Search results for "homeostasi"
showing 10 items of 636 documents
Superfood for axons: Glial exosomes boost axonal energetics by delivery of SIRT2
2021
Axon integrity depends on support by glia facilitating axonal maintenance and energy homeostasis, but the molecular mechanisms are not well understood. In this issue of Neuron, Chamberlain et al. (2021) provide evidence that oligodendrocyte-to-axon transfer of SIRT2 via extracellular vesicles (exosomes) enables deacetylation of mitochondrial proteins, enhancing axonal energy production.
ADIPOKINES IN CHILDREN WITH CHRONIC RENAL FAILURE
2015
Chronic Renal Failure (CRF) has negative impact on nutrition, growth, puberty, glycometabolic homeostasis, adipokines secretion. Adipokines play a role on these patients' short term complications and they influence their long term outcome. Many studies highlighted the influence of adipokines on cardiovascular complications, glycometabolic assess, nutrition of adults and children with CRF. High serum resistin and adiponectin levels can have a possible role in the development of protein-energy wasting among CRF patients. Elevated serum leptin levels were thought to contribute to the anorexia and poor nutrition in children on haemodialysis for CRF. Several studies have demonstrated leptin infl…
Levels of thrombopoietin in aqueous humor of patients with noninfectious acute anterior uveitis
2015
José-Juan Mondejar,1,4 David Salom,1,3 Salvador Garcia-Delpech,1,2 Manuel Diaz-Llopis11Ophthalmology Department, School of Medicine, University of Valencia, 2Ophthalmology Department, Hospital Universitario La Fe, 3Ophthalmology Department, Hospital de Manises, Valencia, 4Ophthalmology Department, Hospital General Universitario de Alicante, Alicante, SpainPurpose: To measure thrombopoietin (TPO) levels in the serum and aqueous humors of patients with noninfectious acute anterior uveitis.Methods: A prospective, comparative, controlled study. Serum and aqueous humors were obtained from the eyes of 16 patients with noninfectious acute anterior uveitis. TPO levels were measu…
Physiological and Nutritional Roles of PPAR across Species.
2013
There has been a tremendous amount of information produced on peroxisome proliferator-activated receptors (PPARs). The interest in PPARs was originally driven largely by their role in hypolipidemia and hepatocarcinogenesis, but it soon became evident that they played important roles in the metabolic syndrome and overall health of organisms including regeneration of tissues, differentiation, insulin signaling, overall lipid metabolism, and immune response (reviewed in [1–7]). From a nutritional standpoint, the PPARs are of extreme importance because of their ability to bind and be activated by long-chain fatty acids and their metabolites. Therefore, the PPARs are recognized as ideal candidat…
PPAR in Cardiovascular Disorders
2016
Peroxisome proliferation-activated receptors (PPARs) are ligand-inducible transcription factors that, upon binding their ligands, translocate into the nucleus, where they regulate transcription of numerous genes that have the peroxisome proliferator response element (PPRE) in the promoter region [1]. In humans, there are 3 PPAR isoforms: PPAR-α, PPAR-β/δ, and PPAR-γ. The isoforms have partially overlapping spectra of activity and are differently expressed in organs and tissues [2]. PPAR-α is expressed mostly in tissues characterized by high catabolic activity, including skeletal muscle, liver, proximal tubular cells in kidneys, and brown fat. This PPAR isoform regulates components of β-oxid…
Chatting Between the Brain and White Adipose Tissues
2012
Over the past decades, numerous papers have been published demonstrating the importance of the relationships between the brain and white adipose tissues in regard to body weight and metabolism regulation. Indeed the brain mainly via the sympathetic nervous system control body fat mass both by regulating adipocytes metabolism (lipolysis and lipogenesis), secretory activity (leptin and other adipokines) as well as development. In turn fat mass will send information to some brain areas via sensory nerves as well as via changes in metabolic and hormonal signals. Altogether these data are in support of a feedback loop between white adipose tissues and the brain. This crosstalk plays a major role…
Adaptation of neuronal cells to chronic oxidative stress is associated with altered cholesterol and sphingolipid homeostasis and lysosomal function
2009
Chronic oxidative stress has been causally linked to several neurodegenerative disorders. As sensitivity for oxidative stress greatly differs between brain regions and neuronal cell types, specific cellular mechanisms of adaptation to chronic oxidative stress should exist. Our objective was to identify molecular mechanisms of adaptation of neuronal cells after applying chronic sublethal oxidative stress. We demonstrate that cells resistant to oxidative stress exhibit altered cholesterol and sphingomyelin metabolisms. Stress-resistant cells showed reduced levels of molecules involved in cholesterol trafficking and intracellular accumulation of cholesterol, cholesterol precursors, and metabol…
The Homeostasis of Brain Choline
1993
The interest in the homeostasis of brain choline is reinforced by the role of choline as immediate precursor of acetylcholine, phosphatidylcholine and other phospholipids in the brain. In order to obtain a comprehensive view of the mochanisms of homeostasis it appeared necessary to elucidate the negative arteriovenous difference of choline across the brain (net release), a phenomenon that has been known for 20 years and is present in mammals and in man. This finding prompted an intense search for a de novo synthesis of choline in the brain. We detected in anaesthetized rats a reversal of the net release into a net uptake (positive arterio-venous difference), when the plasma level of choline…
Glucose Metabolism in Children With Growth Hormone Deficiency
2018
Background: The growth hormone (GH)/insulin-like growth factor 1 (IGF-1) axis has a fundamental impact on glucose metabolism. Therefore, both untreated GH deficiency (GHD) and GH treatment (GHT) may be associated with some metabolic alterations, although the abnormalities of glucose metabolism have been investigated by relatively few studies as main outcomes. Aim: The present review summarizes the available data on glucose metabolism in children with GHD, providing an overview of the current state of the art in order better to clarify the real metabolic impact of GHD and GHT. Methods: Among all the existing studies, we evaluated all original studies that fulfilled our criteria for analysis …
Reduced incidence of type 2 diabetes in patients with chronic hepatitis C virus infection cleared by direct-acting antiviral therapy: A prospective s…
2020
Aim HCV infection increases the risk of type 2 diabetes mellitus (T2DM). However, it remains still unclear whether HCV clearance by direct-acting antivirals (DAA) reduces T2DM. Therefore, the effect of HCV eradication on T2DM incidence was assessed. Methods A prospective multicenter case-control study was performed, which included 2,426 HCV patients, 42% of which with liver fibrosis F0-F2 and 58% F3-F4. Study population consisted of a control group including 1099 untreated patients and 1327 cases treated with DAA. T2DM incidence was assessed during a follow-up median period of 30 [IQR: 28-42] months. Risk factors of T2DM were assessed by Cox regression model (Relative risk (RR), Hazard risk…