Tomas Baka

Tomas Baka
Comenius University Bratislava · Institute of Pathological Physiology (Faculty of Medicine)

MD, PhD

About

34
Publications
3,411
Reads
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239
Citations
Introduction
Additional affiliations
April 2018 - August 2018
Boston University School of Medicine
Position
  • Researcher
Description
  • Colucci lab
Education
September 2014 - August 2018
Comenius University in Bratislava, School of Medicine
Field of study
  • Cardiovascular Medicine
September 2008 - June 2014
Comenius University in Bratislava, School of Medicine
Field of study
  • Medicine

Publications

Publications (34)
Article
Full-text available
Lactacystin is a specific proteasome inhibitor that blocks the hydrolysis of intracellular proteins by ubiquitin/proteasome system inhibition. The administration of lactacystin to rats induced hypertension and remodeling of the left ventricle and aorta. This study tested whether lactacystin induces structural and fibrotic rebuilding of the kidneys...
Article
Full-text available
This study investigated whether sacubitril/valsartan and ivabradine are able to prevent left ventricular (LV) fibrotic remodelling and dysfunction in a rat experimental model of spontaneous hypertension (spontaneously hypertensive rats, SHRs) and whether this potential protection is associated with RAAS alterations. Five groups of three-month-old m...
Article
Full-text available
The number of poorly controlled hypertensive patients worldwide is alarmingly high, and the introduction of antihypertensive drugs with principally novel mechanisms of action is not anticipated. Instead, better adherence to treatment, fixed antihypertensive drug combinations and careful self-monitoring are recommended. However, the chronotherapeuti...
Article
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Besides acute respiratory distress syndrome, acute cardiac injury is a major complication in severe coronavirus disease 2019 (COVID-19) and associates with a poor clinical outcome. Acute cardiac injury with COVID-19 can be of various etiologies, including myocardial ischemia or infarction and myocarditis, and may compromise cardiac function, result...
Article
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Background: Current heart failure (HF) therapies unload the failing heart without targeting the underlying problem of reduced cardiac contractility. Traditional inotropes (i.e. calcitropes) stimulate contractility via energetically costly augmentation of calcium cycling and worsen patient survival. A new class of agents - myotropes - activate the s...
Article
Background: It is well established that hearts with hypertrophic cardiomyopathy (HCM) are energy starved as reflected by a decreased phosphocreatine to ATP ratio that corresponds to increased ADP and decreased free energy of ATP hydrolysis (ΔG ~ATP ). Notably, worsened energetics precedes hypertrophy in development of HCM and mitochondrial mutation...
Article
Experimental and clinical studies from recent decades provided evidence supporting the hypothesis that the heart’s endocrine function is part of the neurohumoral network. The natriuretic peptide system consists of hormones generated by the myocardium having similar cardioprotective effects involved in cardiovascular homeostasis. During hemodynamic...
Article
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Arterial blood pressure (BP) undergoes variable changes over 24 hours conforming to physiological daily rhythms. Disruption of the natural BP circadian rhythm is associated with worsened cardiovascular disease (CVD) prognosis. Increased nocturnal BP or at least insufficient BP decline at night, i.e. non-dipping, may be associated with morphological...
Article
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Non-dipping heart rate (HR), i.e., HR decline overnight by <10% of the daytime mean, is coupled with an increased risk of adverse outcomes in the general population and various cardiovascular pathologies. Although sustained sympathetic over-activation at night is considered to be pivotal in the pathophysiology of non-dipping HR, other factors may a...
Article
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Angiotensin-converting enzyme 2 (ACE2) is the leading player of the protective renin-angiotensin system (RAS) pathway but also the entry receptor for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). RAS inhibitors seemed to interfere with the ACE2 receptor, and their safety was addressed in COVID-19 patients. Pedrosa et al. (Clin. Sci....
Article
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Despite advances in heart failure (HF) pharmacotherapy over the last three decades, the residual mortality with HF remains high. The antipode to the drug-induced inhibition of vasoconstrictive and proliferative substances could be an increase of vasodilative and antiproliferative humoral substances, including the natriuretic peptides (NPs). NPs are...
Article
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Elevated heart rate (HR) is a well-recognized but somewhat neglected risk factor among the healthy population and various cardiovascular pathologies. High HR is fraught with a spate of detrimental cardiovascular consequences including immense myocardial oxygen demand in reduced diastolic perfusion time and low, oscillatory vascular shear stress wit...
Article
Background: Sodium-glucose co-transporter 2 (SGLT2) inhibitors are antidiabetic drugs of great interest in cardiology due to their improvement of heart failure outcomes independent of diabetes. As SGLT2 is not expressed in cardiomyocytes, the mechanism of such benefit remains unclear. Elevated myocardial intracellular sodium [Na ⁺ ] i has been foun...
Article
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This study investigated whether ivabradine, a selective If current inhibitor reducing heart rate (HR), is able to improve survival and prevent left ventricular (LV) remodeling in isoproterenol‐induced heart damage. Wistar rats were treated for 6 weeks: controls (n = 10), ivabradine (10 mg/kg/day orally; n = 10), isoproterenol (5 mg/kg/day intraperi...
Article
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Hypertension-induced renal injury is characterized by structural kidney alterations and function deterioration. Therapeutics for kidney protection are limited, thus novel renoprotectives in hypertension are being continuously sought out. Ivabradine, an inhibitor of the I f current in the sinoatrial node reducing heart rate (HR), was shown to be of...
Article
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Metabolic heart disease (MHD), which is strongly associated with heart failure with preserved ejection fraction, is characterized by reduced mitochondrial energy production and contractile performance. In this study, we tested the hypothesis that an acute increase in ATP synthesis, via short chain fatty acid (butyrate) perfusion, restores contracti...
Article
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Calcium (Ca2+), an important second messenger, regulates many cellular activities and varies spatiotemporally within the cell. Conventional methods to monitor Ca2+ changes, such as synthetic Ca2+ indicators, are not targetable, while genetically encoded Ca2+ indicators (GECI) can be precisely directed to cellular compartments. GECIs are chimeric pr...
Article
Ivabradine decreases heart rate by selective inhibition of the If current in the sinoatrial node. Ivabradine is declared to have no direct effect on the autonomic nervous system (ANS). However, there are some data suggesting an (at least indirect) effect of ivabradine on the ANS. The pathomechanism behind is unclear. Based on the complex of plexuse...
Article
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Chronotherapy is a therapeutic approach that respects the circadian variations of physiological processes. The chronotherapeutic approach to hypertension has been shown to improve blood pressure (BP) control and reduce cardiovascular events. Chronotherapy might be of similar importance in the treatment of elevated heart rate (HR). The 2016 statemen...
Article
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This study investigated the effect of lisinopril (angiotensin-converting enzyme inhibi-tor) on potential behavioural alterations in spontaneously hypertensive rats (SHR). Three groups of 15-17-week-old rats were investigated for 2 weeks: Wistar control group, SHR group and SHR+lisinopril group. Systolic blood pressure (SBP) was normal in Wistar rat...
Article
We hypothesised that decreasing elevated night‐time heart rate (HR) in hypertension by administering a bradycardic agent (ivabradine) at bedtime could bring cardiovascular benefit. Since rats are nocturnal animals, they exhibit circadian rhythms phase‐shifted relative to humans. Sixty‐six Wistar rats were divided into nondiseased controls and rats...
Article
Full-text available
There is a great urgency of detecting and monitoring myocardial fibrosis in clinical practice with the aim to improve and personalize therapy against cardiac remodelling. Hence, the aim of this study was to describe alterations in and show potential correlations between the structural characteristics and the molecular and biochemical markers of car...
Article
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Cardiovascular pathologies are frequently associated with anxiety and other behavioral disturbances. Ivabradine, an inhibitor of the hyperpolarization-activated cyclic nucleotide-gated channels in the sinoatrial node, decreases heart rate and provides cardiovascular protection. Although ivabradine is increasingly used in cardiovascular medicine, th...
Article
Full-text available
Ivabradine, the selective inhibitor of the If current in the sinoatrial node, exerts cardiovascular protection by its bradycardic effect and potentially pleiotropic actions. However, there is a shortage of data regarding ivabradine’s interaction with the renin-angiotensin-aldosterone system (RAAS). This study investigated whether ivabradine is able...
Article
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This study investigated whether continuous light exposure (CLE) results in behavioural disturbances in rats and whether melatonin can modify these potential changes. Four groups of 3-month-old Wistar rats were treated as follows for six weeks: control, melatonin, CLE, and CLE with melatonin. CLE increased systolic blood pressure and melatonin reduc...
Article
No data are available on heart function in chronic testosterone deficiency and on the effect of estrogen treatment. Eighteen 4-week-old male Lewis rats were randomly divided into three groups (n = 6): one group of sham-operated rats and two groups of castrated rats. 66 weeks after surgery, one castrated group received a dose of 17β-estradiol (10 μg...
Article
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The renin-angiotensin-aldosterone system (RAAS) is a dominant player in several cardiovascular pathologies. This study investigated whether alterations induced by l-NAME, (NLG)-nitro-l-arginine methyl ester, a nitric oxide synthase inhibitor, and the protective effect of melatonin are associated with changes in the RAAS. Four groups of 3-month-old...
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Abstrakt: Aims: The mutual interrelation between cardiovascular diseases and anxiety disorder has been frequently discussed. The aim of this study was to show whether L-NAME (N[omega]-nitro-L-arginine methyl ester)-induced hypertension could induce behavioural disturbances in rats and whether these potential disorders could be modified by chronic t...
Article
Full-text available
Cardiovascular diseases including hypertension are often associated with behavioural alterations. The aim of this study was to show, whether ivabradine, the blocker of If-channel in sinoatrial node, is able to modify the behaviour of rats in L-nitro-arginine methyl ester (L-NAME)-induced hypertension and to compare the effect of ivabradine with cap...
Article
Full-text available
Elevated heart rate is a risk factor for cardiovascular and all-cause mortalities in the general population and various cardiovascular pathologies. Insufficient heart rate decline during the night, that is, nondipping heart rate, also increases cardiovascular risk. Abnormal heart rate reflects an autonomic nervous system imbalance in terms of relat...

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