1
|
Zhou L, Gan N, Zhou Y, Li T, Cao Y, Chen Y. A label-free and universal platform for antibiotics detection based on microchip electrophoresis using aptamer probes. Talanta 2017; 167:544-549. [PMID: 28340759 DOI: 10.1016/j.talanta.2017.02.061] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Revised: 02/22/2017] [Accepted: 02/26/2017] [Indexed: 11/29/2022]
Abstract
A novel label-free, universal, and high throughput aptasensor was developed based on a microchip electrophoresis (MCE) platform for automatic detection of antibiotic residues in food. Firstly, chloramphenicol (CAP) was employed as a model to be captured by its aptamer probe (Apt). Then, the partial complementary oligonucleotide of CAP's aptamer (C-DNA) was introduced into the reaction system. Because the Apt-CAP complex can't further hybrid with free C-DNA, the amount of hybrid Apt-C-DNA double strand DNA (dsDNA) was less than that without adding the target. Finally, the above mixture was introduced into the microchip electrophoresis (MCE) platform for detection, both dsDNA and Apt-CAP can be separated and produce different fluorescence signals in the MCE. In a certain concentration range, the ratio of signal between dsDNA and Apt-CAP (IdsDNA/I Apt-CAP) was proportional to the concentration of targets. Under the optimum conditions, the ratio showed a satisfactory linearity range from 0.008 to 1ng/mL of CAP with a detection limit of 0.003ng/mL. Thus, a universal MCE-based assay was developed for quantifying CAP automatically. The method was also successfully applied in the different food samples for CAP detection, which showed a good recovery (Milk: 91.1-108%, Fish: 86.1-114%) and the results were consistent with that of ELISA. This method owned many merits as follows: firstly, MCE was a high throughput screening platform and the detection time is limited to 3min for each sample. Secondly, the aptamer probes can be directly used for detection without labeling any signal tag which can facilitate the preparation procedures of probes. Thirdly, the operation was easy just by the following steps: firstly, the mixture of aptamer probes were incubated followed adding C-DNA; then measurement was performed. Moreover, the assay with MCE platform can be used to detect other targets just by changing the corresponding aptamer probe; it can even realize simultaneous detection when the targets have aptamers with different number of base pairs. Above all, it's a high- throughput and prospective method which can be applied in high throughput screening of antibiotics in food safety.
Collapse
Affiliation(s)
- Lingying Zhou
- Faculty of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Ning Gan
- Faculty of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.
| | - You Zhou
- Faculty of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Tianhua Li
- Faculty of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Yuting Cao
- Faculty of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Yinji Chen
- Department of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing University of Finance and Economics, Nanjing 210000, China
| |
Collapse
|
2
|
Protective Effect of Edaravone on Glutamate-Induced Neurotoxicity in Spiral Ganglion Neurons. Neural Plast 2016; 2016:4034218. [PMID: 27957345 PMCID: PMC5121579 DOI: 10.1155/2016/4034218] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 10/10/2016] [Indexed: 11/17/2022] Open
Abstract
Glutamate is an important excitatory neurotransmitter in mammalian brains, but excessive amount of glutamate can cause “excitotoxicity” and lead to neuronal death. As bipolar neurons, spiral ganglion neurons (SGNs) function as a “bridge” in transmitting auditory information from the ear to the brain and can be damaged by excessive glutamate which results in sensorineural hearing loss. In this study, edaravone, a free radical scavenger, elicited both preventative and therapeutic effects on SGNs against glutamate-induced cell damage that was tested by MTT assay and trypan blue staining. Ho.33342 and PI double staining revealed that apoptosis as well as necrosis took place during glutamate treatment, and apoptosis was the main type of cell death. Oxidative stress played an important role in glutamate-induced cell damage but pretreatment with edaravone alleviated cell death. Results of western blot demonstrated that mechanisms underlying the toxicity of glutamate and the protection of edaravone were related to the PI3K pathway and Bcl-2 protein family.
Collapse
|
3
|
Zhang Y, Yang Y, Zhang GZ, Gao M, Ge GZ, Wang QQ, Ji XC, Sun YL, Zhang HT, Xu RX. Stereotactic Administration of Edaravone Ameliorates Collagenase-Induced Intracerebral Hemorrhage in Rat. CNS Neurosci Ther 2016; 22:824-35. [PMID: 27390192 PMCID: PMC5095785 DOI: 10.1111/cns.12584] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 05/18/2016] [Accepted: 06/04/2016] [Indexed: 12/27/2022] Open
Abstract
Background Edaravone is widely used for treating ischemic stroke, but it is not still confirmed in intracerebral hemorrhage (ICH) as an ideal medication targeting the brain parenchyma. We aimed to investigate the neuroprotective effects of stereotactic administration of edaravone (SI) into the brain parenchyma. Methods Intracerebral hemorrhage rat models were established by infusion of collagenase into the caudate nucleus. Neural functional recovery was assessed using modified neurological severity scores (mNSS). A comparative study of therapeutic effects between SI and intraperitoneal injection of edaravone (IP) involved in cerebral edema, blood–brain barrier (BBB) permeability, hematoma absorption, inflammatory response and neuronal apoptosis. Results Compared with IP, the mNSS was significantly (P < 0.05) improved by SI; cerebral edema and BBB permeability were dramatically ameliorated (P < 0.05); IL‐4 and IL‐10 levels increased, but IL‐1β and TNF‐α levels significantly decreased; neuron apoptosis decreased markedly (P < 0.05); and caspase‐3 and Bax expression significantly dropped, but Bcl‐2 increased in SI group (P < 0.05). Conclusion SI markedly improved neurological deficits in ICH rat models via antiinflammatory and antiapoptosis mechanisms and promoted M2‐type microglia differentiation. SI was effective in rats with collagenase‐induced ICH.
Collapse
Affiliation(s)
- Yan Zhang
- The Third Military Medical University, Chongqing, China.,Affiliated Bayi Brain Hospital, Army General Hospital of PLA, Beijing, China.,The Neurosurgical Research Center of Beijing Military Region, Beijing, China
| | - Yang Yang
- Affiliated Bayi Brain Hospital, Army General Hospital of PLA, Beijing, China
| | - Guang-Zhu Zhang
- Affiliated Bayi Brain Hospital, Army General Hospital of PLA, Beijing, China
| | - Mou Gao
- Affiliated Bayi Brain Hospital, Army General Hospital of PLA, Beijing, China
| | - Guang-Zhi Ge
- Affiliated Bayi Brain Hospital, Army General Hospital of PLA, Beijing, China
| | - Qin-Qin Wang
- Affiliated Bayi Brain Hospital, Army General Hospital of PLA, Beijing, China
| | - Xin-Chao Ji
- Affiliated Bayi Brain Hospital, Army General Hospital of PLA, Beijing, China
| | - Yi-Lin Sun
- Department of Ultrapathology of Beijing Neurosurgical Institute, Beijing, China
| | - Hong-Tian Zhang
- Affiliated Bayi Brain Hospital, Army General Hospital of PLA, Beijing, China. .,The Neurosurgical Research Center of Beijing Military Region, Beijing, China.
| | - Ru-Xiang Xu
- Affiliated Bayi Brain Hospital, Army General Hospital of PLA, Beijing, China. .,The Neurosurgical Research Center of Beijing Military Region, Beijing, China.
| |
Collapse
|
4
|
Im GJ, Chang J, Lee S, Choi J, Jung HH, Lee HM, Ryu SH, Park SK, Kim JH, Kim HJ. Protective role of edaravone against cisplatin-induced ototoxicity in an auditory cell line. Hear Res 2015; 330:113-8. [DOI: 10.1016/j.heares.2015.08.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 07/31/2015] [Accepted: 08/12/2015] [Indexed: 10/23/2022]
|
5
|
Gao G, Liu Y, Zhou CH, Jiang P, Sun JJ. Solid lipid nanoparticles loaded with edaravone for inner ear protection after noise exposure. Chin Med J (Engl) 2015; 128:203-9. [PMID: 25591563 PMCID: PMC4837839 DOI: 10.4103/0366-6999.149202] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND Antioxidants and the duration of treatment after noise exposure on hearing recovery are important. We investigated the protective effects of an antioxidant substance, edaravone, and its slow-release dosage form, edaravone solid lipid nanoparticles (SLNs), in steady noise-exposed guinea pigs. METHODS SLNs loaded with edaravone were produced by an ultrasound technique. Edaravone solution or edaravone SLNs were administered by intratympanic or intravenous injection after the 1 st day of noise exposure. Guinea pigs were exposed to 110 dB sound pressure level (SPL) noise, centered at 0.25-4.0 kHz, for 4 days at 2 h/d. After noise exposure, the guinea pigs underwent auditory brainstem response (ABR) threshold measurements, reactive oxygen species (ROS) were detected in their cochleas with electron spin resonance (ESR), and outer hair cells (OHCs) were counted with silvernitrate (AgNO 3 ) staining at 1, 4, and 6 days. RESULTS The ultrasound technique was able to prepare adequate edaravone SLNs with a mean particle size of 93.6 nm and entrapment efficiency of 76.7%. Acoustic stress-induced ROS formation and edaravone exerted a protective effect on the cochlea. Comparisons of hearing thresholds and ROS changes in different animal groups showed that the threshold shift and ROS generation were significantly lower in treated animals than in those without treatment, especially in the edaravone SLN intratympanic injection group. CONCLUSIONS Edaravone SLNs show noticeable slow-release effects and have certain protective effects against noise-induced hearing loss (NIHL).
Collapse
Affiliation(s)
| | | | | | | | - Jian-Jun Sun
- Center for Otolaryngology of the People's Liberation Army, Naval General Hospital, Beijing 100048, China
| |
Collapse
|
6
|
Choi J, Chang J, Jun HJ, Im GJ, Chae SW, Lee SH, Kwon SY, Jung HH, Chung AY, Park HC. Protective role of edaravone against neomycin-induced ototoxicity in zebrafish. J Appl Toxicol 2014; 34:554-61. [PMID: 24795994 DOI: 10.1002/jat.2964] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Aminoglycosides such as neomycin are one of the most commonly prescribed types of antibiotics worldwide. However, these drugs appear to generate free radicals within the inner ear, which can result in permanent hearing loss. We evaluated the effects of edaravone, a neuroprotective agent, on neomycin-induced ototoxicity in transgenic zebrafish. The 5-day post fertilization (dpf) zebrafish larvae were exposed to 125 μM neomycin and various concentrations of edaravone for 1 h. Hair cell survival was calculated as average numbers of the hair cells in the control group, which was not exposed to neomycin. Ultrastructural changes were evaluated using a scanning electron microscope (SEM) and transmission electron microscope (TEM). Edaravone protected against neomycin-induced hair cell loss in the neuromasts (1000 μM: 11.6 ± 1.1 cells, neomycin only: 5.5 ± 0.5 cells; n = 10, P<0.05) and decreased the TUNEL reaction for detecting apoptosis. In ultrastructural analysis, structures of mitochondria and hair cells within neuromasts were preserved in zebrafish exposed to 125 μM neomycin and 1000 μM edaravone for 1 h. Edaravone protected against neomycin-induced hair cell loss by preventing apoptosis.
Collapse
MESH Headings
- Animals
- Animals, Genetically Modified
- Antipyrine/analogs & derivatives
- Antipyrine/pharmacology
- Apoptosis/drug effects
- Cells, Cultured
- Dose-Response Relationship, Drug
- Edaravone
- Embryo, Nonmammalian/drug effects
- Embryo, Nonmammalian/ultrastructure
- Hair Cells, Auditory/drug effects
- Hair Cells, Auditory/ultrastructure
- In Situ Nick-End Labeling
- Microscopy, Confocal
- Microscopy, Electron, Scanning
- Microscopy, Electron, Transmission
- Mitochondria/drug effects
- Mitochondria/ultrastructure
- Neomycin/toxicity
- Neuroprotective Agents/pharmacology
- Zebrafish/embryology
- Zebrafish/genetics
Collapse
|
7
|
Tsuruma K, Yamauchi M, Inokuchi Y, Sugitani S, Shimazawa M, Hara H. Role of oxidative stress in retinal photoreceptor cell death in N-methyl-N-nitrosourea-treated mice. J Pharmacol Sci 2012; 118:351-62. [PMID: 22362184 DOI: 10.1254/jphs.11110fp] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
This study aimed to investigate whether oxidative stress contributes to retinal cell death in a mouse model of photoreceptor degeneration induced by N-methyl-N-nitrosourea (MNU). We measured in vitro MNU-induced radical production in retinal cell cultures of murine 661W photoreceptor-derived cells; RGC-5, a mouse ganglion cell line; and primary retinal cells. The addition of MNU induced oxidative radical generation in 661W and primary retinal cells, but not in RGC-5 cells. Edaravone, a free radical scavenger, at 1 µM reduced MNU-induced radical production in 661W and primary retinal cells. To induce in vivo retinal photoreceptor degeneration in mice, we administered 60 mg/kg MNU by intraperitoneal injection. We intravenously administered 1 mg/kg edaravone immediately and at 6 h after the MNU injection. Retinal photoreceptor degeneration was evaluated by measuring the thickness of the outer nuclear layer (ONL) by terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) staining and by oxidative stress markers. MNU caused photoreceptor cell loss at 7 days after administration. Edaravone inhibited ONL thinning and reduced TUNEL-positive cells and the oxidative stress markers. These findings indicate that MNU leads to selective photoreceptor degradation via oxidative stress in vitro and in vivo and may help to understand the pathogenic mechanism of retinitis pigmentosa.
Collapse
Affiliation(s)
- Kazuhiro Tsuruma
- Molecular Pharmacology, Department of Biofunctional Evaluation, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | | | | | | | | | | |
Collapse
|
8
|
Abstract
PURPOSE OF REVIEW Treatment of auditory and vestibular dysfunction has become increasingly dependent on inner ear drug delivery. Recent advances in molecular therapy and nanotechnology have pushed development of alternate delivery methodologies involving both transtympanic and direct intracochlear infusions. This review examines recent developments in the field relevant to both clinical and animal research environments. RECENT FINDINGS Transtympanic delivery of gentamicin and corticosteroids for the treatment of Meniere's disease and sudden sensorineural hearing loss continues to be clinically relevant, with understanding of pharmacokinetics becoming more closely studied. Stabilizing matrices placed on the round window membrane for sustained passive delivery of compounds offer more controlled dosing profiles than transtympanic injections. Nanoparticles are capable of traversing the round window membrane and cochlear membranous partitions, and may become useful gene delivery platforms. Cochlear and vestibular hair cell regeneration has been demonstrated by vector delivery to the inner ear, offering promise for future advanced therapies. SUMMARY Optimal methods of inner ear drug delivery will depend on toxicity, therapeutic dose range, and characteristics of the agent to be delivered. Advanced therapy development will likely require direct intracochlear delivery with detailed understanding of associated pharmacokinetics.
Collapse
|
9
|
Yamashita H. [Treatment of labyrinthine diseases--the frontier of pre-clinical studies. Therapeutic strategy to protect the peripheral vestibular organ]. NIHON JIBIINKOKA GAKKAI KAIHO 2009; 112:12-17. [PMID: 19288620 DOI: 10.3950/jibiinkoka.112.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
|
10
|
Abstract
Over the last decade, important advances have been made to support the fact that reactive oxygen species (ROS) are generated and play a harmful role during the acute and late stages of cerebral ischemia. Several drugs, such as radical scavengers and antioxidants, have been evaluated in preclinical and clinical studies. Edaravone (3-methyl-1-phenyl-2-pyrazolin-5-one; Radicut, Mitsubishi Tanabe Pharma Corporation) is a novel antioxidant that is currently used in Japan for the treatment of patients in the acute stage of cerebral infarction. Edaravone scavenges ROS and inhibits proinflammatory responses after brain ischemia in animals and humans. In particular, postischemic inflammation, leading to brain edema and infarction due to neuronal damage and endothelial cell death, can be ameliorated by edaravone. In addition to these antistroke effects, edaravone has also been shown to prevent oxidative damage to various extracerebral organs. Therefore, in addition to its usefulness in the treatment of stroke, edaravone is expected to play an integral role in the treatment of many oxidative stress-related diseases.
Collapse
Affiliation(s)
- Toshiaki Watanabe
- Department of REDOX Medicinal Science, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan.
| | | | | |
Collapse
|
11
|
Accurate bond dissociation enthalpies of popular antioxidants predicted by the ONIOM-G3B3 method. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2007.03.012] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
12
|
Shimogori H, Takemoto T, Mikuriya T, Yamashita H. Edaravone protects the vestibular periphery from free radical-induced toxicity in response to perilymphatic application of (±)-α-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid. Eur J Pharmacol 2007; 554:223-8. [PMID: 17109855 DOI: 10.1016/j.ejphar.2006.10.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2006] [Revised: 10/01/2006] [Accepted: 10/05/2006] [Indexed: 11/21/2022]
Abstract
Intracochlear infusion of (+/-)-alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid (AMPA) was performed with a syringe pump in guinea pigs, and peripheral vestibular dysfunction was induced. Animals were administered edaravone systemically or topically. In the systemic application group, animals were administered edaravone once a day for 7 days after AMPA infusion. In the topical application group, edaravone-soaked gelfoam was placed on the round window membrane just after, 12 h after or 24 h after AMPA infusion. Spontaneous nystagmus was observed after AMPA infusion. Immunohistochemistry for 4-hydroxy-2-nonenal (4-HNE), a marker of free radical-induced lipid peroxidation, was performed 24 h after AMPA infusion. In addition, caloric tests were performed to evaluate vestibular function 1 week after AMPA infusion. Animals in both groups showed decreased spontaneous nystagmus, but results were not significant. Animals treated topically with edaravone within 12 h of AMPA infusion showed normal morphology of the ampullar sensory epithelia of the lateral semicircular canals and showed a good response to the caloric tests. 4-HNE immunoreactivity in the sensory epithelia was very low in these animals. In contrast, untreated animals and animals treated with edaravone systemically or topically 24 h after AMPA infusion showed morphologic hair cell damage, reduced caloric response and remarkable 4-HNE immunoreactivity in the sensory epithelia. These results indicate that topical application of edaravone within 12 h after damage protects the vestibular periphery from free radical-induced toxicity in response to intracochlear infusion of AMPA.
Collapse
Affiliation(s)
- Hiroaki Shimogori
- Department of Otolaryngology, Yamaguchi University School of Medicine, 1-1-1 Minamikogushi, Ube, Yamaguchi 755-8505, Japan.
| | | | | | | |
Collapse
|
13
|
Takeno K, Shimogori H, Takemoto T, Tanaka K, Mikuriya T, Orita H, Yamashita H. The systemic application of diazepam facilitates the reacquisition of a well-balanced vestibular function in a unilateral vestibular re-input model with intracochlear tetrodotoxin infusion using an osmotic pump. Brain Res 2006; 1096:113-9. [PMID: 16756965 DOI: 10.1016/j.brainres.2006.04.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2005] [Revised: 04/07/2006] [Accepted: 04/10/2006] [Indexed: 11/18/2022]
Abstract
Diazepam is a popular medicine used in the treatment of acute vertigo. In the past, many studies investigating the effect of diazepam in peripheral vestibular destruction have been reported. However, no previous study has yet investigated the effect of diazepam on a model with a transient and reversible vestibular function similar to recurrent vertigo as seen in Meniere's disease. We thus made a peripheral vestibular re-input model by the unilateral intracochlear administration of tetrodotoxin (TTX) using an osmotic pump and then examined the influence of diazepam on the vestibular system in this model. Hartley white guinea pigs were intracochlearly administered with TTX on the right side for 3 days by an osmotic pump. Animals were divided into three groups, TTX alone (control group (n = 7)), TTX and an intraperitoneal diazepam injection once a day for 3 days (diazepam group (n = 6)) and vehicle injection (vehicle group (n = 6)). A caloric response and vestibuloocular reflex (VOR) were observed at 7 and 14 days after completing 3 days of TTX administration. Seven days after vestibular re-input, a directional preponderance of the nystagmus (DP) to the TTX-treated side was observed in the control and vehicle groups on VOR examination. DP was not observed in the diazepam group on any examined day. The R/L time ratio of caloric response showed no statistical difference between three groups on any examined day. These results suggest that diazepam may thus be useful for patients in an acute stage of peripheral vestibular vertigo by decreasing their vertiginous symptoms.
Collapse
Affiliation(s)
- Kenji Takeno
- Department of Otolaryngology, Yamaguchi University School of Medicine, Ube, Japan
| | | | | | | | | | | | | |
Collapse
|
14
|
Takumida M, Anniko M. Protective effect of edaravone against the ototoxicity of Pseudomonas aeruginosa exotoxin A. Acta Otolaryngol 2006; 126:15-9. [PMID: 16308249 DOI: 10.1080/00016480510038563] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
CONCLUSION Our findings suggest that edaravone can protect against cochlear damage caused by Pseudomonas aeruginosa exotoxin A (PaExoA). OBJECTIVE To analyze the protective effect of a free radical scavenger, edaravone, against the ototoxicity resulting from exposure of the middle ear to PaExoA. MATERIAL AND METHODS In nine groups of albino rats the following solutions were instilled either via the tympanic membrane into the round window niche [intratympanically (i.t.)] or intravenously (i.v.): edaravone (i.v.); edaravone (i.t.); PaExoA (i.t.) + edaravone (i.t.; simultaneously); PaExoA (i.t.) + edaravone (i.t.; 1 h after); PaExoA (i.t.) + edaravone (i.t.; 24 h after); PaExoA (i.t.) + edaravone (i.v.; simultaneously); PaExoA (i.t.) + edaravone (i.v.; 1 h after); PaExoA (i.t.) + edaravone (i.v.; 24 h after); PaExoA (i.t.) + saline (i.v.). Frequency-specific (2-20 kHz) auditory brainstem responses were measured to determine hearing thresholds before and 2, 5 and 10 days after instillation. RESULTS PaExoA had penetrated from the middle ear into the cochlea and caused hearing loss. This impairment was blocked by intratympanic injection of edaravone when given simultaneously or 1 h after the first instillation of PaExoA, or by intravenous injection of edaravone when given simultaneously. There were significant differences in protective effect between the intratympanic and intravenous routes.
Collapse
Affiliation(s)
- Masaya Takumida
- Department of Otolaryngology, Faculty of Medicine, Hiroshima University, Minamiku, Hiroshima, Japan.
| | | |
Collapse
|
15
|
Hara H, Takeno K, Shimogori H, Yamashita H. CGRP Expression in the Vestibular Periphery after Transient Blockage of Bilateral Vestibular Input. ORL J Otorhinolaryngol Relat Spec 2005; 67:259-65. [PMID: 16374057 DOI: 10.1159/000089405] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
This study aimed to establish an animal model of reversible bilateral vestibular disorders that is suitable for examining the mechanisms of vestibular plasticity, and to observe the changes in the plasticity of vestibular efferent systems. Tetrodotoxin (TTX) was infused continuously for 7 days into the bilateral perilymph of guinea pig cochlea. We assessed the vestibulo-ocular reflex (VOR) for evaluating the vestibular function. We also investigated the changes in calcitonin gene-related peptide (CGRP) immunoreactivity in vestibular end organs to observe the changes in the plasticity of vestibular systems. The VOR was completely eliminated by TTX administration and returned to the preoperative levels within 120 h after TTX discontinuation. An obvious increase in the number of CGRP-immunoreactive fibers was observed within the neurosensory epithelia of the maculae and cristae. An animal model of reversible bilateral vestibular disorders was established and used for investigating the plasticity of the vestibular nervous system.
Collapse
Affiliation(s)
- Hirotaka Hara
- Department of Otolaryngology, Yamaguchi University School of Medicine, Ube, Yamaguchi, Japan.
| | | | | | | |
Collapse
|
16
|
Tanaka K, Takemoto T, Sugahara K, Okuda T, Mikuriya T, Takeno K, Hashimoto M, Shimogori H, Yamashita H. Post-exposure administration of edaravone attenuates noise-induced hearing loss. Eur J Pharmacol 2005; 522:116-21. [PMID: 16202992 DOI: 10.1016/j.ejphar.2005.08.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2005] [Revised: 08/08/2005] [Accepted: 08/15/2005] [Indexed: 10/25/2022]
Abstract
We investigated the effects of the antioxidant edaravone against acoustic trauma in guinea pigs. Edaravone (1.722 x 10(-2) M) was infused into the right ear by an osmotic pump, and the left ear was untreated for control. Animals received edaravone 9 h before (-9 h group, n = 7) and 9 h (+9 h group, n = 8), 21 h (+21 h group, n = 7) and 33 h (+33 h group, n = 4) after 3-h exposure to 130-dB noise. Seven days after noise exposure, we examined the shift in auditory brainstem response thresholds and histopathologic characteristics of the sensory epithelia. The smallest shift in auditory brainstem response threshold and smallest proportion of missing outer hair cells were observed in the +9 h group. This result was supported by immunohistochemical analysis of 4-hydroxy-2-nonenal. Our data suggest that edaravone may be clinically effective in the treatment of acoustic trauma, especially if given within 21 h of noise exposure.
Collapse
Affiliation(s)
- Kuniyoshi Tanaka
- Department of Otolaryngology, Yamaguchi University School of Medicine, Ube, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Takemoto T, Sugahara K, Okuda T, Shimogori H, Yamashita H. The clinical free radical scavenger, edaravone, protects cochlear hair cells from acoustic trauma. Eur J Pharmacol 2004; 487:113-6. [PMID: 15033382 DOI: 10.1016/j.ejphar.2004.01.019] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2003] [Revised: 01/15/2004] [Accepted: 01/21/2004] [Indexed: 10/26/2022]
Abstract
It is known that reactive oxygen species have toxicity to the cochlea. We investigated the effect of edaravone, a free radical scavenger for clinical use, on the cochleae of guinea pigs subjected to acoustic trauma. We assessed auditory brainstem response (ABR) thresholds to evaluate cochlear function and observed the sensory epithelium. After noise exposure (130 dB SPL, 3 h), we observed that the auditory brainstem response threshold shift in edaravone-treated ears was significantly less than that in untreated ears. This result suggests that edaravone protected the cochleae from acoustic trauma.
Collapse
MESH Headings
- Animals
- Antipyrine/analogs & derivatives
- Antipyrine/pharmacology
- Cochlea/injuries
- Cochlea/pathology
- Drug Implants
- Edaravone
- Evoked Potentials, Auditory, Brain Stem/drug effects
- Free Radical Scavengers/pharmacology
- Guinea Pigs
- Hair Cells, Auditory/injuries
- Hair Cells, Auditory/pathology
- Hair Cells, Auditory, Outer/injuries
- Hair Cells, Auditory, Outer/pathology
- Hearing Loss, Noise-Induced/pathology
- Hearing Loss, Noise-Induced/prevention & control
- Noise/adverse effects
- Organ of Corti/pathology
Collapse
Affiliation(s)
- Tsuyoshi Takemoto
- Department of Otolaryngology, Yamaguchi University School of Medicine, Minamikogushi 1-1-1, Ube, Yamaguchi 755-8505, Japan
| | | | | | | | | |
Collapse
|
18
|
Horiike O, Shimogori H, Yamashita H. Effect of Edaravone on Streptomycin-Induced Vestibulotoxicity in the Guinea Pig. Laryngoscope 2004; 114:1630-2. [PMID: 15475794 DOI: 10.1097/00005537-200409000-00023] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES/HYPOTHESIS The effect of topical administration of edaravone to the inner ear was investigated in guinea pigs with streptomycin-induced vestibulotoxicity. METHODS Vestibulotoxicity was induced in 20 animals by delivery of streptomycin into the inner ear through osmotic pump for 24 hours. Edaravone (n = 8, systemic administration group) or saline (n = 6, control group) was injected intraperitoneally once a day for 7 days or edaravone-soaked Gelfoam was placed on the round window before wound closure (n = 6, topical administration group). RESULTS Yaw head tilt and spontaneous nystagmus were observed in all animals after the operation. The number of spontaneous nystagmus beats in the topical administration group was statistically less than that in other two groups at 12, 18, and 24 hours after the operation. CONCLUSION The study results suggest that topical administration of edaravone better suppresses streptomycin-induced vestibulotoxicity than systemic administration.
Collapse
Affiliation(s)
- Osamu Horiike
- Department of Otolaryngology, Yamaguchi University School of Medicine, Yamaguchi, Japan
| | | | | |
Collapse
|
19
|
Wang LF, Zhang HY. A theoretical investigation on DPPH radical-Scavenging mechanism of edaravone. Bioorg Med Chem Lett 2003; 13:3789-92. [PMID: 14552780 DOI: 10.1016/j.bmcl.2003.07.016] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The mechanism of edaravone (3-methyl-1-phenyl-2-pyrazolin-5-one) to scavenge DPPH radical is clarified by density functional theory (DFT) calculations. It is revealed that H-atom-abstraction rather than electron-transfer reaction is involved in the radical-scavenging process of edaravone, and H-atom at position 4 is readily to be abstracted. The C-H bond dissociation enthalpy (BDE) of edaravone is higher than the O-H BDE of alpha-tocopherol, accounting for the activity difference between the two antioxidants. As substituents have little influence on the C-H BDE, 2-pyrazolin-5-one is recognized as the active center for edaravone.
Collapse
Affiliation(s)
- Lan-Fen Wang
- Laboratory for Computational Biology, Shandong Provincial Research Center for Bioinformatic Engineering and Technique, Shandong University of Technology, Zibo 255049, P.R. China
| | | |
Collapse
|