The effects of amiridin (9-amino-2,3,5,6,7,8-hexahydro-IH-cyclopenta(b) quinoline) and tacrine (1,2,3,4-tetrahydro-9-aminoacridine) on Schaffer collaterals--CAI field potentials were compared in rat hippocampal slice preparations. Similar dose-dependent increase in pop-spike amplitude was observed during slice perfusion with low concentrations of amiridin (5-50 microM) or tacrine (0.5-10 microM). This facilitation was not always fully reversible. The effect was accompanied by slight decrease in pop-EPSP amplitude suggesting membrane depolarization as a possible mechanism of pop-spike facilitation. Further increase in drug concentrations led to the depression and full blockade of pop-spike, that was associated with significant decrease in the pop-EPSP and fiber potential amplitudes. In contrast structurally related 4-aminopyridine evoked dose-dependent increase in both pop-EPSP and pop-spike amplitudes with all the concentrations tested (0.05-1000 microM), this facilitation was transformed into epileptiform response with 4-aminopyridine concentration about 500 microM. Possible mechanisms of drug actions on hippocampal neuron reactivity are discussed. It is suggested that amiridin might turn to be as effective as tacrine in symptomatic treatment of Alzheimer disease.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Resistant starch inhibits high-fat diet-induced oncogenic responses in the colon of C57BL/6 mice.
J Nutr Biochem
January 2025
United States Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, North Dakota 58203.
The beneficial effects of dietary fiber for colon health may be due to short chain fatty acids (SCFAs), such as butyrate, produced by colonic bacterial fermentation. In contrast, obesogenic diet induced obesity is linked to increased colon cancer incidence. We hypothesize that increasing fiber intake promotes healthy microbiome and reduces bacterial dysbiosis and oncogenic signaling in the colon of mice fed an obesogenic diet.
View Article and Find Full Text PDFAcute and chronic cannabis vapor exposure influences basal and stress-induced release of glucocorticoids in male and female rats.
Psychoneuroendocrinology
December 2024
Hotchkiss Brain Institute, Mathison Centre for Mental Health Research and Education, Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada; Department of Cell Biology and Anatomy & Psychiatry, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada. Electronic address:
Management of stress and anxiety is often listed as the primary motivation behind cannabis use. Human research has found that chronic cannabis use is associated with increased basal cortisol levels but blunted neuroendocrine responses to stress. Preclinical research has demonstrated mixed effects of Δ-tetrahydrocannabinol (THC; the psychoactive constituent of cannabis), much of which is suggestive of dose-dependent effects; however, the predominance of this work has employed an injection method to deliver cannabis.
View Article and Find Full Text PDFCentral Sleep Apnea and Cardiovascular Disease State-of-the-Art.
Sleep
December 2024
Midwest Cardiovascular Institute, Naperville, Illinois, USA.
Central sleep apnea (CSA), a rare polysomnographic finding in the general population, is prevalent in certain cardiovascular conditions including systolic and diastolic left ventricular dysfunction, atrial fibrillation, coronary artery disease, carotid artery stenosis, stroke and use of certain cardiac-related medications. Polysomnographic findings of CSA with adverse cardiovascular impacts include nocturnal hypoxemia and arousals, which can lead to increased sympathetic activity both at night and in the daytime. Among cardiovascular diseases, CSA is most prevalent in patients with left ventricular systolic dysfunction; a large study of more than 900 treated patients has shown a dose dependent relationship between nocturnal desaturation and mortality.
View Article and Find Full Text PDFBiomarkers.
Alzheimers Dement
December 2024
Wisconsin Alzheimer's Disease Research Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.
Background: Recent advances in Alzheimer's disease (AD) temporal biomarker modeling have revealed considerable heterogeneity in age at amyloid onset, and recently we and others identified sex and APOE differences in tau onset age and subsequent dementia development. Here we assessed whether amyloid burden, APOE-ε4 dose, and sex interact to predict estimated T+ onset age (ETOA).
Methods: Alzheimer's Disease Neuroimaging Initiative participants (N=911, Table 1) underwent serial PET imaging to quantify global cortical amyloid ([18F]Florbetapir SUVR, [18F]Florbetaben SUVR) and meta-temporal tau ([18F]Flortaucipir SUVR) burden.
Biomarkers.
Alzheimers Dement
December 2024
Wisconsin Alzheimer's Disease Research Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.
Background: Heavy alcohol consumption is associated with increased risk for Alzheimer's disease and related dementias (ADRD), with mixed evidence suggesting a dose-dependent nonlinear effect of alcohol on ADRD. Potential mechanisms by which alcohol may promote or attenuate brain pathology need further exploration. Although chronic alcohol consumption associates with gut microbiome alterations, it remains unclear whether microbial alterations mediate alcohol-associated neurodegeneration and cognitive decline.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!