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Chen W, Kim SY, Lee A, Kim YJ, Chang C, Ton-That H, Kim R, Kim S, Park NH. hTERT Peptide Fragment GV1001 Prevents the Development of Porphyromonas gingivalis-Induced Periodontal Disease and Systemic Disorders in ApoE-Deficient Mice. Int J Mol Sci 2024; 25:6126. [PMID: 38892314 PMCID: PMC11172542 DOI: 10.3390/ijms25116126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 05/23/2024] [Accepted: 05/28/2024] [Indexed: 06/21/2024] Open
Abstract
GV1001, an anticancer vaccine, exhibits other biological functions, including anti-inflammatory and antioxidant activity. It also suppresses the development of ligature-induced periodontitis in mice. Porphyromonas gingivalis (Pg), a major human oral bacterium implicated in the development of periodontitis, is associated with various systemic disorders, such as atherosclerosis and Alzheimer's disease (AD). This study aimed to explore the protective effects of GV1001 against Pg-induced periodontal disease, atherosclerosis, and AD-like conditions in Apolipoprotein (ApoE)-deficient mice. GV1001 effectively mitigated the development of Pg-induced periodontal disease, atherosclerosis, and AD-like conditions by counteracting Pg-induced local and systemic inflammation, partly by inhibiting the accumulation of Pg DNA aggregates, Pg lipopolysaccharides (LPS), and gingipains in the gingival tissue, arterial wall, and brain. GV1001 attenuated the development of atherosclerosis by inhibiting vascular inflammation, lipid deposition in the arterial wall, endothelial to mesenchymal cell transition (EndMT), the expression of Cluster of Differentiation 47 (CD47) from arterial smooth muscle cells, and the formation of foam cells in mice with Pg-induced periodontal disease. GV1001 also suppressed the accumulation of AD biomarkers in the brains of mice with periodontal disease. Overall, these findings suggest that GV1001 holds promise as a preventive agent in the development of atherosclerosis and AD-like conditions associated with periodontal disease.
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Affiliation(s)
- Wei Chen
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave., Los Angeles, CA 90095, USA; (W.C.); (S.Y.K.); (A.L.); (Y.-J.K.); (R.K.)
| | - Sharon Y. Kim
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave., Los Angeles, CA 90095, USA; (W.C.); (S.Y.K.); (A.L.); (Y.-J.K.); (R.K.)
| | - Alicia Lee
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave., Los Angeles, CA 90095, USA; (W.C.); (S.Y.K.); (A.L.); (Y.-J.K.); (R.K.)
| | - Yun-Jeong Kim
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave., Los Angeles, CA 90095, USA; (W.C.); (S.Y.K.); (A.L.); (Y.-J.K.); (R.K.)
| | - Chungyu Chang
- Section of Oral Biology, UCLA School of Dentistry, 714 Tiverton Avenue, Los Angeles, CA 90095, USA; (C.C.); (H.T.-T.)
| | - Hung Ton-That
- Section of Oral Biology, UCLA School of Dentistry, 714 Tiverton Avenue, Los Angeles, CA 90095, USA; (C.C.); (H.T.-T.)
| | - Reuben Kim
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave., Los Angeles, CA 90095, USA; (W.C.); (S.Y.K.); (A.L.); (Y.-J.K.); (R.K.)
- UCLA Jonsson Comprehensive Cancer Center, 10833 Le Conte Ave., Los Angeles, CA 90095, USA
| | - Sangjae Kim
- Teloid Inc., 920 Westholme Avenue, Los Angeles, CA 90024, USA;
| | - No-Hee Park
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave., Los Angeles, CA 90095, USA; (W.C.); (S.Y.K.); (A.L.); (Y.-J.K.); (R.K.)
- Teloid Inc., 920 Westholme Avenue, Los Angeles, CA 90024, USA;
- Department of Medicine, David Geffen School of Medicine at UCLA, 10833 Le Conte Ave., Los Angeles, CA 90095, USA
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Wang X, Deng H, Lin J, Zhang K, Ni J, Li L, Fan G. Distinct roles of telomerase activity in age-related chronic diseases: An update literature review. Biomed Pharmacother 2023; 167:115553. [PMID: 37738798 DOI: 10.1016/j.biopha.2023.115553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 09/15/2023] [Accepted: 09/18/2023] [Indexed: 09/24/2023] Open
Abstract
Although telomerase has low activity in somatic quiescent cells, it plays an significant roles in regenerative cells such as endothelial cells, hepatocytes, epithelial cells, and hemocytes. Telomerase activity and telomere length are critical factors in age-related chronic diseases as they are closely related to cell senescence. However, whether telomerase activity plays a key role in disease progression or whether the role of telomerase is unified among different diseases are unresolved. Considering that aging is the most important risk factor for neurodegenerative and metabolic diseases, this article will analyze the evidence, mechanism, and therapeutic potential of telomerase activity in several chronic disease, including type 2 diabetes, neurodegenerative diseases, atherosclerosis, heart failure and non-alcoholic fatty liver disease, in order to provide clues for the use of telomerase activity to target the treatment of age-related chronic diseases.
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Affiliation(s)
- Xiaodan Wang
- Medical Experiment Center, Tianjin Key Laboratory of Translational Research of TCM Prescription and Syndrome, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, 300381 Tianjin, China
| | - Hao Deng
- Medical Experiment Center, Tianjin Key Laboratory of Translational Research of TCM Prescription and Syndrome, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, 300381 Tianjin, China
| | - Jingyi Lin
- Medical Experiment Center, Tianjin Key Laboratory of Translational Research of TCM Prescription and Syndrome, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, 300381 Tianjin, China
| | - Kai Zhang
- Medical Experiment Center, Tianjin Key Laboratory of Translational Research of TCM Prescription and Syndrome, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, 300381 Tianjin, China
| | - Jingyu Ni
- Medical Experiment Center, Tianjin Key Laboratory of Translational Research of TCM Prescription and Syndrome, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, 300381 Tianjin, China
| | - Lan Li
- State Key Laboratory of Modern Chinese Medicine, Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae for the Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Guanwei Fan
- Medical Experiment Center, Tianjin Key Laboratory of Translational Research of TCM Prescription and Syndrome, National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, 300381 Tianjin, China.
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Kim SY, Kim YJ, Kim S, Momeni M, Lee A, Treanor A, Kim S, Kim RH, Park NH. GV1001 Inhibits the Severity of the Ligature-Induced Periodontitis and the Vascular Lipid Deposition Associated with the Periodontitis in Mice. Int J Mol Sci 2023; 24:12566. [PMID: 37628753 PMCID: PMC10454325 DOI: 10.3390/ijms241612566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 08/02/2023] [Accepted: 08/05/2023] [Indexed: 08/27/2023] Open
Abstract
GV1001, a 16 amino acid peptide derived from the catalytic segment of human telomerase reverse transcriptase, was developed as an anti-cancer vaccine. Subsequently, it was found to exhibit anti-inflammatory and anti-Alzheimer's disease properties. Periodontitis is a risk factor for a variety of systemic diseases, including atherosclerosis, a process in which chronic systemic and vascular inflammation results in the formation of plaques containing lipids, macrophages, foam cells, and tissue debris on the vascular intima. Thus, we investigated the effect of GV1001 on the severity of ligature-induced periodontitis, vascular inflammation, and arterial lipid deposition in mice. GV1001 notably reduced the severity of ligature-induced periodontitis by inhibiting gingival and systemic inflammation, alveolar bone loss, and vascular inflammation in wild-type mice. It also significantly lowered the amount of lipid deposition in the arterial wall in ApoE-deficient mice receiving ligature placement without changing the serum lipid profile. In vitro, we found that GV1001 inhibited the Receptor Activator of NF-κB ligand (RANKL)-induced osteoclast formation and tumor necrosis factor-α (TNF-α)-induced phenotypic changes in endothelial cells. In conclusion, our study suggests that GV1001 prevents the exacerbation of periodontitis and atherosclerosis associated with periodontitis partly by inhibiting local, systemic, and vascular inflammation and phenotypic changes of vascular endothelial cells.
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Affiliation(s)
- Sharon Y. Kim
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave, Los Angeles, CA 90095, USA
| | - Yun-Jeong Kim
- Department of Periodontology, Seoul National University Gwanak Dental Hospital, School of Dentistry and Dental Research Institute, Seoul National University, Seoul 08826, Republic of Korea
| | - Suyang Kim
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave, Los Angeles, CA 90095, USA
| | - Mersedeh Momeni
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave, Los Angeles, CA 90095, USA
| | - Alicia Lee
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave, Los Angeles, CA 90095, USA
| | - Alexandra Treanor
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave, Los Angeles, CA 90095, USA
| | - Sangjae Kim
- Teloid Inc., 920 Westholme Avenue, Los Angeles, CA 90024, USA
| | - Reuben H. Kim
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave, Los Angeles, CA 90095, USA
- UCLA Jonsson Comprehensive Cancer Center, 10833 Le Conte Ave, Los Angeles, CA 90095, USA
| | - No-Hee Park
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 714 Tiverton Ave, Los Angeles, CA 90095, USA
- UCLA Jonsson Comprehensive Cancer Center, 10833 Le Conte Ave, Los Angeles, CA 90095, USA
- Department of Medicine, David Geffen School of Medicine at UCLA, 10833 Le Conte Ave, Los Angeles, CA 90095, USA
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Kwon HS, Kim YE, Park HH, Son JW, Choi H, Lee YJ, Kim HY, Lee KY, Koh SH. Neuroprotective Effects of GV1001 in Animal Stroke Model and Neural Cells Subject to Oxygen-Glucose Deprivation/Reperfusion Injury. J Stroke 2021; 23:420-436. [PMID: 34649386 PMCID: PMC8521247 DOI: 10.5853/jos.2021.00626] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 06/16/2021] [Indexed: 12/04/2022] Open
Abstract
Background and Purpose Previous studies have revealed the diverse neuroprotective effects of GV1001. In this study, we investigated the effects of GV1001 on focal cerebral ischemia-reperfusion injury (IRI) in rats and oxygen-glucose deprivation/reoxygenation (OGD/R)-induced injury in neural stem cells (NSCs) and cortical neurons.
Methods Focal cerebral IRI was induced by transient middle cerebral artery occlusion (MCAO). Brain diffusion-weighted imaging (DWI) was performed 2 hours after occlusion, and a total of 37 rats were treated by reperfusion with GV1001 or saline 2 hours after occlusion. Fluid-attenuated inversion recovery (FLAIR) magnetic resonance imaging, immunohistochemistry, and neurobehavioral function analyses were performed. Additionally, OGD/R-injured NSCs and cortical neurons were treated with different GV1001 concentrations. Cell viability, proliferation, migration, and oxidative stress were determined by diverse molecular analyses.
Results In the stroke model, GV1001 protected neural cells against IRI. The most effective dose of GV1001 was 60 μM/kg. The infarct volume on FLAIR 48 hours after MCAO compared to lesion volume on DWI showed a significantly smaller ratio in the GV1001-treated group. GV1001-treated rats exhibited better behavioral functions than the saline-treated rats. Treatment with GV1001 increased the viability, proliferation, and migration of the OGD/R-injured NSCs. Free radicals were significantly restored by treatment with GV1001. These neuroprotective effects of GV1001 have also been demonstrated in OGD/R-injured cortical neurons. Conclusions The results suggest that GV1001 has neuroprotective effects against IRI in NSCs, cortical neurons, and the rat brain. These effects are mediated through the induction of cellular proliferation, mitochondrial stabilization, and anti-apoptotic, anti-aging, and antioxidant effects.
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Affiliation(s)
- Hyuk Sung Kwon
- Department of Neurology, Hanyang University Guri Hospital, Hangyang University College of Medicine, Guri, Korea
| | - Ye Eun Kim
- Department of Neurology, Hanyang University Guri Hospital, Hangyang University College of Medicine, Guri, Korea
| | - Hyun-Hee Park
- Department of Neurology, Hanyang University Guri Hospital, Hangyang University College of Medicine, Guri, Korea
| | - Jeong-Woo Son
- Department of Neurology, Hanyang University Guri Hospital, Hangyang University College of Medicine, Guri, Korea
| | - Hojin Choi
- Department of Neurology, Hanyang University Guri Hospital, Hangyang University College of Medicine, Guri, Korea
| | - Young Joo Lee
- Department of Neurology, Hanyang University Guri Hospital, Hangyang University College of Medicine, Guri, Korea
| | - Hyun Young Kim
- Department of Neurology, Hanyang University Seoul Hospital, Hanyang University College of Medicine, Seoul, Korea
| | - Kyu-Yong Lee
- Department of Neurology, Hanyang University Guri Hospital, Hangyang University College of Medicine, Guri, Korea
| | - Seong-Ho Koh
- Department of Neurology, Hanyang University Guri Hospital, Hangyang University College of Medicine, Guri, Korea.,Department of Translational Medicine, Hanyang University Graduate School of Biomedical Science & Engineering, Seoul, Korea
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Potential roles of telomeres and telomerase in neurodegenerative diseases. Int J Biol Macromol 2020; 163:1060-1078. [DOI: 10.1016/j.ijbiomac.2020.07.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 06/23/2020] [Accepted: 07/06/2020] [Indexed: 12/16/2022]
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Lee EK, Kim YJ, Shon WJ, Yu HG. A telomerase-derived peptide vaccine inhibits laser-induced choroidal neovascularization in a rat model. Transl Res 2020; 216:30-42. [PMID: 31655029 DOI: 10.1016/j.trsl.2019.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 09/05/2019] [Accepted: 10/02/2019] [Indexed: 10/25/2022]
Abstract
GV1001, a novel peptide derived from human telomerase reverse transcriptase, reportedly has anticancer and anti-inflammatory effects. Choroidal neovascularization (CNV) is a complex pathogenic process that involves angiogenesis, inflammation, cellular immunity, and other factors. This study was aimed at investigating the effect of GV1001 on laser-induced CNV in a rat model. Brown Norway rats were subcutaneously administered GV1001 (0.1 nM, 1 nM, and 10 nM) daily, beginning 3 days prior, and ending 14 days after laser photocoagulation. Optical coherence tomography, fluorescein angiography, choroidal flat mount, and histologic analysis were performed to analyze CNV. The protein level of IκB-α and nuclear translocation of nuclear factor κB (NF-κB) was analyzed via immunohistochemistry of p65. Multiplex immunoassay was performed to evaluate the interleukin (IL)-1β, IL-6, vascular endothelial growth factor (VEGF), monocyte chemotactic protein-1, and tumor necrosis factor-α levels. The GV1001-treated group had significantly lower CNV thickness, smaller CNV area, and lower proportion of CNV lesions with clinically significant fluorescein leakage than vehicle-treated group. GV1001 treatment inhibited IκB-α degradation and NF-κB p65 nuclear translocation. At 1 nM concentration, GV1001 had highest inhibitory effect on CNV and NF-κB signaling activation; moreover, it suppressed the levels of IL-1β, IL-6, and VEGF significantly. The present study demonstrates that GV1001 treatment led to significant suppression of laser-induced CNV, alongside inhibition of inflammatory processes including NF-κB activation and subsequent upregulation of proinflammatory cytokines. Therefore, this provides molecular evidence of potential validity of GV1001 treatment as a therapeutic strategy for neovascular age-related macular degeneration.
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Affiliation(s)
- Eun Kyoung Lee
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Young Joo Kim
- Department of Ophthalmology, Seoul National University Hospital Biomedical Research Institute, Seoul, Republic of Korea
| | - Won-Jun Shon
- Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Hyeong Gon Yu
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea.
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Lee SY, Han JJ, Lee SY, Jung G, Min HJ, Song JJ, Koo JW. Outcomes of Peptide Vaccine GV1001 Treatment in a Murine Model of Acute Noise-Induced Hearing Loss. Antioxidants (Basel) 2020; 9:antiox9020112. [PMID: 32012778 PMCID: PMC7070461 DOI: 10.3390/antiox9020112] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 01/19/2020] [Accepted: 01/25/2020] [Indexed: 11/16/2022] Open
Abstract
Noise-induced hearing loss (NIHL) is primarily caused by damage to cochlear hair cells, associated with synaptopathy. The novel cell-penetrating peptide GV1001, an antitumor agent, also has antioxidant and anti-inflammatory effects, and is otoprotective in a murine model of kanamycin-induced ototoxicity. Here, we explored whether GV1001 attenuated NIHL, and the underlying mechanism at play. We established an NIHL model by exposing 4- to 6-week-old C57/BL6 mice to white noise at 120 dB SPL for 2 h, resulting in a significant permanent threshold shift (PTS). We then subcutaneously injected saline (control), GV1001, or dexamethasone immediately after cessation of PTS-noise exposure and evaluated the threshold shifts, structural damages to outer hair cells (OHCs), and ribbon synapses. We also verified whether GV1001 attenuates oxidative stress at the level of lipid peroxidation or protein nitration in OHCs 1 h after exposure to white noise at 120 dB SPL. GV1001-treated mice exhibited significantly less hearing threshold shifts over 2 weeks and preserved OHCs and ribbon synapses compared with controls. Similarly, dexamethasone-treated mice showed comparable protection against NIHL. Importantly, GV1001 markedly attenuated oxidative stress in OHCs. Our findings suggest that GV1001 may protect against NIHL by lowering oxidative stress and may serve as preventive or adjuvant treatment.
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Affiliation(s)
- Sang-Yeon Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam 463-707, Korea; (S.-Y.L.); (G.J.); (H.J.M.); (J.-J.S.)
| | - Jae Joon Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Soonchunhyang University College of Medicine, Seoul Hospital, Seoul 04401, Korea;
| | - Sang-Youp Lee
- Department of Otolaryngology, Wonkwang University Hospital, Wonkwang University School of Medicine, Iksan 15865, Korea;
| | - Gaon Jung
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam 463-707, Korea; (S.-Y.L.); (G.J.); (H.J.M.); (J.-J.S.)
| | - Hyun Jin Min
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam 463-707, Korea; (S.-Y.L.); (G.J.); (H.J.M.); (J.-J.S.)
| | - Jae-Jin Song
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam 463-707, Korea; (S.-Y.L.); (G.J.); (H.J.M.); (J.-J.S.)
| | - Ja-Won Koo
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam 463-707, Korea; (S.-Y.L.); (G.J.); (H.J.M.); (J.-J.S.)
- Correspondence:
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Yu H, Kalogeris T, Korthuis RJ. Reactive species-induced microvascular dysfunction in ischemia/reperfusion. Free Radic Biol Med 2019; 135:182-197. [PMID: 30849489 PMCID: PMC6503659 DOI: 10.1016/j.freeradbiomed.2019.02.031] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 02/26/2019] [Accepted: 02/26/2019] [Indexed: 12/13/2022]
Abstract
Vascular endothelial cells line the inner surface of the entire cardiovascular system as a single layer and are involved in an impressive array of functions, ranging from the regulation of vascular tone in resistance arteries and arterioles, modulation of microvascular barrier function in capillaries and postcapillary venules, and control of proinflammatory and prothrombotic processes, which occur in all segments of the vascular tree but can be especially prominent in postcapillary venules. When tissues are subjected to ischemia/reperfusion (I/R), the endothelium of resistance arteries and arterioles, capillaries, and postcapillary venules become dysfunctional, resulting in impaired endothelium-dependent vasodilator and enhanced endothelium-dependent vasoconstrictor responses along with increased vulnerability to thrombus formation, enhanced fluid filtration and protein extravasation, and increased blood-to-interstitium trafficking of leukocytes in these functionally distinct segments of the microcirculation. The number of capillaries open to flow upon reperfusion also declines as a result of I/R, which impairs nutritive perfusion. All of these pathologic microvascular events involve the formation of reactive species (RS) derived from molecular oxygen and/or nitric oxide. In addition to these effects, I/R-induced RS activate NLRP3 inflammasomes, alter connexin/pannexin signaling, provoke mitochondrial fission, and cause release of microvesicles in endothelial cells, resulting in deranged function in arterioles, capillaries, and venules. It is now apparent that this microvascular dysfunction is an important determinant of the severity of injury sustained by parenchymal cells in ischemic tissues, as well as being predictive of clinical outcome after reperfusion therapy. On the other hand, RS production at signaling levels promotes ischemic angiogenesis, mediates flow-induced dilation in patients with coronary artery disease, and instigates the activation of cell survival programs by conditioning stimuli that render tissues resistant to the deleterious effects of prolonged I/R. These topics will be reviewed in this article.
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Affiliation(s)
- Hong Yu
- Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, 1 Hospital Drive, Columbia, MO 65212, USA
| | - Ted Kalogeris
- Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, 1 Hospital Drive, Columbia, MO 65212, USA
| | - Ronald J Korthuis
- Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, 1 Hospital Drive, Columbia, MO 65212, USA; Dalton Cardiovascular Research Center, University of Missouri, 134 Research Park Drive, Columbia, MO 65211, USA.
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