Mauricio O Nava-Mesa

Universidad del Rosario | UR · Grupo de Investigación en Neurociencias (NEUROS)

Introduction Multiple sclerosis (MS) is a demyelinating disease of the central nervous system (CNS) that affects young adults, causing a variety of symptoms (motor alterations, visual alterations, loss of sphincter control, gait alterations) that impair the patient’s functional status. However, other symptoms, such as sexual dysfunction, can also h...

Pain is a complex sensory and emotional experience with nociceptive, nociplastic, and neuropathic components. An involvement of neurotropic B vitamins (B1 - thiamine, B6 - pyridoxine, and B12 - cyanocobalamin) as modulators of inflammation and pain has been long discussed. New evidence suggests their therapeutic potential in different pain conditio...

Background The new coronavirus, known as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) owing to its similarity to the previous severe acute respiratory syndrome (SARS), is characterized by causing, in most patients, nonspecific symptoms similar to those of the common flu. It has been reported that many coronavirus disease 2019 (COVID...

The G-protein-gated inwardly rectifying potassium (Kir3/GIRK) channel is the effector of many G-protein-coupled receptors (GPCRs). Its dysfunction has been linked to the pathophysiology of Down syndrome, Alzheimer's and Parkinson's diseases, psychiatric disorders, epilepsy, drug addiction, or alcoholism. In the hippocampus, GIRK channels decrease e...

Resumen El dolor lumbar, así como otras alteraciones musculoesqueléticas (cervicalgia, artrosis, etc.), son causa muy frecuente de consulta tanto en atención primaria como en otras especialidades hospitalarias y suelen asociarse con una alta discapacidad funcional y laboral. La lumbalgia aguda puede presentar diferentes componentes nociceptivos, ne...

The neurotropic B vitamins B1 (thiamine), B6 (pyridoxine), and B12 (cobalamin) are essential for proper functioning of the nervous system. Deficiencies may induce neuro-logical disorders like peripheral neuropathy (PN) and mainly occur in vulnerable populations (eg, elderly, diabetics, alcoholics). As epidemiologic cohort studies raised safety conc...

Recent evidence indicates that soluble amyloid-β (Aβ) species induce imbalances in excitatory and inhibitory transmission, resulting in neural network functional impairment and cognitive deficits during early stages of Alzheimer’s disease (AD). To evaluate the in vivo effects of two soluble Aβ species (Aβ25-35 and Aβ1-40) on commissural CA3-to-CA1...

G-protein-gated inwardly rectifying potassium (Kir3/GirK) channel is the effector of many G-protein-coupled receptors. Its dysfunction has been linked to the pathophysiology of Down syndrome, Alzheimer’s and Parkinson’s diseases, psychiatric disorders, epilepsy, drug addiction, or alcoholism. GirK channels are constitutively activated in the dorsal...

Introduction: Multiple sclerosis (MS) is a demyelinating disease of the central nervous system (CNS) that affects young adults, causing a variety of symptoms (motor alterations, visual alterations, loss of sphincter control, gait alterations) that impair the patient's functional status. However, other symptoms, such as sexual dysfunction, can also...

False lateralization of ictal onset by scalp electroencephalogram (EEG) is an infrequent entity that has been reported in patients with mesial temporal lobe epilepsy associated with hippocampal sclerosis (HS). In these cases, a tendency for rapid seizures that spread through the frontal-limbic system and hippocampal commissural pathways to the cont...

Toxoplasma gondii is an obligate intracellular parasite considered one of the most successful pathogens in the world, owing to its ability to produce long-lasting infections and to persist in the central nervous system (CNS) in most warm-blooded animals, including humans. This parasite has a preference to invade neurons and affect the functioning o...

Latin America has increased its share of world scientific publications by nearly twofold during the last two decades (approximately from 2 to 4%). Despite this positive trend, the scholarly impact of scientific research produced in the region - measured in terms of citation rate - remains low. Two interrelated factors that contribute to this situat...

Background: Cumulative evidence suggests an analgesic effect of thiamine, pyridoxine, and cyanocobalamin (TPC) in monotherapy, and also when combined with nonsteroidal anti-inflammatory drugs (NSAIDs), particularly diclofenac, in a synergistic manner. The aim of this review was to determine the effects of diclofenac combined with TPC compared with...

Background: Neurotropic B vitamins play crucial roles as coenzymes and beyond in the nervous system. Particularly vitamin B1 (thiamine), B6 (pyridoxine), and B12 (cobalamin) contribute essentially to the maintenance of a healthy nervous system. Their importance is highlighted by many neurological diseases related to deficiencies in one or more of...

Drug addiction is a chronic neuropsychiatric disorder that escalates from an initial exposure to drugs of abuse, such as cocaine, cannabis, or heroin, to compulsive drug-seeking and intake, reduced ability to inhibit craving-induced behaviors, and repeated cycles of abstinence and relapse. It is well-known that chronic changes in the brain’s reward...

Alzheimer’s disease i(AD) s the main cause of dementia and one of the great health-care challenges of the 21st century. Abnormally folded Aβ in amyloid plaques and neuronal tangles formed by hyperposphorilated tau protein are causally related to neurodegenerative processes in patients’ brains (1). Previous studies in our lab, have shown that AB25-3...

Alzheimer’s disease (AD) is the leading cause of dementia worldwide. It compromises patients’ daily activities owing to progressive cognitive deterioration, which has elevated direct and indirect costs. Although AD has several risk factors, aging is considered the most important. Unfortunately, clinical diagnosis is usually performed at an advanced...

Cognitive and emotional impairment are a serious consequence of stress exposure and are core features of neurological and psychiatric conditions that involve memory disorders. Indeed, acute and chronic stress are high-risk factors for the onset of posttraumatic stress disorder (PTSD) and Alzheimer's disease (AD), two devastating brain disorders ass...

Alzheimer's disease (AD) is the most common type of dementia, mainly encompassing cognitive decline in subjects aged ≥65 years. Further, AD is characterized by selective synaptic and neuronal degeneration, vascular dysfunction, and two histopathological features: extracellular amyloid plaques composed of amyloid beta peptide (Aβ) and neurofibrillar...

Alzheimer disease (AD) is a frequent and devastating neurodegenerative disease in humans, but still no curative treatment has been developed. Although many explicative theories have been proposed, precise pathophysiological mechanisms are unknown. Due to the importance of astrocytes in brain homeostasis they have become interesting targets for the...

The purpose of this article is to describe the clinical and electroencephalographic features of patients diagnosed with non-convulsive status epilepticus (NCSE) with uncommon cognitive and behavioral involvement. We present two cases with sub-acute cognitive impairment and neuropsychiatric disorders (including anxiety and transient behavioral chang...

Forty-one year old female admitted to the hospital because of symptoms and signs suggestive of pulmonary thromboembolism which was confirmed by CT angiography. There was no history of prior thromboembolic events, smoking, venous stasis or vascular lesion (negative lupus anticoagulant and anticardiolipins). The only documented hypercoagulability fac...

Forty-one year old female admitted to the hospital because of symptoms and signs suggestive of pulmonary thromboembolism which was confirmed by CT angiography. There was no history of prior thromboembolic events, smoking, venous stasis or vascular lesion (negative lupus anticoagulant and anticardiolipins). The only documented hypercoagulability fac...

p>El sistema opioide, del cual forman parte los péptidos opioides endógenos y sus receptores (Miu, Kappa, delta y ORL), tiene un papel importante en la fisiología de diferentes sistemas. Existe una creciente evidencia de su participación en la fisiopatología de múltiples trastornos del sistema nervioso central, endocrino e inmunológico. La modulaci...

Recibido para evaluación: 5 de noviembre de 2014. Aceptado para publicación: 11 de octubre de 2015. Resumen El sistema opioide, del cual forman parte los péptidos opioides endógenos y sus receptores (Miu, Kappa, delta y ORL), tiene un papel importante en la fisiología de diferentes sistemas. Existe una creciente evidencia de su participación en la...

Alzheimer's disease (AD) is a progressive neurodegenerative disease characterized by cognitive decline, brain atrophy due to neuronal and synapse loss, and formation of two pathological lesions: extracellular amyloid plaques, composed largely of amyloid-beta peptide (Aβ), and neurofibrillary tangles formed by intracellular aggregates of hyperphosph...

Alzheimer´s disease (AD) is known to be a neurodegenerative disease manifested as an inability to form new memories. Amyloid plaques and neurofibrillary tangles, formed by deposits of amyloid-β peptide (Aβ) and microtubule-binding protein tau respectively, represent the two neuropathological hallmarks of AD. These lesions mainly accumulate in brain...

Last evidences suggest that, in Alzheimer's disease (AD) early stage, Amyloid-β (Aβ) peptide induces an imbalance between excitatory and inhibitory neurotransmission systems resulting in the functional impairment of neural networks. Such alterations are particularly important in the septohippocampal system where learning and memory processes take p...

Transplants of embryonic nervous tissue ameliorate motor deficits induced by motor cortex lesions in adult animals. Restoration of lost brain functions has been recently shown in grafts of homotopic cortical origin, to be associated with a functional integration of the transplant after development of reciprocal host-graft connections. Nevertheless...

Objective: Lesions of the frontal cortex produce motor deficits which are evident at three months post-injury. The aim of this study was to investigate whether short-term rehabilitation in a critical period post-injury improves the deficit in motor ability produced by motor cortex lesions in adult rats. Additionally, we studied the expression of t...

Objective: We have previously shown the functional recovery of skilled forelimb use in rats after grafting of the frontal cortex lesion with cortical or amygdalar fetal tissue when rats were obliged to use the impaired limb. Here, we aimed to explore the effects of astrocyte grafts on the motor impairments caused by frontal cortex lesion in adult...

El sistema opioide –SO- (agonistas, antagonistas y sus receptores) tiene un importante papel en el procesamiento cognitivo. Los cambios en la eficiencia sináptica de aquellas estructuras cerebrales que participan en el procesamiento de la información explican parte de las bases neurobiológicas de la memoria. El SO afecta considerablemente la funció...