious origin. We have mapped the entire human SGLT1 Na+/glucose cotransporter gene from cosmid and lambda phage clones representing a genomic region of 112 kilobases. Transcription initiation occurred from a site 27 base pairs 3' of a TATAA sequence. All exon-flanking regions were sequenced, and the entire 112-kilobase region mapped with four restriction enzymes. SGLT1 is comprised of 15 exons (spanning 72 kilobases); a possible evolutionary origin from a six-membrane-span ancestral precursor via a gene duplication event is suggested from comparison of exons against protein secondary structure and from sequence considerations. A new missense mutation in exon 1 causing glucose/galactose malabsorption is also described. This is the first Na(+)-dependent cotransporter gene structure reported. These data facilitate the search for new glucose/galactose malabsorption-related mutations in this important gene and provide a basis for future evolutionary comparisons with other Na(+)-dependent cotransporters.
Collapse
Affiliation(s)
- E Turk
- Department of Physiology, UCLA School of Medicine 90024-1751
| | | | | |
Collapse
|