Life Sciences Commons^™

Neurometabolic And Electrophysiological Changes During Cortical Spreading Depolarization: Multimodal Approach Based On A Lactate-Glucose Dual Microbiosensor Arrays, Cátia F. Lourenço, Ana Ledo, Greg A. Gerhardt, João Laranjinha, Rui M. Barbosa

Center for Microelectrode Technology Faculty Publications

Spreading depolarization (SD) is a slow propagating wave of strong depolarization of neural cells, implicated in several neuropathological conditions. The breakdown of brain homeostasis promotes significant hemodynamic and metabolic alterations, which impacts on neuronal function. In this work we aimed to develop an innovative multimodal approach, encompassing metabolic, electric and hemodynamic measurements, tailored but not limited to study SD. This was based on a novel dual-biosensor based on microelectrode arrays designed to simultaneously monitor lactate and glucose fluctuations and ongoing neuronal activity with high spatial and temporal resolution. In vitroevaluation of dual lactate-glucose microbiosensor revealed an extended linear range, …

The Mechanistic Requirements Of Passive H+ Import Through The Na, K-Atpase, Kevin S. Stanley

Theses and Dissertations

This work focuses on the elucidation of the mechanism of passive proton import through the Na,K-ATPase. This enzyme uses the energy in ATP hydrolysis to exchange three intracellular Na+ for two extracellular K+ to maintain ion gradients within the cell, and while in the absence of physiological external Na+ and K+, the phosphorylated externally open (E2P) conformation passively imports protons, generating an inward current (IH). Chapter one reports on the effects of intracellular cations and nucleotides to shift the Na,K-ATPase into the E2P conformation. We identified that a combination of either internal Na+ and ATP or K+ and Pi. In …

Electrophysiological And Morphological Characterization Of Neurons In The Granular Retrosplenial Cortex, Andrew Nicholas Nye

Theses and Dissertations

The retrosplenial cortex (RSC) is a centrally located brain region that has reciprocal connections with several brain regions important for memory, including the prefrontal cortex, para-hippocampal region, hippocampal formation, and rhinal cortices. The RSC is also well connected with structures important for sensory processing, including the parietal cortex, thalamus, and visual cortices. Due to this connectivity, and early evidence that suggests the RSC plays a critical role in learning and memory, the region has recently gained much more research attention. Early studies found that patients with brain damage that includes the RSC have difficulty with verbal and visual information, retrieving …

Qt Prolongation Is Associated With Increased Mortality In End Stage Liver Disease, Sun Moon Kim, Bennet George, Diego Alcivar-Franco, Charles L. Campbell, Richard Charnigo, Brian P. Delisle, Jonathan Hundley, Yousef Darrat, Gustavo Morales, Samy-Claude Elayi, Alison L. Bailey

Internal Medicine Faculty Publications

AIM

To determine the prevalence of QT prolongation in a large series of end stage liver disease (ESLD) patients and its association to clinical variables and mortality.

METHODS

The QT interval was measured and corrected for heart rate for each patient, with a prolonged QT cutoff defined as QT > 450 ms for males and QT > 470 ms for females. Multiple clinical variables were evaluated including sex, age, serum sodium, international normalized ratio, creatinine, total bilirubin, beta-blocker use, Model for End-Stage Liver Disease (MELD), MELD-Na, and etiology of liver disease.

RESULTS

Among 406 ESLD patients analyzed, 207 (51.0%) had QT prolongation. …

Hydrogen Peroxide And Pharmacological Agent Modulation Of Trpv2 Channel Gating, Tuoxin Cao

Theses and Dissertations

Transient receptor potential vanilloid 2 channel (TRPV2) is a Ca²⁺-permeable ion channel that is highly expressed in leukocytes but is also present in skeletal and cardiac muscle and endocrine cells. The TRPV2 function is implicated in a number of physiological processes, including bacterial phagocytosis, pro-inflammatory cytokine production, cardiac hypertrophy, and cancer development. TRPV2 knockout mice exhibit a high incidence of perinatal mortality, arguing that the channel plays essential roles in physiology. Despite the importance of TRPV2 for normal homeostasis, the mechanisms that control TRPV2 gating in response to pharmacological agonists, heating, membrane stretch, bioactive lipids and reactive oxygen …