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Nutrition: Calcium
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Total 48 results found since Jan 2013.
Differential effect of gold nanoparticles on cerebrovascular function and biomechanical properties
This study provides the first evidence that GNPs affect the structure and function of the cerebrovasculature, which may be important for their development and use in biomedical applications.
Source: Physiological Reports - August 22, 2023 Category: Physiology Authors: Ryan D. Hunt,
Omid Sedighi,
Wayne M. Clark,
Amber L. Doiron,
Marilyn J. Cipolla Tags: ORIGINAL ARTICLE Source Type: research
Repair of traumatic lesions to the plasmalemma of neurons and other cells: Commonalities, conflicts, and controversies
We describe current research gaps and potential future developments, such as much more extensive correlations of biochemical/biophysical measures with sub-cellular micromorphology. We compare and contrast naturally occurring sealing with recently-discovered artificially-induced plasmalemmal sealing by polyethylene glycol (PEG) that bypasses all natural pathways for membrane repair. We assess other recent developments such as adaptive membrane responses in neighboring cells following injury to an adjacent cell. Finally, we speculate how a better understanding of the mechanisms involved in natural and artificial plasmalemmal...
Source: Frontiers in Physiology - March 15, 2023 Category: Physiology Source Type: research
Carotid dysfunction in senescent female mice is mediated by increased α < sub > 1A < /sub > -adrenoceptor activity and COX-derived vasoconstrictor prostanoids
In conclusion, senescence intensifies vasoconstriction mediated by a1A-adrenergic signaling in the carotid of female mice by mechanisms involving increased iCa+2 and release of cyclooxygenase-derived prostanoids.PMID:36705993 | DOI:10.1152/ajpheart.00495.2022
Source: American Journal of Physiology. Heart and Circulatory Physiology - January 27, 2023 Category: Physiology Authors: Tiago J Costa Paula R Barros Diego A Duarte J úlio A Silva-Neto Sara Cristina Hott Thamyris Santos-Silva Claudio M Costa-Neto Felipe V Gomes Eliana H Akamine Cameron G McCarthy Francesc Jim énez-Altayó Ana Paula Dantas Rita C Tostes Source Type: research
Acetate suppresses myocardial contraction via the short-chain fatty acid receptor GPR43
The heart has high energy requirements, with an estimated 40%–60% of myocardial ATP production derived from the oxidation of fatty acids under physiological conditions. However, the effect of short-chain fatty acids on myocardial contraction remains controversial, warranting further research. The present study sought to investigate the effects and mechanisms of acetate, a short-chain fatty acid, on myocardial contraction in rat ventricular myocytes. Echocardiography and Langendorff heart perfusion were used to evaluate cardiac function. Cell shortening and calcium transient were measured in isolated cardiomyocytes. The p...
Source: Frontiers in Physiology - December 16, 2022 Category: Physiology Source Type: research
A thermodynamically consistent monte carlo cross-bridge model with a trapping mechanism reveals the role of stretch activation in heart pumping
Changes in intracellular calcium concentrations regulate heart beats. However, the decline in the left ventricular pressure during early diastole is much sharper than that of the Ca2+ transient, resulting in a rapid supply of blood to the left ventricle during the diastole. At the tissue level, cardiac muscles have a distinct characteristic, known as stretch activation, similar to the function of insect flight muscles. Stretch activation, which is a delayed increase in force following a rapid muscle length increase, has been thought to be related to autonomous control in these muscles. In this numerical simulation study, w...
Source: Frontiers in Physiology - September 8, 2022 Category: Physiology Source Type: research
Microglial Activation Modulated by P2X4R in Ischemia and Repercussions in Alzheimer ’s Disease
There are over 80 million people currently living who have had a stroke. The ischemic injury in the brain starts a cascade of events that lead to neuronal death, inducing neurodegeneration which could lead to Alzheimer’s disease (AD). Cerebrovascular diseases have been suggested to contribute to AD neuropathological changes, including brain atrophy and accumulation of abnormal proteins such as amyloid beta (Aβ). In patients older than 60 years, the incidence of dementia a year after stroke was significantly increased. Nevertheless, the molecular links between stroke and dementia are not clearly understood but could be r...
Source: Frontiers in Physiology - February 23, 2022 Category: Physiology Source Type: research
Hypoxic Regulation of the Large-Conductance, Calcium and Voltage-Activated Potassium Channel, BK
Hypoxia is a condition characterized by a reduction of cellular oxygen levels derived from alterations in oxygen balance. Hypoxic events trigger changes in cell-signaling cascades, oxidative stress, activation of pro-inflammatory molecules, and growth factors, influencing the activity of various ion channel families and leading to diverse cardiovascular diseases such as myocardial infarction, ischemic stroke, and hypertension. The large-conductance, calcium and voltage-activated potassium channel (BK) has a central role in the mechanism of oxygen (O2) sensing and its activity has been related to the hypoxic response. BK ch...
Source: Frontiers in Physiology - December 22, 2021 Category: Physiology Source Type: research
Physical and Physiologic Effects of Dobutamine Stress Echocardiography in Low-Gradient Aortic Stenosis
CONCLUSION: During DSE, aortic valve area increases with increase aortic valve gradient. Higher calcium score is associated with lower baseline aortic valve area, but the area valve area still increases with dobutamine even in presence of high calcium score.PMID:34860593 | DOI:10.1152/ajpheart.00183.2021
Source: American Journal of Physiology. Heart and Circulatory Physiology - December 3, 2021 Category: Physiology Authors: Kimi Sato Tom Kai Ming Wang Milind Y Desai Samir R Kapadia Amar Krishnaswamy L Leonardo Rodriguez Richard A Grimm Brian P Griffin Zoran B Popovic Source Type: research
