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  1. Article ; Online: Reply to Radermacher et al. on "Serum Hydrogen Sulfide and Outcome Association in Pneumonia by the SARS-CoV-2 Coronavirus".

    Renieris, Georgios / Katrini, Konstantina / Giamarellos-Bourboulis, Evangelos J

    Shock (Augusta, Ga.)

    2020  Volume 55, Issue 1, Page(s) 139–140

    MeSH term(s) COVID-19 ; Coronavirus ; Humans ; Hydrogen Sulfide ; Pneumonia ; SARS-CoV-2
    Chemical Substances Hydrogen Sulfide (YY9FVM7NSN)
    Keywords covid19
    Language English
    Publishing date 2020-06-26
    Publishing country United States
    Document type Letter ; Comment
    ZDB-ID 1185432-7
    ISSN 1540-0514 ; 1073-2322
    ISSN (online) 1540-0514
    ISSN 1073-2322
    DOI 10.1097/SHK.0000000000001603
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Reply to Radermacher et al on "Serum Hydrogen Sulfide and Outcome Association in Pneumonia by the Sars-cov-2 Coronavirus"

    Renieris, Georgios / Katrini, Konstantina / Giamarellos-Bourboulis, Evangelos

    Shock (Augusta Ga.)

    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #32590691
    Database COVID19

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  3. Article ; Online: Experimental Intestinal Stenosis Alters Crohn's Disease-Like Intestinal Inflammation in Ileitis-Prone Mice.

    Georgopoulos, Ioannis / Mavrigiannaki, Eleftheria / Stasinopoulou, Sotiria / Renieris, Georgios / Nikolakis, Georgios / Bamias, Giorgos / Tiniakos, Dina / Papaconstantinou, Ioannis

    Digestive diseases and sciences

    2021  Volume 67, Issue 5, Page(s) 1783–1793

    Abstract: Background: Clinical observations indicate that mechanical factors contribute to the expression or recurrence of Crohn's disease. We investigated whether the creation of an intestinal stenosis could alter the severity of the expected Crohn-like ileitis, ...

    Abstract Background: Clinical observations indicate that mechanical factors contribute to the expression or recurrence of Crohn's disease. We investigated whether the creation of an intestinal stenosis could alter the severity of the expected Crohn-like ileitis, in a Crohn's disease animal model, the TNF
    Methods: Thirty-six, 6-weeks-old TNF
    Results: The triple suture stenosis induced significant muscular hypertrophy proximal to interventional site which was more prominent in TNF
    Conclusion: The creation of a stenosis in the terminal ileum of TNF
    MeSH term(s) Animals ; Constriction, Pathologic ; Crohn Disease/pathology ; Humans ; Ileitis/pathology ; Inflammation ; Intestinal Obstruction/etiology ; Mice ; Tumor Necrosis Factor-alpha/genetics ; Tumor Necrosis Factor-alpha/metabolism
    Chemical Substances Tumor Necrosis Factor-alpha
    Language English
    Publishing date 2021-08-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 304250-9
    ISSN 1573-2568 ; 0163-2116
    ISSN (online) 1573-2568
    ISSN 0163-2116
    DOI 10.1007/s10620-021-07161-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: An animal model of limitation of gut colonization by carbapenemase-producing Klebsiella pneumoniae using rifaximin.

    Xenofontos, Eleni / Renieris, Georgios / Kalogridi, Maria / Droggiti, Dionyssia-Eirini / Synodinou, Kalliopi / Damoraki, Georgia / Koufargyris, Panagiotis / Sabracos, Labros / Giamarellos-Bourboulis, Evangelos J

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 3789

    Abstract: Current knowledge suggests that infection by carbapenem-resistant enterobacteria is preceded by gut colonization. It is hypothesized that colonization is eradicated by non-absorbable antibiotics like rifaximin. We investigated the effect of rifaximin ... ...

    Abstract Current knowledge suggests that infection by carbapenem-resistant enterobacteria is preceded by gut colonization. It is hypothesized that colonization is eradicated by non-absorbable antibiotics like rifaximin. We investigated the effect of rifaximin against carbapenem-resistant Klebsiella pneumoniae (CRKP) in vitro and in a mouse model. We studied the in vitro efficacy of rifaximin against 257 CRKP clinical isolates, 188 KPC producers and 69 OXA-48 producers, by minimum inhibitory concentration and time-kill assays. We then developed a model of gut colonization by feeding 30 C57Bl6 mice with 10
    MeSH term(s) Ampicillin/pharmacology ; Ampicillin/therapeutic use ; Animals ; Anti-Bacterial Agents/pharmacology ; Anti-Bacterial Agents/therapeutic use ; Bacterial Proteins/pharmacology ; Carbapenem-Resistant Enterobacteriaceae ; Carbapenems/pharmacology ; Disease Models, Animal ; Klebsiella Infections/drug therapy ; Klebsiella Infections/microbiology ; Klebsiella pneumoniae ; Mice ; Mice, Inbred C57BL ; Microbial Sensitivity Tests ; Rifaximin/pharmacology ; Rifaximin/therapeutic use ; beta-Lactamases/pharmacology
    Chemical Substances Anti-Bacterial Agents ; Bacterial Proteins ; Carbapenems ; Ampicillin (7C782967RD) ; beta-Lactamases (EC 3.5.2.6) ; carbapenemase (EC 3.5.2.6) ; Rifaximin (L36O5T016N)
    Language English
    Publishing date 2022-03-08
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-07827-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Extracorporeal Membrane Oxygenation (ECMO)-Associated Coagulopathy in Adults.

    Frantzeskaki, Frantzeska / Konstantonis, Dimitrios / Rizos, Michail / Kitsinelis, Vasileios / Skyllas, Georgios / Renieris, Ioannis / Doumani, Maria / Kolias, Vasileios / Kefalidi, Eirini / Angouras, Dimitrios / Tsantes, Argyrios / Tsangaris, Iraklis

    Diagnostics (Basel, Switzerland)

    2023  Volume 13, Issue 23

    Abstract: Extracorporeal membrane oxygenation (ECMO) is used for the management of severe respiratory and cardiac failure and as a bridge to achieve definite treatment or transplantation. ECMO-associated coagulopathy (EAC) is a frequent complication leading to ... ...

    Abstract Extracorporeal membrane oxygenation (ECMO) is used for the management of severe respiratory and cardiac failure and as a bridge to achieve definite treatment or transplantation. ECMO-associated coagulopathy (EAC) is a frequent complication leading to high rates of thrombosis or severe haemorrhage, contributing to morbidity and mortality among patients. Understanding the pathophysiology of EAC is substantial for effectively managing patients on ECMO. We analyse the underlying mechanism of EAC and discuss the monitoring of the coagulation profile, combining the viscoelastic point-of-care assays with the conventional coagulation laboratory tests.
    Language English
    Publishing date 2023-11-21
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2662336-5
    ISSN 2075-4418
    ISSN 2075-4418
    DOI 10.3390/diagnostics13233496
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Association of Vitamin D with Severity and Outcome of COVID-19: Clinical and Experimental Evidence.

    Renieris, Georgios / Foutadakis, Spyros / Andriopoulou, Theano / Spanou, Victoria-Marina / Droggiti, Dionyssia-Eirini / Kafousopoulos, Dionysios / Gkavogianni, Theologia / Damoraki, Georgia / Vatsellas, Giannis / Giamarellos-Bourboulis, Evangelos J

    Journal of innate immunity

    2023  Volume 16, Issue 1, Page(s) 1–11

    Abstract: Introduction: The role of vitamin in COVID-19 remains controversial. We investigated the association between endogenous vitamin D and the severity of COVID-19 as well as the mechanisms of action of vitamin D supplementation.: Methods: 25(OH)D3 in ... ...

    Abstract Introduction: The role of vitamin in COVID-19 remains controversial. We investigated the association between endogenous vitamin D and the severity of COVID-19 as well as the mechanisms of action of vitamin D supplementation.
    Methods: 25(OH)D3 in serum was associated with disease severity and outcome in 190 COVID-19 patients. In a COVID-19 animal model using intravenous injection of plasma from patients with COVID-19 acute respiratory distress syndrome into C57/BL6 mice, mice were treated with 0.25 μg human 1,25(OH)D3 or vehicle. Mice were sacrificed on day 4. Cytokines and myeloperoxidase (MPO) in tissues were measured. Changes in gene expression after vitamin D supplementation were measured.
    Results: Vitamin D deficiency and insufficiency were associated with increased severity and unfavorable outcome after 28 days. Vitamin D levels were negatively associated with biomarkers of COVID-19 severity. Vitamin D supplementation after challenge of mice with COVID-19 plasma led to reduced levels of TNFα, IL-6, IFNγ, and MPO in the lung, as well as down-regulation of pro-inflammatory pathways.
    Conclusion: Normal levels of endogenous vitamin D are associated with reduced severity and risk of unfavorable outcome in COVID-19, possibly through attenuation of tissue-specific hyperinflammation.
    MeSH term(s) Humans ; Animals ; Mice ; Vitamin D/pharmacology ; COVID-19 ; Vitamins/therapeutic use ; Vitamin D Deficiency/drug therapy ; Vitamin D Deficiency/metabolism ; Biomarkers
    Chemical Substances Vitamin D (1406-16-2) ; Vitamins ; Biomarkers
    Language English
    Publishing date 2023-11-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2454158-8
    ISSN 1662-8128 ; 1662-811X
    ISSN (online) 1662-8128
    ISSN 1662-811X
    DOI 10.1159/000535302
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Experimental Models of Partial Intestinal Obstruction in Young Mice: Establishment, and Evaluation.

    Georgopoulos, Ioannis / Mavrigiannaki, Eleftheria / Stasinopoulou, Sotiria / Renieris, Georgios / Nikolakis, Georgios / Chaniotakis, Ioannis / Tiniakos, Dina / Papaconstantinou, Ioannis

    The Journal of surgical research

    2020  Volume 252, Page(s) 206–215

    Abstract: Background: Partial small bowel obstruction (SBO) is a common, potentially hazardous, surgical entity caused by numerous factors in humans. A number of techniques have been reported as efficient to simulate partial SBO in murine models. However, there ... ...

    Abstract Background: Partial small bowel obstruction (SBO) is a common, potentially hazardous, surgical entity caused by numerous factors in humans. A number of techniques have been reported as efficient to simulate partial SBO in murine models. However, there is little data concerning their long-term survival. Our study presents a novel technique and evaluates its long-term efficiency compared with other commonly used techniques.
    Materials and methods: Sixty C57BL/6 mice aged 6 to 8 wk were randomly divided into five intervention groups: ligation, intestinal ring, partial ligation, microclips, and the novel triple suture technique. The ring groups were subdivided into narrow, medium, and wide ring and partial ligation groups were subdivided at 1/3, 1/2, and 2/3 of the lumen. Survival cutoff time was set at 4 wk. Animals were then euthanized and small bowel muscle layer thickness was histopathologically evaluated.
    Results: None of the animals of the ligation and the ring groups reached the cutoff survival time. The mortality rate of the partial ligation and the microclips groups at the 4-week period were 33.3% and 0%, respectively. However, elimination of the performed intervention was revealed at the time of euthanasia and no alterations of the muscle layer were revealed at histopathology. The "triple suture" group had a survival rate of 90% until euthanasia and the sutures were apparent in all cases. Macroscopic evaluation showed small to mild proximal lumen dilatation in 6 of 10 animals. Histopathological evaluation of the specimens confirmed the partial obstruction.
    Conclusions: The "triple suture" technique is a new, robust, reliable, and inexpensive technique for experimental long-standing partial SBO, with very low mortality.
    MeSH term(s) Animals ; Disease Models, Animal ; Female ; Humans ; Intestinal Mucosa/pathology ; Intestinal Mucosa/surgery ; Intestinal Obstruction/etiology ; Intestinal Obstruction/pathology ; Intestinal Obstruction/physiopathology ; Intestine, Small/pathology ; Intestine, Small/physiopathology ; Intestine, Small/surgery ; Ligation/adverse effects ; Ligation/economics ; Male ; Mice ; Mice, Inbred C57BL ; Random Allocation ; Reproducibility of Results ; Suture Techniques/adverse effects ; Suture Techniques/education
    Language English
    Publishing date 2020-04-10
    Publishing country United States
    Document type Evaluation Study ; Journal Article
    ZDB-ID 80170-7
    ISSN 1095-8673 ; 0022-4804
    ISSN (online) 1095-8673
    ISSN 0022-4804
    DOI 10.1016/j.jss.2020.03.007
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Efficacy of tigecycline alone or in combination for experimental infections by KPC carbapenemase-producing Klebsiella pneumoniae.

    Fergadaki, Sotiria / Renieris, Georgios / Machairas, Nikolaos / Sabracos, Labros / Droggiti, Dionyssia-Irene / Misiakos, Evangelos / Giamarellos-Bourboulis, Evangelos J

    International journal of antimicrobial agents

    2021  Volume 58, Issue 3, Page(s) 106384

    Abstract: Although in vitro data suggest that tigecycline is active against Klebsiella pneumoniae carbapenemase-producing K. pneumoniae (KPC-Kp), experimental and clinical data are limited. We studied the effect of tigecycline alone or in combination for ... ...

    Abstract Although in vitro data suggest that tigecycline is active against Klebsiella pneumoniae carbapenemase-producing K. pneumoniae (KPC-Kp), experimental and clinical data are limited. We studied the effect of tigecycline alone or in combination for experimental infections by KPC-Kp. A total of 540 male C57BL/6 mice were infected with three genetically diverse KPC-Kp isolates susceptible to tigecycline with meropenem minimum inhibitory concentrations (MICs) of 4, 16 and 256 μg/mL, respectively. Mice were randomly treated with water for injection, tigecycline, meropenem and colistin alone, and double or triple combinations of tigecycline, colistin and meropenem. Mouse survival was recorded for 14 days. In separate experiments, mice were sacrificed 6 h and 24 h after bacterial challenge for quantitative culture of tissues and serological analysis. Time-kill curves were performed. Tigecycline, colistin and meropenem concentrations were measured in tissues and serum by high-performance liquid chromatography (HPLC). Survival was significantly prolonged when mice were treated with tigecycline alone and tigecycline-containing regimens compared with control mice and mice treated with tigecycline-sparing regimens. Tigecycline-sparing regimens were active only against the isolate with a meropenem MIC of 4 μg/mL. Mortality was associated with progression to multiple organ failure. Tigecycline and tigecycline-containing regimens achieved a rapid decrease of bacterial loads both in tissues and in vitro. Tigecycline concentrations in tissues were negatively correlated with tissue bacterial load. Tigecycline alone or in combination with meropenem and/or colistin achieves effective treatment of experimental KPC-Kp infections irrespective of the meropenem MIC.
    MeSH term(s) Animals ; Anti-Bacterial Agents/pharmacokinetics ; Carbapenem-Resistant Enterobacteriaceae/drug effects ; Colistin/pharmacokinetics ; Disease Models, Animal ; Drug Combinations ; Humans ; Klebsiella Infections/drug therapy ; Klebsiella pneumoniae/drug effects ; Male ; Meropenem/pharmacokinetics ; Mice ; Tigecycline/pharmacokinetics
    Chemical Substances Anti-Bacterial Agents ; Drug Combinations ; Tigecycline (70JE2N95KR) ; Meropenem (FV9J3JU8B1) ; Colistin (Z67X93HJG1)
    Language English
    Publishing date 2021-06-20
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1093977-5
    ISSN 1872-7913 ; 0924-8579
    ISSN (online) 1872-7913
    ISSN 0924-8579
    DOI 10.1016/j.ijantimicag.2021.106384
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Immunomodulation Through Beta-D-glucan in Chemically-induced Necrotizing Pancreatitis.

    Koliakos, Nikolaos N / Renieris, Georgios / Sotiropoulos, Dimitrios / Pavlou, Kalliopi / Droggiti, Dionysia-Eirini / Gkavogianni, Theologia / Charalampopoulos, Anestis / Giamarellos-Bourboulis, Evangelos J

    The Journal of surgical research

    2021  Volume 261, Page(s) 74–84

    Abstract: Background: Although the ability of β-D-glucan and monophosphoryl lipid A (MPLA) to modulate immune responses has been studied in human primary cells, their effect on sterile inflammation models such as necrotizing pancreatitis has never been ... ...

    Abstract Background: Although the ability of β-D-glucan and monophosphoryl lipid A (MPLA) to modulate immune responses has been studied in human primary cells, their effect on sterile inflammation models such as necrotizing pancreatitis has never been investigated.
    Materials and methods: 85 male New Zealand rabbits were assigned into following groups: A: control, B: pretreatment with β-D-glucan 3 d before pancreatitis, C: pretreatment with MPLA 3 d before pancreatitis, D: pretreatment with β-D-glucan and laminarin 3 d before pancreatitis, E: treatment with β-D-glucan 1 d after pancreatitis, and F: MPLA 1 d after pancreatitis. Pancreatitis was induced by sodium taurocholate injection into the pancreatic duct and parenchyma. Survival was recorded for 21 d. On days 1, 3, and 7, blood was collected for amylase measurement. Peripheral blood mononuclear cells were isolated and stimulated for tumor necrosis factor alpha and interleukin 10 production. Pancreatic necrosis and tissue bacterial load were assessed.
    Results: 21-d survival was prolonged after pretreatment or treatment with β-D-glucan; this benefit was lost with laminarin administration. At sacrifice, pancreatic inflammatory alterations were more prominent in the control group. Bacterial load was lower after pretreatment or treatment with β-D-glucan and MPLA. Tumor necrosis factor alpha production from stimulated peripheral blood mononuclear cells was significantly decreased, whereas interleukin 10 production remained unaltered after pretreatment or treatment with β-D- glucan.
    Conclusions: β-D-glucan reduces mortality of experimental pancreatitis in vivo. This is mediated through attenuation of cytokine production and prevention of bacterial translocation.
    MeSH term(s) Adjuvants, Immunologic/pharmacology ; Adjuvants, Immunologic/therapeutic use ; Amylases/blood ; Animals ; Bacterial Translocation/drug effects ; Drug Evaluation, Preclinical ; Glucans ; Immunomodulation ; Lipid A/analogs & derivatives ; Lipid A/pharmacology ; Lipid A/therapeutic use ; Male ; Pancreatitis, Acute Necrotizing/blood ; Pancreatitis, Acute Necrotizing/drug therapy ; Pancreatitis, Acute Necrotizing/mortality ; Proteoglycans/pharmacology ; Proteoglycans/therapeutic use ; Rabbits ; Taurocholic Acid ; Tumor Necrosis Factor-alpha/metabolism
    Chemical Substances Adjuvants, Immunologic ; Glucans ; Lipid A ; Proteoglycans ; Tumor Necrosis Factor-alpha ; polysaccharide-K (3X48A86C8K) ; Taurocholic Acid (5E090O0G3Z) ; laminaran (9008-22-4) ; Amylases (EC 3.2.1.-) ; monophosphoryl lipid A (MWC0ET1L2P)
    Language English
    Publishing date 2021-01-07
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80170-7
    ISSN 1095-8673 ; 0022-4804
    ISSN (online) 1095-8673
    ISSN 0022-4804
    DOI 10.1016/j.jss.2020.12.020
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Extracorporeal Membrane Oxygenation (ECMO)-Associated Coagulopathy in Adults

    Frantzeska Frantzeskaki / Dimitrios Konstantonis / Michail Rizos / Vasileios Kitsinelis / Georgios Skyllas / Ioannis Renieris / Maria Doumani / Vasileios Kolias / Eirini Kefalidi / Dimitrios Angouras / Argyrios Tsantes / Iraklis Tsangaris

    Diagnostics, Vol 13, Iss 23, p

    2023  Volume 3496

    Abstract: Extracorporeal membrane oxygenation (ECMO) is used for the management of severe respiratory and cardiac failure and as a bridge to achieve definite treatment or transplantation. ECMO-associated coagulopathy (EAC) is a frequent complication leading to ... ...

    Abstract Extracorporeal membrane oxygenation (ECMO) is used for the management of severe respiratory and cardiac failure and as a bridge to achieve definite treatment or transplantation. ECMO-associated coagulopathy (EAC) is a frequent complication leading to high rates of thrombosis or severe haemorrhage, contributing to morbidity and mortality among patients. Understanding the pathophysiology of EAC is substantial for effectively managing patients on ECMO. We analyse the underlying mechanism of EAC and discuss the monitoring of the coagulation profile, combining the viscoelastic point-of-care assays with the conventional coagulation laboratory tests.
    Keywords extracorporeal membrane oxygenation ; coagulation ; immunothrombosis ; viscoelastic tests ; Medicine (General) ; R5-920
    Language English
    Publishing date 2023-11-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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