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Dunja Simicic

Cette personne a quitté l’EPFL

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Publications associées (30)

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Abnormal brain oxygen homeostasis in an animal model of liver disease

Cristina Ramona Cudalbu Moldovan, Dunja Simicic, Katarzyna Pierzchala

Background & Aims: Increased plasma ammonia concentration and consequent disruption of brain energy metabolism could underpin the pathogenesis of hepatic encephalopathy (HE). Brain energy homeostasis relies on effective maintenance of brain oxygenation, an ...

ELSEVIER2022

Advanced metabolite mapping at ultra-high field using 1H-MRS, 1H-MRSI and macromolecules: applications in a rat model of type C hepatic encephalopathy

Dunja Simicic

Magnetic Resonance Spectroscopy (MRS) is the only technique capable of measuring a large number of metabolites simultaneously in vivo. Ultra-high magnetic fields (UHF) combined with ultra-short echo time (TE) sequences allow the detection of high-quality 1 ...

EPFL2022

PET CMRglc mapping and H-1-MRS show altered glucose uptake and neurometabolic profiles in BDL rats

Cristina Ramona Cudalbu Moldovan, Bernard Lanz, Carole Poitry-Yamate, Dunja Simicic, Jessie Julie Mosso, Mario Gaetano Lepore, Ting Yin

Type C hepatic encephalopathy (HE) is a complex neuropsychiatric disorder occurring as a consequence of chronic liver disease. Alterations in energy metabolism have been suggested in type C HE, but in vivo studies on this matter remain sparse and have repo ...

ACADEMIC PRESS INC ELSEVIER SCIENCE2022

Heterozygous females from a rat model for creatine transporter deficiency reveal altered behavioral response to stressors, normal body weight and slight metabolic changes

Maria del Carmen Sandi Perez, Cristina Ramona Cudalbu Moldovan, Dunja Simicic

Creatine (Cr) is an organic acid essential for recycling ATP, important in tissues with high energy demand such as muscle or brain. Cr is synthesized in a 2-step pathway by the enzymes AGAT and GAMT, and transported by SLC6A8 (also called CrT). Cerebral Cr ...

2025

Neurometabolic changes in a rat pup model of type C hepatic encephalopathy depend on age at liver disease onset

Cristina Ramona Cudalbu Moldovan, Dunja Simicic, Veronika Rackayová

Chronic liver disease (CLD) is a serious condition where various toxins present in the blood affect the brain leading to type C hepatic encephalopathy (HE). Both adults and children are impacted, while children may display unique vulnerabilities depending ...

SPRINGER/PLENUM PUBLISHERS2023

Fast High-Resolution Metabolite Mapping in the rat Brain Using 1H-FID-MRSI at 14.1 T

Cristina Ramona Cudalbu Moldovan, Bernard Lanz, Dunja Simicic, Jessie Julie Mosso, Thanh Phong Kevin Lê, Guillaume Miro André Briand, Brayan Alves

Magnetic resonance spectroscopic imaging (MRSI) enables the simultaneous noninvasive acquisition of MR spectra from multiple spatial locations inside the brain. Although 1H-MRSI is increasingly used in the human brain, it is not yet widely applied in the p ...

2025

Noise-reduction techniques for 1H-FID-MRSI at 14.1 T: Monte Carlo validation and in vivo application

Cristina Ramona Cudalbu Moldovan, Bernard Lanz, Dunja Simicic, Jessie Julie Mosso, Thanh Phong Kevin Lê, Guillaume Miro André Briand, Brayan Alves

Proton magnetic resonance spectroscopic imaging (1H-MRSI) is a powerful tool that enables the multidimensional non-invasive mapping of the neurochemical profile at high resolution over the entire brain. The constant demand for higher spatial resolution in ...

Wiley2024

MP-PCA denoising for diffusion MRS data: promises and pitfalls

Cristina Ramona Cudalbu Moldovan, Dunja Simicic, Jessie Julie Mosso

Diffusion-weighted (DW) magnetic resonance spectroscopy (MRS) suffers from a lower signal to noise ratio (SNR) compared to conventional MRS owing to the addition of diffusion attenuation. This technique can therefore strongly benefit from noise reduction s ...

ACADEMIC PRESS INC ELSEVIER SCIENCE2022

Diffusion of brain metabolites highlights altered brain microstructure in type C hepatic encephalopathy: a 9.4 T preliminary study

Cristina Ramona Cudalbu Moldovan, Dunja Simicic, Katarzyna Pierzchala, Jessie Julie Mosso, Guillaume Miro André Briand

Introduction Type C hepatic encephalopathy (HE) is a decompensating event of chronic liver disease leading to severe motor and cognitive impairment. The progression of type C HE is associated with changes in brain metabolite concentrations measured by 1H m ...

Frontiers Media Sa2024

Contribution of macromolecules to brain H-1 MR spectra: Experts' consensus recommendations

Rolf Gruetter, Cristina Ramona Cudalbu Moldovan, Lijing Xin, Hongxia Lei, Dunja Simicic, Veronika Rackayová

Proton MR spectra of the brain, especially those measured at short and intermediate echo times, contain signals from mobile macromolecules (MM). A description of the main MM is provided in this consensus paper. These broad peaks of MM underlie the narrower ...

WILEY2020

Overview of oxidative stress findings in hepatic encephalopathy: From cellular and ammonium-based animal models to human data

Cristina Ramona Cudalbu Moldovan, Dunja Simicic

Oxidative stress is a natural phenomenon in the body. Under physiological conditions intracellular reactive oxygen species (ROS) are normal components of signal transduction cascades, and their levels are maintained by a complex antioxidants systems partic ...

ACADEMIC PRESS INC ELSEVIER SCIENCE2022

Late post‐natal neurometabolic development in healthy male rats using 1 H and 31 P Magnetic Resonance Spectroscopy

Rolf Gruetter, Cristina Ramona Cudalbu Moldovan, Veronika Rackayová, Guillaume Donati, Dunja Simicic

Brain metabolism evolves rapidly during early post‐natal development in the rat. While changes in amino acids, energy metabolites, antioxidants or metabolites involved in phospholipid metabolism have been reported in the early stages, neurometabolic change ...

2021

Central nervous system and systemic oxidative stress interplay with inflammation in a bile duct ligation rat model of type C hepatic encephalopathy

Rolf Gruetter, Cristina Ramona Cudalbu Moldovan, Andrzej Sienkiewicz, Dunja Simicic, Katarzyna Pierzchala, Stefanita-Octavian Mitrea

The role and coexistence of oxidative stress (OS) and inflammation in type C hepatic encephalopathy (C HE) is a subject of intense debate. Under normal conditions the physiological levels of intracellular reactive oxygen species are controlled by the count ...

2022

Diffusion-weighted SPECIAL improves the detection of J-coupled metabolites at ultrahigh magnetic field

Rolf Gruetter, Cristina Ramona Cudalbu Moldovan, Bernard Lanz, Dunja Simicic, Jessie Julie Mosso

PurposeTo improve the detection and subsequent estimation of the diffusion properties of strongly J-coupled metabolites in diffusion-weighted MRS (DWS).MethodsA new sequence for single-voxel diffusion-weighted 1H MR spectroscopy, named DW-SPECIAL, is propo ...

WILEY2023

In vivo macromolecule signals in rat brain 1 H‐MR spectra at 9.4T: Parametrization, spline baseline estimation, and T 2 relaxation times

Cristina Ramona Cudalbu Moldovan, Lijing Xin, Bernard Lanz, Dunja Simicic, Veronika Rackayová

Purpose Reliable detection and fitting of macromolecules (MM) are crucial for accurate quantification of brain short-echo time (TE) 1H-MR spectra. An experimentally acquired single MM spectrum is commonly used. Higher spectral resolution at ultra-high fiel ...

Wiley2021

A new rat model of creatine transporter deficiency reveals behavioral disorder and altered brain metabolism

Hirotaka Yamada, Maria del Carmen Sandi Perez, Cristina Ramona Cudalbu Moldovan, Dunja Simicic, Jocelin Grosse

Creatine is an organic compound used as fast phosphate energy buffer to recycle ATP, important in tissues with high energy demand such as muscle or brain. Creatine is taken from the diet or endogenously synthetized by the enzymes AGAT and GAMT, and specifi ...

Nature Research2021

Inhibition of urease-mediated ammonia production by 2-octynohydroxamic acid in hepatic encephalopathy

Cristina Ramona Cudalbu Moldovan, Dunja Simicic, Katarzyna Pierzchala, Stefanita-Octavian Mitrea

Hepatic encephalopathy is a neuropsychiatric complication of liver disease which is partly associated with elevated ammonemia. Urea hydrolysis by urease-producing bacteria in the colon is often mentioned as one of the main routes of ammonia production in t ...

Nature Portfolio2024

In Vivo Longitudinal 1H MRS Study of Hippocampal, Cereberal and Striatal Metabolic Changes in the Adult Brain Using an Animal Model of Chronic Hepatic Encephalopathy

Cristina Ramona Cudalbu Moldovan, Dunja Simicic, Katarzyna Pierzchala, Veronika Rackayová, Stefanita-Octavian Mitrea

LIPPINCOTT WILLIAMS & WILKINS2019

Central nervous system and systemic oxidative stress interplay with inflammation in a bile duct ligation rat model of type C hepatic encephalopathy (vol 178, pg 295, 2022)

Rolf Gruetter, Cristina Ramona Cudalbu Moldovan, Andrzej Sienkiewicz, Dunja Simicic, Katarzyna Pierzchala, Stefanita-Octavian Mitrea

ELSEVIER SCIENCE INC2022

The Beneficial Effect of Oral Cr Supplementation in an Early Childhood Rat Model of Chronic Hepatic Encephalopathy: In Vivo Longitudinal 1H and 31P Magnetic Resonance Spectroscopy Study

Cristina Ramona Cudalbu Moldovan, Dunja Simicic, Katarzyna Pierzchala, Stefanita-Octavian Mitrea

Lippincott Williams & Wilkins2023