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Bayyurt B, Akın Ş, Özbilüm Şahin N, Yelkuvan İ. Association between NKILA and some apoptotic gene expression in atherosclerosis. PeerJ 2024; 12:e17915. [PMID: 39184397 PMCID: PMC11344533 DOI: 10.7717/peerj.17915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Accepted: 07/23/2024] [Indexed: 08/27/2024] Open
Abstract
Oxidized light-density lipoprotein (ox-LDL) causes endothelial dysfunction, which is an important determinant of atherogenesis, and subsequently leads to apoptosis. Atherosclerosis is one of the most significant cardiovascular diseases (CVDs) threatening human health and causes death worldwide. Recently, long noncoding RNAs (lncRNAs) have been suggested to involved in vascular biology. Ox-LDL activates nuclear factor kappa-B (NF-κB), and NF-κB interacting lncRNA (NKILA) inhibits NF-κB signaling. In this study, the hypothesis is that NKILA may regulate endothelial cell (EC) apoptosis and, therefore, play a role in the pathogenesis of atherosclerosis. This hypothesis is based on the knowledge that EC apoptosis contributes to atherosclerosis development and that NKILA has become a prominent lncRNA in CVDs. The expression of Bcl-2-associated X protein (BAX), caspase 9 (CASP9), cytochrome c (Cyt c, CYCS), apoptotic protease activating factor 1 (APAF1), and B-cell lymphoma 2 (BCL-2) genes in human umbilical vein endothelial cells (HUVEC) treated with ox-LDL and transfected with NKILA siRNA was analyzed using quantitative reverse transcription polymerase chain reaction (RT-qPCR). BAX, CASP9, CYCS, APAF1, and BCL-2 gene expression was downregulated in ox-LDL and NKILA siRNA-treated HUVEC. In addition, when threshold/quantification cycle (Cq) values of NKILA gene expression increased, Cq values of BAX, CASP9, APAF1, and BCL-2 gene expression increased statistics significantly. The expression detection of all these genes, resulting from NKILA gene silencing, may provide guidance for epigenetic studies on EC apoptosis in atherosclerosis.
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Affiliation(s)
- Burcu Bayyurt
- Department of Medical Biology, Faculty of Medicine, Sivas Cumhuriyet University, Sivas, Turkey
| | - Şeyda Akın
- Department of Medical Biology, Faculty of Medicine, Sivas Cumhuriyet University, Sivas, Turkey
| | - Nil Özbilüm Şahin
- Department of Molecular Biology and Genetics, Faculty of Science, Sivas Cumhuriyet University, Sivas, Turkey
| | - İzzet Yelkuvan
- Department of Medical Biology, Faculty of Medicine, Sivas Cumhuriyet University, Sivas, Turkey
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Yasuma T, Gabazza EC. Cell Death in Acute Organ Injury and Fibrosis. Int J Mol Sci 2024; 25:3930. [PMID: 38612740 PMCID: PMC11012379 DOI: 10.3390/ijms25073930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2024] [Accepted: 03/25/2024] [Indexed: 04/14/2024] Open
Abstract
Tissue fibrosis is characterized by the excessive accumulation of extracellular matrix in various organs, including the lungs, liver, skin, kidneys, pancreas, and heart, ultimately leading to organ failure [...].
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Affiliation(s)
- Taro Yasuma
- Department of Immunology, Mie University Faculty and Graduate School of Medicine, Edobashi 2-174, Tsu 514-8507, Japan;
- Department of Diabetes and Endocrinology, Mie University Faculty and Graduate School of Medicine, Edobashi 2-174, Tsu 514-8507, Japan
| | - Esteban C. Gabazza
- Department of Immunology, Mie University Faculty and Graduate School of Medicine, Edobashi 2-174, Tsu 514-8507, Japan;
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THE EFFECT OF DEXAMETHASONE ON HEMATOLOGIC PROFILES, HEMOSPORIDIAN INFECTION, AND SPLENIC HISTOLOGY IN HOUSE FINCHES (HAEMORHOUS MEXICANUS). J Wildl Dis 2022; 58:512-523. [PMID: 35704503 DOI: 10.7589/jwd-d-21-00129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 03/11/2022] [Indexed: 11/20/2022]
Abstract
Research on host response to infectious disease often involves pharmacological induction of immunosuppression, frequently through administration of dexamethasone. Reports on the effect of dexamethasone in birds are largely restricted to poultry and pigeons. This study describes changes in white blood cell (WBC) differentials, hemoparasite counts, splenic histology, and splenic CD3 immunoreactivity in House Finches (Haemorhous mexicanus). Experimental group birds (n=9) were treated with a daily intramuscular injection of 25 µg of dexamethasone for 8 d; a control group (n=9) received daily saline solution. Smears were made with blood collected immediately before the first dose (day 0) and on d 4, 8, and 9, and stained with modified Wright. The WBC differential counts were performed by three blinded observers, parasite counts by two blinded observers, and histology by one blinded observer. Dexamethasone-treated birds experienced relative heterophilia and lymphopenia on d 4 (P=0.008); heterophilia was also present at d 8 (P=0.018). Hemosporidian counts were significantly increased in dexamethasone-treated birds on d 4 and 8 (P=0.048 and P=0.031, respectively). In contrast with control birds, all dexamethasone-treated birds lacked histologically apparent splenic lymphoid follicles (P<0.001). No significant difference was observed in splenic CD3 immunoreactivity between groups. Our results indicate that dexamethasone has an effect on the hematologic profile of House Finches and suggest that it may be a useful method to induce immunosuppression in this species.
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Zhou Q, Li D, Zhang S, Wang S, Hu X. Quantum dots bind nanosheet to promote nanomaterial stability and resist endotoxin-induced fibrosis and PM 2.5-induced pneumonia. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 234:113420. [PMID: 35298970 DOI: 10.1016/j.ecoenv.2022.113420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 03/07/2022] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
Endotoxin lipopolysaccharide (LPS) is a harmful substance commonly found in various environments that causes lung fibrosis. Exposure to PM2.5 also increases the risk of respiratory diseases. Through sulfur-carbon bonds and the edge S effect, GOQDs were used to bind in single-layer molybdenum disulfide (SLMoS2) nanosheets to synthesize SLMoS2@GOQDs heterojunction structures. GOQDs doping greatly increased the water solubility and stabilized of SLMoS2. SLMoS2@GOQDs with catalase-like activity protected cells from ultrastructural and cytomembrane damage and apoptosis induced by LPS. Moreover, the doping of GOQDs enhanced the escape of SLMoS2@GOQDs from cellular uptake and suppressed the release of Mo ions. Nanosheet-cell interface interactions that were regulated by quantum dots supported these positive effects. Immunofluorescence analysis and cell imaging confirmed that the nanomaterial protected against cell injury by regulating the canonical Wnt/β-catenin pathway and the secretion of relevant cytokines, such as interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α). Moreover, SLMoS2@GOQDs also mitigated pneumonia caused by PM2.5 in vivo. Collectively, our findings not only provide a simple and effective approach to control lung diseases (caused by LPS or PM2.5), but also reveal the potential value of heterojunction materials in the fields of toxicology and human health, boosting the application of nanotechnology in the fields of ecotoxicology and environmental safety.
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Affiliation(s)
- Qixing Zhou
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
| | - Dandan Li
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
| | - Suyan Zhang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
| | - Simin Wang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
| | - Xiangang Hu
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
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Abstract
There is abundant evidence that infectious sepsis both in humans and mice with polymicrobial sepsis results in robust activation of complement. Major complement activation products involved in sepsis include C5a anaphylatoxin and its receptors (C5aR1 and C5aR2) and, perhaps, the terminal complement activation product, C5b-9. These products (and others) also cause dysfunction of the innate immune system, with exaggerated early proinflammatory responses, followed by decline of the innate immune system, leading to immunosuppression and multiorgan dysfunction. Generation of C5a during sepsis also leads to activation of neutrophils and macrophages and ultimate appearance of extracellular histones, which have powerful proinflammatory and prothrombotic activities. The distal complement activation product, C5b-9, triggers intracellular Ca fluxes in epithelial and endothelial cells. Histones activate the NLRP3 inflammasome, products of which can damage cells. C5a also activates MAPKs and Akt signaling pathways in cardiomyocytes, causing buildup of [Ca]i, defective action potentials and substantial cell dysfunction, resulting in cardiac and other organ dysfunction. Cardiac dysfunction can be quantitated by ECHO-Doppler parameters. In vivo interventions that block these complement-dependent products responsible for organ dysfunction in sepsis reduce the intensity of sepsis. The obvious targets in sepsis are C5a and its receptors, histones, and perhaps the MAPK pathways. Blockade of C5 has been considered in sepsis, but the FDA-approved antibody (eculizumab) is known to compromise defenses against neisseria and pneumonococcal bacteria, and requires immunization before the mAb to C5 can be used clinically. Small molecular blocking agents for C5aRs are currently in development and may be therapeutically effective for treatment of sepsis.
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Savran M, Aslankoc R, Ozmen O, Erzurumlu Y, Savas HB, Temel EN, Kosar PA, Boztepe S. Agomelatine could prevent brain and cerebellum injury against LPS-induced neuroinflammation in rats. Cytokine 2019; 127:154957. [PMID: 31869757 DOI: 10.1016/j.cyto.2019.154957] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 12/06/2019] [Accepted: 12/13/2019] [Indexed: 02/08/2023]
Abstract
Sepsis, systemic hyper-inflammatory immune response, causes the increase of morbidity and mortality rates due to multi-organ diseases such as neurotoxicity. Lipopolysaccharide (LPS) induces inflammation, oxidative stress and apoptosis to cause brain damage. We aimed to evaluate the antioxidant, anti-inflammatory and antiapoptotic effects of Agomelatine (AGM) on LPS induced brain damage via NF-kB signaling. Twenty-four animals were divided into three groups as control, LPS (5 mg/kg) and LPS + AGM (20 mg/kg). Six hours after the all administrations, rats were sacrificed, brain tissues were collected for biochemical, histopathological and immunohistochemical analysis. In LPS group; total oxidant status (TOS), OSI index, Caspase-8 (Cas-8), NF-kß levels increased and Total antioxidant status (TAS) levels decreased biochemically and Cas-8, haptoglobin and IL-10 expressions increased and sirtuin-1 (SIRT-1) levels decreased immunohistochemically. AGM treatment reversed these parameters except haptoglobin levels in hippocampus and SIRT-1 levels in cerebellum. Besides, AGM treatment blocked the phosphorylation of NF-kB biochemically and ameliorated increased the levels of hyperemia, edema and degenerative changes histopathologically. In conclusion, AGM enhanced SIRT-1 levels to negatively regulate the transcription and activation of p-NF-kB/p65 which caused to ameliorate inflammation, oxidative stress and apoptosis.
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Affiliation(s)
- M Savran
- Department of Pharmacology, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey.
| | - R Aslankoc
- Department of Physiology, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey
| | - O Ozmen
- Department of Pathology, Faculty of Veterinary Medicine, Mehmet Akif Ersoy University, Burdur, Turkey
| | - Y Erzurumlu
- Department of Biochemistry, Faculty of Pharmacy, Suleyman Demirel University, Isparta, Turkey
| | - H B Savas
- Department of Medical Biochemistry, Faculty of Medicine, Alanya Alaaddin Keykubat University, Antalya, Turkey
| | - E N Temel
- Department of Infectious Diseases, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey
| | - P A Kosar
- Department of Medical Biology, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey
| | - S Boztepe
- Department of Anesthesia and Reanimation, Antalya Training and Research Hospital, University of Health Sciences, Antalya, Turkey
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Kuwajima K, Chang K, Furuta A, Bougaki M, Uchida K, Sawamura S, Yamada Y. Synergistic cytoprotection by co-treatment with dexamethasone and rapamycin against proinflammatory cytokine-induced alveolar epithelial cell injury. J Intensive Care 2019; 7:12. [PMID: 30774959 PMCID: PMC6367811 DOI: 10.1186/s40560-019-0365-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 01/22/2019] [Indexed: 11/10/2022] Open
Abstract
Background One of the main pathophysiological manifestations during the acute phase of sepsis is massive production of proinflammatory mediators. Clinical trials involving direct suppression of inflammatory mediators to relieve organ dysfunction in sepsis have been extensively performed; however, the clinical outcomes of such trials remain far from satisfactory. Given the need for better sepsis treatments, we have screened various agents with anti-inflammatory properties for cytoprotective effects. In this study, we identified dexamethasone and rapamycin as clinically applicable candidates with favorable synergistic effects against inflammatory cytokine-induced cytotoxicity in vitro and further explored the molecular mechanisms underlying the augmented cytoprotective effects exerted by co-treatment with both drugs. Methods Human alveolar epithelial cell-derived A549 cells were stimulated with a mixture of inflammatory cytokines, TNF-alpha, IL-1beta, and IFN-gamma, which induce cellular injury, including apoptosis. This in vitro model was designed to simulate acute lung injury (ALI) associated with sepsis. The cells were co-treated with dexamethasone and rapamycin under cytokine stimulation. Conditioned medium and cell lysates were subjected to further analysis. Results Either dexamethasone or rapamycin significantly attenuated cytokine-induced cytotoxicity in A549 cells in a dose-dependent manner. In addition, the simultaneous administration of dexamethasone and rapamycin had a synergistic cytoprotective effect. The applied doses of dexamethasone (10 nM) and rapamycin (1 nM) were considerably below the reported plasma concentrations of each drug in clinical setting. Interestingly, distinct augmentation of both of c-Jun inhibition and Akt activation were observed when the cells were co-treated with both drugs under cytokine stimulation. Conclusions A synergistic protective effect of dexamethasone and rapamycin was observed against cytokine-induced cytotoxicity in A549 cells. Augmentation of both of c-Jun inhibition and Akt activation were likely responsible for the cytoprotective effect. The combined administration of anti-inflammatory drugs such as dexamethasone and rapamycin offers a promising treatment option for alveolar epithelial injury associated with sepsis.
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Affiliation(s)
- Ken Kuwajima
- 1Department of Anesthesiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Kyungho Chang
- 2Anesthesiology and Intensive Care Unit, Teikyo University School of Medicine, Tokyo, Japan
| | - Ai Furuta
- 1Department of Anesthesiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Masahiko Bougaki
- 1Department of Anesthesiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Kanji Uchida
- 1Department of Anesthesiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Shigehito Sawamura
- 2Anesthesiology and Intensive Care Unit, Teikyo University School of Medicine, Tokyo, Japan
| | - Yoshitsugu Yamada
- 1Department of Anesthesiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
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Lendak DF, Mihajlović DM, Novakov-Mikić AS, Boban JM, Ubavić M, Brkić SV. APRIL and sTACI could be predictors of multiorgan dysfunction syndrome in sepsis. Virulence 2018; 9:946-953. [PMID: 29781374 PMCID: PMC7000195 DOI: 10.1080/21505594.2018.1462636] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 03/30/2018] [Accepted: 04/05/2018] [Indexed: 12/29/2022] Open
Abstract
Although the role of B cells in sepsis immunoregulation has become an interesting topic, there is lack of data on the role of B cell function regulators in prediction of multiorgan dysfunction syndrome (MODS). The aim of this study was to evaluate the prognostic value of A Proliferation Inducing Ligand (APRIL) and soluble Transmembrane Activator and CAML Interactor Protein (sTACI), the main B cell function regulators, in prediction of MODS development within the first 48 h after admission to intensive care unit, among septic patients. We included 112 patients with sepsis, treated at Clinic for Infectious Diseases and Emergency Center, Clinical Center of Vojvodina, Novi Sad, Serbia. Plasma concentrations of APRIL and sTACI were determined at the admission and potential development of MODS was confirmed in the first 48 h. Concentrations of APRIL (p = 0.003) and sTACI (p<0.001) were higher in patients who developed MODS (n = 30). ROC curve analysis showed that AUC for sTACI (AUC = 0.764) was greater than that for procalcitonin (AUC = 0.719) and APRIL (AUC = 0.673) in MODS development prediction. Multivariate regression analysis showed that sTACI, as an anti-inflammatory biomarker stimulating the apoptosis of B cells, was the only independent predictor of MODS, beside SOFA score. Elevated level of sTACI could be the alarm for the increased B cell apoptosis and development of immune paralysis. Including these biomarkers into predictive scores specific for septic patients may potentially improve their sensitivity and specificity. Measurement of their concentrations dynamics could contribute to better assessment of sepsis evolution and timely introduction of immunomodulatory therapy.
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Affiliation(s)
- Dajana F. Lendak
- Department of Infectious Diseases, Faculty of Medicine, University of Novi Sad; Clinic for Infectious Diseases, Clinical centre of Vojvodina; Hajduk Veljkova 3, Novi Sad, Serbia
| | - Dunja M. Mihajlović
- Department of Anesthesiology and Perioperative Medicine, Faculty of Medicine, University of Novi Sad; Emergency Center, Clinical centre of Vojvodina, Hajduk Veljkova 3, Novi Sad, Serbia
| | - Aleksandra S. Novakov-Mikić
- Department of Gynaecology and Obstetrics, Faculty of Medicine, University of Novi Sad; Clinical Center of Vojvodina, Clinic of Gynecology and Obstetrics, Hajduk Veljkova 1, Novi Sad, Serbia
| | - Jasmina M. Boban
- Department of Radiology, Faculty of Medicine, University of Novi Sad, Hajduk Veljkova 1, Novi Sad, Serbia
| | - Milan Ubavić
- Health Care Institution for Laboratory Diagnostics „Medlab“, Ilije Ognjanovića 1, Novi Sad, Serbia
| | - Snežana V. Brkić
- Department of Infectious Diseases, Faculty of Medicine, University of Novi Sad; Clinic for Infectious Diseases, Clinical centre of Vojvodina; Hajduk Veljkova 3, Novi Sad, Serbia
- Department of Infectious Diseases, Faculty of Medicine, University of Novi Sad, Clinic for Infectious Diseases, Clinical centre of Vojvodina, Hajduk Veljkova 1, Novi Sad, Serbia
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Yurinskaya MM, Kochetkova OY, Shabarchina LI, Antonova OY, Suslikov AV, Evgen'ev MB, Vinokurov MG. Encapsulated Hsp70 decreases endotoxin-induced production of ROS and TNFα in human phagocytes. Cell Stress Chaperones 2017; 22:163-171. [PMID: 27783274 PMCID: PMC5225061 DOI: 10.1007/s12192-016-0743-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 10/10/2016] [Accepted: 10/11/2016] [Indexed: 12/15/2022] Open
Abstract
Human heat shock protein Hsp70 was experimentally inserted into polyelectrolyte microcapsules. Encapsulated recombinant Hsp70 was studied in terms of its effects on neutrophil apoptosis, the production of reactive oxygen species, and the secretion of tumor necrosis factor alpha by promonocytic THP-1 cells. It was found that encapsulated Hsp70 effectively inhibits neutrophil apoptosis, unlike free exogenous protein used in solution. In THP-1 cells, encapsulated and free Hsp70 reduced LPS-induced tumor necrosis factor alpha production with a similar efficiency. Encapsulated Hsp70 reduces LPS-induced reactive oxygen species production by neutrophils in the course of its release from the microcapsules but not as much as free Hsp70. Thus, the polyelectrolyte microcapsules can be used as containers for the effective delivery of Hsp70 to neutrophils and monocytes to significantly improve the functioning of the innate immune system.
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Affiliation(s)
- M M Yurinskaya
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov Str. 32, Moscow, Russian Federation, 119991
- Institute of Cell Biophysics, Russian Academy of Science, Institutskaya Str. 3, Pushchino, Moscow Region, Russian Federation, 142290
| | - O Yu Kochetkova
- Institute of Cell Biophysics, Russian Academy of Science, Institutskaya Str. 3, Pushchino, Moscow Region, Russian Federation, 142290
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Institutskaya Str. 3, Pushchino, Moscow Region, Russian Federation, 142290
| | - L I Shabarchina
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Institutskaya Str. 3, Pushchino, Moscow Region, Russian Federation, 142290
| | - O Yu Antonova
- Institute of Cell Biophysics, Russian Academy of Science, Institutskaya Str. 3, Pushchino, Moscow Region, Russian Federation, 142290
| | - A V Suslikov
- Hospital of the Pushchino Research Center, Institutskaya Str. 1, Pushchino, Moscow Region, Russian Federation, 142290
| | - M B Evgen'ev
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov Str. 32, Moscow, Russian Federation, 119991.
- Institute of Cell Biophysics, Russian Academy of Science, Institutskaya Str. 3, Pushchino, Moscow Region, Russian Federation, 142290.
| | - M G Vinokurov
- Institute of Cell Biophysics, Russian Academy of Science, Institutskaya Str. 3, Pushchino, Moscow Region, Russian Federation, 142290
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Major apoptotic mechanisms and genes involved in apoptosis. Tumour Biol 2016; 37:8471-86. [PMID: 27059734 DOI: 10.1007/s13277-016-5035-9] [Citation(s) in RCA: 362] [Impact Index Per Article: 45.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 03/28/2016] [Indexed: 12/12/2022] Open
Abstract
As much as the cellular viability is important for the living organisms, the elimination of unnecessary or damaged cells has the opposite necessity for the maintenance of homeostasis in tissues, organs and the whole organism. Apoptosis, a type of cell death mechanism, is controlled by the interactions between several molecules and responsible for the elimination of unwanted cells from the body. Apoptosis can be triggered by intrinsically or extrinsically through death signals from the outside of the cell. Any abnormality in apoptosis process can cause various types of diseases from cancer to auto-immune diseases. Different gene families such as caspases, inhibitor of apoptosis proteins, B cell lymphoma (Bcl)-2 family of genes, tumor necrosis factor (TNF) receptor gene superfamily, or p53 gene are involved and/or collaborate in the process of apoptosis. In this review, we discuss the basic features of apoptosis and have focused on the gene families playing critical roles, activation/inactivation mechanisms, upstream/downstream effectors, and signaling pathways in apoptosis on the basis of cancer studies. In addition, novel apoptotic players such as miRNAs and sphingolipid family members in various kind of cancer are discussed.
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11
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Credille BC, Woolums AR, Overton MW, Hurley DJ, Giguère S. Expression of inflammation-associated genes in circulating leukocytes and activity of indoleamine-2,3-dioxygenase in dairy cattle with acute puerperal metritis and bacteremia. Res Vet Sci 2015; 101:6-10. [PMID: 26267081 DOI: 10.1016/j.rvsc.2015.05.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 05/16/2015] [Accepted: 05/19/2015] [Indexed: 12/13/2022]
Abstract
OBJECTIVE To investigate whether expression of genes associated with inflammation and activity of indoleamine-2,3-dioxygenase (IDO) correlated with disease status and prevalence of bacteremia in post-partum dairy cattle with and without acute puerperal metritis (APM). PROCEDURES Blood was collected from cattle with APM and control cattle matched by parity and days in milk. Leukocytes were isolated and expression of 6 genes was quantified. Activity of IDO was measured in serum with higher performance liquid chromatography (HPLC). RESULTS The relative expression of IL-1β in cattle with APM was significantly lower than that in controls. IDO activity was not significantly different between bacteremic and non-bacteremic cattle CONCLUSIONS AND CLINICAL RELEVANCE The expression of IL-1β was lower in cattle with APM. The lower levels of IL-1β expression in PBMCs of cattle with APM suggest impaired inflammatory responses and may contribute to the development of the disease in this population of animals.
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Affiliation(s)
- Brent C Credille
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, United States.
| | - Amelia R Woolums
- Department of Large Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, United States
| | - Michael W Overton
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, United States
| | - David J Hurley
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, United States
| | - Steeve Giguère
- Department of Large Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, United States
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12
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Hsing CH, Wang JJ. Clinical implication of perioperative inflammatory cytokine alteration. ACTA ACUST UNITED AC 2015; 53:23-8. [PMID: 25837846 DOI: 10.1016/j.aat.2015.03.002] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 03/06/2015] [Indexed: 12/22/2022]
Abstract
Cytokines are key modulators of inflammatory responses, and play an important role in the defense and repair mechanisms following trauma. After traumatic injury, an immuno-inflammatory response is initiated immediately, and cytokines rapidly appear and function as a regulator of immunity. In pathologic conditions, imbalanced cytokines may provide systemic inflammatory responses or immunosuppression. Expression of perioperative cytokines vary by different intensities of surgical trauma and types of anesthesia and anesthetic agents. Inflammatory cytokines play important roles in postoperative organ dysfunction including central nervous system, cardiovascular, lung, liver, and kidney injury. Inhibition of cytokines could protect against traumatic injury in some circumstances, therefore cytokine inhibitors or antagonists might have the potential for reducing postoperative tissue/organ dysfunction. Cytokines are also involved in wound healing and post-traumatic pain. Application of cytokines for the improvement of surgical wound healing has been reported. Anesthesia-related immune response adjustment might reduce perioperative morbidity because it reduces proinflammatory cytokine expression; however, the overall effects of anesthetics on postoperative immune-inflammatory responses needs to be further investigated.
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Affiliation(s)
- Chung-Hsi Hsing
- Department of Medical Research, Chi-Mei Medical Center, Tainan, Taiwan; Department of Anesthesiology, Chi-Mei Medical Center, Tainan, Taiwan; Department of Anesthesiology, Taipei Medical University, Taipei, Taiwan.
| | - Jhi-Joung Wang
- Department of Medical Research, Chi-Mei Medical Center, Tainan, Taiwan; Department of Anesthesiology, Chi-Mei Medical Center, Tainan, Taiwan
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13
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Dioscin-induced apoptosis of human LNCaP prostate carcinoma cells through activation of caspase-3 and modulation of Bcl-2 protein family. ACTA ACUST UNITED AC 2014; 34:125-130. [PMID: 24496691 DOI: 10.1007/s11596-014-1243-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 11/29/2013] [Indexed: 12/12/2022]
Abstract
Dioscin is a natural steroid saponin derived from several plants, showing potent anti-cancer effect against a variety of tumor cell lines. In the present study, we investigated the anti-cancer activity of dioscin against human LNCaP cells, and evaluated the possible mechanism involved in its antineoplastic action. It was found that dioscin (1, 2 and 4 μmol/L) could significantly inhibit the viability of LNCaP cells in a time- and concentration-dependent manner. Flow cytometry revealed that the apoptosis rate was increased after treatment of LNCaP cells with dioscin for 24 h, indicating that apoptosis was an important mechanism by which dioscin inhibited cancer. Western blotting was employed to detect the expression of caspase-3, Bcl-2 and Bax in LNCaP cells. The expression of cleaved caspase-3 was significantly increased, and meanwhile procaspase-3 was markedly decreased. The expression of anti-apoptotic protein Bcl-2 was down-regulated, whereas the pro-apoptotic protein Bax was up-regulated. Moreover, the Bcl-2/Bax ratio was drastically decreased. These results suggested that dioscin possessed potential anti-tumor activity in human LNCaP cells through the apoptosis pathway, which might be associated with caspase-3 and Bcl-2 protein family.
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Harjai M, Bogra J, Kohli M, Pant AB. Is suppression of apoptosis a new therapeutic target in sepsis? Anaesth Intensive Care 2013; 41:175-83. [PMID: 23530784 DOI: 10.1177/0310057x1304100207] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Sepsis remains as a leading cause of death in critically ill patients. Unfortunately, there have been very few successful specific therapeutic agents that can significantly reduce the attributable mortality and morbidity of sepsis. Developing novel therapeutic strategies to improve outcomes of sepsis remains an important focus of ongoing research in the field of critical care medicine. Apoptosis has recently been identified as an important mechanism of cell death and evidence suggests that prevention of cell apoptosis can improve survival in animal models of sepsis and endotoxaemia. In this review article, we summarise the critical role of apoptosis of the immune cells in the pathophysiology of sepsis and propose that blocking cell-signaling pathways leading to apoptosis may present a promising specific therapy for sepsis. Various methods to inhibit apoptosis including the cell surface Fas receptor pathway inhibitors, caspase inhibitors, over-expression of anti-apoptotic genes and small interfering ribonucleic acid therapy are discussed.
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Affiliation(s)
- M Harjai
- Department of Anesthesilogy, Chhatrapati Shahuji Maharaj Medical University, Lucknow, Uttar Pradesh, India.
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15
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Effect of heat stress on cellular and humoral immunity and its cure with α-tocopherol in meat type birds. Livest Sci 2012. [DOI: 10.1016/j.livsci.2012.06.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Danger signals activating the immune response after trauma. Mediators Inflamm 2012; 2012:315941. [PMID: 22778496 PMCID: PMC3388465 DOI: 10.1155/2012/315941] [Citation(s) in RCA: 156] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2012] [Revised: 03/23/2012] [Accepted: 03/26/2012] [Indexed: 12/29/2022] Open
Abstract
Sterile injury can cause a systemic inflammatory response syndrome (SIRS) that resembles the host response during sepsis. The inflammatory response following trauma comprises various systems of the human body which are cross-linked with each other within a highly complex network of inflammation. Endogenous danger signals (danger-associated molecular patterns; DAMPs; alarmins) as well as exogenous pathogen-associated molecular patterns (PAMPs) play a crucial role in the initiation of the immune response. With popularization of the “danger theory,” numerous DAMPs and PAMPs and their corresponding pathogen-recognition receptors have been identified. In this paper, we highlight the role of the DAMPs high-mobility group box protein 1 (HMGB1), interleukin-1α (IL-1α), and interleukin-33 (IL-33) as unique dual-function mediators as well as mitochondrial danger signals released upon cellular trauma and necrosis.
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Paunel-Görgülü A, Kirichevska T, Lögters T, Windolf J, Flohé S. Molecular mechanisms underlying delayed apoptosis in neutrophils from multiple trauma patients with and without sepsis. Mol Med 2012; 18:325-35. [PMID: 22231730 DOI: 10.2119/molmed.2011.00380] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 12/02/2011] [Indexed: 01/01/2023] Open
Abstract
Delayed neutrophil apoptosis and overshooting neutrophil activity contribute to organ dysfunction and subsequent organ failure in sepsis. Here, we investigated apoptotic signaling pathways that are involved in the inhibition of spontaneous apoptosis in neutrophils isolated from major trauma patients with uneventful outcome as well as in those with sepsis development. DNA fragmentation in peripheral blood neutrophils showed an inverse correlation with the organ dysfunction at d 10 after trauma in all patients, supporting the important role of neutrophil apoptosis regulation for patient's outcome. The expression of the antiapoptotic Bcl-2 protein members A1 and Mcl-1 were found to be diminished in the septic patients at d 5 and d 10 after trauma. This decrease was also linked to an impaired intrinsic apoptosis resistance, which has been previously shown to occur in neutrophils during systemic inflammation. In patients with sepsis development, delayed neutrophil apoptosis was found to be associated with a disturbed extrinsic pathway, as demonstrated by reduced caspase-8 activity and Bid truncation. Notably, the expression of Dad1 protein, which is involved in protein N-glycosylation, was significantly increased in septic patients at d 10 after trauma. Taken together, our data demonstrate that neutrophil apoptosis is regulated by both the intrinsic and extrinsic pathway, depending on patient's outcome. These findings might provide a molecular basis for new strategies targeting cell death pathways in apoptosis-resistant neutrophils during systemic inflammation.
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Affiliation(s)
- Adnana Paunel-Görgülü
- Department of Trauma and Hand Surgery, University Hospital Düsseldorf, Düsseldorf, Germany
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Lewis D, Chan D, Pinheiro D, Armitage‐Chan E, Garden O. The immunopathology of sepsis: pathogen recognition, systemic inflammation, the compensatory anti-inflammatory response, and regulatory T cells. J Vet Intern Med 2012; 26:457-82. [PMID: 22428780 PMCID: PMC7166777 DOI: 10.1111/j.1939-1676.2012.00905.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Revised: 11/28/2011] [Accepted: 02/07/2012] [Indexed: 02/06/2023] Open
Abstract
Sepsis, the systemic inflammatory response to infection, represents the major cause of death in critically ill veterinary patients. Whereas important advances in our understanding of the pathophysiology of this syndrome have been made, much remains to be elucidated. There is general agreement on the key interaction between pathogen-associated molecular patterns and cells of the innate immune system, and the amplification of the host response generated by pro-inflammatory cytokines. More recently, the concept of immunoparalysis in sepsis has also been advanced, together with an increasing recognition of the interplay between regulatory T cells and the innate immune response. However, the heterogeneous nature of this syndrome and the difficulty of modeling it in vitro or in vivo has both frustrated the advancement of new therapies and emphasized the continuing importance of patient-based clinical research in this area of human and veterinary medicine.
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Affiliation(s)
- D.H. Lewis
- Department of Veterinary Clinical SciencesThe Royal Veterinary CollegeHatfield CampusHertfordshire,UK (Lewis, Chan, Garden)
- Present address:
Langford Veterinary ServicesSmall Animal HospitalLangford HouseLangfordBristol, BS40 5DUUK
| | - D.L. Chan
- Department of Veterinary Clinical SciencesThe Royal Veterinary CollegeHatfield CampusHertfordshire,UK (Lewis, Chan, Garden)
| | - D. Pinheiro
- Regulatory T Cell LaboratoryThe Royal Veterinary CollegeCamden Campus, LondonNW1 OTUUK (Pinheiro, Garden)
| | - E. Armitage‐Chan
- Davies Veterinary SpecialistsManor Farm Business ParkHertfordshireSG5 3HR, UK (Armitage‐Chan)
| | - O.A. Garden
- Department of Veterinary Clinical SciencesThe Royal Veterinary CollegeHatfield CampusHertfordshire,UK (Lewis, Chan, Garden)
- Regulatory T Cell LaboratoryThe Royal Veterinary CollegeCamden Campus, LondonNW1 OTUUK (Pinheiro, Garden)
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Vinokurov M, Ostrov V, Yurinskaya M, Garbuz D, Murashev A, Antonova O, Evgen’ev M. Recombinant human Hsp70 protects against lipoteichoic acid-induced inflammation manifestations at the cellular and organismal levels. Cell Stress Chaperones 2012; 17:89-101. [PMID: 21845530 PMCID: PMC3227847 DOI: 10.1007/s12192-011-0288-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Revised: 07/30/2011] [Accepted: 08/01/2011] [Indexed: 01/13/2023] Open
Abstract
It has been previously reported that pretreatment with exogenous heat shock protein 70 (Hsp70) is able to protect cells and animals from the deleterious effects of bacterial lipopolysaccharide (LPS) produced by Gram-negative bacteria. However, the effects of Hsp70 pretreatment on lipoteichoic acid (LTA) challenge resulted from Gram-positive bacteria infection have not been fully elucidated. In this study, we demonstrated that preconditioning with human recombinant Hsp70 ameliorates various manifestations of systematic inflammation, including reactive oxygen species, TNFα, and CD11b/CD18 adhesion receptor expression induction observed in different myeloid cells after LTA addition. Therefore, exogenous Hsp70 may provide a mechanism for controlling excessive inflammatory responses after macrophage activation. Furthermore, in a rat model of LTA-induced sepsis, we demonstrated that prophylactic administration of exogenous human Hsp70 significantly exacerbated numerous homeostatic and hemodynamic disturbances induced by LTA challenge and partially normalized the coagulation system and multiple biochemical blood parameters, including albumin and bilirubin concentrations, which were severely disturbed after LTA injections. Importantly, prophylactic intravenous injection of Hsp70 before LTA challenge significantly reduced mortality rates. Thus, exogenous mammalian Hsp70 may serve as a powerful cellular defense agent against the deleterious effects of bacterial pathogens, such as LTA and LPS. Taken together, our findings reveal novel functions of this protein and establish exogenous Hsp70 as a promising pharmacological agent for the prophylactic treatment of various types of sepsis.
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Affiliation(s)
- Maxim Vinokurov
- Institute of Cell Biophysics of RAS, Pushchino, Moscow Region, 142290 Russia
- Pushchino State University, Pushchino, Moscow Region, 142290 Russia
| | - Vladimir Ostrov
- Branch of Shemyakin & Ovchinnikov Institute of Bioorganic Chemistry of RAS, Pushchino, Moscow Region, 142290 Russia
| | - Marina Yurinskaya
- Institute of Cell Biophysics of RAS, Pushchino, Moscow Region, 142290 Russia
| | - David Garbuz
- Engelhardt Institute of Molecular Biology of RAS, Vavilova, 32, Moscow, 119991 Russia
| | - Arkady Murashev
- Branch of Shemyakin & Ovchinnikov Institute of Bioorganic Chemistry of RAS, Pushchino, Moscow Region, 142290 Russia
| | - Olga Antonova
- Institute of Cell Biophysics of RAS, Pushchino, Moscow Region, 142290 Russia
- Pushchino State University, Pushchino, Moscow Region, 142290 Russia
| | - Mikhail Evgen’ev
- Engelhardt Institute of Molecular Biology of RAS, Vavilova, 32, Moscow, 119991 Russia
- Institute of Cell Biophysics of RAS, Pushchino, Moscow Region, 142290 Russia
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Circulating levels of peroxiredoxin 4 as a novel biomarker of oxidative stress in patients with sepsis. Shock 2011; 35:460-5. [PMID: 21283059 DOI: 10.1097/shk.0b013e3182115f40] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Oxidative stress, a situation with increased reactive oxygen species production and/or decreased antioxidant defense mechanisms, is evident in the pathogenesis of sepsis. Peroxiredoxin 4 (Prx4) is a hydrogen peroxide degrading peroxidase recently found circulating in blood of septic patients and potentially reflecting an antioxidant system in imbalance. We studied Prx4 serum levels of 79 consecutively enrolled medical intensive care unit patients. The diagnostic and prognostic performance of Prx4 was compared with other biomarkers, the APACHE II score and the SOFA score. Median Prx4 serum levels gradually increased with disease severity in patients classified on admission as having systemic immune response syndrome (2.32 arbitrary [arb.] U/L), sepsis (5.02 arb. U/L), severe sepsis (11.7 arb. U/L), or septic shock (11.4 arb. U/L). A positive correlation was found with the severity score Acute Physiological and Chronic Health Evaluation II (r = 0.27, P < 0.05) and the organ failure score Sequential Organ Failure Assessment (r = 0.55, P < 0.0001). Peroxiredoxin 4 correlated with the sepsis marker procalcitonin (r = 0.61, P < 0.0001), the inflammatory markers C-reactive protein (r = 0.65, P < 0.0001) and interleukin 6 (r = 0.62, P < 0.0001), and antioxidant blood compounds total bilirubin (r = 0.37, P < 0.001) and albumin (r = -0.54, P < 0.0001). Peroxiredoxin 4 distinguished noninfectious from infectious inflammatory response syndrome with an area under the receiver operating characteristic (ROC) curve of 0.82. [corrected] High Prx4 serum levels were associated with a poor prognosis of septic patients and revealed an area under the ROC curve of 0.76 in prediction of in-hospital mortality. In this study, elevated serum levels of the antioxidant Prx4 were associated with an increased disease severity and adverse outcome of critically ill patients with sepsis. Peroxiredoxin 4 may therefore be a helpful new biomarker for diagnosing, monitoring, and risk assessing these patients. The pathophysiological mechanisms behind the observed increase remain to be elucidated.
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Eipel C, Hildebrandt A, Scholz B, Schyschka L, Minor T, Kreikemeyer B, Ibrahim SM, Vollmar B. Mutation of mitochondrial ATP8 gene improves hepatic energy status in a murine model of acute endotoxemic liver failure. Life Sci 2010; 88:343-9. [PMID: 21167184 DOI: 10.1016/j.lfs.2010.12.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Revised: 11/26/2010] [Accepted: 12/06/2010] [Indexed: 10/18/2022]
Abstract
AIMS Mitochondria not only generate and modulate bioenergy but also serve as biosensors for oxidative stress, and eventually become effector organelles for cell viability. Therefore, the implications of mitochondrial (dys)function in the development of multiple organ failure are profound. We investigated whether a mutation in the ATPase subunit-8 gene affects the course of endotoxemic acute liver failure. MAIN METHODS C57BL/6J (ATP8 wild type) and C57BL/6J-mt(FVB/N) (ATP8 mutant) mice were challenged with d-galactosamine (GalN) and Escherichia coli lipopolysaccharide (LPS) for induction of acute liver failure, and studied 6 h thereafter. Control mice received physiological saline only. Analysis included in vivo fluorescence microscopy of hepatic microcirculation and levels of hepatocellular apoptosis, hepatic adenosine nucleotides and oxidative stress. Additionally, survival rates were assessed. KEY FINDINGS Induction of endotoxemic liver failure provoked marked liver damage, which was coexistent with a drop of total adenosine nucleotide levels and increased oxidative stress. Of interest, oxidative stress was higher in the GalN/LPS challenged ATP8 mutants compared to wild types. Concomitantly, adenosine triphosphate (ATP) levels in livers of mice carrying the ATP8 mutation remained higher than those in wild type mice. As net result, ATP8 mutants showed lower transaminase release and a tendency to better survival rate upon GalN/LPS exposure compared to wild types. SIGNIFICANCE Our findings demonstrate that mutation in the ATPase subunit-8 partially protects mice against endotoxemic stress, most probably due to better hepatic energy status despite elevated oxidative stress. Thus, modulating mitochondrial function to preserve bioenergetic status may be an effective strategy to protect against sepsis-induced multiorgan dysfunction.
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Affiliation(s)
- Christian Eipel
- Institute for Experimental Surgery, University of Rostock, Schillingallee 69 a, 18055 Rostock, Germany.
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Vaki I, Kranidioti H, Karagianni V, Spyridaki A, Kotsaki A, Routsi C, Giamarellos-Bourboulis EJ. An early circulating factor in severe sepsis modulates apoptosis of monocytes and lymphocytes. J Leukoc Biol 2010; 89:343-9. [DOI: 10.1189/jlb.0410232] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Rozhkova E, Yurinskaya M, Zatsepina O, Garbuz D, Karpov V, Surkov S, Murashev A, Ostrov V, Margulis B, Evgen'ev M, Vinokurov M. Exogenous mammalian extracellular HSP70 reduces endotoxin manifestations at the cellular and organism levels. Ann N Y Acad Sci 2010; 1197:94-107. [PMID: 20536838 DOI: 10.1111/j.1749-6632.2009.05375.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In this study, we checked whether HSP70 preparations of different origins are able to protect model animals (rats) from endotoxic shock and modify the response of myeloid cells to lipopolysaccharide (LPS) challenge. It was shown that HSP70 preparations can effectively protect organisms from endotoxic shock by strongly decreasing mortality and restoring both homeostasis and various hemodynamic characteristics. At the cellular level, HSP70 preparations significantly inhibit LPS-induced reactive oxygen species production in various myeloid cells and decrease NO expression in macrophages, which is enhanced after LPS priming. In parallel, HSP70 preconditioning partially normalizes neutrophil apoptosis, which is disturbed as a result of LPS stimulation. These results suggest that the antiseptic actions of HSP70 preparations are probably realized at the level of receptor membrane complexes of myeloid cells, which represent the major target of LPS action. Taken together, our findings show that extracellular mammalian HSP70 may play an important role in innate immunity modulation and stimulation of endogenous protective mechanisms, both at the cellular and organism levels, which make this protein a promising base for the development of efficient antiseptic drugs.
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Affiliation(s)
- Elena Rozhkova
- Engelhardt Institute of Molecular Biology of the Russian Academy of Science, Vavilova, Moscow, Russia
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Iida A, Yoshidome H, Shida T, Takano S, Takeuchi D, Kimura F, Shimizu H, Ohtsuka M, Miyazaki M. Hepatocyte nuclear factor-kappa beta (NF-kappaB) activation is protective but is decreased in the cholestatic liver with endotoxemia. Surgery 2010; 148:477-89. [PMID: 20227101 DOI: 10.1016/j.surg.2010.01.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2009] [Accepted: 01/18/2010] [Indexed: 12/30/2022]
Abstract
BACKGROUND Obstructive jaundice (OJ) is an important clinical consideration associated with a high risk of bacteremia. Hepatocyte nuclear factor-kappa B (NF-kappaB) activation confers an antiapoptotic function. Although the occurrence of hepatocyte apoptosis has been shown in OJ, the activation and role of NF-kappaB over the time course of OJ in conjunction with endotoxemia have not yet been well defined. We hypothesized that NF-kappaB activation may be decreased over the time course of OJ and endotoxemia, which leads to severe liver injury. The aim of the current study was to examine whether NF-kappaB activation can decrease hepatocyte apoptosis and liver injury over the time course of OJ in response to lipopolysaccharide (LPS) administration. METHODS Male C57BL/6 mice were subjected to bile duct ligation and were administered LPS intravenously at 3 days (OJ3) or 14 days (OJ14) after bile duct ligation. NF-kappaB activation; protein expressions of NF-kappaB p65, IkappaB-alpha, Ikappabeta-b, and Pin1; immunohistochemistry of poly adenosine diphosphate (ADP)-ribose polymerase p85 fragment (PARP); and serum alanine transaminase (ALT) levels were examined. RESULTS Hepatocyte NF-kappaB activation was observed during OJ. After LPS administration, the hepatic NF-kappaB activation defined by electrophoretic mobility shift assay was decreased in the OJ14 group compared with the OJ3 group, which is consistent with a decrease in NF-kappaB p65 protein expression. Changes in phosphorylated Ikappa-B-beta but not phosphorylated IkappaB-alpha mirrored these results. Significant hepatocyte apoptosis defined by PARP immunohistochemistry was observed in the LPS-treated OJ14 relative to the LPS-treated OJ3. Hepatic expressions of tumor necrosis factor-alpha (TNF-alpha) and interleukin-6 (IL-6) in the LPS OJ14 mice were upregulated relative to those in the LPS OJ3. Serum ALT levels increased significantly in the LPS OJ14 relative to other mice. The survival rate was significantly less in the LPS OJ14 relative to other mice. CONCLUSION After prolonged OJ, exposure to endotoxemia was associated with a decrease in hepatocyte NF-kappaB activation and an increase in hepatocyte apoptosis and secondary necrosis, thus resulting in liver dysfunction.
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Affiliation(s)
- Ayako Iida
- Department of General Surgery, Chiba University Graduate School of Medicine, Chiba, Japan
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Second-generation sulfonylureas preserve inhibition of mitochondrial permeability transition by the mitochondrial K+(ATP) opener nicorandil in experimental myocardial infarction. Shock 2009; 32:247-52. [PMID: 19174741 DOI: 10.1097/shk.0b013e31819c3794] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Openers of K+(ATP) channels protect the myocardium from I/R injury. Sulfonylureas are known as potent blockers of K(ATP) channels. We investigated whether 1) mitochondrial permeability transition pore may be involved in the protection afforded by the mitoK+(ATP) opener nicorandil and 2) whether sulfonylureas may prevent this beneficial effect. Anesthetized New Zealand White rabbits underwent 30 min of coronary artery occlusion, followed by 60 (isolated mitochondria) or 240 min (infarct size) of reperfusion. They received an administration of either saline (control) or nicorandil (0.5 mg kg(-1), i.v.) 15 min before ischemia. Each control and nicorandil group was divided in four subgroups pretreated by either saline, glibenclamide (Glib; 1 mg kg(-1)), gliclazide (Glic; 1 mg kg(-1)), or glimepiride (Glim; 5 microg kg(-1)) 10 min before this. Infarct size was assessed by triphenyltetrazolium chloride staining. Mitochondria were isolated from the area at risk for further assessment of the calcium retention capacity. Glibenclamide (35 +/- 8), but neither Glic (61 +/- 9) nor Glim (48 +/- 7), reversed the improvement in calcium retention capacity due to nicorandil (58 +/- 10 vs. 27 +/- 8 nmoles CaCl2 mg(-1) proteins in control). Infarct size reduction by nicorandil (32% +/- 6% vs. 65% +/- 6% of area at risk) was abolished by Glib (55 +/- 5) but not by Glic (37 +/- 3) or Glim (31 +/- 5). These data suggest that 1) the protective effect of nicorandil involves the inhibition of the mitochondrial permeability transition pore and 2) that unlike Glib, second-generation sulfonylureas preserve this cardioprotection.
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Abstract
Biliary obstructive jaundice (OJ) is an important clinical consideration concerning high bacteremic risk. Hepatocyte apoptosis is one of the causes of cholestatic liver injury. The aim of the current study was to examine the precise pathway and time course of hepatocyte apoptosis during OJ with LPS administration and to determine if OJ sensitizes the liver to endotoxemia. Male C57BL/6 mice were subjected to bile duct ligation and division and were administered with LPS at 3 (OJ3) or 14 (OJ14) days after surgery. Fas ligand expression, poly (adenosine diphosphate-ribose) polymerase p85 fragment immunohistochemistry, activation of caspases 3, 8, and 9, serum alanine aminotransferase levels, and hepatic adenosine triphosphate (ATP) contents were examined. Survival after LPS administration in male C57BL/6 or gld/gld (Fas ligand-deficient) mice was determined. The expression of Fas ligand increased during OJ. After LPS administration, the expression of cleaved caspases 3 and 8 increased in Sham3, Sham14, OJ3, and OJ14 mice, and it significantly increased in OJ14 compared with other mice. Poly (adenosine diphosphate-ribose) polymerase p85 immunohistochemistry showed significant hepatocyte apoptosis after LPS administration in OJ14 mice relative to OJ3. In OJ14 with LPS administration, ATP contents significantly decreased and alanine aminotransferase levels increased. Hepatocyte apoptosis was decreased in gld/gld OJ14 mice compared with C57BL/6 OJ14. All C57BL/6 OJ14 mice with LPS died, but survival in gld/gld OJ14 significantly ameliorated. In prolonged OJ with LPS administration, hepatocyte apoptosis depending on Fas ligand expression significantly increased in association with a decrease in ATP contents, thus resulting in liver necrapoptosis.
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Persistent inhibition of mitochondrial permeability transition by preconditioning during the first hours of reperfusion. Shock 2009; 30:552-6. [PMID: 18317409 DOI: 10.1097/shk.0b013e31816a1c1c] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Mitochondrial permeability transition pore (mPTP) opening is a crucial event in cardiomyocyte death after I/R. We questioned whether preconditioning (PC) may inhibit mPTP opening during ischemia and/or during reperfusion and whether this effect would persist as reperfusion evolves. Anesthetized New Zealand white rabbits underwent a test ischemia followed by reperfusion. Ischemia lasted either 10 or 30 min, whereas reperfusion duration varied from 5 to 20, 60 and up to 240 min. For each duration of ischemia and reperfusion, animals were randomized as either control or PC. Preconditioning was induced by 5 min of ischemia followed by 5 min of reperfusion. Mitochondria were isolated from myocardium at risk for assessment of the calcium retention capacity (CRC) (potentiometric technique) used here as an index of sensitivity of the mPTP to Ca2+ loading. In controls, the CRC was moderately reduced after ischemia alone, but reperfusion severely and time-dependently accelerated further CRC reduction. Preconditioning failed to modify mPTP opening during ischemia alone, but significantly improved CRC during reperfusion. This protective effect persisted as reperfusion evolved. These data suggest that (a) reperfusion strikingly increases the susceptibility to Ca2+-induced mPTP opening, and that (b) PC inhibits mPTP opening at reflow and throughout the first hours of reperfusion.
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Selkirk GA, McLellan TM, Wright HE, Rhind SG. Expression of intracellular cytokines, HSP72, and apoptosis in monocyte subsets during exertional heat stress in trained and untrained individuals. Am J Physiol Regul Integr Comp Physiol 2009; 296:R575-86. [DOI: 10.1152/ajpregu.90683.2008] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
This study examined intracellular cytokine, heat shock protein (HSP) 72, and cellular apoptosis in classic and inflammatory CD14+monocyte subsets during exertional heat stress (EHS). Subjects were divided into endurance-trained [TR; n = 12, peak aerobic power (V̇o2peak) = 70 ± 2 ml·kg lean body mass (LBM)−1·min−1] and sedentary-untrained (UT; n = 11, V̇o2peak= 50 ± 1 ml·kg LBM−1·min−1) groups before walking at 4.5 km/h with 2% elevation in a climatic chamber (40°C, 30% relative humidity) wearing protective clothing until exhaustion (Exh). Venous blood samples at baseline and 0.5°C rectal temperature increments (38.0, 38.5, 39.0, 39.5, and 40.0°C/Exh) were analyzed for cytokines (TNF-α, IL-1β, IL-6, IL-1ra, and IL-10) in CD14++CD16−/CD14+CD16+and HSP72/apoptosis in CD14Bri/CD14Dimsubsets. In addition, serum levels of extracellular (e)HSP72 were also examined. Baseline and Exh samples were separately stimulated with LPS (1 μg/ml) or heat shocked (42°C) and cultured in vitro for 2 h. A greater temperature-dependent increase in CD14+CD16+cells was observed in TR compared with UT subjects as well as a greater LPS tolerance following in vitro LPS stimulation. TNF-α and IL-1β cytokine expression was elevated in CD14+CD16+but not in CD14++CD16−cells. A greater induction of intracellular HSP72 and eHSP72 was observed in TR compared with UT subjects, which coincided with reduced apoptosis at Exh and following in vitro heat shock. Induced HSP in vitro was not uniform across CD14+subsets. Findings suggest that circulating CD14+CD16+, but not CD14++CD16−monocytes, contribute to the proinflammatory cytokine profiles observed during EHS. In addition, the enhanced HSP72 response in endurance-trained individuals may confer improved heat tolerance through both anti-inflammatory and anti-apoptotic mechanisms.
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Uncoupling protein-2 deficiency provides protection in a murine model of endotoxemic acute liver failure. Crit Care Med 2009; 37:215-22. [PMID: 19050629 DOI: 10.1097/ccm.0b013e31819260ae] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
OBJECTIVE Liver injury and cell death are prominent features in the pathogenesis of acute liver failure. Mitochondrial uncoupling protein 2 plays a controversial role in liver cell death through its involvement in the production of reactive oxygen species and adenosine triphosphate. DESIGN This randomized controlled animal study was designed to investigate the exact role of uncoupling protein 2 in the pathogenesis of endotoxemic acute liver failure. SETTING Research laboratory of an academic institution. SUBJECTS, INTERVENTIONS, AND MEASUREMENTS: Uncoupling protein 2+/+ and uncoupling protein 2-/- mice were challenged with D-galactosamine (Gal, 720 mg/kg intraperitoneally) and Escherichia coli lipopolysaccharide (10 microg/kg intraperitoneally) and studied 6 hrs thereafter (n = 5 per group). Control mice received physiologic saline (n = 5 per group). Analysis included in vivo fluorescence microscopy of hepatic microcirculation and hepatocellular apoptosis as well as plasma malondialdehyde concentrations as reactive oxygen species-dependent lipid peroxidation product and hepatic adenosine triphosphate levels. MAIN RESULTS Administration of Gal-lipopolysaccharide in uncoupling protein 2+/+ mice caused systemic cytokine release and malondialdehyde production. Further, it provoked marked hepatic damage, characterized by intrahepatic leukocyte recruitment (10.5 +/- 1.3 n/mm2 vs. 3.3 +/- 0.5 n/mm2), microvascular perfusion failure (33.1% +/- 1.6% vs. 2.3% +/- 0.4%), and adenosine triphosphate depletion (3.4 +/- 0.9 micromol/g vs. 6.4 +/- 0.9 micromol/g). Furthermore, uncoupling protein +/+ mice revealed a huge rise in cell apoptosis, given by high numbers of hepatocytes exhibiting nuclear chromatin fragmentation (44.9 +/- 11.5 n/mm2 vs. 0.0 +/- 0.0 n/mm2) and cleaved caspase-3 expression (1.24 +/- 0.24 vs. 0.06 +/- 0.04). Liver injury was coexistent with enzyme release (alanine aminotransferase 442 +/- 126 U/L vs. 57 +/- 12 U/L) and necrotic cell death. Of interest, Gal-lipopolysaccharide-exposed uncoupling protein 2-/- mice exhibited higher rates of hepatocellular apoptosis (135.6 +/- 46.0 n/mm2) as well as cleaved caspase-3 expression (1.75 +/- 0.25), however, preserved hepatic adenosine triphosphate (6.4 +/- 1.7), milder perfusion failure (24.5 +/- 2.4) and decreased leukocyte recruitment (2.7 +/- 0.2), less necrotic injury, lower transaminase levels (340 +/- 91), and finally better survival rates. CONCLUSION The higher adenosine triphosphate availability in uncoupling protein 2-deficient mice might allow hepatocytes to undergo apoptosis as an energy-consuming mode of cell death, while at the same time cellular adenosine triphosphate levels seem to increase hepatic resistance against harmful effects upon Gal-lipopolysaccharide exposure. As net result, uncoupling protein 2 deficiency provided protection under endotoxemic stress conditions, underlining the significant role of the bioenergetic status in critical illness.
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Papathanassoglou EDE, Bozas E, Giannakopoulou MD. Multiple organ dysfunction syndrome pathogenesis and care: a complex systems' theory perspective. Nurs Crit Care 2009; 13:249-59. [PMID: 18816311 DOI: 10.1111/j.1478-5153.2008.00289.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS AND OBJECTIVES To discuss multiple organ dysfunction syndrome (MODS) from a complex systems' theory perspective and to delineate a conceptual framework for the development and care of MODS. BACKGROUND MODS is an intricate and devastating manifestation of critical illness characterized by widespread aberrant molecular, cellular and systemic responses. DESIGN AND METHODS Narrative literature review (MEDLINE, CINAHL databases) and knowledge synthesis with the theoretical assertions of chaos and complex systems' theory. Cellular and systemic response paradoxes in MODS (including cellular hypoxia, cell death and signalling) are reviewed. RESULTS The diseased person is depicted as a complex adaptive system. The relevancy of some of the principles of complex chaotic systems' theory to the proposed model is illustrated, including sensitive dependence on initial conditions, emergence, attractors, self-organization, self-organized criticality and emerging order. The transition from life-supporting to death-related organismic responses is illustrated as a critical event in MODS and care implications are drawn. CONCLUSIONS Patient responses in MODS appear to conform to the principles of chaotic systems. Death is illustrated not as a consequence of homeostatic failure but as a 'deliberate' self-organized phenomenon entailing multiple dynamically evolving mechanisms. RELEVANCE TO CLINICAL PRACTICE Some of the principles of chaotic complex systems may need to be taken into account to advance care in MODS. An alternative theoretical perspective may support nurses to conceptualize both MODS and their role in a way that will help them to cope better with this devastating syndrome and develop practice.
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Abstract
Bacterial toxins cause cardiac dysfunction and death through an inflammatory process, but the mechanism remains unclear. Simvastatin is recognized as having anti-inflammatory properties beyond its lipid-lowering effects. We examined Staphylococcus aureus alpha-toxin in isolated heart and in vivo models and tested simvastatin's effects in sepsis. Isolated Langendorff-perfused rat hearts were exposed to a recirculating perfusate containing alpha-toxin (0.5 microg mL(-1)). Compared with controls, there was a significant increase in coronary perfusion pressure and fall in myocardial performance. Significant increases in p53 expression and apoptosis (1.3 +/- 0.5 to 7.1 +/- 1.4 terminal deoxynucleaotidyl transferase nick end labeling-positive cells; P < 0.05) compared with controls were observed, but markers of necrosis were similar. In parallel experiments, anaesthetized rats receiving alpha-toxin (40 microg kg(-1), i.v.) had in vivo hemodynamic parameters and serum markers of necrosis monitored for 4 h before the hearts were analyzed for histological change, p53 expression, and apoptosis. Over 4 h, alpha-toxin exposure produced substantial hemodynamic effects. In addition, p53 expression (0.2 +/- 0.2 to 7.1 +/- 0.5 p53-positive myocytes; P < 0.05), TNF-alpha levels, the degree of apoptosis, and markers of necrosis were all significantly increased compared with control animals. Pretreatment with simvastatin protected against alpha-toxin-induced sepsis associated with reduced p53, TNF-alpha, apoptosis, and necrosis. We found significant changes in systemic hemodynamics, coronary perfusion pressure, myocardial function, and increased p53 expression with apoptosis due to bacterial exotoxin. In vivo changes were significantly inhibited by pretreatment with simvastatin. We provide novel evidence for the mechanisms by which septicemia causes myocardial depression and hint at a potential role for simvastatin as an inhibitor of apoptosis in sepsis.
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Messaris E, Memos N, Chatzigianni E, Kataki A, Nikolopoulou M, Manouras A, Albanopoulos K, Konstadoulakis MM, Bramis J. Apoptotic death of renal tubular cells in experimental sepsis. Surg Infect (Larchmt) 2008; 9:377-88. [PMID: 18570579 DOI: 10.1089/sur.2006.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND AND PURPOSE Renal dysfunction attributable to sepsis was long considered a result of hemodynamic instability and subsequent local ischemia. Recent data show that apoptosis may be implicated also. The purpose of this study was to evaluate the role of apoptosis and the expression of the bax, bcl-2, caspase-8, and cytochrome c proteins in the renal parenchymal cells of rats with sepsis. METHODS Sepsis was induced using cecal ligation and puncture (CLP) in 62 male Wistar rats, which were euthanized 6, 12, 24, 36, 48, or 60 h later. Ten sham-treated animals served as a control group. Another group of 50 animals were subjected to CLP and then supervised for 60 h. Renal apoptosis was evaluated using light and transmission electron microscopy, in situ nick-end labeling (TUNEL), and flow cytometry using 7-amino-actinomycin D (7-AAD). Caspase-mediated apoptosis was assessed using M30 antibody. The expression of the apoptosis-regulator proteins B-cell lymphoma 2 (bcl-2), bcl-2-associated x protein (bax), caspase-8, and cytochrome c was detected immunohistochemically. RESULTS Sepsis increased inflammatory infiltration (p < 0.001) and necrosis (p < 0.001) in renal parenchyma. Apoptosis was significantly more common than in the kidneys of control animals (p = 0.02). Nuclei stained by the TUNEL technique were predominant in the tubular cells of non-survivors (p = 0.05). The time distribution of all types of cell death was increased significantly 6 h after the induction of sepsis, and declined subsequently. Caspase-generated cytokeratin 18 (CK18) new epitope (M30) was significantly more abundant in the kidneys of animals with sepsis than in control rats, with peaks at 6 h and 60 h post-procedure (p < 0.001). In addition, cells initiating apoptosis were significantly more common at 6 h than at 48 h post-CLP (p = 0.014). Caspase-8 protein immunodetection followed the same time pattern as cell death, increasing as early as 6 h post-CLP and decreasing thereafter (p = 0.013). Bax protein expression was elevated significantly early in the course of sepsis (p = 0.037), whereas the other members of the mitochondrial-dependent pathway remained constant. Animals dying from sepsis had a significantly greater prevalence of bax- (p = 0.037) and caspase-8- (p = 0.031) immunoreactive renal cells. CONCLUSION Apoptosis in renal tissue was significantly more common in animals with sepsis than in controls. The time distribution of cell death markers showed a consistent pattern, making early sepsis the likely initiator of the apoptotic events.
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Affiliation(s)
- Evangelos Messaris
- Laboratory of Surgical Research, First Department of Propaedeutic Surgery, Athens Medical School, Hippokration Hospital, Athens, Greece
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Delogu G, Famularo G, Tellan G, Marandola M, Antonucci A, Signore M, Marcellini S, Moretti S. Lymphocyte Apoptosis, Caspase Activation and Inflammatory Response in Septic Shock. Infection 2008; 36:485-7. [DOI: 10.1007/s15010-008-7070-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2007] [Accepted: 04/10/2008] [Indexed: 11/29/2022]
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Kidd LB, Schabbauer GA, Luyendyk JP, Holscher TD, Tilley RE, Tencati M, Mackman N. Insulin activation of the phosphatidylinositol 3-kinase/protein kinase B (Akt) pathway reduces lipopolysaccharide-induced inflammation in mice. J Pharmacol Exp Ther 2008; 326:348-53. [PMID: 18445780 DOI: 10.1124/jpet.108.138891] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Insulin is used to control pro-inflammatory hyperglycemia in critically ill patients. However, recent studies suggest that insulin-induced hypoglycemia may negate its beneficial effects in these patients. It is noteworthy that recent evidence indicates that insulin has anti-inflammatory effects that are independent of controlling hyperglycemia. To date, the mechanism by which insulin directly reduces inflammation has not been elucidated. It is well established that insulin activates phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt) signaling in many cell types. We and others have shown that this pathway negatively regulates LPS-induced signaling and pro-inflammatory cytokine production in monocytic cells. We hypothesized that insulin inhibits inflammation during endotoxemia by activation of the PI3K/Akt pathway. We used a nonhyperglycemic mouse model of endotoxemia to determine the effect of continuous administration of a low dose of human insulin on inflammation and survival. It is noteworthy that insulin treatment induced phosphorylation of Akt in muscle and adipose tissues but did not exacerbate lipopolysaccharide (LPS)-induced hypoglycemia. Insulin decreased plasma levels of interleukin-6, tumor necrosis factor-alpha, monocyte chemotactic protein 1 (MCP1)/JE, and keratinocyte chemoattractant, and decreased mortality. The PI3K inhibitor wortmannin abolished the insulin-mediated activation of Akt and the reduction of chemokine and interleukin-6 levels. We conclude that insulin reduces LPS-induced inflammation in mice in a PI3K/Akt-dependent manner without affecting blood glucose levels.
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Affiliation(s)
- Linda B Kidd
- The Department of Immunology, The Scripps Research Institute, La Jolla, California, USA
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Hsu HY, Wittemann S, Schneider EM, Weiss M, Joos TO. Suspension microarrays for the identification of the response patterns in hyperinflammatory diseases. Med Eng Phys 2008; 30:976-83. [PMID: 18313970 DOI: 10.1016/j.medengphy.2008.01.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2007] [Revised: 11/27/2007] [Accepted: 01/11/2008] [Indexed: 12/11/2022]
Abstract
Miniaturized and parallelized sandwich immunoassays allow the simultaneous analysis of a variety of parameters in a single experiment. Bead-based protein array systems or suspension microarrays are well-established multiplex sandwich immunoassay formats. To study inflammatory diseases, protein arrays can be used to analyze changes in plasma protein levels, such as cytokines, chemokines, soluble receptors, and matrix metalloproteinases. Using the bead-based Luminex system, multiplexed sandwich immunoassays have been developed to analyze the plasma concentrations of soluble receptors: sTNF-RI, sTNF-RII, sIL-2R, sgp130, sFas, sRAGE, sE-selectin, sICAM-1, sVCAM-1, sMIF-1 and sFasL. This newly established 11-plex soluble receptors assay demonstrated acceptable intra-assay and inter-assay precision, appropriate accuracy, and no crossreactivity between analytes. Using this assay, 100 plasma samples derived from 36 critically ill intensive care unit (ICU) patients with trauma or sepsis were analyzed for their soluble receptor plasma concentrations. Results obtained allowed grouping of patients' samples into a trauma and a sepsis group. Four candidate molecules: sFas, sICAM-1, sTNF-RI, and sTNF-RII had higher concentrations in patients with sepsis than in those with trauma, contributing the highest discriminatory values to define the nature of the inflammatory disease originating from pathogen-involved (sepsis) or pathogen-independent inflammation.
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Affiliation(s)
- Hsin-Yun Hsu
- NMI Natural and Medical Sciences Institute at the University of Tübingen, Reutlingen, Germany
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Abstract
IL-19, a proinflammatory cytokine, belongs to the IL-10 family. IL-19 is induced in systemic inflammatory response syndrome, but its pathophysiological function in sepsis is unclear. Our aim was to determine the roles of IL-19 in endotoxin-induced tissue damage in vivo and in vitro. We examined serum levels of IL-19 in sepsis patients and healthy volunteers, determined the in vitro effects of IL-19 on lung epithelial cells, liver cells, and neutrophils, and analyzed the tissue expression of IL-19 and its receptors in murine endotoxic shock. Electroporation-mediated gene transfer of mouse IL-19-soluble receptor plasmid DNA was used to determine the effects of IL-19 depletion in preventing endotoxic shock-induced tissue damage in mice. We found that serum levels of IL-19 were higher in patients than in healthy volunteers (n = 28, P = 0.001). IL-19 induced apoptosis in lung epithelial cells and reactive oxygen species production in liver cells in vitro. IL-19 also promoted neutrophil chemotaxis, reduced neutrophil apoptosis, and induced the production of proinflammatory cytokines and chemokines (IL-1[beta], IL-6, IL-8, CCL5, and CXCL9) in lung epithelial cells. In LPS-challenged mice, transcripts of IL-19 and its receptors were up-regulated in heart, lung, liver, and kidney tissue. Neutrophil infiltration in lung and liver tissue, and serum levels of alanine transaminase and aspartate transaminase, were lower in mice electroporated with IL-19-soluble receptor plasmid DNA before LPS treatment compared with control mice. These results suggest that up-regulated IL-19 may be involved in lung and liver tissue injury in murine endotoxic shock.
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Clementsen T, Reikerås O. Cytokine patterns after tourniquet-induced skeletal muscle ischaemia reperfusion in total knee replacement. Scandinavian Journal of Clinical and Laboratory Investigation 2007; 68:154-9. [PMID: 17963155 DOI: 10.1080/00365510701528587] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVE Extremity surgery performed under tourniquet control causes one of the most common forms of skeletal muscle ischaemia-reperfusion injury in clinical practice. The aim of this study was to investigate the systemic and local inflammatory response after tourniquet-induced skeletal muscle ischaemia-reperfusion injury in patients undergoing total knee replacement. It was our hypothesis that local inflammatory responses in a surgical wound under tourniquet-induced ischaemia cause an excessive overflow of cytokines to the systemic circulation in the reperfusion phase. MATERIAL AND METHODS Blood was sampled before and after surgery in nine patients given total knee replacement. Samples from ischaemic and non-ischaemic limbs and from drained blood were analysed for pro-inflammatory and anti-inflammatory cytokines. RESULTS Surgery induced significant increases of IL-6 (p = 0.007) in the non-ischaemic (systemic) limb and in drained blood (p = 0.032), with highest levels 4 h after operation. The increased IL-6 in the ischaemic limb was non-significant. IL-1 beta was not detectable under surgery, from either the traumatized limb or from the non-traumatized limb, nor were TNFalpha and IL-10 significantly influenced by surgery. CONCLUSIONS Knee replacement trauma performed under ischaemia, is associated with modest systemic inflammatory reactions with no spillover of increased IL-6 from the traumatized area in the reperfusion phase.
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Affiliation(s)
- T Clementsen
- Department of Orthopaedics, Rikshospitalet-Radiumhospitalet Medical Centre, University of Oslo, Oslo, Norway.
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Abstract
Despite the fact that septic patients exhibit altered cardiac function, it is not considered a major pathology during sepsis. Thus, the molecular mechanisms underlying sepsis-induced myocardial dysfunction have not been studied extensively. In a polymicrobial septic rat model, +dP/dt and -dP/dt on day 1 were not altered but found depressed later, i.e., at 3 and 7 days postsepsis. Diastolic dysfunction characterized by an elevation of the time constant of left ventricular relaxation, tau, was evident at 1, 3, and 7 days postsepsis. Recent data from our laboratory demonstrated that sepsis-induced cardiodynamic alterations correlated with upregulation of TNF receptor-associated death domain, Bax, Smac (both mitochondrial and cytosolic fractions), total nuclear factor kappaB expression, p38-mitogen-activated protein kinase and c-Jun N-terminal kinase phosphorylation, and cytochrome c levels in the rat heart at 3 and 7 days postsepsis. Data from various laboratories emphasized that molecular myocardial alteration, which occurs during early and late stages of sepsis, needs to be elucidated thoroughly. A poor understanding of myocardial signaling during early sepsis could be one of the main reasons for limited success of pharmacotherapeutic options for sepsis. We anticipate that an increased understanding of pathophysiological mechanisms leading to sepsis-induced myocardial dysfunction would generate new enthusiasm among various research groups in this area of research.
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Affiliation(s)
- Avadhesh C Sharma
- Cardionome Laboratory, Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246, USA.
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Pétillot P, Lahorte C, Bonanno E, Signore A, Lancel S, Marchetti P, Vallet B, Slegers G, Neviere R. Annexin V detection of lipopolysaccharide-induced cardiac apoptosis. Shock 2007; 27:69-74. [PMID: 17172983 DOI: 10.1097/01.shk.0000235085.56100.38] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Acute inflammatory response to lipopolysaccharide (LPS) exposure is typically associated with cardiac myocyte apoptosis, which is difficult to quantify because of heart tissue specificity. We report here that radioiodinated Annexin V (I-AnxV), a specific ligand of phosphatidylserine exposed by apoptotic cells, allows tissue detection of apoptosis in LPS-treated rat hearts. Heart I-AnxV uptake was significantly increased in all cardiac territories of LPS-treated rats. In contrast, I-human serum albumin myocardial uptake was only slightly increased in LPS-treated rat hearts, suggesting limited changes in vascular protein permeability. Autoradiography of endotoxin-treated rat heart sections with I-AnxV in association with deoxynucleotidyl transferase-mediated dUTP-biotin nick-end labeling and caspase 3 staining allows identification of double positive cardiac myocytes. Inhibition of apoptosis by caspase inhibitors (i.e., ZVAD.fmk and DEVD.cmk) reduced I-AnxV myocardial uptake in LPS-treated rats. Eventually, endotoxin-treated rats displayed pathological uptake of Tc-annexin in the cardiac mediastinal region whereas zVAD.fmk reduced Tc-annexin mediastinal uptake. Our results show that radioactive I-AnxV signal emerging from LPS-treated rat hearts could be related to the activation of caspase-dependent apoptotic pathway in cardiac myocytes.
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Affiliation(s)
- Patrice Pétillot
- INSERM Unité 814, Faculty of Medicine, Place de Verdun, Lille, France
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Pirarat N, Maita M, Endo M, Katagiri T. Lymphoid apoptosis in Edwardsiella tarda septicemia in tilapia, Oreochromis niloticus. FISH & SHELLFISH IMMUNOLOGY 2007; 22:608-16. [PMID: 17046284 DOI: 10.1016/j.fsi.2006.08.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2006] [Revised: 07/14/2006] [Accepted: 08/03/2006] [Indexed: 05/12/2023]
Abstract
The present study revealed a relationship between the kinetic change of apoptosis and the inflammatory response during experimental intraperitoneal infection with Edwardsiella tarda as a septicemic model. The morphological changes of apoptotic cells including cellular shrinkage, condensed nuclear chromatin, nuclear fragmentation and membrane blebbing were detected by light and transmission electron microscopy. TUNEL and agarose gel electrophoresis confirmed the fragmentation of DNA in the apoptotic cells. Apoptosis was highly detected in lymphoid organs prior to the inflammatory process and gradually decreased after an extensive inflammatory response. Apoptosis in thymus and spleen was extensive and an in vitro study revealed that lymphocytes were the major cell population which underwent apoptosis. The result suggests that E. tarda-induced systemic immunosuppression via lymphocyte apoptosis as determined by suppression of the systemic inflammatory response during an initial step of generalized septicemia.
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Affiliation(s)
- Nopadon Pirarat
- Department of Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand
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Antonopoulou A, Raftogiannis M, Giamarellos-Bourboulis EJ, Koutoukas P, Sabracos L, Mouktaroudi M, Adamis T, Tzepi I, Giamarellou H, Douzinas EE. Early apoptosis of blood monocytes is a determinant of survival in experimental sepsis by multi-drug-resistant Pseudomonas aeruginosa. Clin Exp Immunol 2007; 149:103-8. [PMID: 17488299 PMCID: PMC1942040 DOI: 10.1111/j.1365-2249.2007.03392.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Apoptosis of blood monocytes was studied in experimental sepsis by multi-drug-resistant Pseudomonas aeruginosa. Thirty-six rabbits were used, divided into the following groups: A (n = 6), sham; B (n = 6), administered anaesthetics; and C (n = 24), acute pyelonephritis induced after inoculation of the test isolate in the renal pelvis. Blood was sampled at standard time intervals for estimation of tumour necrosis factor (TNF)-alpha and isolation of monocytes. Half the monocytes were incubated and the other half was lysed for estimation of the cytoplasmic activity of caspase-3 by a kinetic chromogenic assay. No animal in groups A and B died; those in group C were divided into two subgroups, CI (n = 8) with present activity of caspase-3 of blood monocytes at 3.5 h and CII (n = 16) with absent activity. Their median survival was 2.0 and 3.5 days, respectively (P = 0.0089). Ex vivo secretion of TNF-alpha from monocytes was higher by monocytes of subgroup CII than subgroup CI at 3.5 h (P = 0.039) and of group A than CII at 48 h (P = 0.010). Median change of caspase-3 activity between 3.5 and 24 h of sampling was 56.1 and -5.8 pmol/min per 10(4) cells for subgroups CI and CII (P = 0.040), respectively. Respective changes between 3.5 and 48 h were 28 981.0 and 0 pmol/min per 10(4) cells (P = 0.036). Early induction of apoptosis in blood monocytes is of prime importance for the survival of the septic host and might be connected to changes of monocyte potential for the secretion of TNF-alpha.
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Affiliation(s)
- A Antonopoulou
- 4th Department of Internal Medicine, University of Athens, Medical School, Greece
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Johnson SB, Lissauer M, Bochicchio GV, Moore R, Cross AS, Scalea TM. Gene expression profiles differentiate between sterile SIRS and early sepsis. Ann Surg 2007; 245:611-21. [PMID: 17414611 PMCID: PMC1877042 DOI: 10.1097/01.sla.0000251619.10648.32] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
INTRODUCTION The systemic inflammatory response syndrome (SIRS) occurs frequently in critically ill patients and presents similar clinical appearances despite diverse infectious and noninfectious etiologies. Despite similar phenotypic expression, these diverse SIRS etiologies may induce divergent genotypic expressions. We hypothesized that gene expression differences are present between sepsis and uninfected SIRS prior to the clinical appearance of sepsis. METHODS Critically ill uninfected SIRS patients were followed longitudinally for the development of sepsis. All patients had whole blood collected daily for gene expression analysis by Affymetrix Hg_U133 2.0 Plus microarrays. SIRS patients developing sepsis were compared with those remaining uninfected for differences in gene expression at study entry and daily for 3 days prior to conversion to sepsis. Acceptance criteria for differentially expressed genes required: >1.2 median fold change between groups and significance on univariate and multivariate analysis. Differentially expressed genes were annotated to pathways using DAVID 2.0/EASE analysis. RESULTS A total of 12,782 (23.4%) gene probes were differentially expressed on univariate analysis 0 to 48 hours before clinical sepsis. 626 (1.1%) probes met acceptance criteria, corresponding to 459 unique genes, 65 (14.2%) down and 395 (85.8%) up expressed. These genes annotated to 10 pathways that functionally categorized to 4 themes involving innate immunity, cytokine receptors, T cell differentiation, and protein synthesis regulation. CONCLUSIONS Sepsis has a unique gene expression profile that is different from uninfected inflammation and becomes apparent prior to expression of the clinical sepsis phenotype.
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Affiliation(s)
- Steven B Johnson
- R. Adams Cowley Shock Trauma Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
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Fialkow L, Fochesatto Filho L, Bozzetti MC, Milani AR, Rodrigues Filho EM, Ladniuk RM, Pierozan P, de Moura RM, Prolla JC, Vachon E, Downey GP. Neutrophil apoptosis: a marker of disease severity in sepsis and sepsis-induced acute respiratory distress syndrome. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2007; 10:R155. [PMID: 17092345 PMCID: PMC1794458 DOI: 10.1186/cc5090] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2006] [Revised: 09/23/2006] [Accepted: 11/08/2006] [Indexed: 02/08/2023]
Abstract
Introduction Apoptosis of neutrophils (polymorphonuclear neutrophils [PMNs]) may limit inflammatory injury in sepsis and acute respiratory distress syndrome (ARDS), but the relationship between the severity of sepsis and extent of PMN apoptosis and the effect of superimposed ARDS is unknown. The objective of this study was to correlate neutrophil apoptosis with the severity of sepsis and sepsis-induced ARDS. Methods A prospective cohort study was conducted in intensive care units of three tertiary hospitals in Porto Alegre, southern Brazil. Fifty-seven patients with sepsis (uncomplicated sepsis, septic shock, and sepsis-induced ARDS) and 64 controls were enrolled. Venous peripheral blood was collected from patients with sepsis within 24 hours of diagnosis. All surgical groups, including controls, had their blood drawn 24 hours after surgery. Control patients on mechanical ventilation had blood collected within 24 hours of initiation of mechanical ventilation. Healthy controls were blood donors. Neutrophils were isolated, and incubated ex vivo, and apoptosis was determined by light microscopy on cytospun preparations. The differences among groups were assessed by analysis of variance with Tukeys. Results In medical patients, the mean percentage of neutrophil apoptosis (± standard error of the mean [SEM]) was lower in sepsis-induced ARDS (28% ± 3.3%; n = 9) when compared with uncomplicated sepsis (57% ± 3.2%; n = 8; p < 0.001), mechanical ventilation without infection, sepsis, or ARDS (53% ± 3.0%; n = 11; p < 0.001) and healthy controls (69% ± 1.1%; n = 33; p < 0.001) but did not differ from septic shock (38% ± 3.7%; n = 12; p = 0.13). In surgical patients with sepsis, the percentage of neutrophil apoptosis was lower for all groups when compared with surgical controls (52% ± 3.6%; n = 11; p < 0.001). Conclusion In medical patients with sepsis, neutrophil apoptosis is inversely proportional to the severity of sepsis and thus may be a marker of the severity of sepsis in this population.
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Affiliation(s)
- Léa Fialkow
- Department of Internal Medicine, Faculty of Medicine, Federal University of Rio Grande do Sul, Rua Ramiro Barcelos n° 2400, 4° andar, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
- Intensive Care Unit, Intensive Care Division, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos n° 2350, Porto Alegre, Rio Grande do Sul, 90035-903, Brazil
| | - Luciano Fochesatto Filho
- Department of Internal Medicine, Faculty of Medicine, Federal University of Rio Grande do Sul, Rua Ramiro Barcelos n° 2400, 4° andar, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
| | - Mary C Bozzetti
- Department of Social Medicine, Faculty of Medicine, Federal University of Rio Grande do Sul, Rua Ramiro Barcelos n° 2400, 4° andar, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
| | - Adriana R Milani
- Department of Internal Medicine, Faculty of Medicine, Federal University of Rio Grande do Sul, Rua Ramiro Barcelos n° 2400, 4° andar, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
| | - Edison M Rodrigues Filho
- Intensive Care Unit, Intensive Care Division, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos n° 2350, Porto Alegre, Rio Grande do Sul, 90035-903, Brazil
- Intensive Care Unit of Trauma and Neurosurgery, Hospital Cristo Redentor, Grupo Hospitalar Conceição, Rua Domingos Rubbo n° 20, Porto Alegre, Rio Grande do Sul, 91040-000, Brazil
- Intensive Care Unit, Hospital Dom Vicente Scherer, Complexo Hospitalar Santa Casa de Porto Alegre, Rua Annes Dias n° 285, Porto Alegre, Rio Grande do Sul, 90020-090, Brazil
| | - Roberta M Ladniuk
- Department of Internal Medicine, Faculty of Medicine, Federal University of Rio Grande do Sul, Rua Ramiro Barcelos n° 2400, 4° andar, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
| | - Paula Pierozan
- Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga n° 2752, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
| | - Rafaela M de Moura
- Faculty of Pharmacy, Pontifícia Universidade Católica do Rio Grande do Sul, Avenida Ipiranga n° 6681 Prédio 12, Bloco A, sala 202, Porto Alegre, Rio Grande do Sul, 90619-900, Brazil
| | - João C Prolla
- Department of Internal Medicine, Faculty of Medicine, Federal University of Rio Grande do Sul, Rua Ramiro Barcelos n° 2400, 4° andar, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
| | - Eric Vachon
- Division of Respirology, Department of Medicine and Toronto General Hospital Research Institute of the University Health Network and University of Toronto, 11C-1183 NCSB, Toronto General Hospital, 585 University Avenue, Toronto, ON, M5G 2N2, Canada
| | - Gregory P Downey
- Division of Respirology, Department of Medicine and Toronto General Hospital Research Institute of the University Health Network and University of Toronto, 11C-1183 NCSB, Toronto General Hospital, 585 University Avenue, Toronto, ON, M5G 2N2, Canada
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Carlson DE, Nguyen PX, Soane L, Fiedler SM, Fiskum G, Chiu WC, Scalea TM. HYPOTENSIVE HEMORRHAGE INCREASES CALCIUM UPTAKE CAPACITY AND BCL-XL CONTENT OF LIVER MITOCHONDRIA. Shock 2007; 27:192-8. [PMID: 17224795 DOI: 10.1097/01.shk.0000238067.77202.a8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We tested the hypothesis that the response of mitochondrial uptake of calcium and content of Bcl proteins to reversible hemorrhagic shock increases the vulnerability for hepatocellular death. Pentobarbital-anesthetized rats were bled to a mean arterial pressure of 30 to 40 mmHg for 1 h. A subset was then resuscitated (isotonic sodium chloride solution, three times shed volume). Liver mitochondria were isolated at the end of hemorrhage and 1.5 h after the onset of resuscitation. Resuscitation accelerated mitochondrial respiration in the presence of adenosine diphosphate (state 3) above control (P<0.01). The respiratory control ratio ([RCR] state 3/state 4) was calculated using the respiratory rate in the presence of carboxyatractyloside (state 4). The RCR was depressed at the end of hemorrhage and recovered completely in response to resuscitation (P<0.05). The mitochondrial capacity for calcium uptake increased at the end of hemorrhage and remained greater than control (P<0.01) after resuscitation when plasma ornithine carbamoyltransferase (an index of hepatocellular injury) was greater than control (P<0.05). At this time, the capacity for calcium uptake was correlated with plasma ornithine carbamoyltransferase (r=0.819, P<0.01). Mitochondrial content of Bcl-xL, an antiapoptotic protein, was increased at the end of hemorrhage (P<0.03) with no further change after resuscitation and no change in mitochondrial Bak, a proapoptotic protein. Thus, mitochondrial mechanisms are triggered early during reversible hypovolemia that may limit the intensity of intracellular calcium signaling and its potential to cause cellular injury and death.
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Affiliation(s)
- Drew E Carlson
- Program in Trauma and Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA.
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Giamarellos-Bourboulis EJ, Routsi C, Plachouras D, Markaki V, Raftogiannis M, Zervakis D, Koussoulas V, Orfanos S, Kotanidou A, Armaganidis A, Roussos C, Giamarellou H. Early apoptosis of blood monocytes in the septic host: is it a mechanism of protection in the event of septic shock? CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2006; 10:R76. [PMID: 16696867 PMCID: PMC1550931 DOI: 10.1186/cc4921] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2006] [Revised: 03/28/2006] [Accepted: 04/18/2006] [Indexed: 01/28/2023]
Abstract
Introduction Based on the central role of the triggering of monocytes for the initiation of the septic cascade, it was investigated whether apoptosis of blood monocytes in septic patients is connected to their final outcome. Methods Blood monocytes were isolated from 90 patients with septic syndrome due to ventilator-associated pneumonia on days 1, 3, 5 and 7 from the initiation of symptoms. Apoptosis was defined after incubation with annexin-V-fluorescein isothiocyanate and propidium iodine and reading by a flow cytometer. The function of first-day monocytes was evaluated from the concentrations of tumour necrosis factor alpha (TNFα) and IL-6 in supernatants of cell cultures after triggering with endotoxins. TNFα, IL-6 and IL-8 were estimated in serum by an enzyme immunoassay. Results Mortality rates of patients with apoptosis ≤50% compared with patients with apoptosis >50% were 49.12% and 15.15%, respectively (P < 0.0001). Kaplan-Meier analysis showed a 28-day survival benefit in patients with septic shock and monocyte apoptosis >50% compared with those patients with apoptosis ≤50% (P = 0.0032). Production of IL-6 by monocytes on the first day by patients with apoptosis ≤50% was similar compared with monocytes isolated from healthy controls. Serum concentrations of TNFα were higher in patients with monocyte apoptosis ≤50% and septic shock compared with patients with apoptosis >50% on day 7; similar findings occurred for serum IL-6 on days 1 and 7 and for serum IL-8 on days 1 and 5. Conclusion Early apoptosis of monocytes upon presentation of clinical signs of sepsis is connected to a favourable outcome. These findings are of particular importance for the patient with septic shock, where they might constitute a mechanism of pathogenesis.
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Affiliation(s)
| | - Christina Routsi
- 1st Department of Critical Care, University of Athens, Medical School, Greece
| | - Diamantis Plachouras
- 4th Department of Internal Medicine, University of Athens, Medical School, Greece
| | - Vassiliki Markaki
- 1st Department of Critical Care, University of Athens, Medical School, Greece
| | - Maria Raftogiannis
- 4th Department of Internal Medicine, University of Athens, Medical School, Greece
| | - Dimitrios Zervakis
- 1st Department of Critical Care, University of Athens, Medical School, Greece
| | - Vassilios Koussoulas
- 4th Department of Internal Medicine, University of Athens, Medical School, Greece
| | - Stylianos Orfanos
- 2nd Department of Critical Care, University of Athens, Medical School, Greece
| | - Anastasia Kotanidou
- 1st Department of Critical Care, University of Athens, Medical School, Greece
| | | | - Charis Roussos
- 1st Department of Critical Care, University of Athens, Medical School, Greece
| | - Helen Giamarellou
- 4th Department of Internal Medicine, University of Athens, Medical School, Greece
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Ashare A, Monick MM, Powers LS, Yarovinsky T, Hunninghake GW. Severe bacteremia results in a loss of hepatic bacterial clearance. Am J Respir Crit Care Med 2006; 173:644-52. [PMID: 16399991 PMCID: PMC2662948 DOI: 10.1164/rccm.200509-1470oc] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
RATIONALE Although it has been postulated that liver injury results in impaired clearance of bacteria from the blood, no prior study has evaluated hepatic bacterial clearance during sepsis. OBJECTIVES We hypothesized that liver injury during the evolution of sepsis would result in impaired hepatic bacterial clearance. METHODS Mild and severe bacteremia were generated in C57BL/6 mice by low- and high-dose intratracheal inoculation with Pseudomonas aeruginosa. MEASUREMENTS AND MAIN RESULTS The mortality rates with mild and severe bacteremia were 20% and 60%, respectively. Hepatic bacterial clearance was preserved throughout the evolution of mild bacteremia but was lost late with severe bacteremia. The loss of hepatic bacterial clearance resulted in increased systemic bacteremia and mortality. Pretreatment with a caspase inhibitor resulted in preservation of hepatic bacterial clearance with severe bacteremia and eventual control of the bacteremia. When Kupffer cells were ablated before the onset of bacteremia, there was a loss of hepatic bacterial clearance. This converted an initially mild bacteremia into severe bacteremia with increased organ injury and mortality. CONCLUSIONS These observations suggest that hepatic bacterial clearance may be lost during the evolution of sepsis, resulting in a failure to control bacteremia. Thus, the capacity of the liver to clear bacteria is an important determinant of the outcome in sepsis.
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Affiliation(s)
- Alix Ashare
- Division of Pulmonary, Critical Care, and Occupational Medicine, University of Iowa College of Medicine, 200 Hawkins Drive, C-33 GH, Iowa City, IA 52242, USA.
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48
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Guzman EA, Rudnicki M. Intricacies of host response in acute pancreatitis. J Am Coll Surg 2005; 202:509-19. [PMID: 16500256 DOI: 10.1016/j.jamcollsurg.2005.10.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2005] [Revised: 10/11/2005] [Accepted: 10/11/2005] [Indexed: 12/25/2022]
Affiliation(s)
- Edgar A Guzman
- Department of Surgery, University of Illinois/Metropolitan Group Hospitals Residency Program, Chicago, IL, USA
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49
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Rocha PN, Plumb TJ, Robinson LA, Spurney R, Pisetsky D, Koller BH, Coffman TM. Role of thromboxane A2 in the induction of apoptosis of immature thymocytes by lipopolysaccharide. CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY 2005; 12:896-903. [PMID: 16085905 PMCID: PMC1182190 DOI: 10.1128/cdli.12.8.896-903.2005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Lipopolysaccharide (LPS) causes apoptotic deletion of CD4(+) CD8(+) thymocytes, a phenomenon that has been linked to immune dysfunction and poor survival during sepsis. Given the abundance of thromboxane-prostanoid (TP) receptors in CD4(+) CD8(+) thymocytes and in vitro evidence that thromboxane A(2) (TXA(2)) causes apoptosis of these cells, we tested whether enhanced generation of TXA(2) plays a role in LPS-induced thymocyte apoptosis. Mice injected with 50 micro LPS intraperitoneally displayed a marked increase in generation of TXA(2) and prostaglandin E(2) in the thymus as well as apoptotic deletion of CD4(+) CD8(+) thymocytes. Administration of indomethacin or rofecoxib inhibited prostanoid synthesis but did not affect thymocyte death. In contrast, thymocyte apoptosis in response to LPS was significantly attenuated in TP-deficient mice. These studies indicate that TXA(2) mediates a portion of apoptotic thymocyte death caused by LPS. The absence of an effect of global inhibition of prostanoid synthesis suggests a complex role for prostanoids in this model.
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Affiliation(s)
- Paulo N Rocha
- Division of Nephrology, Duke University, Durham VA Medical Centers, Durham, North Carolina 27705, USA
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50
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Morello S, Vellecco V, Roviezzo F, Maffia P, Cuzzocrea S, Cirino G, Cicala C. A protective role for proteinase activated receptor 2 in airways of lipopolysaccharide-treated rats. Biochem Pharmacol 2005; 71:223-30. [PMID: 16300746 DOI: 10.1016/j.bcp.2005.10.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2005] [Revised: 10/05/2005] [Accepted: 10/06/2005] [Indexed: 02/06/2023]
Abstract
Proteinase activated receptor-2 (PAR2), a seven transmembrane domain G protein coupled receptor, is expressed on airway epithelium and smooth muscle cells and over-expressed in human airways under pathological conditions, such as asthma and chronic obstructive pulmonary disease (COPD). However, the role of PAR2 in airways has not yet been defined. Aim of the present study, was to evaluate the in vitro rat bronchial response to a synthetic peptide activating PAR2 (PAR2-AP; SLIGRL), following an in vivo treatment with bacterial lipopolysaccharide (LPS). Bronchi from LPS-treated animals showed an increased relaxant response to PAR2-AP, compared to naïve animals, the effect was maximum after 20-h pre-treatment and reduced by epithelium removal. Western blot analysis showed an increased PAR2 protein expression on bronchi removed 20h after LPS treatment. PAR2-AP-induced bronchorelaxation was inhibited by ibuprofen, by the selective cyclooxygenase2 (COX-2) inhibitor, diisopropyl fluorophosphate (DFP) and partially by the calcitonin gene related peptide (CGRP) antagonist, rat-CGRP([8-37]). Furthermore, there was a strong immunoreactivity for COX-2 on bronchial epithelium of LPS-treated rats. Prostaglandin E2 (PGE2) tissue release and CGRP tissue content were significantly increased following tissue incubation with PAR2-AP. The in vivo LPS treatment in rats strongly increases the bronchorelaxant effect of PAR2-AP, this effect correlates with an increased tissue protein receptor expression and the COX-2 localization on bronchial epithelium. Our work supports a role for PAR2 as a defence mechanism aimed to preserve bronchial functionality under systemic inflammatory conditions; both COX-2-derived PGE2 and CGRP are involved in this effect.
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Affiliation(s)
- Silvana Morello
- Department of Experimental Pharmacology, University of Naples Federico II, via D. Montesano 49, 80131 Naples, Italy
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