Purpose: To evaluate chemokine expression at various retinal sites after ischemia-reperfusion injury, using reverse transcription-polymerase chain reaction (RT-PCR) analysis of selected tissue obtained by laser capture microdissection.
Methods: Retinal ischemia was produced in Lewis rats by increasing intraocular pressure for 75 minutes. At 3, 6, 12, and 24 hours after reperfusion, RT-PCR was used to measure the levels of monocyte chemoattractant protein (MCP)-1, macrophage inflammatory protein (MIP)-1alpha, MIP-1beta, interleukin (IL)-8, and interferon-gamma-inducible 10-kDa protein (IP-10) mRNA expression in the ganglion cell layer (GCL), inner nuclear layer (INL), outer nuclear layer (ONL), and retinal vessels, after laser capture microdissection of these retinal layers. These chemokines were further localized by immunohistochemical methods, using antibodies specific to MCP-1 and MIP-1alpha. Leukocyte infiltration into the retina was detected with immunostaining for leukocyte common antigen.
Results: Ischemia-reperfusion induced expression of MCP-1, MIP-1alpha, and MIP-1beta mRNA in the retinal vessels 3 hours after reperfusion. Six hours after reperfusion, expression of these chemokines and IL-8 mRNA was seen in the GCL and INL. Twelve hours after reperfusion, IP-10 mRNA expression was seen in the GCL and INL. Immunoreactive MCP-1 and MIP-1alpha were detected in the GCL, INL, and the retinal vessels 24 hours after reperfusion. No chemokine mRNA expression or immunoreactivity was detected in the ONL at any time. Leukocyte infiltration was noted at 12 hours, increasing markedly 24 hours after reperfusion.
Conclusions: Ischemia-reperfusion retinal injury results in generation of highly chemotactic agents, initially in the retinal vasculature, then in the other inner retinal layers. Such differential chemokine expression may play a role in leukocyte recruitment and selective leukocyte infiltration in the inner retina, leading to retinal damage primarily localized to the ganglion cells and other inner neuronal structures.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1167/iovs.02-1308 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effects of Electroacupuncture Per-Conditioning at Huantiao on Motor Function Recovery in Acute Cerebral Ischemia Mice.
Physiol Behav
January 2025
Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China; Department of Rehabilitation Medicine, Huashan Hospital, Fudan University, Shanghai, 200040, China. Electronic address:
Background: Continuous electroacupuncture pre-conditioning (EPRC) and post-conditioning (EPOC) effectively improve motor dysfunction after acute cerebral ischemia, but they require multiple treatments. Recently, electroacupuncture per-conditioning (EPEC) has demonstrated neuroprotective effects, indicating that this single-session intervention has short-term efficacy.
Objective: To evaluate the effect of EPEC at Huantiao (GB30) on motor recovery in acute cerebral ischemia mice.
Nelonemdaz and Patients With Acute Ischemic Stroke and Mechanical Reperfusion: The RODIN Randomized Clinical Trial.
JAMA Netw Open
January 2025
Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
Importance: Nelonemdaz selectively antagonizes the 2B subunit of the N-methyl-d-aspartate glutamate receptor and scavenges free radical species.
Objective: To evaluate whether nelonemdaz enhances the clinical outcomes of patients with acute ischemic stroke undergoing emergent reperfusion therapy.
Design, Setting, And Participants: This multicenter double-blind placebo-controlled randomized phase 3 trial (December 25, 2021, to June 30, 2023, in South Korea) recruited patients with acute ischemic stroke who met the following criteria: National Institutes of Health Stroke Scale score greater than or equal to 8, Alberta Stroke Program Early Computed Tomography score greater than or equal to 4, and endovascular thrombectomy within 12 hours after stroke onset.
Daytime DNase-I Administration Protects Mice From Ischemic Stroke Without Inducing Bleeding or tPA-Induced Hemorrhagic Transformation, Even With Aspirin Pretreatment.
Stroke
February 2025
Neurovascular Research Unit, Pharmacology Department, Complutense Medical School, Instituto Investigación Hospital 12 Octubre, Madrid, Spain (G.D., B.D., A.M., J.M.P., I.L.).
Background: Acute ischemic stroke treatment typically involves tissue-type plasminogen activator (tPA) or tenecteplase, but about 50% of patients do not achieve successful reperfusion. The causes of tPA resistance, influenced by thrombus composition and timing, are not fully clear. Neutrophil extracellular traps (NETs), associated with poor outcomes and reperfusion resistance, contribute to thrombosis.
View Article and Find Full Text PDFPersistent Penumbral Profiles Indicate a Potentially Good Outcome in Acute Stroke Patients Without Major Reperfusion.
Int J Stroke
January 2025
Department of Neurology, National Center for Neurological Disorders, National Clinical Research Centre for Aging and Medicine, Huashan Hospital, State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, China.
Background: It is acknowledged that penumbra can exist beyond 24 hours after stroke onset.
Aims: The aim of this study was to explore the association between penumbral persistence at 24-72 hours and clinical outcomes in patients who did not achieve major reperfusion.
Methods: Eligible patients participating in the International Stroke Perfusion Imaging Registry with repeated 24-72 hours perfusion imaging were retrospectively included in this study.
Analysis of the protective effect of hydrogen sulfide over time in ischemic rat skin flaps.
Ann Chir Plast Esthet
January 2025
Department of Plastic, Reconstructive, and Aesthetic Surgery, Faculty of Medicine, Çukurova University, Adana, Turkey.
Background: Hydrogen sulfide (HS) is a widely studied gasotransmitter, and its protective effect against ischemia-reperfusion damage has been explored in several studies. Therefore, a requirement exists for a comprehensive study about HS effects on ischemia-reperfusion damage in flap surgery. The aim of this study is to examine the effect of hydrogen sulfide by creating ischemia-reperfusion injury in the vascular-stemmed island flap prepared from the rat groin area.
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!