Inotropic and lusitropic effects of calcitonin gene-related peptide in the heart

Previous studies have demonstrated positive-inotropic effects of calcitonin gene-related peptide (CGRP), but the mechanisms remain unclear. Therefore, two experiments were performed to determine the physiological correlates of the positive-inotropic effects of CGRP. Treatments designed to antagonize the effects of physiologically active CGRP1–37 included posttreatment with CGRP8–37 and pretreatment with LY-294002 (LY, an inhibitor of phosphatidylinositol 3-kinase), 17β-estradiol (E), and progesterone (P) were also used to modulate the effects of CGRP1–37. Experiment 1 was in vitro studies on sarcomeres and cells of isolated adult rat cardiac myocytes. CGRP1–37, alone and in combination with E and P, decreased sarcomere shortening velocities and increased shortening percentages, effects that were antagonized by CGRP8–37, but not by LY. CGRP1–37 increased resting intracellular calcium ion concentrations and Ca2+ influxes, effects that were also antagonized by both CGRP8–37 and LY. Experiment 2 was in vivo studies on left ventricular pressure-volume (PV) loops. CGRP1–37 increased end-systolic pressure, ejection fraction, and velocities of contraction and relaxation while decreasing stroke volume, cardiac output, stroke work, PV area, and compliance. After partial occlusion of the vena cava, CGRP1–37 increased the slope of the end-systolic PV relationship. CGRP8–37 and LY attenuated most of the CGRP-induced changes....
Source: AJP: Heart and Circulatory Physiology - Category: Cardiology Authors: Tags: CARDIOVASCULAR NEUROHORMONAL REGULATION Source Type: research

Related Links:

I tried to kill my father for years. To be fair, I was following his wishes. He’d made it clear that when he no longer recognized me, when he could no longer talk, when the nurses started treating him like a toddler, he didn’t want to live any longer. My father was 58 years old when he was diagnosed with Alzheimer’s disease. He took the diagnosis with the self-deprecating humor he’d spent a lifetime cultivating, constantly cracking jokes about how he would one day turn into a zombie, a walking corpse. We had a good 10 years with him after the diagnosis. Eventually, his jokes came true. Seven years ...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized Alzheimer's Disease Source Type: news
AbstractPurpose of ReviewAtrial fibrillation (AF) is the most common arrhythmia in adults. The number of patients with AF is anticipated to increase annually, mainly due to the aging population alongside improved arrhythmia detection. AF is associated with a significantly elevated risk of hospitalization, stroke, thromboembolism, heart failure, and all-cause mortality. Echocardiography is one of the key components of routine assessment and management of AF. Therefore, the aim of this review is to briefly summarize current knowledge on “novel” echocardiographic parameters that may be of value in the management o...
Source: Current Cardiovascular Imaging Reports - Category: Radiology Source Type: research
Authors: Fan Q, Tao R, Zhang H, Xie H, Xi R, Wang F, Xu Y, Zhang R, Yan X, Gu G Abstract Inflammatory factors have specific value in acute myocardial infarction (AMI). Our previous studies have identified the prognostic value of interleukin (IL)-34 during chronic heart failure. However, the potential impact of IL-34 on AMI remains unknown.Serum IL-34 was measured in 287 AMI patients, and they were followed up for the composite endpoint, including cardiovascular death, heart failure hospitalization, recurrent nonfatal myocardial infarction (MI), and nonfatal stroke.IL-34 levels were significantly associated with the...
Source: International Heart Journal - Category: Cardiology Tags: Int Heart J Source Type: research
The impact of atrial fibrillation (AF) catheter ablation vs. chronic antiarrhythmic therapy alone on clinical outcomes such as death and stroke remains unclear. We compared adverse outcomes for AF ablation versus chronic antiarrhythmic therapy in 1070 adults with AF treated between 2010 and 2014 in the Kaiser Permanente Northern California and Southern California healthcare delivery systems. Patients undergoing AF catheter ablation were matched to patients treated with only antiarrhythmic medications, based on age, gender, history of heart failure, history of coronary heart disease, history of hypertension, history of diab...
Source: The American Journal of Cardiology - Category: Cardiology Authors: Source Type: research
The bioreactance technique is a relatively new, totally non-invasive technique used to measure cardiac output that is easy to use. Non Invasive Cardiac Output Monitor (NICOM) is one such system (Cheetah Medical Inc). Although approved by FDA for measurement of stroke volume, there is a paucity of literature validating this technology in decompensated heart failure and cardiogenic shock (CS).
Source: Journal of Cardiac Failure - Category: Cardiology Authors: Tags: Brief Report Source Type: research
Taking blood pressure pills at the right time halves the risk of heart failure, heart attack and stroke. → Support PsyBlog for just $4 per month. Enables access to articles marked (M) and removes ads. → Explore PsyBlog's ebooks, all written by Dr Jeremy Dean: Accept Yourself: How to feel a profound sense of warmth and self-compassion The Anxiety Plan: 42 Strategies For Worry, Phobias, OCD and Panic Spark: 17 Steps That Will Boost Your Motivation For Anything Activate: How To Find Joy Again By Changing What You Do
Source: PsyBlog | Psychology Blog - Category: Psychiatry & Psychology Authors: Tags: Blood Pressure Source Type: blogs
Fight Aging! publishes news and commentary relevant to the goal of ending all age-related disease, to be achieved by bringing the mechanisms of aging under the control of modern medicine. This weekly newsletter is sent to thousands of interested subscribers. To subscribe or unsubscribe from the newsletter, please visit: https://www.fightaging.org/newsletter/ Longevity Industry Consulting Services Reason, the founder of Fight Aging! and Repair Biotechnologies, offers strategic consulting services to investors, entrepreneurs, and others interested in the longevity industry and its complexities. To find out m...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
It is known that exposure to airborne particles, such as smoke from cooking fires, correlates with increased mortality due to cardiovascular disease. Setting aside commentary on wealth and its correlation with exposure to particulate air pollution, the obvious candidate mechanism is an increase in chronic inflammation due to the effects of inhaled particles on lung tissue. Raised inflammation then leads to an accelerated progression of atherosclerosis, the fatty deposits that narrow and weaken blood vessels, ultimately leading to heart failure, stroke, and heart attack. Researchers here provide epidemiological data to supp...
Source: Fight Aging! - Category: Research Authors: Tags: Daily News Source Type: blogs
This article explores the relationship between AF and HF and the thromboembolic effect of these diseases. Morbidity and mortality are increased when the 2 conditions are seen together. Stroke risks are significant with AF and all subtypes of HF. This article suggests that all patients with AF and HF should be considered for anticoagulation. Current evidence suggests that non –vitamin K antagonist oral anticoagulants are effective and safe in AF and HF in comparison with warfarin.
Source: Heart Failure Clinics - Category: Cardiology Authors: Source Type: research
We investigated a dilated cardiomyopathy (DCM) mutation (F764L) in human β-cardiac myosin by determining its motor properties in the presence and absence of the heart failure drug omecamtive mecarbil (OM). The mutation is located in the converter domain, a key region of communication between the catalytic motor and lever arm in myosins, and is nearby but not directly in the OM-binding site. We expressed and purified human β-cardiac myosin subfragment 1 (M2β-S1) containing the F764L mutation, and compared it to WT with in vitro motility as well as steady-state and transient kinetics measurements. In the absen...
Source: Journal of Biological Chemistry - Category: Chemistry Authors: Tags: Enzymology Source Type: research
More News: Calcium | Cardiology | Cardiovascular | Estradiol | Genetics | Heart | Heart Failure | Neurology | Physiology | Stroke | Study