Javier de las Heras

ORCID: 0000-0001-5663-537X
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About
Contact & Profiles
Research Areas
  • Metabolism and Genetic Disorders
  • Diet and metabolism studies
  • Psychological Treatments and Disorders
  • Vitamin D Research Studies
  • Liver Disease Diagnosis and Treatment
  • Lysosomal Storage Disorders Research
  • Pancreatic function and diabetes
  • Diet, Metabolism, and Disease
  • Mitochondrial Function and Pathology
  • Folate and B Vitamins Research
  • Glycogen Storage Diseases and Myoclonus
  • Carbohydrate Chemistry and Synthesis
  • Vitamin C and Antioxidants Research
  • Amino Acid Enzymes and Metabolism
  • Aging, Health, and Disability
  • Psychology Research and Bibliometrics
  • Metabolomics and Mass Spectrometry Studies
  • Diabetes and associated disorders
  • Calcium signaling and nucleotide metabolism
  • Clinical Nutrition and Gastroenterology
  • Hyperglycemia and glycemic control in critically ill and hospitalized patients
  • Diabetes Treatment and Management
  • Obesity, Physical Activity, Diet
  • Adipose Tissue and Metabolism
  • Social Sciences and Policies

Hospital de Cruces
2016-2025

Centre for Biomedical Network Research on Rare Diseases
2009-2025

University of the Basque Country
2016-2025

BioCruces Health research Institute
2016-2025

Centro de Investigación Biomédica en Red
2019-2022

Centre Hospitalier Universitaire de Tours
2021

University Medical Center Groningen
2021

Inserm
2021

Université de Tours
2021

Instituto de Salud Carlos III
2019

We compared acylcarnitine (AcylCN) species, common amino acid and fat oxidation (FOX) byproducts, plasma acids in normal weight (NW; n = 39), obese (OB; 64), type 2 diabetic (n 17) adolescents.Fasting was analyzed by tandem mass spectrometry, body composition dual energy X-ray absorptiometry computed tomography, total-body lipolysis substrate [(2)H(5)]glycerol indirect calorimetry, respectively. In vivo insulin sensitivity (IS) assessed with a 3-h hyperinsulinemic-euglycemic clamp.Long-chain...

10.2337/dc11-1577 article EN cc-by-nc-nd Diabetes Care 2012-01-21

The aim of the study was to examine relationship between vitamin D status, total and abdominal adiposity, lipids in black white children.

10.1210/jc.2010-2388 article EN The Journal of Clinical Endocrinology & Metabolism 2011-03-03

Niemann-Pick type C (NPC) is a progressive neurodegenerative disease characterized by lysosomal/endosomal accumulation of unesterified cholesterol and glycolipids. Recent studies have shown that plasma cholestane-3β,5α,6β-triol (CT) 7-ketocholesterol (7-KC) could be potential biomarkers for the diagnosis NPC patients. We aimed to know sensitivity specificity these compared with other diseases can potentially lead oxysterol alterations. studied 107 controls 122 patients including 16 NPC, 3...

10.1194/jlr.m060343 article EN cc-by Journal of Lipid Research 2015-08-03

Hyperammonemia is a metabolic condition characterized by elevated levels of ammonia and common event in acute liver injury/failure chronic disease. Even though hepatic are potential predictive factors patient outcome, easy inexpensive methods aiming at the detection accumulation clinical setting remain unavailable. Thus, herein we have developed morphological method, based on utilization Nessler´s reagent, to accurately precisely detect biological tissue. We validated our method against...

10.1371/journal.pone.0173914 article EN cc-by PLoS ONE 2017-03-20

To examine the relationships between plasma 25-hydroxyvitamin D [25(OH)D] and in vivo insulin sensitivity β-cell function relative to sensitivity, disposition index (DI), black white youth.Plasma 25(OH)D concentrations were analyzed banked specimens healthy youth aged 8 18 years who had existing data on hyperinsulinemic-euglycemic hyperglycemic clamp assess secretion, measurements of body composition, abdominal visceral adipose tissue (VAT) subcutaneous (SAT).A total 183 research volunteers...

10.2337/dc11-1825 article EN cc-by-nc-nd Diabetes Care 2012-01-12

OBJECTIVE To 1) determine if plasma 25-hydroxyvitamin D (25[OH]D) concentrations differ among obese youth with normal glucose tolerance (NGT) versus prediabetes type 2 diabetes and 2) assess the relationships between 25(OH)D in vivo insulin sensitivity β-cell function this cohort. RESEARCH DESIGN AND METHODS Plasma were examined banked specimens 9- to 20-year-old (n = 175; male 42.3%, black 46.3%) (NGT, n 105; impaired [IGT], 43; diabetes, 27) who had secretion measured by...

10.2337/dc12-1288 article EN cc-by-nc-nd Diabetes Care 2013-01-23

BackgroundPropionic acidemia (PA) and methylmalonic (MMA) are inherited errors of metabolism affecting multiple organ systems. The Investigator Global Assessment Severity (IGA-S) instrument was developed to standardize PA MMA severity assessment.MethodsWe employed a 3-round Delphi panel survey methodology align on essential factors for assessing appropriate severity-level definitions. In online surveys, international panelists (n=6) with clinical research experience in PA/MMA assigned...

10.2139/ssrn.5069611 preprint EN 2025-01-01

Background/Objectives: The present study updates the Spanish registry of patients with urea cycle disorders (UCD), originally established in 2013, to provide comprehensive epidemiological data and evaluate impact therapeutic strategies newborn screening (NBS) on clinical outcomes. Methods: This retrospective, multicenter focuses 255 UCD patients. It includes all living deceased cases up February 2024, analyzing demographic, clinical, biochemical variables. Results: incidence Spain over past...

10.3390/nu17071173 article EN Nutrients 2025-03-28

To examine the cross-sectional relationship between blood pressure (BP) and (1) in vivo insulin sensitivity (IS) (2) circulating adiponectin levels overweight adolescents, to determine if these relationships are driven by adiposity.Sixty-five white pubertal adolescents underwent a hyperinsulinemic-euglycemic clamp measure IS. Body composition abdominal adiposity were determined dual energy X-ray absorptiometry computed tomography scan. BP was measured an automated sphygmomanometer every 10...

10.1159/000331462 article EN Hormone Research in Paediatrics 2011-01-01

Abstract Background Sebelipase alfa (Kanuma®) is approved for patients with Wolman disease (WD) at a dosage of 3–5 mg/kg once weekly. Survival rates in the second two clinical trials was greater, despite recruiting more severely ill patients, probably related to higher initial and maximal doses. We aimed evaluate effective pharmacokinetics pharmacodynamics when administered severe WD 5 twice weekly, an intensive regimen which not assessed trials. Methods recruited 3 receiving measured LAL...

10.1186/s13023-024-03219-5 article EN cc-by Orphanet Journal of Rare Diseases 2024-06-25
Annemiek M. J. van Wegberg Friedrich K. Trefz Maria Giżewska Sibtain Ahmed Layachi Chabraoui and 95 more Maha S. Zaki F. Maillot Francjan J. van Spronsen Kirsten Ahring Fuad Al Mutairi Jean‐Baptiste Arnoux Diana Ballhausen Julien Baruteau Larry Bernstein Sunita Bijarnia‐Mahay François Boemer Andrea Bordugo Lucia Brodosi Steve Brooks Hui Bein Chew Katarzyna Chyż Modupe O. Coker Catherine Collingwood Víctor Cornejo María L. Couce Alison Cozens S. Dahri Anibh M. Das Corinne De Laet Javier de las Heras A. de Vreugd François Guillaume Debray Marli Dercksen Maria Descartes Luísa Diogo Euridiki Drogari Hernán Eiroa Fatma Tuba Eminoğlu Greg Enns François Eyskens François Feillet Suzanne Ford Leifur Franzson Peter Freisinger Pedro Roberto Bandeira Garcia Olga Grafakou Gwendolyn Gramer Susan Gray Urh Grošelj Sarah C. Grünert Dorothea Haas Bedour Handoom T.B. Harte Christian J. Hendriksz R.S. Heredia Jozef Hertecant T. Hoi-Yee Wu Anita Inwood Saumya Shekhar Jamuar Pavel Ješina Jón J. Jónsson Aleksandar Jovanović Izabela Kern-Zdanowicz Sebile Kılavuz Ina Knerr Deniz Kör Dorota Korycińska-Chaaban Madara Kreile Burcu Kumru Brendan C. Lanpher Risto Lapatto Christian Lavigne Elisa Leão Teles Vincenzo Leuzzi Nicola Longo A. Lopez-Uriarte Charlotte M. A. Lubout Anita MacDonald Eman Megdad J. N. Mitchell Fanny Mochel Pedro Moreno A. Morris Carolina Fischinger Moura de Souza Tamara Muñoz Pasi I. Nevalainen Mikael Oscarson Katrin Õunap Sabrina Paci GM Pastores Phillip L. Pearl Flávia Piazzon James Pitt Gregory M.K. Poon Fulvio Porta N. Presner Abbas Rabaty Karit Reinson Péter Reismann Thomas Rink

Many countries do not have a newborn screening (NBS) program, and immigrants from such are at risk for late diagnosis of phenylketonuria (PKU). In this international survey, 52 259 patients (20%) with diagnosed PKU were immigrants, 145 the (55%) born before NBS or in location without NBS.

10.1016/j.jpeds.2021.08.070 article EN cc-by The Journal of Pediatrics 2021-08-30

Background and objectives: Glycerol phenylbutyrate (GPB) has demonstrated safety efficacy in patients with urea cycle disorders (UCDs) by means of its clinical trial program, but there are limited data practice. In order to analyze the GPB practice, here we present a national Spanish experience after direct switching from another nitrogen scavenger GPB. Methods: This observational, retrospective, multicenter study was performed 48 UCD (age 11.7 ± 8.2 years) 13 centers nine regions. Clinical,...

10.3390/jcm11175045 article EN Journal of Clinical Medicine 2022-08-28

Melatonin is synthesized from serotonin and it excreted as sulphatoxymelatonin in urine. We aim to evaluate urinary a biomarker of brain status cohort patients with mutations genes related biosynthesis. analized 65 healthy subjects 28 genetic defects. A total 18 were studied: 14 autosomal dominant recessive guanosine triphosphate cyclohydrolase-I deficiency; 3 sepiapterin reductase 1 aromatic L-amino acid decarboxylase deficiency. Further 11 studied after receiving serotoninergic treatment...

10.1038/s41598-017-15063-8 article EN cc-by Scientific Reports 2017-11-01

Hereditary fructose intolerance (HFI) is a rare inborn error of metabolism caused by the deficiency aldolase B. Since treatment consists fructose-, sucrose- and sorbitol-restrictive diet for life, patients are at risk presenting vitamin deficiencies. Although there no published data on status these vitamins in HFI patients, supplementation with C folic acid common. Therefore, aim this study was to assess folate practices nationwide cohort patients.Vitamin dietary intake, circulating levels...

10.1038/s41430-022-01178-3 article EN cc-by European Journal of Clinical Nutrition 2022-07-19
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