Publications by authors named "Libor Janousek"

The importance of macrophage polarization through atherogenesis is established. However, most studies rely on immunohistological approaches, which have several limitations, such as precluding comprehensive phenotypic analysis. The aim of this study was to perform an alternative analysis of macrophage phenotypes in advanced human atherosclerotic plaques and compare them with their presence in non-atherosclerotic arteries.

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Intravenous immunoglobulins (IVIG) are commonly used in peri-transplant desensitization, but evidence supporting their efficacy is limited. We conducted a prospective, randomized single-center, open-label, Phase IIIb non-inferiority clinical pilot trial to compare the efficacy of IVIG (administered at a dose of 3 × 0.5 g/kg) versus no IVIG, in conjunction with rabbit anti-thymocyte globulin (5-7 mg/kg) induction, in pre-sensitized patients with donor-specific antibodies who had negative pre-transplantation Flow- and CDC-crossmatches, between July 2020 and November 2022.

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Inflammatory changes in perivascular adipose tissue are associated with atherosclerotic lesions in the adjacent artery and can also be used as a marker in patient workup. While adipocyte size is known to be closely related to adipose tissue dysfunction and inflammation, it has not been widely studied in perivascular adipose tissue obtained from healthy human subjects without clinical atherosclerosis. In this cross-sectional study, we addressed this issue by measuring adipocyte size and defining its relationship to cardiovascular risk factors in a healthy cohort of living kidney donors.

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Atherosclerosis is a chronic inflammatory disease of the blood vessels caused by elevated levels of lipoproteins. The hyperlipoproteinemia triggers a series of cellular changes, particularly the activation of the macrophages, which play a crucial role in the development and progression of atherosclerosis. The presence of free cholesterol (FC) in lipoproteins may contribute to macrophage stimulation.

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Objectives: Vascular access (VA) stenoses play a significant role in the morbidity of the haemodialysed population. Classifications for diagnosis, assessment and proposal of treatment strategies can be useful clinical and methodological tools. This review aims to present a comprehensive summary and propose further methodological approaches.

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Background: Venotonics are a class of therapeutically active molecules that have vaso-protective effects. They are used to alleviate venous diseases and disorders, particularly venous insufficiency. We compared the composition of prescription versus over-the-counter (OTC) venotonics using high-performance liquid chromatography with UV detection (HPLC-DAD) and simulating their digestion using a static digestive model.

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Article Synopsis
  • Polyclonal rabbit antithymocyte globulins (ATGs) used in organ transplants can cause unwanted inflammation, while LIS1, a new generation of antilymphocyte globulins derived from genetically modified pigs, aims to reduce these risks.
  • A phase 1 study tested LIS1 in kidney transplant patients to assess its safety, T cell depletion effects, and pharmacokinetics.
  • Results indicated that LIS1 was well tolerated, effectively depleted T cells in certain dosage groups, and did not provoke severe side effects or the formation of antidrug antibodies.
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Article Synopsis
  • The study aimed to investigate the relationship between different macrophage subpopulations in arterial walls and adjacent adipose tissue in living kidney donors, focusing on early atherosclerosis.
  • Using flow cytometry and RT-PCR, researchers analyzed samples to determine how these macrophage groups were linked to cardiovascular risk factors.
  • Results showed specific macrophage subtypes were associated with cardiovascular risks, highlighting a connection between perivascular adipose tissue and the arterial wall, while visceral adipose tissue did not show the same link.
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Background: Transjugular intrahepatic portosystemic shunt (TIPS) is a method used to decrease portal hypertension. Biliary stricture is the rarest of the complications associated with this procedure with only 12 cases previously reported in the literature. None of these cases have documented the resolution of biliary stenosis induced by a stent graft.

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The authors present their contribution to the improvement of methods suitable for the detection of the freezing and thawing damage of cells of cryopreserved venous grafts used for lower limb revascularization procedures. They studied the post-thaw viability of cells of the wall of cryopreserved venous grafts (CVG) immediately after thawing and after 24 and 48 h culture at +37 °C in two groups of six CVG selected randomly for slow thawing in the refrigerator and rapid thawing in a water bath at +37 °C. The grafts were collected from multi-organ and tissue brain-dead donors, cryopreserved, and stored in a liquid nitrogen vapor phase for five years.

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Statins represent one of the most widely used classes of drugs in current medicine. In addition to a substantial decrease in atherogenic low density lipoprotein (LDL) particle concentrations, several large trials have documented their potent anti-inflammatory activity. Based on our preliminary data, we showed that statins are able to decrease the proportion of pro-inflammatory macrophages (CD14+16+CD36high) in visceral adipose tissue in humans.

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Introduction: Uterus transplantation (UTx) is a rapidly evolving treatment of uterine-factor infertility. We report the results of the first 10 UTx procedures performed at our institution.

Methods: The program started in April 2016 as a two-arm study comparing the efficacy of UTx from live donors (LD) and deceased donors (DD).

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Introduction: Acute early vascular complications are rare, but serious complications after kidney transplantation. They often result in graft loss. For this reason, shortening the diagnostic process is crucial.

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Introduction: A 72-year-old male patient was admitted into our centre with large infected pseudoaneurysm (PSA) in the left groin. The patient underwent a CT angiography (CTA) that confirmed a large partly thrombosed 6.5 × 5.

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Introduction: The rate of thawing of cryopreserved human iliac arteries allografts (CHIAA) directly affects the severeness of structural changes that occur during this process.

Method: The experiment was performed on ten CHIAA. The 10% dimethylsulphoxide in 6% hydroxyethyl starch solution was used as the cryoprotectant; all CHIAA were cooled at a controlled rate and stored in the vapor phase of liquid nitrogen (-194°C).

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Background: Nulliparous uterine grafts have never been used in uterus transplantation (UTx), possibly due to presumed infertility. Our objective was to verify the feasibility of nulliparous uterine graft transplantation.

Methods: The Czech Uterus Transplant Trial (registered under ClinicalTrials.

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In the original article, the following author name was incorrectly published and the corrected name is given below.

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Purpose: To assess the efficacy of percutaneous techniques in managing paediatric liver transplantation complications.

Material And Methods: We carried out 105 paediatric cadaveric donor liver transplantations at our centre from 2001 to 2018. Percutaneous techniques were used to treat 25 cases involving transplantation complications in 23 patients.

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Article Synopsis
  • Impaired energy production in heart tissue is common in cardiac diseases, prompting the need for an efficient way to assess mitochondrial function using small heart tissue samples.
  • This study utilized high-resolution respirometry to analyze fresh human cardiac muscle homogenates, demonstrating that this method is quicker and requires less tissue compared to traditional mitochondrial isolation techniques.
  • The findings indicate that the method provides reliable and reproducible results, with preserved mitochondrial integrity and comparable bioenergetics between atrial and ventricular heart tissue.
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Introduction: Desmoid tumours (DT) are commonly associated with Gardener's syndrome. Their surgical resection may be complicated by their close proximity to major vessels, multiple organ involvement, and frequent local recurrence. Multivisceral transplantation (MVTx) is an alternative treatment for patients with intestinal and liver failure.

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Background: Acute appendicitis in a solid organ transplant recipient is a rare occurrence, and experience remains limited. Appendicitis in uterine transplant recipients has never been reported. Immunocompromised patients with acute abdomen often present late and with attenuated symptoms.

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Background: Uterus transplantation is a complex, multi-step experimental procedure used for the treatment of uterus absence or uterus anomaly that prevents embryo implantation or pregnancy completion.

Method: To date, only 51 uterus transplants worldwide had been performed. When simplified, it is vascularized composite allograft transplantation.

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Background: The aim of our study was to assess the impact of different thawing protocols on morphological changes arising in cryopreserved human saphenous vein grafts.

Methods: The study was performed in 12 saphenous vein grafts harvested in brain death donors. Storage in the vapor phase of liquid nitrogen for 3 or 5 years followed.

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BACKGROUND Hepatic artery (HA) pseudoaneurysm (PSA) after liver transplantation (OLTx) is rare but often fatal complication requiring quick repair. Its prevalence in patients after OLTx is around 0.94%.

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Article Synopsis
  • Propofol significantly inhibits fatty acid oxidation and reduces mitochondrial function in human and rodent tissues, which may contribute to Propofol Infusion Syndrome.
  • The study involved the analysis of skeletal and cardiac muscle from Wistar rats and human subjects to explore the effects of various propofol concentrations on mitochondrial respiration and respiratory complex activity.
  • Results showed that human muscle and cardiac tissues are more affected by propofol than rat tissues, with lower concentrations needed to inhibit specific pathways, indicating a distinct mechanism of action affecting complex I and II in the electron transfer chain.
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