Purpose: To investigate the protective roles played by heme oxygenase (HO)-1 and -2 in the rat retina after ischemia-reperfusion injury.
Methods: Retinal ischemia was induced in rats by increasing the intraocular pressure to 110 mmHg for 60 minutes. The expression of HO-1 and -2 in the retina was determined by Western blot, real-time polymerase chain reaction (PCR), and immunohistochemistry. To inhibit the upregulation of HO-1, short interfering (si)RNA of HO-1 was injected intravitreally before ischemia and that of green fluorescent protein (GFP) was used as the control. Muller cell damage was assessed by counting the number of S-100-positive cells. The number of macrophages invading the retina was determined by counting the number of ED-1-positive cells.
Results: The expression of HO-1 mRNA and protein was upregulated at 6 hours after reperfusion and peaked at 12 to 24 hours, whereas that of HO-2 was not altered. HO-1 immunoreactivities were detected in Muller cells at 24 hours after reperfusion, and HO-2 immunoreactivities were detected in retinal cells. The HO-1 expression in the retina treated with siRNA of HO-1 was reduced at 12 and 24 hours after reperfusion compared with that injected with siRNA of GFP. The number of S-100-positive cells at 24 hours after reperfusion decreased significantly in retinas treated with HO-1 siRNA (P <0.01). The number of macrophages that had infiltrated the retina was increased in retinas pretreated with the siRNA of HO-1 compared with those treated with siRNA of GFP. On day 14 after reperfusion, HO-1 siRNA-treated retinas showed severe retinal injury and destruction of the retinal architecture.
Conclusions: HO-1 promotes the survival of Muller cells after ischemia-reperfusion injury. Because inhibition of the upregulation of HO-1 resulted in an infiltration of inflammatory cells and destruction of the retina, the authors conclude that HO-1 induced in Muller cells plays a protective role in retinal ischemia-reperfusion.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1167/iovs.04-0450 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Protective Effects of Alpha-Pinene Pre-Treatment in Renal Ischemia-Reperfusion Injury in Male Rats.
Iran J Kidney Dis
December 2024
Pathology Department, Afzalipour Kerman University of Medical Sciences, Kerman, Iran.
Introduction: Ischemia followed by reperfusion in organ transplantations can lead to ischemia-reperfusion (I-R) injury, which is associated with oxidative stress and inflammatory responses. Alpha-pinene is an organic terpene with well-known antioxidant, anti-inflammatory, and anti-apoptotic properties. This study examines the preventive effects of alpha-pinene against renal I-R-induced kidney dysfunction, oxidative and inflammatory status, apoptosis, and histopathology changes.
View Article and Find Full Text PDFOutcomes and Complications Associated with Mechanical Thrombectomy in the Treatment of Acute Ischemic Stroke.
Cardiol Cardiovasc Med
December 2024
Department of Translational Research, College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona CA 91766, USA.
Universally, stroke presents as neurological deficits due to the obstruction of blood supply to specific regions of the brain. Among the three main categories of stroke, acute ischemic stroke is the leading cause of death and disability worldwide. As of today, there are two effective treatment methods: thrombolysis and endovascular therapy.
View Article and Find Full Text PDFTransforming the logistics of liver transplantation with normothermic machine perfusion: Clinical impact versus cost.
Liver Transpl
December 2024
Duke Transplant Center, Duke University Medical Center, Durham, NC, USA.
Normothermic machine perfusion (NMP) facilitates utilization of marginal liver allografts. It remains unknown whether clinical benefits offset additional costs in the real-world setting. We performed a comparison of outcomes and hospitalization costs for donor livers preserved by NMP versus static cold storage (SCS) at a high-volume center.
View Article and Find Full Text PDFPoststroke hyperglycemia dysregulates cap-dependent translation in neural cells.
Life Sci
December 2024
Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Neuroscience, School of Medicine, and Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV, United States; Department of Pharmaceutical Sciences, School of Pharmacy, Morgantown, WV, United States; Department of Anesthesiology and Critical Care Medicine, School of Medicine, Johns Hopkins University, Baltimore, MD, United States. Electronic address:
Aims: Post stroke hyperglycemia has been shown to deter functional recovery. Earlier findings have indicated the cap-dependent translation regulator 4E-BP1 is detrimentally upregulated in hyperglycemic conditions. The present study aims to test the hypothesis that hyperglycemic ischemic reperfusion injury (I/R) affects normal protein translation poststroke.
View Article and Find Full Text PDFTreatment of sudden sensorineural hearing loss with tinnitus with Fu subcutaneous needling: A case report.
Medicine (Baltimore)
December 2024
The Community Health Service Center of Jingan in Qixia District, Nanjing, China.
Rationale: Fu's subcutaneous needling (FSN) is a special acupuncture method that uses FSN to sweep the subcutaneous tissue around or adjacent to the limbs to disperse the pain. Sudden sensorineural hearing loss (SSHL) is a kind of otological emergency with sudden onset within 72 hours, with unilateral hearing loss, and hearing loss of ≥20 dB in 2 connected frequencies, and most of the patients have no obvious triggers. Most patients with SSHL are accompanied by tinnitus, vertigo, and nausea and vomiting.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!