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Cakir-Aktas C, Bodur E, Yemisci M, van Leyen K, Karatas H. 12/15-lipoxygenase inhibition attenuates neuroinflammation by suppressing inflammasomes. Front Cell Neurosci 2023; 17:1277268. [PMID: 37822799 PMCID: PMC10562712 DOI: 10.3389/fncel.2023.1277268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Accepted: 09/07/2023] [Indexed: 10/13/2023] Open
Abstract
Introduction Lipoxygenases (LOXs) have essential roles in stroke, atherosclerosis, diabetes, and hypertension. 12/15-LOX inhibition was shown to reduce infarct size and brain edema in the acute phase of experimental stroke. However, the significance of 12/15-LOX on neuroinflammation, which has an essential role in the pathophysiology of stroke, has not been clarified yet. Methods In this study, ischemia/recanalization (I/R) was performed by occluding the proximal middle cerebral artery (pMCAo) in mice. Either the 12/15-LOX inhibitor (ML351, 50 mg/kg) or its solvent (DMSO) was injected i.p. at recanalization after 1 h of occlusion. Mice were sacrificed at 6, 24, and 72-h after ischemia induction. Infarct volumes were calculated on Nissl-stained sections. Neurological deficit scoring was used for functional analysis. Lipid peroxidation was determined by the MDA assay, and the inflammatory cytokines IL-6, TNF-alpha, IL-1beta, IL-10, and TGF-beta were quantified by ELISA. The inflammasome proteins NLRP1 and NLRP3, 12/15-LOX, and caspase-1 were detected with immunofluorescence staining. Results Infarct volumes, neurological deficit scores, and lipid peroxidation were significantly attenuated in ML351-treated groups at 6, 24, and 72-h. ELISA results revealed that the pro-inflammatory cytokines IL-1beta, IL-6, and TNF-alpha were significantly decreased at 6-h and/or 24-h of I/R, while the anti-inflammatory cytokines IL-10 and TNF-alpha were increased at 24-h or 72-h of ML351 treatment. NLRP1 and NLRP3 immunosignaling were enhanced at three time points after I/R, which were significantly diminished by the ML351 application. Interestingly, NLRP3 immunoreactivity was more pronounced than NLRP1. Hence, we proceeded to study the co-localization of NLRP3 immunoreactivity with 12/15-LOX and caspase-1, which indicated that NLRP3 was co-localized with 12/15-LOX and caspase-1 signaling. Additionally, NLRP3 was found in neurons at all time points but in non-neuronal cells 72 h after I/R. Discussion These results suggest that 12/15-LOX inhibition suppresses ischemia-induced inflammation in the acute and subacute phases of stroke via suppressing inflammasome activation. Understanding the mechanisms underlying lipid peroxidation and its associated pathways, like inflammasome activation, may have broader implications for the treatment of stroke and other neurological diseases characterized by neuroinflammation.
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Affiliation(s)
- Canan Cakir-Aktas
- Institute of Neurological Sciences & Psychiatry, Hacettepe University, Ankara, Türkiye
| | - Ebru Bodur
- Department of Medical Biochemistry, Faculty of Medicine, Hacettepe University, Ankara, Türkiye
| | - Muge Yemisci
- Institute of Neurological Sciences & Psychiatry, Hacettepe University, Ankara, Türkiye
- Department of Neurology, Faculty of Medicine, Hacettepe University, Ankara, Türkiye
| | - Klaus van Leyen
- Neuroprotection Research Laboratory, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, United States
| | - Hulya Karatas
- Institute of Neurological Sciences & Psychiatry, Hacettepe University, Ankara, Türkiye
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Mut M, Adiguzel Z, Cakir-Aktas C, Hanalioğlu Ş, Gungor-Topcu G, Kiyga E, Isikay I, Sarac A, Soylemezoglu F, Strobel T, Ampudia-Mesias E, Cameron C, Aslan T, Tekirdas E, Hayran M, Oguz KK, Henzler C, Saydam N, Saydam O. Extracellular-Vesicle-Based Cancer Panels Diagnose Glioblastomas with High Sensitivity and Specificity. Cancers (Basel) 2023; 15:3782. [PMID: 37568598 PMCID: PMC10417317 DOI: 10.3390/cancers15153782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 07/21/2023] [Accepted: 07/24/2023] [Indexed: 08/13/2023] Open
Abstract
Glioblastoma is one of the most devastating neoplasms of the central nervous system. This study focused on the development of serum extracellular vesicle (EV)-based glioblastoma tumor marker panels that can be used in a clinic to diagnose glioblastomas and to monitor tumor burden, progression, and regression in response to treatment. RNA sequencing studies were performed using RNA isolated from serum EVs from both patients (n = 85) and control donors (n = 31). RNA sequencing results for preoperative glioblastoma EVs compared to control EVs revealed 569 differentially expressed genes (DEGs, 2XFC, FDR < 0.05). By using these DEGs, we developed serum-EV-based biomarker panels for the following glioblastomas: wild-type IDH1 (96% sensitivity/80% specificity), MGMT promoter methylation (91% sensitivity/73% specificity), p53 gene mutation (100% sensitivity/89% specificity), and TERT promoter mutation (89% sensitivity/100% specificity). This is the first study showing that serum-EV-based biomarker panels can be used to diagnose glioblastomas with a high sensitivity and specificity.
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Affiliation(s)
- Melike Mut
- Department of Neurosurgery, Faculty of Medicine, Hacettepe University, Ankara 06230, Turkey; (Ş.H.); (I.I.); (T.A.); (E.T.)
- Institute of Neurological Sciences and Psychiatry, Hacettepe University, Ankara 06230, Turkey;
| | - Zelal Adiguzel
- TUBİTAK, GEBI, Gebze, Kocaeli 41470, Turkey; (Z.A.); (G.G.-T.); (E.K.); (A.S.)
- Faculty of Medicine KUTTAM, Koç University, Davutpaşa Street No. 4 Topkapi, Istanbul 34010, Turkey
| | - Canan Cakir-Aktas
- Institute of Neurological Sciences and Psychiatry, Hacettepe University, Ankara 06230, Turkey;
| | - Şahin Hanalioğlu
- Department of Neurosurgery, Faculty of Medicine, Hacettepe University, Ankara 06230, Turkey; (Ş.H.); (I.I.); (T.A.); (E.T.)
| | - Gamze Gungor-Topcu
- TUBİTAK, GEBI, Gebze, Kocaeli 41470, Turkey; (Z.A.); (G.G.-T.); (E.K.); (A.S.)
| | - Ezgi Kiyga
- TUBİTAK, GEBI, Gebze, Kocaeli 41470, Turkey; (Z.A.); (G.G.-T.); (E.K.); (A.S.)
| | - Ilkay Isikay
- Department of Neurosurgery, Faculty of Medicine, Hacettepe University, Ankara 06230, Turkey; (Ş.H.); (I.I.); (T.A.); (E.T.)
| | - Aydan Sarac
- TUBİTAK, GEBI, Gebze, Kocaeli 41470, Turkey; (Z.A.); (G.G.-T.); (E.K.); (A.S.)
| | - Figen Soylemezoglu
- Department of Pathology, Faculty of Medicine, Hacettepe University, Ankara 06230, Turkey;
| | - Thomas Strobel
- Division of Neuropathology and Neurochemistry, Department of Neurology, Medical University of Vienna, 1090 Vienna, Austria;
| | - Elisabet Ampudia-Mesias
- Division of Hematology and Oncology, Department of Pediatrics, Medical School, University of Minnesota, Minneapolis, MN 55455, USA; (E.A.-M.); (C.C.)
| | - Charles Cameron
- Division of Hematology and Oncology, Department of Pediatrics, Medical School, University of Minnesota, Minneapolis, MN 55455, USA; (E.A.-M.); (C.C.)
| | - Tulay Aslan
- Department of Neurosurgery, Faculty of Medicine, Hacettepe University, Ankara 06230, Turkey; (Ş.H.); (I.I.); (T.A.); (E.T.)
| | - Eray Tekirdas
- Department of Neurosurgery, Faculty of Medicine, Hacettepe University, Ankara 06230, Turkey; (Ş.H.); (I.I.); (T.A.); (E.T.)
| | - Mutlu Hayran
- Department of Preventive Oncology, Hacettepe University Cancer Institute, Ankara 06230, Turkey;
| | - Kader Karli Oguz
- Department of Radiology, Faculty of Medicine, Hacettepe University, Ankara 06230, Turkey;
| | - Christine Henzler
- Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455, USA;
| | | | - Okay Saydam
- Division of Hematology and Oncology, Department of Pediatrics, Medical School, University of Minnesota, Minneapolis, MN 55455, USA; (E.A.-M.); (C.C.)
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Cakir-Aktas C, Erdener SE, Teke B, Bozdag Pehlivan S, Zeybek ND, Taskiran-Sag A, Kaya Z, Dalkara T, Mut M. Confocal reflectance microscopy for metal and lipid nanoparticle visualization in the brain. Nanomedicine (Lond) 2022; 17:447-460. [PMID: 35142565 DOI: 10.2217/nnm-2021-0350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Background: A requirement for nanoparticle (NP) research is visualization of particles within cells and tissues. Limitations of electron microscopy and low yields of NP fluorescent tagging warrant the identification of alternative imaging techniques. Method: Confocal reflectance microscopy (CRM) in combination with fluorescence imaging was assessed for visualizing rhodamine B-conjugated silver and fluorescein isothiocyanate-conjugated lipid core-stearylamine NP uptake in vitro and in vivo. Results: CRM successfully identified cellular uptake and blood-brain barrier penetration of NPs owing to their distinguishing refractive indices. NP-dependent reflectance signals in vitro were dose and incubation time dependent. Finally, CRM facilitated the distinction between nonspecific fluorescence signals and NPs. Conclusion: These findings demonstrate the value of CRM for NP visualization in tissues, which can be performed with a standard confocal microscope.
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Affiliation(s)
- Canan Cakir-Aktas
- Hacettepe University, Institute of Neurological Sciences & Psychiatry, Ankara, 06230, Turkey
| | - Sefik Evren Erdener
- Hacettepe University, Institute of Neurological Sciences & Psychiatry, Ankara, 06230, Turkey
| | - Büşra Teke
- Department of Pharmaceutical Technology, Hacettepe University, Faculty of Pharmacy, Ankara, 06230, Turkey
| | - Sibel Bozdag Pehlivan
- Department of Pharmaceutical Technology, Hacettepe University, Faculty of Pharmacy, Ankara, 06230, Turkey
| | - Naciye Dilara Zeybek
- Department of Histology & Embryology, Hacettepe University, Faculty of Medicine, Ankara, 06230, Turkey
| | - Aslihan Taskiran-Sag
- Hacettepe University, Institute of Neurological Sciences & Psychiatry, Ankara, 06230, Turkey
| | - Zeynep Kaya
- Hacettepe University, Institute of Neurological Sciences & Psychiatry, Ankara, 06230, Turkey
| | - Turgay Dalkara
- Hacettepe University, Institute of Neurological Sciences & Psychiatry, Ankara, 06230, Turkey
| | - Melike Mut
- Hacettepe University, Institute of Neurological Sciences & Psychiatry, Ankara, 06230, Turkey.,Department of Neurosurgery, Hacettepe University, Faculty of Medicine, Ankara, 06230, Turkey
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Karakaya D, Cakir-Aktas C, Uzun S, Soylemezoglu F, Mut M. Tailored Therapeutic Doses of Dexmedetomidine in Evolving Neuroinflammation after Traumatic Brain Injury. Neurocrit Care 2021; 36:802-814. [PMID: 34782991 DOI: 10.1007/s12028-021-01381-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 10/13/2021] [Indexed: 12/12/2022]
Abstract
BACKGROUND Understanding the secondary damage mechanisms of traumatic brain injury (TBI) is essential for developing new therapeutic approaches. Neuroinflammation has a pivotal role in secondary brain injury after TBI. Activation of NLRP3 inflammasome complexes results in the secretion of proinflammatory mediators and, in addition, later in the response, microglial activation and migration of the peripheral immune cells into the injured brain are observed. Therefore, these components involved in the inflammatory process are becoming a new treatment target in TBI. Dexmedetomidine (Dex) is an effective drug, widely used over the past few years in neurocritical care units and during surgical operations for sedation and analgesia, and has anti-inflammatory effects, which are shown in in vivo studies. The aim of this original research is to discuss the anti-inflammatory effects of different Dex doses over time in TBI. METHODS Brain injury was performed by using a weight-drop model. Half an hour after the trauma, intraperitoneal saline was injected into the control groups and 40 and 200 μg/kg of Dex were given to the drug groups. Neurological evaluations were performed with the modified Neurological Severity Score before being killed. Then, the mice were killed on the first or the third day after TBI and histopathologic (hematoxylin-eosin) and immunofluorescent (Iba1, NLRP3, interleukin-1β, and CD3) findings of the brain tissues were examined. Nonparametric data were analyzed by using the Kruskal-Wallis test for multiple comparisons, and the Mann-Whitney U-test was done for comparing two groups. The results are presented as mean ± standard error of mean. RESULTS The results showed that low doses of Dex suppress NLRP3 and interleukin-1β in both terms. Additionally, high doses of Dex cause a remarkable decrease in the migration and motility of microglial cells and T cells in the late phase following TBI. Interestingly, the immune cells were influenced by only high-dose Dex in the late phase of TBI and it also improves neurologic outcome in the same period. CONCLUSIONS In the mice head trauma model, different doses of Dex attenuate neuroinflammation by suppressing distinct components of the neuroinflammatory process in a different timecourse that contributes to neurologic recovery. These results suggest that Dex may be an appropriate choice for sedation and analgesia in patients with TBI.
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Affiliation(s)
- Dicle Karakaya
- Faculty of Medicine, Department of Neurosurgery, Hacettepe University, Ankara, Turkey
| | - Canan Cakir-Aktas
- Institute of Neurological Sciences and Psychiatry, Hacettepe University, Ankara, Turkey
| | - Sennur Uzun
- Faculty of Medicine, Department of Anesthesiology and Reanimation, Hacettepe University, Ankara, Turkey
| | - Figen Soylemezoglu
- Faculty of Medicine, Department of Pathology, Hacettepe University, Ankara, Turkey
| | - Melike Mut
- Faculty of Medicine, Department of Neurosurgery, Hacettepe University, Ankara, Turkey.
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Marjani S, Zirh S, Sever-Bahcekapili M, Cakir-Aktas C, Muftuoglu SF, Mut M. Doxycycline alleviates acute traumatic brain injury by suppressing neuroinflammation and apoptosis in a mouse model. J Neuroimmunol 2021; 359:577672. [PMID: 34364104 DOI: 10.1016/j.jneuroim.2021.577672] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 07/11/2021] [Accepted: 07/21/2021] [Indexed: 01/05/2023]
Abstract
Traumatic brain injury (TBI) is one of the significant causes of death among young people worldwide. Doxycycline (DOX), an antibiotic with anti-inflammatory effects, has not been used as a therapeutic agent to modify the inflammatory response after the traumatic brain injury. In this study, intraperitoneal administration of DOX reduced significantly the acute inflammatory markers like IL-6 and CD3, microglial migration to the damaged area marked with Iba-1, and neuronal apoptosis assessed with TUNEL assay at 72 h after the trauma. The low dose, 10 mg/kg of DOX had a dominant anti-inflammatory effect; while the high dose, 100 mg/kg of DOX, was more effective in decreasing neuronal apoptosis. In early hours after the head trauma, use of a low dose (10 mg/kg) of DOX for decreasing the acute form of inflammation followed by a high dose (100 mg/kg) for the anti-apoptotic effects particularly in severe head traumas, would be a promising approach to alleviate the brain injury.
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Affiliation(s)
- Saeid Marjani
- Department of Neurosurgery, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - Selim Zirh
- Department of Histology and Embryology, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | | | - Canan Cakir-Aktas
- Institute of Neurological Sciences and Psychiatry, Hacettepe University, Ankara, Turkey
| | - Sevda Fatma Muftuoglu
- Department of Histology and Embryology, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - Melike Mut
- Department of Neurosurgery, Hacettepe University Faculty of Medicine, Ankara, Turkey; Institute of Neurological Sciences and Psychiatry, Hacettepe University, Ankara, Turkey.
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Karatas H, Cakir-Aktas C. 12/15 Lipoxygenase as a Therapeutic Target in Brain Disorders. ACTA ACUST UNITED AC 2019; 56:288-291. [PMID: 31903039 DOI: 10.29399/npa.23646] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 04/11/2019] [Indexed: 12/31/2022]
Abstract
Lipoxygenases are a family of lipid-oxidizing enzymes, which generate eicosanoids and related compounds from arachidonic acid and other polyunsaturated fatty acids. These metabolites play important roles in physiology and pathogenesis of host defense mechanisms, cardiovascular diseases, cancer, inflammatory, allergic and neurodegenerative diseases. The 12/15-lipoxygenase (LOX) is special in that it can directly oxidize lipid membranes containing polyunsaturated fatty acids, without the preceding action of a phospholipase, leading to the direct attack on membranous organelles, such as mitochondria. The cytotoxic activity of human 12/15-LOX is up-regulated in neurons and endothelial cells especially after a stroke and thought to contribute to both neuronal cell death and blood-brain barrier leakage. The discovery of inhibitors that selectively target recombinant 12/15-LOX in vitro, as well as possessing activity against the murine orthologous ex vivo, could potentially support a novel therapeutic strategy for the treatment of stroke and other brain disorders related to 12/15-LOX. Here we reviewed 12/15-LOX chemistry shortly, and the diseases in which 12/15-LOX has a role in their pathophysiology and recent advances of 12/15-LOX inhibitors as a treatment option for neurological diseases.
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Affiliation(s)
- Hulya Karatas
- Hacettepe University, Institute of Neurological Sciences and Psychiatry, Ankara, Turkey
| | - Canan Cakir-Aktas
- Hacettepe University, Institute of Neurological Sciences and Psychiatry, Ankara, Turkey
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