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Mišir M, Renić M, Novak S, Mihalj M, Ćosić A, Vesel M, Drenjančević I. Hyperbaric oxygenation and 20-hydroxyeicosatetreanoic acid inhibition reduce stroke volume in female diabetic Sprague-Dawley rats. Exp Physiol 2017; 102:1596-1606. [PMID: 28940693 DOI: 10.1113/ep086402] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 08/29/2017] [Indexed: 12/20/2022]
Abstract
NEW FINDINGS What is the central question of this study? Is there a beneficial effect and what are the mechanisms of acute and multiple hyperbaric oxygenation (HBO2 ) exposures on the outcome of cerebral tissue injury induced by a transient middle cerebral artery occlusion model in diabetic female rats? Are 20-hydroxyeicosatetreanoic acid and epoxyeicosatrienoic acids involved? What is the main finding and its importance? Equal reduction of cortical and total infarct size in rats treated with HBO2 and HET0016 (20-hydroxyeicosatetreanoic acid production inhibitor) and significant mRNA upregulation of epoxyeicosatrienoic acid-producing enzymes (Cyp2J3 and Cyp2C11) in treated groups suggest that HBO2 and HET0016 are highly effective stroke treatments and that cytochrome P450 metabolites are involved in this therapeutic effect. We evaluated the effects of acute and repetitive hyperbaric oxygenation (HBO2 ), 20-hydroxyeicosatetreanoic acid (20-HETE) inhibition by N-hydroxy-N'-(4-butyl-2methylphenyl)-formamidine (HET0016) and their combination on experimental stroke outcomes. Streptozotocin-induced type 1 diabetic Sprague-Dawley female rats (n = 42; n = 7 per group), were subjected to 30 min of transient middle cerebral artery occlusion (t-MCAO)-reperfusion and divided into the following groups: (1) control group, without treatment; and groups exposed to: (2) HBO2 ; (3) multiple HBO2 (HBO2 immediately and second exposure 12 h after t-MCAO); (4) HET0016 pretreatment (1 mg kg-1 , 3 days before t-MCAO) combined with HBO2 after t-MCAO; (5) HET0016 treatment (1 h before, during and for 6 h after t-MCAO); and (6) HET0016 treatment followed by HBO2 after t-MCAO. Messenger RNA expression of CYP2J3, CYP2C11, CYP4A1, endothelial nitric oxide synthase and epoxide hydrolase 2 was determined by real-time qPCR. Cortical infarct size and total infarct size were equally and significantly reduced in HBO2 - and HET0016-treated rats. Combined treatment with HET0016 and HBO2 provided no significant additive effect compared with HET0016 treatment only. Messenger RNA of Cyp2J3 was significantly increased in all study groups, and mRNA of Cyp2C11 was significantly increased in the multiple HBO2 group and the HET0016 treatment followed by HBO2 group, compared with the control group. Expression of endothelial nitric oxide synthase was significantly increased after HBO2 treatments, and expression of epoxide hydrolase 2 was increased in all groups compared with the control group. In diabetic female Sprague-Dawley rats, HBO2 and HET0016 are highly effective stroke treatments, suggesting the involvement of cytochrome P450 metabolites and the NO pathway in this therapeutic effect.
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Affiliation(s)
- Mihael Mišir
- Clinical Hospital Center Osijek, Neurology Clinic, Osijek, Croatia.,University Josip Juraj Strossmayer Osijek, Faculty of Medicine Osijek, Department of Physiology and Immunology, Laboratory for Circulatory Physiology, Osijek, Croatia
| | - Marija Renić
- Croatian Institute for Brain Research, School of Medicine University of Zagreb, Zagreb, Croatia
| | - Sanja Novak
- University Josip Juraj Strossmayer Osijek, Faculty of Medicine Osijek, Department of Physiology and Immunology, Laboratory for Circulatory Physiology, Osijek, Croatia
| | - Martina Mihalj
- University Josip Juraj Strossmayer Osijek, Faculty of Medicine Osijek, Department of Physiology and Immunology, Laboratory for Circulatory Physiology, Osijek, Croatia
| | - Anita Ćosić
- University Josip Juraj Strossmayer Osijek, Faculty of Medicine Osijek, Department of Physiology and Immunology, Laboratory for Circulatory Physiology, Osijek, Croatia
| | - Monika Vesel
- University Josip Juraj Strossmayer Osijek, Faculty of Medicine Osijek, Department of Physiology and Immunology, Laboratory for Circulatory Physiology, Osijek, Croatia
| | - Ines Drenjančević
- University Josip Juraj Strossmayer Osijek, Faculty of Medicine Osijek, Department of Physiology and Immunology, Laboratory for Circulatory Physiology, Osijek, Croatia
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Chen CH, Chen SY, Wang V, Chen CC, Wang KC, Chen CH, Liu YC, Lu KC, Yip PK, Ma WY, Liu CC. Effects of repetitive hyperbaric oxygen treatment in patients with acute cerebral infarction: a pilot study. ScientificWorldJournal 2012; 2012:694703. [PMID: 22919348 PMCID: PMC3415162 DOI: 10.1100/2012/694703] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Accepted: 05/21/2012] [Indexed: 11/17/2022] Open
Abstract
The role of hyperbaric oxygen therapy (HBOT) in the treatment of acute ischemic stroke is controversial. This prospective study assessed the efficacy and safety of HBOT as adjuvant treatment on 46 acute ischemic stroke in patients who did not receive thrombolytic therapy. The HBOT group (n = 16) received conventional medical treatment with 10 sessions of adjunctive HBOT within 3-5 days after stroke onset, while the control group (n = 30) received the same treatment but without HBOT. Early (around two weeks after onset) and late (one month after onset) outcomes (National Institutes of Health Stroke Scale, NIHSS scores) and efficacy (changes of NIHSS scores) of HBOT were evaluated. The baseline clinical characteristics were similar in both groups. Both early and late outcomes of the HBOT group showed significant difference (P ≤ 0.001). In the control group, there was only significant difference in early outcome (P = 0.004). For early efficacy, there was no difference when comparing changes of NIHSS scores between the two groups (P = 0.140) but there was statistically significant difference when comparing changes of NIHSS scores at one month (P ≤ 0.001). The HBOT used in this study may be effective for patients with acute ischemic stroke and is a safe and harmless adjunctive treatment.
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Affiliation(s)
- Cheng-Hsin Chen
- Department of Internal Medicine, Cardinal Tien Hospital, New Taipei City, Taiwan
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Hyperbaric oxygen preconditioning reduces postoperative brain edema and improves neurological outcomes after surgical brain injury. ACTA NEUROCHIRURGICA. SUPPLEMENT 2010; 106:217-20. [PMID: 19812952 DOI: 10.1007/978-3-211-98811-4_40] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The present study was designed to examine if hyperbaric oxygen preconditioning (HBO-PC) is neuroprotective in a mouse model of surgical brain injury (SBI). C57BL mice were administered 100% oxygen for 1 h at 2.5 ATA for 5 consecutive days and subjected to SBI on the following day. The HBO-PC + SBI animals were compared to sham and normoxia + SBI groups for brain water content in different brain regions at 24 and 72 h after surgery. Blood-brain barrier (BBB) permeability was evaluated using Evan's blue dye extravasation at 24 h. Neurological assessment of the animals was done by a blinded observer at 24 and 72 h. The results showed that brain water content was significantly increased in the right (ipsilateral) frontal lobe surrounding the site of resection. This was attenuated by HBO-PC at 24 and 72 h. However, HBO-PC did not have any effect on the increased BBB permeability observed after SBI. Significant neurological deficits were observed after SBI. HBO-PC improved neurological deficits at 72 h on the 21-point sensorimotor scale and at 24 and 72 h on the wire hang and beam balance scoring. In conclusion, HBO-PC attenuates post-operative brain edema and improves neurological outcomes following SBI.
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