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Heme oxygenase-1 induction by cobalt protoporphyrin enhances fever and inhibits pyrogenic tolerance to lipopolysaccharide.

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Heme oxygenase-1 (HO-1) is an enzyme that catalyzes degradation of the heme and regulates its availability for newly synthetized hemeproteins such as cyclooxygenases, NO synthases and cytochrome P450. Moreover, HO-1 activity modulates synthesis of cytokines and prostaglandins. All of these factors

Inactivation of Dengue and Yellow Fever viruses by heme, cobalt-protoporphyrin IX and tin-protoporphyrin IX.

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OBJECTIVE To investigate the effect of heme, cobalt-protoporphyrin IX and tin-protoporphyrin IX (CoPPIX and SnPPIX), macrocyclic structures composed by a tetrapyrrole ring with a central metallic ion, on Dengue Virus (DENV) and Yellow Fever Virus (YFV) infection. RESULTS Treatment of HepG2 cells

Heme oxygenase-1 (Hsp32) is involved in the protection of small intestine by whole body mild hyperthermia from ischemia/reperfusion injury in rat.

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OBJECTIVE The aim of the present study was to explore whether heme oxygenase-1 (HO-1) is involved in the hyperthermia-provided protection of the small intestine from ischemia/reperfusion injury in rats. METHODS Intestinal damage was induced in male Sprague-Dawley rats by clamping both the superior

Coordinated expression and mechanism of induction of HSP32 (heme oxygenase-1) mRNA by hyperthermia in rat organs.

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Heme oxygenase isozymes, HO-1 and HO-2, catalyze the cleavage of heme b (Fe-protoporphyrin-IX) at the alpha-meso carbon bridge to form the antioxidant, biliverdin IX alpha, and the putative cellular messenger, carbon monoxide. HO-1 is a heat shock (HSP32) or stress protein, while HO-2 is a

Mechanism of porphyrin-induced sonodynamic effect: possible role of hyperthermia.

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The biological effects of ultrasound have been investigated vigorously for various applications including the thermal coagulation of tissues, the opening of tight junctions, and localized gene or drug introduction. The synergistic cell killing effect of ultrasound and porphyrin derivatives, the

Regulation of inducible heme oxygenase and cyclooxygenase isozymes in a mouse model of spotted fever group rickettsiosis.

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Vascular endothelial cells (ECs) lining the blood vessels are the preferred primary targets of pathogenic Rickettsia species in the host. In response to oxidative stress triggered by infection, ECs launch defense mechanisms such as expression of heme oxygenase-1 (HO-1). Previous evidence from an

Hyperthermia ameliorates 2,4,6-trinitrobenzene sulphonic acid-induced colitis in rats: the role of heat shock proteins.

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OBJECTIVE Hyperthermia is known to protect against cellular injury through the expression of heat shock proteins. In this study, the therapeutic effects of hyperthermia on experimental colitis in the rat were evaluated. METHODS Male Wistar rats were given a single intracolonic injection of

Malaria, hookworms and recent fever are related to anemia and iron status indicators in 0- to 5-y old Zanzibari children and these relationships change with age.

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In Zanzibar and other tropical regions, iron deficiency, malaria and multiple helminth infections coexist. We addressed the following questions: 1) What are the predictors of low hemoglobin in Zanzibari preschool children? 2) Are indicators of iron status informative in this population? 3) Does

Synergistic increase in osteosarcoma cell sensitivity to photodynamic therapy with aminolevulinic acid hexyl ester in the presence of hyperthermia.

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OBJECTIVE We observed that two osteosarcoma cell lines from the same tumor displayed marked differences in their sensitivities to photodynamic therapy (PDT) with aminolevulinic acid hexyl ester (hALA-PDT). We investigated why these two closely related lines had different hALA-PDT sensitivities and

Investigation of cross-resistance to a range of photosensitizers, hyperthermia and UV light in two radiation-induced fibrosarcoma cell strains resistant to photodynamic therapy in vitro.

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Two distinct photodynamic therapy-resistant variants of the murine radiation-induced fibrosarcoma (RIF) cell line have been isolated. One strain displayed relative resistance over the parental RIF-1 strain to treatment with the porphyrin-based compound, polyhaematoporphyrin (PHP), whereas the other

Enhancement of the effect of 5-aminolevulinic acid-based photodynamic therapy by simultaneous hyperthermia.

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In the present study, we have investigated a combination of photodynamic therapy (PDT) using 5-aminolevulinic acid (ALA) and simultaneous hyperthermia (HT) on osteosarcoma (HOSM-1) cells, squamous cell carcinoma (KB) cells and fibroblasts (HF), including an assessment of the differences in the

Co-protoporphyrin IX and Sn-protoporphyrin IX inactivate Zika, Chikungunya and other arboviruses by targeting the viral envelope.

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The global situation of diseases transmitted by arthropod-borne viruses such as Dengue (DENV), Yellow Fever (YFV), Chikungunya (CHIKV) and Zika (ZIKV) viruses is alarming and treatment of human infection by these arboviruses faces several challenges. The discovery of broad-spectrum antiviral

[Results of preoperative autotransfusion with ferrous ascorbate prophylaxis in orthopedic surgery patients].

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OBJECTIVE Restrictive erythropoiesis caused by iron deficiency may hinder pre-deposit autotransfusion in surgical procedures. In order to evaluate the response to prophylactic ferrous ascorbate, a prospective study was conducted on patients subjected to orthopaedic surgery and

Impaired heme synthesis in a family with Pelger-Huët anomaly, recurrent abdominal pain attacks and impaired neutrophil motility in vitro.

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Heme synthesis was studied by measuring the activity of delta-aminolevulinic acid synthase (AmLev synthase) in granulocytes, the activity of delta-aminolevulinic acid dehydratase (AmLev dehydratase) and of uroporphyrinogen I synthase in erythrocytes as well as the concentrations of coproporphyrin

Heme oxygenase-1 aggravates heat stress-induced neuronal injury and decreases autophagy in cerebellar Purkinje cells of rats.

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We previously reported that heat stroke induces autophagy as a protection mechanism against neurodegeneration in the brain. Heme oxygenase (HO)-1 is a stress protein and can be induced by heat stress (HS). Cerebellar Purkinje cells are selectively vulnerable to heat-induced injury. In this study, we

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