Publications by authors named "Jean- Noel Vallee"

Purpose: To highlight the influence of preocular and ocular vascular circulatory dynamics on the vascular density (VD) of retinal capillary plexuses (RCPs) and choriocapillaris (CC) in patients with and without cardiovascular risk (CVR) factors.

Methods: A retrospective observational study in patients with and without CVR factors (type 1 and 2 diabetes, arterial hypertension, and hypercholesterolemia). Fluorescein (FA) and indocyanine (ICGA) angiography circulatory times were arterial time (FA), start (FA) and end (FA) of laminar flow, and arterial time (ICGA), respectively.

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To investigate biomarkers of intra-ocular pressure (IOP) decrease after cataract surgery with trabecular washout in pseudo-exfoliative (PEX) glaucoma. A single-center observational prospective study in PEX glaucoma patients undergoing cataract surgery with trabecular washout (Goniowash) was performed from 2018 to 2021. Age, gender, visual acuity, IOP, endothelial cell count, central corneal thickness, medications, were collected over 16-month follow-up.

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  • The study explores the use of machine learning decision tree models to classify different types of brain tumors (lymphomas, glioblastomas, and metastases) using MRI data from 180 patients.
  • The models achieved high performance in classifying the tumors, with accuracy rates around 96% and significant predictive values, indicating effective differentiation based on various MRI parameters.
  • Key factors driving the decision-making process in the models were identified, highlighting the importance of tumor characteristics such as proliferation and tissue permeability, which can aid in personalized treatment approaches.
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Purpose Of Review: Recent research has shown that older people with high blood pressure (BP), or hypertension, are more likely to have biomarkers of Alzheimer's disease (AD). Essential hypertension represents the most common cardiovascular disease worldwide and is thought to be responsible for about 13% of all deaths. People with essential hypertension who regularly take prescribed BP medications are half as likely to develop AD as those who do not take them.

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The neuropsychiatric disease named obsessive-compulsive disorder is composed by obsessions and/or compulsions. Obsessive-compulsive disorder etiologies are undefined. However, numerous mechanisms in several localizations are implicated.

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  • The study evaluates a theoretical index, called the postural instability discrimination index (PI), for assessing postural instability in amyotrophic lateral sclerosis (ALS).
  • Key biomechanical factors influencing postural instability were identified, specifically the backward displacement of the pressure center (APA) and the active vertical braking of the mass center (Braking-index), which were incorporated into the PI formula.
  • The PI demonstrated strong discriminatory performance with high sensitivity (90.91%) and specificity (83.87%), indicating its potential as a reliable clinical tool for personalized assessment of postural instability in ALS patients.
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The canonical WNT/β-catenin pathway is upregulated in cancers and plays a major role in proliferation, invasion, apoptosis and angiogenesis. Nuclear β-catenin accumulation is associated with cancer. Hypoxic mechanisms lead to the activation of the hypoxia-inducible factor (HIF)-1α, promoting glycolytic and energetic metabolism and angiogenesis.

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Endometriosis is one of the major gynecological diseases of reproductive-age women. This disease is characterized by the presence of glands and stroma outside the uterine cavity. Several studies have shown the major role of inflammation, angiogenesis, adhesion and invasion, and apoptosis in endometriotic lesions.

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Gliomas are the main common primary intraparenchymal brain tumor in the central nervous system (CNS), with approximately 7% of the death caused by cancers. In the WHO 2016 classification, molecular dysregulations are part of the definition of particular brain tumor entities for the first time. Nevertheless, the underlying molecular mechanisms remain unclear.

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  • COVID-19 is caused by the SARS-CoV-2 virus and leads to a severe inflammatory response characterized by elevated cytokine levels, contributing to conditions like ARDS.
  • Recent research suggests that the WNT/β-catenin pathway is linked to this inflammation, while PPARγ plays a contrasting role in the immune response.
  • PPARγ agonists may help manage the cytokine storm in COVID-19 by increasing ACE2 expression, indicating their potential as a treatment option.
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Glaucoma is a progressive neurodegenerative disease that represents the major cause of irreversible blindness. Recent findings have shown which oxidative stress, inflammation, and glutamatergic pathway have main roles in the causes of glaucoma. Lithium is the major commonly used drug for the therapy of chronic mental illness.

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Glaucoma is a progressive neurodegenerative disease which constitutes the main frequent cause of irreversible blindness. Recent findings have shown that oxidative stress, inflammation and glutamatergic pathway play key roles in the causes of glaucoma. Recent studies have shown a down regulation of the WNT/β-catenin pathway in glaucoma, associated with overactivation of the GSK-3β signaling.

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  • Parkinson's disease (PD) is a significant neurodegenerative disorder characterized by the loss of dopamine-producing neurons, particularly in the substantia nigra, leading to various motor and cognitive issues.
  • Recent research highlights the roles of oxidative stress and inflammation in PD's progression, suggesting the need for new treatment options.
  • This review explores the potential of cannabidiol (CBD) as a therapeutic strategy for PD, particularly its ability to downregulate GSK-3β and activate the WNT/β-catenin pathway, which may help manage oxidative stress and inflammation in the disease.
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Obsessive-compulsive disorder (OCD) is a neuropsychiatric disorder characterized by recurrent and distinctive obsessions and/or compulsions. The etiologies remain unclear. Recent findings have shown that oxidative stress, inflammation, and glutamatergic pathways play key roles in the causes of OCD.

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Obsessive-compulsive disorder (OCD) is a neuropsychiatric disorder characterized b-y recurrent and distinctive obsessions and/or compulsions. The etiologies remain unclear. Recent findings have shown that oxidative stress, inflammation, and the glutamatergic pathway play key roles in the causes of OCD.

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Article Synopsis
  • Parkinson's disease (PD) is a progressive neurodegenerative disorder marked by the loss of dopamine-producing neurons, particularly in the substantia nigra, and linked to oxidative stress, inflammation, and glutamatergic pathways.
  • Research is ongoing to find effective treatments for PD, as current therapies are still uncertain.
  • The review suggests that lithium may be a promising therapeutic option, as it downregulates GSK-3beta, which could potentially help in controlling oxidative stress and inflammation through the activation of the WNT/β-catenin pathway, warranting further clinical trials.
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  • Intellectual abilities and clinical presentations in autism spectrum disorder (ASD) vary widely, and the causes of ASD are still not fully understood.
  • ASD is often linked to sleep disorders and involves complex biological rhythms that influence brain development and behavior.
  • Recent research highlights that the dysregulation of circadian rhythms affects the WNT/β-catenin signaling pathway, which may contribute to metabolic changes and cognitive issues in individuals with ASD.
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Introduction: Cerebral metabolism in obsessive-compulsive-disorder(OCD) has been the subject of numerous studies using proton magnetic resonance spectroscopy(MRS). Despite heterogeneous results, some studies have unraveled membrane turnover and energy metabolism abnormalities in different brain regions, suggesting that alterations in these processes may contribute to the pathophysiology. So far, no authors have explored phospholipids and high-energy phosphate metabolism using P-MRS, which allows in vivo quantification of phosphorus metabolites that are considered to be related to membrane turnover and energy metabolism.

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Alzheimer's disease (AD) is a neurodegenerative disease, where the etiology remains unclear. AD is characterized by amyloid-(Aβ) protein aggregation and neurofibrillary plaques deposits. Oxidative stress and chronic inflammation have been suggested as causes of AD.

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Parkinson's disease (PD) is one of the main neurodegenerative disease characterized by a progressive degeneration of neurons constituted by dopamine in the substantia nigra pars compacta. The etiologies of PD remain unclear. Aging is the main risk factor for PD.

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Age-related macular degeneration (AMD) is considered as the main worldwide cause of blindness in elderly adults. Exudative AMD type represents 10 to 15% of macular degeneration cases, but is the main cause of vision loss and blindness. Circadian rhythm changes are associated with aging and could further accelerate it.

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Numerous studies have presented that curcumin could have a positive effect in the prevention of cancer and then in tumor therapy. Several hypotheses have highlighted that curcumin could decreases tumor growth and invasion by acting on both chronic inflammation and oxidative stress. This review focuses on the interest of use curcumin in cancer therapy by acting on the WNT/β-catenin pathway to repress chronic inflammation and oxidative stress.

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Chronic inflammation and oxidative stress are common and co-substantial pathological processes accompanying and contributing to cancers. Numerous epidemiological studies have indicated that non-steroidal anti-inflammatory drugs (NSAIDs) could have a positive effect on both the prevention of cancer and tumor therapy. Numerous hypotheses have postulated that NSAIDs could slow tumor growth by acting on both chronic inflammation and oxidative stress.

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Entropy rate is increased by several metabolic and thermodynamic abnormalities in neurodegenerative diseases (NDs). Changes in Gibbs energy, heat production, ionic conductance or intracellular acidity are irreversible processes impelling modifications of the entropy rate. The present review focuses on the thermodynamic implications in the reprogramming of cellular energy metabolism enabling in Parkinson's disease (PD) through the contrasting interplay of the molecular signaling pathways WNT/ β-catenin and PPARγ.

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Atherosclerosis, a chronic inflammatory and age-related disease, is a complex mechanism presenting a dysregulation of vessel structures. During this process, the canonical WNT/β-catenin pathway is increased whereas PPARγ is downregulated. The two systems act in an opposite manner.

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