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Tega Y, Takeuchi T, Nagano M, Makino R, Kubo Y, Akanuma SI, Hosoya KI. Characterization of LysoTracker Red uptake by in vitro model cells of the outer blood-retinal barrier: Implication of lysosomal trapping with cytoplasmic vacuolation and cytotoxicity. Drug Metab Pharmacokinet 2023; 51:100510. [PMID: 37451173 DOI: 10.1016/j.dmpk.2023.100510] [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: 12/22/2022] [Revised: 04/18/2023] [Accepted: 04/20/2023] [Indexed: 07/18/2023]
Abstract
Lysosomal trapping, a physicochemical process in which lipophilic cationic compounds are sequestered in lysosomes, can affect drug disposition and cytotoxicity. To better understand lysosomal trapping at the outer blood-retinal barrier (BRB), we investigated the distribution of LysoTracker Red (LTR), a probe compound for lysosomal trapping, in conditionally immortalized rat retinal pigment epithelial (RPE-J) cells. LTR uptake by RPE-J cells was dependent on temperature and attenuated by ammonium chloride and protonophore, which decreased the pH gradient between the lysosome and cytoplasm, suggesting lysosomal trapping of LTR in RPE-J cells. The involvement of lysosomal trapping in response to cationic drugs, including neuroprotectants such as desipramine and memantine, was also suggested by an inhibition study of LTR uptake. Chloroquine, which is known to show ocular toxicity, induced cytoplasmic vacuolization in RPE-J cells with a half-maximal effective concentration of 1.35 μM. This value was 59 times lower than the median lethal concentration (= 79.1 μM) of chloroquine, suggesting that vacuolization was not a direct trigger of cell death. These results are helpful for understanding the lysosomal trapping of cationic drugs, which is associated with drug disposition and cytotoxicity in the outer BRB.
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Affiliation(s)
- Yuma Tega
- Department of Pharmaceutics, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Japan
| | - Toshinari Takeuchi
- Department of Pharmaceutics, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Japan
| | - Masatoshi Nagano
- Department of Pharmaceutics, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Japan
| | - Reina Makino
- Department of Pharmaceutics, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Japan
| | - Yoshiyuki Kubo
- Department of Pharmaceutics, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Japan
| | - Shin-Ichi Akanuma
- Department of Pharmaceutics, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Japan.
| | - Ken-Ichi Hosoya
- Department of Pharmaceutics, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Japan
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2
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Nagano M, Nakamura T, Nagai T, Mochihashi D, Kobayashi I. Spatio-temporal categorization for first-person-view videos using a convolutional variational autoencoder and Gaussian processes. Front Robot AI 2022; 9:903450. [PMID: 36246490 PMCID: PMC9562109 DOI: 10.3389/frobt.2022.903450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 08/22/2022] [Indexed: 11/20/2022] Open
Abstract
In this study, HcVGH, a method that learns spatio-temporal categories by segmenting first-person-view (FPV) videos captured by mobile robots, is proposed. Humans perceive continuous high-dimensional information by dividing and categorizing it into significant segments. This unsupervised segmentation capability is considered important for mobile robots to learn spatial knowledge. The proposed HcVGH combines a convolutional variational autoencoder (cVAE) with HVGH, a past method, which follows the hierarchical Dirichlet process-variational autoencoder-Gaussian process-hidden semi-Markov model comprising deep generative and statistical models. In the experiment, FPV videos of an agent were used in a simulated maze environment. FPV videos contain spatial information, and spatial knowledge can be learned by segmenting them. Using the FPV-video dataset, the segmentation performance of the proposed model was compared with previous models: HVGH and hierarchical recurrent state space model. The average segmentation F-measure achieved by HcVGH was 0.77; therefore, HcVGH outperformed the baseline methods. Furthermore, the experimental results showed that the parameters that represent the movability of the maze environment can be learned.
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Affiliation(s)
- Masatoshi Nagano
- Department of Mechanical Engineering and Intelligent Systems, The University of Electro-Communications, Tokyo, Japan
- *Correspondence: Masatoshi Nagano,
| | - Tomoaki Nakamura
- Department of Mechanical Engineering and Intelligent Systems, The University of Electro-Communications, Tokyo, Japan
| | - Takayuki Nagai
- Department of Systems Science, Osaka University, Osaka, Japan
- Artificial Intelligence eXploration Research Center, The University of Electro-Communications, Tokyo, Japan
| | - Daichi Mochihashi
- Department of Statistical Inference and Mathematics, The Institute of Statistical Mathematics, Tokyo, Japan
| | - Ichiro Kobayashi
- Department of Information Sciences, Ochanomizu University, Tokyo, Japan
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Furukawa E, Chen Z, Kubo T, Chelenga M, Wu Y, Chiba H, Yanagawa Y, Katagiri S, Hui S, Nagano M. 100 Effects of days in milk and body condition score loss after parturition on oocyte triacylglycerol content in Holstein cows. Reprod Fertil Dev 2021; 34:287. [PMID: 35231236 DOI: 10.1071/rdv34n2ab100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Affiliation(s)
- E Furukawa
- Laboratory of Theriogenology, School of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Z Chen
- Department of Health Sciences and Technology, Faculty of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan
| | - T Kubo
- Dairy Cattle Group, Dairy Research Center, Hokkaido Research Organization, Nakashibetsu, Hokkaido, Japan
| | - M Chelenga
- Laboratory of Theriogenology, School of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Y Wu
- Department of Health Sciences and Technology, Faculty of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan
| | - H Chiba
- Department of Nutrition, Sapporo University of Health Sciences, Sapporo, Hokkaido, Japan
| | - Y Yanagawa
- Laboratory of Theriogenology, School of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - S Katagiri
- Laboratory of Theriogenology, School of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - S Hui
- Department of Health Sciences and Technology, Faculty of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan
| | - M Nagano
- Laboratory of Animal Reproduction, School of Veterinary Medicine, Kitasato University, Towada, Aomori, Japan
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Nagano M, Saitow F, Higo S, Uzuki M, Mikahara Y, Akimoto T, Ozawa H, Nishimori K, Suzuki H. Cesarean section delivery is a risk factor of autism-related behaviors in mice. Sci Rep 2021; 11:8883. [PMID: 33903690 PMCID: PMC8076189 DOI: 10.1038/s41598-021-88437-8] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 04/12/2021] [Indexed: 12/19/2022] Open
Abstract
Cesarean section (C/S) is one way of delivering babies, and is chosen when mothers or babies are facing problems or life-threatening conditions during pregnancy. Many meta-analyses have suggested an etiological relationship between C/S delivery and autism spectrum disorders (ASDs). However, as a risk factor for ASDs, C/S delivery has not yet been well studied. Because C/S deliveries have been increasing, it is very important to investigate the causal association between C/S and ASDs. Here, using three approaches, we showed experimentally that C/S delivery induced ASD-like traits in offspring mice, and that some of these changes were ameliorated by one-time oxytocin (OXT) treatment. Treatment with OXT receptor antagonists before natural delivery also induced ASD-related behaviors. Moreover, wild-type mice born to OXT-KO dams showed similar changes. Thus, insufficient OXT exposure from dams to offspring during delivery may be a trigger for ASD-related behaviors.
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Affiliation(s)
- Masatoshi Nagano
- Department of Pharmacology, Graduate School of Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo, Japan.
| | - Fumihito Saitow
- Department of Pharmacology, Graduate School of Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo, Japan
| | - Shinpei Higo
- Department of Anatomy and Neurobiology, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan
| | - Makoto Uzuki
- Division of Laboratory Animal Science, Nippon Medical School, Tokyo, Japan
| | - Yasunori Mikahara
- Department of Pharmacology, Graduate School of Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo, Japan
| | - Toshio Akimoto
- Division of Laboratory Animal Science, Nippon Medical School, Tokyo, Japan
| | - Hitoshi Ozawa
- Department of Anatomy and Neurobiology, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan
| | - Katsuhiko Nishimori
- Department of Obesity and Internal Inflammation, Fukushima Medical University, Hikarigaoka 1, Fukushima, Fukushima, Japan
| | - Hidenori Suzuki
- Department of Pharmacology, Graduate School of Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo, Japan
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Nagano M, Nakamura T, Nagai T, Mochihashi D, Kobayashi I, Takano W. HVGH: Unsupervised Segmentation for High-Dimensional Time Series Using Deep Neural Compression and Statistical Generative Model. Front Robot AI 2019; 6:115. [PMID: 33501130 PMCID: PMC7805757 DOI: 10.3389/frobt.2019.00115] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Accepted: 10/22/2019] [Indexed: 11/25/2022] Open
Abstract
Humans perceive continuous high-dimensional information by dividing it into meaningful segments, such as words and units of motion. We believe that such unsupervised segmentation is also important for robots to learn topics such as language and motion. To this end, we previously proposed a hierarchical Dirichlet process–Gaussian process–hidden semi-Markov model (HDP-GP-HSMM). However, an important drawback of this model is that it cannot divide high-dimensional time-series data. Furthermore, low-dimensional features must be extracted in advance. Segmentation largely depends on the design of features, and it is difficult to design effective features, especially in the case of high-dimensional data. To overcome this problem, this study proposes a hierarchical Dirichlet process–variational autoencoder–Gaussian process–hidden semi-Markov model (HVGH). The parameters of the proposed HVGH are estimated through a mutual learning loop of the variational autoencoder and our previously proposed HDP-GP-HSMM. Hence, HVGH can extract features from high-dimensional time-series data while simultaneously dividing it into segments in an unsupervised manner. In an experiment, we used various motion-capture data to demonstrate that our proposed model estimates the correct number of classes and more accurate segments than baseline methods. Moreover, we show that the proposed method can learn latent space suitable for segmentation.
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Affiliation(s)
- Masatoshi Nagano
- Department of Mechanical Engineering and Intelligent Systems, The University of Electro-Communications, Tokyo, Japan
| | - Tomoaki Nakamura
- Department of Mechanical Engineering and Intelligent Systems, The University of Electro-Communications, Tokyo, Japan
| | - Takayuki Nagai
- Graduate School of Engineering Science, Osaka University, Osaka, Japan.,Artificial Intelligence Exploration Research Center, The University of Electro-Communications, Tokyo, Japan
| | - Daichi Mochihashi
- Department of Statistical Inference and Mathematics, The Institute of Statistical Mathematics, Tokyo, Japan
| | - Ichiro Kobayashi
- Advanced Sciences, Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo, Japan
| | - Wataru Takano
- Center for Mathematical Modeling and Data Science, Osaka University, Osaka, Japan
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Somura Y, Nagano M, Kimoto K, Oda M, Mori K, Shinkai T, Sadamasu K. Detection of norovirus in food samples collected during suspected food-handler-involved foodborne outbreaks in Tokyo. Lett Appl Microbiol 2019; 69:175-180. [PMID: 31220345 DOI: 10.1111/lam.13189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 11/26/2018] [Revised: 06/14/2019] [Accepted: 06/14/2019] [Indexed: 12/12/2022]
Abstract
Although norovirus (NoV) is the major cause of gastroenteritis, with the largest number of NoV food poisoning cases in Japan, limited information is available regarding NoV detection in food. This study aimed to detect NoV in food samples during the 2015-2016 suspected foodborne outbreaks in Tokyo; 352 food samples from 64 NoV food poisoning outbreaks were collected. Bacterial culturing was performed for sample pretreatment and real-time reverse transcription polymerase chain reaction was conducted for NoV screening. The NoV detection rate was 1·7% (6/352). NoV-positive food samples included leftover boxed lunch, mackerel fillet (foodstuff), aburi salmon slice (partially seared salmon slice), raw tuna as a chirashizushi ingredient, raw amberjack as a sushi topping and ice for drinks. Since fresh fish as sushi toppings or ingredients and ice were consumed without heating, they may present a higher risk of viral infection. NoV-positive food samples were obtained from five outbreaks, wherein food handlers were NoV-positive in four. Each partial VP1 sequence from food samples matched completely with those in NoV-positive individuals and food handlers. Hence, food handlers play a potentially important role in food-based NoV transmission in all five outbreaks; therefore, hygiene education among them is essential to prevent NoV foodborne outbreaks. SIGNIFICANCE AND IMPACT OF THE STUDY: Significance and Impact of the Study: Norovirus (NoV) is a leading cause of foodborne outbreak in Japan. The most frequent route of transmission in NoV foodborne outbreaks is secondary contamination via infected food handlers. However, limited information is available regarding NoV contamination in food samples. This study reports the detection of NoV in food samples to elucidate the source and route of NoV infection leading to outbreaks for 2 years in Tokyo. Our data potentially contribute to education and the development of safe food-handling strategies among food handlers and employees in the food industry through elucidation of risk factors associated with NoV contamination.
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Affiliation(s)
- Y Somura
- Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - M Nagano
- Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - K Kimoto
- Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - M Oda
- Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - K Mori
- Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - T Shinkai
- Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
| | - K Sadamasu
- Tokyo Metropolitan Institute of Public Health, Shinjuku-ku, Tokyo, Japan
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Abdel-Ghani MA, Yanagawa Y, Balboula AZ, Sakaguchi K, Kanno C, Katagiri S, Takahashi M, Nagano M. Astaxanthin improves the developmental competence of in vitro-grown oocytes and modifies the steroidogenesis of granulosa cells derived from bovine early antral follicles. Reprod Fertil Dev 2019; 31:272-281. [DOI: 10.1071/rd17527] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 06/29/2018] [Indexed: 12/22/2022] Open
Abstract
In this study we investigated the effect of astaxanthin (Ax), which exhibits strong antioxidant activity, during invitro growth (IVG) on the developmental competence of oocytes and steroidogenesis of granulosa cells derived from early antral follicles. Bovine oocyte–cumulus–granulosa complexes collected from early antral follicles were cultured for 12 days in the presence or absence (control) of 500µM Ax. The viability of oocytes and antrum formation in the granulosa cell layer during IVG culture were greater in the presence than absence of Ax (P<0.05). Regardless of Ax treatment, 17β-oestradiol production increased during IVG culture; however, progesterone production was significantly lower in the presence than absence of Ax (P<0.05). Reactive oxygen species levels were lower in Ax-treated oocytes than in controls after IVG (P<0.05). Although nuclear maturation and cleavage rates did not differ between the Ax-treated and control groups, Ax treatment led to weaker cathepsin B activity in oocytes and better blastocyst rates than in controls (P<0.05). Accordingly, Ax treatment during IVG increased the total number of cells in blastocysts (P<0.05). These results indicate that Ax supplementation of IVG medium improves the quality of bovine oocytes due to its antioxidative effects on growing oocytes and its suppression of the luteinisation of granulosa cells.
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8
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Sakaguchi K, Yanagawa Y, Yoshioka K, Suda T, Kawano K, Katagiri S, Nagano M. 120 Effects of antral follicle count in ovaries on follicular development and endocrine dynamics of follicle-stimulating hormone and steroid hormones in cattle. Reprod Fertil Dev 2019. [DOI: 10.1071/rdv31n1ab120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The antral follicle count (AFC) in mammalian ovaries positively correlates with female fertility. We have reported previously that cumulus-oocyte complexes derived from high-AFC ovaries produce more oestradiol-17β (E2) and have higher developmental competence than those from low-AFC ovaries in in vitro growth (Sakaguchi et al. WCRB2017, Okinawa, Japan; 1-15). We also indicated that follicular growth was different between high- and low-AFC cows, and that follicular deviation occurred earlier in high-AFC cows (Nagai et al. 2015 Anim. Reprod. Sci. 163, 172-178). To clarify the causes of the higher E2 production and earlier follicular deviation in high-AFC cows, we investigated circulating steroid hormones and FSH during the oestrous cycle, as well as steroidogenesis in follicles at different phases of the oestrous cycle. Four high-AFC cows (>40 follicles) and 3 low-AFC cows (<20 follicles) based on the peak AFC were used. We ablated their follicles 8 days after oestrus and administered prostaglandin F2α on Day 12. After 40h of prostaglandin F2α injection, follicular fluid of a dominant follicle (preovulatory phase) was collected and subordinate follicles were ablated. Gonadotropin-releasing hormone was then injected to induce LH surge. Seven days after gonadotropin-releasing hormone, follicular fluids were collected from dominant follicles (luteal phase) and all follicles were ablated. Four days later, follicular fluids were again collected from the largest follicles (selection phase). Steroid hormones in follicular fluids were measured by enzyme immunoassay. Throughout the study, we daily examined ovaries by ultrasonography and collected blood for hormone measurements. We analysed data using two-way ANOVA followed by Tukey-Kramer or Student’s t test. The number of small follicles (<4mm) was greater in high-AFC than low-AFC groups (low v. high=7.6v. 46.9; P<0.05), whereas that of large follicles (>8mm) was similar between groups (0.8v. 0.8) at any time. Although the number of medium-sized follicles (4-8mm) was not affected in the low-AFC group (4.2-6.7) after follicle ablation, the number increased from 1 to 4 days (10.5 to 17.8) then decreased 6 days after follicle ablation (11.5) in the high-AFC group, which means that degradation of follicles occurs at selection phase in high-AFC cows. Peripheral FSH concentration was higher (low v. high: 4.7v. 2.1 ng/mL), but E2 concentration was lower in the low-AFC (2.4 pg/mL) than high-AFC group (3.3 pg/mL) during the selection phase (P<0.05). Although follicular diameter was similar in both groups at any phase, E2 (low v. high=333.8v. 1127.4 ng/mL; P<0.05) and testosterone (low v. high=16.7v. 35.0 ng/mL; P=0.07), but not progesterone, concentrations were higher in the high-AFC than low-AFC group in the preovulatory phase. These findings suggest that a lower response to FSH causes low E2 production in the low-AFC group, resulting in high FSH concentration and a consistent development of medium-sized follicles. Conversely, higher E2 concentration suppresses FSH secretion, resulting in obvious degradation of follicles in the high-AFC group at the selection phase.
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Nagano M. PO485 Safety Spending Nights In a Car (SNC) at Big Disasters-Frequent Occurrence of Venous Thromboembolism (VTE) at Kumamoto Earthquake of 2016-. Glob Heart 2018. [DOI: 10.1016/j.gheart.2018.09.373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Nagano M, Saito K, Kozuka Y, Shibusawa M, Imai N, Noro A, Kageyama Y, Mizuno T, Ogawa T, Katayama N. PD-L1 expression on circulating monocytes in patients with breast cancer. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy427.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nagano M, Takumi T, Suzuki H. Critical roles of serotonin-oxytocin interaction during the neonatal period in social behavior in 15q dup mice with autistic traits. Sci Rep 2018; 8:13675. [PMID: 30209293 PMCID: PMC6135829 DOI: 10.1038/s41598-018-32042-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 08/29/2018] [Indexed: 12/01/2022] Open
Abstract
Disturbance of neurotransmitters and neuromodulators is thought to underlie the pathophysiology of autism spectrum disorder (ASD). Studies of 15q dup mouse models of ASD with human 15q11–13 duplication have revealed that restoring serotonin (5-HT) levels can partially reverse ASD-related symptoms in adults. However, it remains unclear how serotonin contributes to the behavioral symptoms of ASD. In contrast, oxytocin (OXT) has been found to involve social and affiliative behaviors. In this study, we examined whether serotonin-OXT interaction during the early postnatal period plays a critical role in the restoration of social abnormality in 15q dup mice. OXT or the 5-HT1A receptor agonist 8OH-DPAT treatment from postnatal day 7 (PD7) to PD21 ameliorated social abnormality in the three-chamber social interaction test in adult 15q dup mice. The effect of 8OH-DPAT was inhibited by blockade of OXT receptors in 15q dup mice. Thus, serotonin-OXT interaction via 5-HT1A receptors plays a critical role in the normal development of social behavior in 15q dup mice. Therefore, targeting serotonin-OXT interaction may provide a novel therapeutic strategy for treatment of ASD.
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Affiliation(s)
- Masatoshi Nagano
- Department of Pharmacology, Graduate School of Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo, Japan
| | - Toru Takumi
- RIKEN Brain Science Institute, Wako, Saitama, 351-0198, Japan.,Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Tokyo, Japan
| | - Hidenori Suzuki
- Department of Pharmacology, Graduate School of Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo, Japan. .,Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Tokyo, Japan.
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12
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Nagano M, Ota M, Kitai T, Konda T, Sasaki S, Kobori A, Kaji S, Furukawa Y. P3829Long-term serial changes in left atrial volume and function after catheter ablation for atrial fibrillation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p3829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M Nagano
- Kobe City Medical Center General Hospital, Clinical Laboratory, Kobe, Japan
| | - M Ota
- Kobe City Medical Center General Hospital, Cardiovascular Medicine, Kobe, Japan
| | - T Kitai
- Kobe City Medical Center General Hospital, Cardiovascular Medicine, Kobe, Japan
| | - T Konda
- Kobe City Medical Center General Hospital, Clinical Laboratory, Kobe, Japan
| | - S Sasaki
- Kobe City Medical Center General Hospital, Cardiovascular Medicine, Kobe, Japan
| | - A Kobori
- Kobe City Medical Center General Hospital, Cardiovascular Medicine, Kobe, Japan
| | - S Kaji
- Kobe City Medical Center General Hospital, Cardiovascular Medicine, Kobe, Japan
| | - Y Furukawa
- Kobe City Medical Center General Hospital, Cardiovascular Medicine, Kobe, Japan
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13
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Nagano R, Nagano M, Nakai A, Takeshita T, Suzuki H. Differential effects of neonatal SSRI treatments on hypoxia-induced behavioral changes in male and female offspring. Neuroscience 2017; 360:95-105. [PMID: 28778701 DOI: 10.1016/j.neuroscience.2017.07.051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 10/31/2016] [Revised: 07/19/2017] [Accepted: 07/19/2017] [Indexed: 02/07/2023]
Abstract
Prenatal hypoxia induced by transient intrauterine ischemia is a serious clinical problem, and at present, effective treatments are lacking. Currently, it is unknown how prenatal hypoxia affects behaviors in adulthood. Therefore, we developed a mouse model that mimics prenatal hypoxia in humans using uterine artery occlusion in late gestation. We examined whether prenatal hypoxia induces behavioral changes in adult male and female offspring by conducting a series of behavioral tests. In adulthood, longer immobility was observed in the forced swim test in males, whereas females showed decreased inhibition in the prepulse inhibition test. We then investigated the effects of two different selective serotonin reuptake inhibitors (SSRIs), fluoxetine (FLX) and escitalopram (ESC), on these behavioral changes. These drugs affect the neurodevelopmental process and have long-term neurological consequences. FLX treatment from postnatal day 3 (P3) to P21 ameliorated the behavioral changes in both male and female mice. In comparison, ESC treatment ameliorated the behavioral changes only in female mice. Neurochemical analysis revealed that dopamine was increased in the female hippocampus, but not in males. Thus, neonatal SSRI treatment decreases dopamine levels in the hippocampus in females selectively. Our findings suggest that prenatal hypoxia is a risk factor for behavioral abnormalities in adulthood, and that neonatal SSRI treatment might have clinical potential for alleviating these long-term behavioral deficits.
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Affiliation(s)
- Reiko Nagano
- Department of Obstetrics and Gynecology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan.
| | - Masatoshi Nagano
- Department of Pharmacology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan.
| | - Akihito Nakai
- Department of Obstetrics and Gynecology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan.
| | - Toshiyuki Takeshita
- Department of Obstetrics and Gynecology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan.
| | - Hidenori Suzuki
- Department of Pharmacology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan.
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Nakai N, Nagano M, Saitow F, Watanabe Y, Kawamura Y, Kawamoto A, Tamada K, Mizuma H, Onoe H, Watanabe Y, Monai H, Hirase H, Nakatani J, Inagaki H, Kawada T, Miyazaki T, Watanabe M, Sato Y, Okabe S, Kitamura K, Kano M, Hashimoto K, Suzuki H, Takumi T. Serotonin rebalances cortical tuning and behavior linked to autism symptoms in 15q11-13 CNV mice. Sci Adv 2017; 3:e1603001. [PMID: 28691086 PMCID: PMC5479676 DOI: 10.1126/sciadv.1603001] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 04/26/2017] [Indexed: 05/21/2023]
Abstract
Serotonin is a critical modulator of cortical function, and its metabolism is defective in autism spectrum disorder (ASD) brain. How serotonin metabolism regulates cortical physiology and contributes to the pathological and behavioral symptoms of ASD remains unknown. We show that normal serotonin levels are essential for the maintenance of neocortical excitation/inhibition balance, correct sensory stimulus tuning, and social behavior. Conversely, low serotonin levels in 15q dup mice (a model for ASD with the human 15q11-13 duplication) result in impairment of the same phenotypes. Restoration of normal serotonin levels in 15q dup mice revealed the reversibility of a subset of ASD-related symptoms in the adult. These findings suggest that serotonin may have therapeutic potential for discrete ASD symptoms.
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Affiliation(s)
- Nobuhiro Nakai
- RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan
- Graduate School of Biomedical Sciences, Hiroshima University, Minami, Hiroshima 734-8553, Japan
- Graduate School of Biostudies, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Masatoshi Nagano
- Graduate School of Medicine, Nippon Medical School, Bunkyo, Tokyo 113-8602, Japan
| | - Fumihito Saitow
- Graduate School of Medicine, Nippon Medical School, Bunkyo, Tokyo 113-8602, Japan
| | - Yasuhito Watanabe
- Graduate School of Biomedical Sciences, Hiroshima University, Minami, Hiroshima 734-8553, Japan
- Department of Clinical Neurobiology, University Hospital and German Cancer Research Center, Heidelberg 69120, Germany
- Corresponding author. (T.T.); (H.S.); (Yasuhito Watanabe)
| | - Yoshinobu Kawamura
- Graduate School of Biomedical Sciences, Hiroshima University, Minami, Hiroshima 734-8553, Japan
| | - Akiko Kawamoto
- Graduate School of Biomedical Sciences, Hiroshima University, Minami, Hiroshima 734-8553, Japan
| | - Kota Tamada
- RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan
- Graduate School of Biomedical Sciences, Hiroshima University, Minami, Hiroshima 734-8553, Japan
| | - Hiroshi Mizuma
- RIKEN Center for Life Science Technologies, Chuo, Kobe 650-0047, Japan
| | - Hirotaka Onoe
- RIKEN Center for Life Science Technologies, Chuo, Kobe 650-0047, Japan
| | | | - Hiromu Monai
- RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan
| | - Hajime Hirase
- RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan
| | - Jin Nakatani
- Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan
| | - Hirofumi Inagaki
- Graduate School of Medicine, Nippon Medical School, Bunkyo, Tokyo 113-8602, Japan
| | - Tomoyuki Kawada
- Graduate School of Medicine, Nippon Medical School, Bunkyo, Tokyo 113-8602, Japan
| | - Taisuke Miyazaki
- Department of Anatomy and Embryology, Hokkaido University Graduate School of Medicine, Kita, Sapporo 060-8638, Japan
| | - Masahiko Watanabe
- Department of Anatomy and Embryology, Hokkaido University Graduate School of Medicine, Kita, Sapporo 060-8638, Japan
| | - Yuka Sato
- Graduate School of Medicine, University of Tokyo, Bunkyo, Tokyo 113-8654, Japan
| | - Shigeo Okabe
- Graduate School of Medicine, University of Tokyo, Bunkyo, Tokyo 113-8654, Japan
| | - Kazuo Kitamura
- Graduate School of Medicine, University of Tokyo, Bunkyo, Tokyo 113-8654, Japan
| | - Masanobu Kano
- Graduate School of Medicine, University of Tokyo, Bunkyo, Tokyo 113-8654, Japan
| | - Kouichi Hashimoto
- Graduate School of Biomedical Sciences, Hiroshima University, Minami, Hiroshima 734-8553, Japan
| | - Hidenori Suzuki
- Graduate School of Medicine, Nippon Medical School, Bunkyo, Tokyo 113-8602, Japan
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Tokyo, Japan
- Corresponding author. (T.T.); (H.S.); (Yasuhito Watanabe)
| | - Toru Takumi
- RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan
- Graduate School of Biomedical Sciences, Hiroshima University, Minami, Hiroshima 734-8553, Japan
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Tokyo, Japan
- Corresponding author. (T.T.); (H.S.); (Yasuhito Watanabe)
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Fujimoto S, Ishikawa M, Nagano M, Sakamoto A. Influence of neonatal sevoflurane exposure on nerve development-related microRNAs and behavior of rats. Biomed Res 2016; 36:347-55. [PMID: 26700589 DOI: 10.2220/biomedres.36.347] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Commonly used anesthetics adversely affect the developing brain, but the mechanisms remain unknown. We previously showed that the expressions of microRNAs (miRNAs) in major organs are affected by anesthetics. Therefore, we used TaqMan low-density array (TLDA) to analyze gene expression in the hippocampus of neonatal rats exposed to sevoflurane and performed behavioral tests after they reached adulthood to evaluate cognitive and memory function. Rat male pups at postnatal day 7 were exposed to 1.9% sevoflurane for 3 h, and the hippocampus-miRNA expression profile on postnatal day 8 was determined. Open field and fear conditioning tests conducted during postnatal weeks 7 and 8 indicated that sevoflurane-exposed rats, but not controls, exhibited anxiety-like disorders. TLDA analysis identified 20 differentially expressed miRNAs, which were not shared between postnatally and maturely sevoflurane-exposed rats. The level of rno-miR-632, which targets brain-derived neurotrophic factor and calcium channel, voltage-dependent, alpha 2/delta subunit 2, increased by 10-fold, indicating that exposure to sevoflurane during early neural development alters hippocampus-miRNA expression and may induce subsequent behavioral disorders.
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Affiliation(s)
- Saiko Fujimoto
- Department of Anesthesiology and Pain Medicine, Graduate School of Medicine, Nippon Medical School
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Nagano M, Egger TP, Nemec K. CP-002 Managing polypharmacy in geriatric patients – a comparison of different assessment tools used for medication reviews. Eur J Hosp Pharm 2016. [DOI: 10.1136/ejhpharm-2016-000875.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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17
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Kawamura M, Nagano M. Alteration of sialoglycoprotein in the glomerular basement membrane of diabetic glomerulosclerosis. Contrib Nephrol 2015; 6:23-33. [PMID: 856536 DOI: 10.1159/000399749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The alteration of glycoprotein in the glomerular basement membrane in diabetic glomerulosclerosis was studied with preparative polyacrylamide gel electrophoresis by Uniphor column. Normal glomerular basement membrane was fractionated into 32 glycoprotein fractions. Decrease in sialic acid residue of sialoprotein was the characteristic finding observed in diabetic glomerulosclerosis. A hypothesis which explains the alteration of sialoglycoprotein is proposed.
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Nagahara N, Nagano M, Ito T, Shimamura K, Akimoto T, Suzuki H. Antioxidant enzyme, 3-mercaptopyruvate sulfurtransferase-knockout mice exhibit increased anxiety-like behaviors: a model for human mercaptolactate-cysteine disulfiduria. Sci Rep 2014; 3:1986. [PMID: 23759691 PMCID: PMC3680806 DOI: 10.1038/srep01986] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Accepted: 05/28/2013] [Indexed: 11/26/2022] Open
Abstract
Human mercaptolactate-cysteine disulfiduria (MCDU) was first recognized and reported in 1968. Most cases of MCDU are associated with mental retardation, while the pathogenesis remains unknown. To investigate it, we generated homozygous 3-mercaptopyruvate sulfurtransferase (MST: EC 2.8.1.2) knockout (KO) mice using C57BL/6 embryonic stem cells as an animal model. The MST-KO mice showed significantly increased anxiety-like behaviors with an increase in serotonin level in the prefrontal cortex (PFC), but not with abnormal morphological changes in the brain. MCDU can be caused by loss in the functional diversity of MST; first, MST functions as an antioxidant protein. MST possessing 2 redox-sensing molecular switches maintains cellular redox homeostasis. Second, MST can produce H2S (or HS−). Third, MST can also produce SOx. It is concluded that behavioral abnormality in MST-KO mice is caused by MST function defects such as an antioxidant insufficiency or a new transducer, H2S (or HS−) and/or SOx deficiency.
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Affiliation(s)
- Noriyuki Nagahara
- Isotope Research Center, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan.
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Ichikawa G, Komamiya S, Kamiya Y, Minami Y, Tani M, Geltenbort P, Yamamura K, Nagano M, Sanuki T, Kawasaki S, Hino M, Kitaguchi M. Observation of the spatial distribution of gravitationally bound quantum states of ultracold neutrons and its derivation using the Wigner function. Phys Rev Lett 2014; 112:071101. [PMID: 24579585 DOI: 10.1103/physrevlett.112.071101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Indexed: 06/03/2023]
Abstract
Ultracold neutrons (UCNs) can be bound by the potential of terrestrial gravity and a reflecting mirror. The wave function of the bound state has characteristic modulations. We carried out an experiment to observe the vertical distribution of the UCNs above such a mirror at the Institut Laue-Langevin in 2011. The observed modulation is in good agreement with that prediction by quantum mechanics using the Wigner function. The spatial resolution of the detector system is estimated to be 0.7 μm. This is the first observation of gravitationally bound states of UCNs with submicron spatial resolution.
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Affiliation(s)
- G Ichikawa
- Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - S Komamiya
- Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Y Kamiya
- Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Y Minami
- Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - M Tani
- Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - P Geltenbort
- Institut Laue-Langevin, BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France
| | - K Yamamura
- Research Center for Ultra-Precision Science and Technology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - M Nagano
- Research Center for Ultra-Precision Science and Technology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - T Sanuki
- Department of Physics, Graduate School of Science, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - S Kawasaki
- High Energy Accelerator Research Organization, Institute of Particle and Nuclear Studies, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
| | - M Hino
- Kyoto University Research Reactor Institute, 2, Asahiro-Nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
| | - M Kitaguchi
- Department of Physics, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
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Gomi D, Koyama T, Fukaya M, Yanagihara T, Yukawa H, Nakamura Y, Nagano M, Ozaki Y, Kawana H, Oyama Y. FDG-PET Scan and Serum NSE in Early Response to Sirolimus in Malignant Perivascular Epithelioid Cell Tumor (PEComa). Ann Oncol 2013. [DOI: 10.1093/annonc/mdt460.35] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Nagano M, Matsuo E, Moriyama Y, Nofuji Y, Kumagai S. Association between physical activity and duplication of cognitive decline, depressive symptom and homebound in community-dwelling Japanese elderly: The Dazaifu Study. J Sci Med Sport 2012. [DOI: 10.1016/j.jsams.2012.11.056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Nagano M, Böhmdorfer B, Sommeregger U, Janowitz S, Frühwald T. Attention: Anticholinergic. Eur Geriatr Med 2012. [DOI: 10.1016/j.eurger.2012.07.277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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23
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Ishikawa T, Watanabe N, Nagano M, Kawai-Yamada M, Lam E. Bax inhibitor-1: a highly conserved endoplasmic reticulum-resident cell death suppressor. Cell Death Differ 2011; 18:1271-8. [PMID: 21597463 DOI: 10.1038/cdd.2011.59] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
In spite of fundamental differences between plant and animal cells, it is remarkable that some cell death regulators that were identified to control cell death in metazoans can also function in plants. The fact that most of these proteins do not have structural homologs in plant genomes suggests that they may be targeting a highly conserved 'core' mechanism with conserved functions that is present in all eukaryotes. The ubiquitous Bax inhibitor-1 (BI-1) is a common cell death suppressor in eukaryotes that has provided a potential portal to this cell death core. In this review, we will update the current status of our understanding on the function and activities of this intriguing protein. Genetic, molecular and biochemical studies have so far suggested a consistent view that BI-1 is an endoplasmic reticulum (ER)-resident transmembrane protein that can interact with multiple partners to alter intracellular Ca(2+) flux control and lipid dynamics. Functionally, the level of BI-1 protein has been hypothesized to have the role of a rheostat to regulate the threshold of ER-stress inducible cell death. Further, delineation of the cell death suppression mechanism by BI-1 should shed light on an ancient cell death core-control pathway in eukaryotes, as well as novel ways to improve stress tolerance.
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Affiliation(s)
- T Ishikawa
- Department of Environmental Science and Technology, Saitama University, Saitama 338-8570, Japan
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Gonçalves LHR, Veríssimo P, Timenetsky K, Figueiredo T, Yang A, Andre T, Nagano M, Alexandre C, Goedert A, Caserta R, Silva E. Respiratory muscle weakness in acute heart failure patients. Crit Care 2011. [PMCID: PMC3124174 DOI: 10.1186/cc10172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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25
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Svingen T, McClelland K, Masumoto K, Sujino M, Nagano M, Shigeyoshi Y, Koopman P. Prokr2-Deficient Mice Display Vascular Dysmorphology of the Fetal Testes: Potential Implications for Kallmann Syndrome Aetiology. Sex Dev 2011; 5:294-303. [DOI: 10.1159/000335160] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/27/2011] [Indexed: 11/19/2022] Open
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Nagano M, Takai H, Yamazaki D, Maruyama R, Soyama K, Yamamura K. Fabrication of plano-elliptical neutron focusing supermirror by numerically controlled local wet etching with ion beam sputter deposition. ACTA ACUST UNITED AC 2010. [DOI: 10.1088/1742-6596/251/1/012077] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Abstract
Inflammatory skin disorder aggravates when a horrific memory is evoked, but the mechanism of this effect is unclear. The objective of the present study was to examine the effects of evocation of a horrific memory on the skin and mast cells in an animal model. A sound stimulus linked to an electric shock was given to C57BL/6 mice (7-week old, males). One, 3 and 5 days later, the mice received the sound stimulus again. The reactions of mice that received the initial sound stimulus were compared with those of mice that did not receive the initial stimulus. A freezing phenomenon was observed when the sound stimulus was given to mice that received the initial stimulus, which indicated evocation of a past memory of fear. The degranulation rate of dermal mast cells and the length of substance P (SP)-positive nerve fibers of the skin significantly increased on days 1 and 3, the SP level decreased significantly, and the number of SP-expressing cells in the dorsal root ganglion significantly increased on day 1. These findings suggest that prior experience of severe stress linked to a stimulus subsequently evokes fear associated with the same stimulus and results in activation of dermal mast cells and skin nerves.
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Affiliation(s)
- Masayo Kumagai
- Departments of Dermatology, Nippon Medical School, Tokyo, Japan
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Takagi A, Nagano M, Iwanaga T, Ito N, Hattori H, Egashira T, Ikeda Y. P231 IDENTIFICATION OF COMPOUND HETEROZYGOUS DEFICIENCY WITH A NOVEL LARGE DELETION AND Y61X OF THE LIPOPROTEIN LIPASE GENE IN JAPANESE SUBJECT. ATHEROSCLEROSIS SUPP 2010. [DOI: 10.1016/s1567-5688(10)70298-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Shah S, Nagano M, Yamashita Y, Hishinuma M. Microencapsulation of canine sperm and its preservation at 4°C. Theriogenology 2010; 73:560-7. [DOI: 10.1016/j.theriogenology.2009.09.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 09/22/2009] [Accepted: 09/24/2009] [Indexed: 10/20/2022]
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Ito H, Nagano M, Suzuki H, Murakoshi T. Chronic stress enhances synaptic plasticity due to disinhibition in the anterior cingulate cortex and induces hyper-locomotion in mice. Neuropharmacology 2009; 58:746-57. [PMID: 20035774 DOI: 10.1016/j.neuropharm.2009.12.011] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2009] [Revised: 12/08/2009] [Accepted: 12/14/2009] [Indexed: 10/20/2022]
Abstract
The anterior cingulate cortex (ACC) is involved in the pathophysiology of a variety of mental disorders, many of which are exacerbated by stress. There are few studies, however, of stress-induced modification of synaptic function in the ACC that is relevant to emotional behavior. We investigated the effects of chronic restraint stress (CRS) on behavior and synaptic function in layers II/III of the ACC in mice. The duration of field excitatory postsynaptic potentials (fEPSPs) was longer in CRS mice than in control mice. The frequency of miniature inhibitory postsynaptic currents (mIPSCs) recorded by whole-cell patch-clamping was reduced in CRS mice, while miniature excitatory postsynaptic currents (mEPSCs) remained unchanged. Paired-pulse ratios (PPRs) of the fEPSP and evoked EPSC were larger in CRS. There was no difference in NMDA component of evoked EPSCs between the groups. Both long-term potentiation (LTP) and long-term depression of fEPSP were larger in CRS mice than in control mice. The differences between the groups in fEPSP duration, PPRs and LTP level were not observed when the GABA(A) receptor was blocked by bicuculline. Compared to control mice, CRS mice exhibited hyper-locomotive activity in an open field test, while no difference was observed between the groups in anxiety-like behavior in a light/dark choice test. CRS mice displayed decreased freezing behavior in fear conditioning tests compared to control mice. These findings suggest that CRS facilitates synaptic plasticity in the ACC via increased excitability due to disinhibition of GABA(A) receptor signalling, which may underlie induction of behavioral hyper-locomotive activity after CRS.
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Affiliation(s)
- Hiroshi Ito
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
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Mito T, Yoshioka K, Nagano M, Suzuki C, Yamashita S, Hoshi H. Transforming growth factor-α in a defined medium during in vitro maturation of porcine oocytes improves their developmental competence and intracellular ultrastructure. Theriogenology 2009; 72:841-50. [DOI: 10.1016/j.theriogenology.2009.06.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 05/28/2009] [Accepted: 06/03/2009] [Indexed: 11/26/2022]
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33
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Takagi A, Nagano M, Iwanaga T, Ito N, Hattori H, Egashira T, Ikeda Y. Abstract: P1381 IDENTIFICATION OF COMPOUND HETEROZYGOUS DEFICIENCY WITH A NOVEL LARGE DELETION AND Y61X OF THE LIPOPROTEIN LIPASE GENE IN THE JAPANESE SUBJECT. ATHEROSCLEROSIS SUPP 2009. [DOI: 10.1016/s1567-5688(09)71389-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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34
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Ito H, Nagano M, Suzuki H, Murakoshi T. Hyperlocomotion and elevated synaptic plasticity in the anterior cingulate cortex in mice after chronic restraint stress. Neurosci Res 2009. [DOI: 10.1016/j.neures.2009.09.1000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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35
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Ishikawa E, Kato T, Toriumi J, Nagano M, Inoue T, Sugai M, Iwasaki Y, Tsubuku T, Nakamura S, Hayakawa H, Honda S, Watanabe K. Brenner Tumor of the Ovary A Report of Three Cases with Supplementary Histochemical Observations. Pathol Int 2008. [DOI: 10.1111/j.1440-1827.1959.tb02977.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Matsumura T, Sakai A, Nagano M, Sawada M, Suzuki H, Umino M, Suzuki H. Increase in hemokinin-1 mRNA in the spinal cord during the early phase of a neuropathic pain state. Br J Pharmacol 2008; 155:767-74. [PMID: 18660829 PMCID: PMC2584930 DOI: 10.1038/bjp.2008.301] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Revised: 06/10/2008] [Accepted: 06/27/2008] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND AND PURPOSE Substance P (SP), a representative member of the tachykinin family, is involved in nociception under physiological and pathological conditions. Recently, hemokinin-1 (HK-1) was identified as a new member of this family. Although HK-1 acts on NK(1) tachykinin receptors that are thought to be innate for SP, the roles of HK-1 in neuropathic pain are still unknown. EXPERIMENTAL APPROACH Using rats that had been subjected to chronic constrictive injury (CCI) of the sciatic nerve as a neuropathic pain model, we examined the changes in expression of SP- and HK-1-encoding genes (TAC1 and TAC4, respectively) in the L4/L5 spinal cord and L4/L5 dorsal root ganglia (DRGs) in association with changes in pain-related behaviours in this neuropathic pain state. KEY RESULTS The TAC4 mRNA level was increased on the ipsilateral side of the dorsal spinal cord, but not in DRGs, at day 3 after CCI. In contrast, the TAC1 mRNA level was significantly increased in the DRGs at day 3 after CCI without any changes in the dorsal spinal cord. Analysis of a cultured microglial cell line revealed the presence of TAC4 mRNA in microglial cells. Minocycline, an inhibitor of microglial activation, blocked the increased expression of TAC4 mRNA after CCI and inhibited the associated pain-related behaviours and microglial activation in the spinal cord. CONCLUSIONS AND IMPLICATIONS The present results suggest that HK-1 expression is increased at least partly in activated microglial cells after nerve injury and is clearly involved in the early phase of neuropathic pain.
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Affiliation(s)
- T Matsumura
- Anesthesiology and Clinical Physiology, Department of Oral Restitution, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University Bunkyo-ku, Tokyo, Japan
| | - A Sakai
- Department of Pharmacology, Nippon Medical School Bunkyo-ku, Tokyo, Japan
| | - M Nagano
- Department of Pharmacology, Nippon Medical School Bunkyo-ku, Tokyo, Japan
| | - M Sawada
- Department of Brain Function, Research Institute of Environmental Medicine, Nagoya University, Furo-cho Chikusa-ku, Nagoya, Japan
| | - H Suzuki
- Department of Brain Function, Research Institute of Environmental Medicine, Nagoya University, Furo-cho Chikusa-ku, Nagoya, Japan
| | - M Umino
- Anesthesiology and Clinical Physiology, Department of Oral Restitution, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University Bunkyo-ku, Tokyo, Japan
| | - H Suzuki
- Department of Pharmacology, Nippon Medical School Bunkyo-ku, Tokyo, Japan
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Tanaka N, Aoki K, Ishikura S, Nagano M, Imamura Y, Hara A, Nakamura K. Structural basis for peroxisomal localization of tetrameric carbonyl reductase. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308088661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Mannan M, Nagano M, Shigezumi K, Kida T, Hirao N, Baba Y. Characterization of Boron Carbonitride (BCN) Thin Films Deposited by Radiofrequency and Microwave Plasma Enhanced Chemical Vapor Deposition. ACTA ACUST UNITED AC 2008. [DOI: 10.3844/ajassp.2008.736.741] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ikeda Y, Yahata N, Ito I, Nagano M, Toyota T, Yoshikawa T, Okubo Y, Suzuki H. Low serum levels of brain-derived neurotrophic factor and epidermal growth factor in patients with chronic schizophrenia. Schizophr Res 2008; 101:58-66. [PMID: 18289832 DOI: 10.1016/j.schres.2008.01.017] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2007] [Revised: 01/07/2008] [Accepted: 01/16/2008] [Indexed: 12/22/2022]
Abstract
Neurotrophic factors (NFs) play a pivotal role in the development of the central nervous system. They are thus also suspected of being involved in the etiology of schizophrenia. Previous studies reported a decreased level of serum brain-derived neurotrophic factor (BDNF) in schizophrenia, whereas the association of epidermal growth factor (EGF) with this illness remains controversial. Using a two-site enzyme immunoassay, we conducted the simultaneous measurement of serum BDNF and EGF levels in a group of patients with chronic schizophrenia (N=74) and a group of normal controls matched in age, body mass index, smoking habit and sex (N=87). We found that, compared to normal controls, patients with chronic schizophrenia exhibited lower serum levels of both BDNF and EGF across all ages examined (21-59 years). The serum levels of BDNF and EGF were negatively correlated in the controls (r=-0.387, P=0.0002) but not in the patients. Clinical parameters such as duration of illness and psychiatric rating scale also showed no robust correlations with the NF levels. Collectively, these results suggest that pervasive, abnormal signaling of NFs underlies the pathophysiology of chronic schizophrenia.
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Affiliation(s)
- Yumiko Ikeda
- Department of Pharmacology, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan.
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Nagano M, Nakaoka Y, Ohgaki A, Fukuda A, Morimoto Y. RG-002 Selection criteria of the blastomere size for preimplantation genetic diagnosis to improve FISH analysis. Reprod Biomed Online 2008. [DOI: 10.1016/s1472-6483(10)61577-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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41
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Ebisuzaki T, Uehara Y, Ohmori H, Kawai K, Kawasaki Y, Sato M, Takizawa Y, Bertaina M, Kajino F, Sawabe T, Inoue K, Sasaki A, Sakata M, Yamamoto Y, Nagano M, Inoue N, Shibata T, Sakaki N, Uchihori Y, Takahashi Y, Shimizu H, Arai Y, Kurihara Y, Fujimoto H, Yoshida S, Mizumoto Y, Inoue S, Asano K, Sugiyama T, Watanabe J, Ikeda H, Suzuki M, Imamura T, Yano H, Murakami T, Yonetoku D, Itow Y, Taguchi M, Nagata M, Nagataki S, Abe S, Tajima T, Adams J, Mitchell S, Christl M, Watts J, English A, Takahashi Y, Pitalo K, Hadaway J, Geary J, Readon P, Crawford H, Pennypacker C, Arisaka K, Cline D, Gorodetsky P, Salin P, Patzark T, Maurissen A, Valentin M. The JEM-EUSO Project: Observing Extremely High Energy Cosmic Rays and Neutrinos from the International Space Station. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.nuclphysbps.2007.11.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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42
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Nagano M, Uchikura K, Takahashi Y, Hishinuma M. Effect of duration of in vitro maturation on nuclear maturation and fertilizability of feline oocytes. Theriogenology 2007; 69:231-6. [PMID: 18029000 DOI: 10.1016/j.theriogenology.2007.09.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2007] [Revised: 09/04/2007] [Accepted: 09/18/2007] [Indexed: 11/26/2022]
Abstract
This study was conducted to improve in vitro production of embryos from domestic cats using TCM-199 as an IVM medium. The time sequence of nuclear maturation and the optimal timing of in vitro insemination were examined. Most oocytes were at the germinal vesicle stage immediately after collection; however, 8.3% had already resumed meiosis before IVM culture. After 30 h of IVM culture, the percentage of oocytes at metaphase II (MII) reached a peak (75.5%) and did not change (P>0.05) from 30 to 48 h after IVM culture. The percentage of oocytes with two pronuclei was higher (P<0.05) for oocytes matured for 30 and 36 h (38.2 and 33.0%, respectively) than for those after IVM culture for only 24 h (18.5%). Total sperm penetration rate was highest (P<0.05) for oocytes that had been matured for 30 h (46.1%). After 30 h of IVM and 18 h of IVF culture, 66.3 and 24.8% of inseminated oocytes had cleaved and developed to the blastocyst stage, respectively. We concluded that IVM of feline oocytes for 30 h in TCM-199 resulted in optimal nuclear maturation and sperm penetration.
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Affiliation(s)
- M Nagano
- Department of Theriogenology, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, Tottori, Japan.
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Tsukino H, Katoht T, Hamasuna R, Nose K, Inoue K, Nagano M, Wakeda H, Kamimura T, Hasui Y, Osada Y. MP-04.04: Glutathione S-transferase (GST) M1, T1 and N-acetyltransferase 2 (NAT2) polymorphisms and urothelial cancer risk with tobacco smoking. Urology 2007. [DOI: 10.1016/j.urology.2007.06.230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Wakeda H, Hasui Y, Tshukino H, Yakushiji K, Kamimura T, Nagano M, Inoue K, Nose K, Hamasuna R, Osada Y. POS-02.26: Combined intra-arterial chemotherapy and radiotherapy for invasive bladder carcinoma. Urology 2007. [DOI: 10.1016/j.urology.2007.06.766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nagano M, Kamimura T, Tsukino H, Wakeda H, Inoue K, Kobayashi T, Yamashita Y, Hamasuna R, Hasui Y, Osada Y. POS-03.06: Retroperitoneal laparoscopic nephrouretectomy for urothelial carcinoma of the renal pelvis and ureter. Urology 2007. [DOI: 10.1016/j.urology.2007.06.994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Zhou Z, Kawana S, Aoki E, Katayama M, Nagano M, Suzuki H. Dynamic changes in nerve growth factor and substance P in the murine hair cycle induced by depilation. J Dermatol 2007; 33:833-41. [PMID: 17169085 DOI: 10.1111/j.1346-8138.2006.00191.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Increasing evidence suggests that various neurotrophins and neuropeptides play an important role in the progression of hair follicle cycling. Among them, nerve growth factor (NGF) and substance P (SP) have attracted special interest recently. However, the interaction between these factors during hair cycling has not yet been systematically studied. We therefore investigated the mutual relationships between NGF and SP and the mechanism by which the anagen stage of the hair cycle is initiated. Fluctuations in numbers of SP-positive nerve fibers and variations in amounts of SP, NGF, and another neurotrophic factor, glial cell-derived neurotrophic factor, in skin in the C57BL/6 mouse depilation-induced hair cycle model, together with the spatiotemporal expression patterns of each of these factors, were followed simultaneously by enzyme-linked immunosorbent assay and immunohistochemistry. The main finding was that a surge in NGF expression and a rapid increase in NGF content in skin is an initial event within 1 day after depilation, followed by elevation of SP content and numbers of SP-containing fibers 2 days after the increase in NGF. Our findings suggest that a rapid and abundant increase in NGF plays a key role in the induction and progression of anagen hair cycling through keratinocyte growth promotion. NGF may also induce plastic changes such as sprouting and hyperplasia in dermal nerve fibers and enhance their SP production. Elevated levels of SP in skin may additionally contribute to the progression of consecutive anagen hair cycles.
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Affiliation(s)
- Zhanchao Zhou
- Department of Dermatology, Nippon Medical School, Bunkyo-Ku, Tokyo, Japan
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Nagano M, Saitow F, Haneda E, Konishi S, Hayashi M, Suzuki H. Distribution and pharmacological characterization of primate NK-1 and NK-3 tachykinin receptors in the central nervous system of the rhesus monkey. Br J Pharmacol 2006; 147:316-23. [PMID: 16331282 PMCID: PMC1751306 DOI: 10.1038/sj.bjp.0706561] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Much attention has focused on tachykinin receptors as therapeutic targets for neuropsychiatric disorders, although their expressional distributions in the primate central nervous system (CNS) remain unclear. We cloned the genes encoding the NK-1 and NK-3 tachykinin receptors (referred to as rmNK-1 and rmNK-3) from the rhesus monkey (Macaca mulatta) brain and examined their pharmacological profiles and regional distributions in the CNS. The deduced rmNK-1 amino-acid sequence differed by only two amino acids from the human NK-1 (hNK-1). The deduced rmNK-3 amino-acid sequence was two amino acids shorter than human NK-3 (hNK-3), with a seven-amino-acid difference in sequence. Ligand binding studies revealed that the affinity of rmNK-1 to substance P (SP) was comparable to that of hNK-1 in cell lines that expressed individual receptors stably. Nonpeptide antagonists had similar effects on the binding of rmNK-1 and hNK-1. Affinity of rmNK-3 for NKB was stronger than for SP and the IC50 value was comparable with that of hNK-3. Ca2+ imaging showed that activations of both rmNK-1 and rmNK-3 by specific ligands, SP and senktide, induced increased intracellular Ca2+ in cell lines that stably expressed individual primate tachykinin receptors. The amounts of rmNK-1 and rmNK-3 mRNAs were quantitatively determined in the monkey CNS. The expression of rmNK-1 was observed in all of the cortical and subcortical regions, including the hippocampus and the amygdala. The putamen contained the most NK-1 mRNA in the brain, with less rmNK-3 mRNA found in the cortex compared to rmNK-1 mRNA. In the monkey hippocampus and amygdala, rmNK-1 mRNA was present at markedly higher concentrations than rmNK-3 mRNA. The present results provide an insight into the distinct physiological nature and significance of the NK-1 and NK-3 tachykinin systems in the primate CNS. These findings are indispensable for establishing model systems in the search for a subtype-specific tachykinin receptor agonist and antagonist for the treatment of neuropsychiatric disorders.
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Affiliation(s)
- Masatoshi Nagano
- Department of Pharmacology, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan
| | - Fumihito Saitow
- Department of Pharmacology, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan
| | - Eisuke Haneda
- Department of Pharmacology, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan
| | - Shiro Konishi
- Waseda-Olympus Bioscience Research Institute, Waseda University, Singapore 138667, Singapore
| | - Motoharu Hayashi
- Department of Cellular and Molecular Biology, Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
| | - Hidenori Suzuki
- Department of Pharmacology, Nippon Medical School, 1-1-5, Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan
- Author for correspondence:
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Nomura H, Sakai A, Nagano M, Umino M, Suzuki H. Expression changes of cation chloride cotransporters in the rat spinal cord following intraplantar formalin. Neurosci Res 2006; 56:435-40. [PMID: 17007947 DOI: 10.1016/j.neures.2006.08.012] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2006] [Revised: 08/18/2006] [Accepted: 08/25/2006] [Indexed: 11/25/2022]
Abstract
Cation chloride cotransporters, K(+)-Cl(-) cotransporter 2 (KCC2) and Na(+)-K(+)-Cl(-) cotransporter 1 (NKCC1) are reported to be expressed in the neurons in the spinal cord and regulate intracellular Cl(-) concentration. Evidence has been accumulating that the expression of cation chloride cotransporters changes in inflammatory or neuropathic pain, and such changes take a part in pathophysiology of the persistent pain states. However, it is largely unknown how these cotransporters contribute to hyperalgesia in the acute pain state. We, therefore, investigated expression changes of KCC2 and NKCC1 in the spinal dorsal horn of the rat after the intraplantar injection of formalin as an acute nociceptive stimulus. The rats showed two phases (phases 1 and 2) of increase in pain-related behavior in response to formalin. We found that expression of KCC2-like immunoreactivity (IR) was reduced in lamina I and II in the lumbar spinal cord on the stimulated side in phase 1, and then recovered gradually. In contrast, the number of NKCC1-like IR-positive cells was unchanged over the period examined. These results suggest that KCC2, rather than NKCC1, mainly contributes to modulating excitability of the dorsal spinal cord neurons in the initial stage of formalin-evoked hyperalgesia.
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Affiliation(s)
- Hidehiko Nomura
- Anesthesiology and Clinical Physiology, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Tokyo, Japan
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Kawana S, Liang Z, Nagano M, Suzuki H. Role of substance P in stress-derived degranulation of dermal mast cells in mice. J Dermatol Sci 2006; 42:47-54. [PMID: 16412613 DOI: 10.1016/j.jdermsci.2005.12.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2005] [Revised: 12/03/2005] [Accepted: 12/06/2005] [Indexed: 10/25/2022]
Abstract
BACKGROUND The interaction between nerves and mast cells can effect regulation of the immune system and inflammatory responses. Recent studies have shown that various stressors can induce degranulation of dermal mast cells in animals. OBJECTIVES This study was conducted to confirm that substance P (SP) was involved in the degranulation of dermal mast cells in stress conditions. METHODS Using a communication box system, foot shock stress (FS) and psychological stress (PS) were administered to mice and the degranulation rate of dermal mast cells, the number of SP-positive nerve fibers and changes in SP content were determined. The inhibitory effect of a non-peptide NK1-receptor antagonist on these changes was investigated. RESULTS Both FS and PS significantly enhanced the degranulation of dermal mast cells and increased the number of SP-positive nerve fibers. FS significantly decreased dermal SP content whereas SP was increased by PS. These changes were inhibited by intraperitoneal injection of NK(1) receptor antagonist. CONCLUSIONS It was considered that SP released from the nerve ending, had an important role in the degranulation of dermal mast cells. Results of this study suggest that the tachykinin receptor antagonist exhibited an inhibitory effect on aggravated stress-induced dermatitis.
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Affiliation(s)
- Seiji Kawana
- Nippon Medical School, Department of Dermatology, 1-1-5 Sendagi, 113-8603 Tokyo, Japan.
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Tanaka F, Sato K, Nagano M, Segawa T, Nakamura M. Mo-P1:100 High LDL and low HDL levels are important factors increasing pulse wave velocity in the general population. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)80235-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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