Biomedical Research-tokyo最新文献_第6页

Meis1 plays roles in cortical development through regulation of cellular proliferative capacity in the embryonic cerebrum. Meis1通过调控胚胎大脑的细胞增殖能力在皮质发育中发挥作用。

IF 1.2 4区医学

Biomedical Research-tokyo Pub Date : 2022-01-01 DOI: 10.2220/biomedres.43.91

Eriko Isogai, Kazuhiro Okumura, Megumi Saito, Yurika Tokunaga, Yuichi Wakabayashi

{"title":"Meis1 plays roles in cortical development through regulation of cellular proliferative capacity in the embryonic cerebrum.","authors":"Eriko Isogai, Kazuhiro Okumura, Megumi Saito, Yurika Tokunaga, Yuichi Wakabayashi","doi":"10.2220/biomedres.43.91","DOIUrl":"https://doi.org/10.2220/biomedres.43.91","url":null,"abstract":"Meis1 (myeloid ecotropic insertion site 1) is known to be related to embryonic development and cancer. In this study, to analyze the function of Meis1 in neural stem cells, we crossed Meis1fl/fl (Meis1 floxed) mice with Nestin-Cre mice. The results showed that Meis1-conditional knockout mice showed cerebral cortex malformation. The mice had a significantly thinner cortex than wildtype mice. At E14.5, BrdU incorporation and Pax6-positive radial glial cells were significantly decreased in the cerebral cortex of Meis1 knockout embryos as compared with wild-type embryos, whereas Tbr2-positive intermediate progenitors and NeuN-positive differentiated neurons were not. Cell death detected by immunostaining with cleaved caspase3 antibody showed no difference in the cortex between knockout and wild-type embryos. Furthermore, knockout of Meis1 in embryo by in utero electroporation showed that cellular migration was disturbed during cortical development. Therefore, Meis1 could play important roles during cortical development through the regulation of cell proliferation and migration in the embryonic cerebral cortex.","PeriodicalId":9138,"journal":{"name":"Biomedical Research-tokyo","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39998565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Early reperfusion with hemoglobin vesicles into tracheal subepithelial capillaries in a mouse tracheal transplant model. 小鼠气管移植模型气管上皮下毛细血管早期再灌注血红蛋白囊泡。

IF 1.2 4区医学

Biomedical Research-tokyo Pub Date : 2022-01-01 DOI: 10.2220/biomedres.43.137

Hiroto Onozawa, Mitsutomo Kohno, Ryo Hashimoto, Kana Oiwa, Ryota Masuda, Masatoshi Yamaguchi, Tai Hato, Masazumi Watanabe, Hirohisa Horinouchi, Hiromi Sakai, Koichi Kobayashi, Masayuki Iwazaki

{"title":"Early reperfusion with hemoglobin vesicles into tracheal subepithelial capillaries in a mouse tracheal transplant model.","authors":"Hiroto Onozawa, Mitsutomo Kohno, Ryo Hashimoto, Kana Oiwa, Ryota Masuda, Masatoshi Yamaguchi, Tai Hato, Masazumi Watanabe, Hirohisa Horinouchi, Hiromi Sakai, Koichi Kobayashi, Masayuki Iwazaki","doi":"10.2220/biomedres.43.137","DOIUrl":"https://doi.org/10.2220/biomedres.43.137","url":null,"abstract":"Hemoglobin vesicles (HbVs), liposomes containing concentrated hemoglobin extracted from outdated human red blood cells (RBC), are artificial oxygen carriers with a small particle size. To evaluate the reperfusion of capillaries with HbVs in a tracheal transplant model and compare it with that of RBC. Isogenic mice were used as donors and recipients in a parallel trachea transplant model. Both ends of the donor trachea were anastomosed end-laterally to the recipient trachea to form in parallel. After transplantation, 0.3 mL of HbV solution (Hb concentration, 10 g/dL) was administered via the tail vein. The recipients were euthanized 1, 4, 6, and 8 h after surgery (n = 5 in each group). The tracheas were harvested, and tracheal subepithelial capillaries (SEC) reperfusion was histologically evaluated. A significant number of particles defined as HbV by electron microscopy were observed in the SEC of the grafted tracheas 4 h after the transplant surgery and HbV administration when no RBC were found in the SECs. The number increased 6 and 8 h later. Our findings suggest that HbVs, which are smaller than RBC, can reperfuse the capillaries of grafts earlier than RBCs after transplantation and contribute to the oxygenation of transplanted tissues.","PeriodicalId":9138,"journal":{"name":"Biomedical Research-tokyo","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40429936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

IF 1.2 4区医学

Biomedical Research-tokyo Pub Date : 2022-01-01 DOI: 10.2220/biomedres.43.11

Masatoshi Sato, Keisuke Morita, Rie Azumi, Yusuke Mizutani, Manabu Hayatsu, Tatsuo Ushiki, Shuji Terai

{"title":"Diet-related changes of basal lamina fenestrations in the villous epithelium of the rat small intestine: Statistical analysis on scanning electron microscopy.","authors":"Masatoshi Sato, Keisuke Morita, Rie Azumi, Yusuke Mizutani, Manabu Hayatsu, Tatsuo Ushiki, Shuji Terai","doi":"10.2220/biomedres.43.11","DOIUrl":"https://doi.org/10.2220/biomedres.43.11","url":null,"abstract":"The epithelial basal lamina of the small intestine has numerous fenestrations for intraepithelial migration of leukocytes. We have reported dynamic changes of fenestrations in dietary conditions. To investigate this phenomenon, we performed statistical analyses using scanning electron microscopy images of the epithelial basal lamina of rat intestinal villi after removal of the villous epithelium by osmium maceration. We examined structural changes in the number and size of fenestrations in the rat jejunum and ileum under fasted and fed states for 24 h. Our findings revealed that, in the jejunum, the number of free cells migrating into the epithelium through fenestrations increased from 2 h after feeding, resulting in an increase in the fenestration size of intestinal villi; the number of free cells then tended to decrease at 6 h after feeding, and the fenestration size also gradually decreased. By contrast, the increase in the fenestration size by feeding was not statistically significant in the ileum. These findings indicate that the number of migrating cells increases in the upper part of the small intestine under dietary conditions, which may influence the absorption efficiency of nutrients including lipids, as well as the induction of nutrient-induced inflammation.","PeriodicalId":9138,"journal":{"name":"Biomedical Research-tokyo","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39930231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structure and barrier functions of the perineurium and its relationship with associated sensory corpuscles: A review. 神经周围膜的结构和屏障功能及其与相关感觉小体的关系综述。

IF 1.2 4区医学

Biomedical Research-tokyo Pub Date : 2022-01-01 DOI: 10.2220/biomedres.43.145

Toshihiko Iwanaga, Hiromi Takahashi-Iwanaga, Junko Nio-Kobayashi, Satomi Ebara

{"title":"Structure and barrier functions of the perineurium and its relationship with associated sensory corpuscles: A review.","authors":"Toshihiko Iwanaga, Hiromi Takahashi-Iwanaga, Junko Nio-Kobayashi, Satomi Ebara","doi":"10.2220/biomedres.43.145","DOIUrl":"https://doi.org/10.2220/biomedres.43.145","url":null,"abstract":"Peripheral nerves are provided with a blood-nerve barrier which prevents the invasion of harmful substances and pathogens, and also regulates metabolic and ionic homeostasis within nerve fascicles. The barrier functions are attributed to both the concentric layer of flattened cells in the perineurium and blood vessels running in the endoneurium. The perineurial cells develop continuous tight junctions as a diffusion barrier. In order to take up a predominant nutrient, glucose, the perineurium as well as endoneurial capillaries expresses GLUT1, a glucose transporter. An axon-Schwann cell complex within peripheral nerves utilizes glucose as a major energy source via the GLUT1, as does the brain. Under conditions of a reduced utilization of glucose, only the perineurial cells can transfer other nutrients, namely monocarboxylates such as ketone bodies and lactate via MCT1. Thus, MCT1 colocalizes with GLUT1 in the perineurium but not in endoneurial capillaries. To identify the cellular origins of the nerve sheath, marker proteins such as glial specific S100 protein, GLUT1, endoneurial CD34, and EMA (epithelial membrane antigen) are useful. Immunohistochemical findings for these markers are reviewed in this paper, focusing on the perineurium and endoneurium and their derivatives, Pacinian and Meissner corpuscles. Growing evidence throws light on the critical involvement of the nerve sheaths in the development, maintenance, and diseases of peripheral nerves.","PeriodicalId":9138,"journal":{"name":"Biomedical Research-tokyo","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33512963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Novel cell-based system to assay cell-cell fusion during myotube formation. 新的基于细胞的系统来测定肌管形成过程中的细胞-细胞融合。

IF 1.2 4区医学

Biomedical Research-tokyo Pub Date : 2022-01-01 DOI: 10.2220/biomedres.43.107

Mari Isobe, Yumika Suzuki, Hideshi Sugiura, Masahiro Shibata, Yuki Ohsaki, Satoshi Kametaka

{"title":"Novel cell-based system to assay cell-cell fusion during myotube formation.","authors":"Mari Isobe, Yumika Suzuki, Hideshi Sugiura, Masahiro Shibata, Yuki Ohsaki, Satoshi Kametaka","doi":"10.2220/biomedres.43.107","DOIUrl":"https://doi.org/10.2220/biomedres.43.107","url":null,"abstract":"A live assay tool has been established to uncover the precise molecular mechanisms underlying complex cell fusion events in myoblasts. The novel cell-based assay, HiMy (HiBiT-based myoblast fusion), utilizes a recently developed split-luciferase technology. The assay successfully detected cell fusion in differentiating C2C12 myoblast cultures. This allowed us to measure mixing of the cytoplasm, which occurred several hours after the initiation of C2C12 differentiation. Unlike what was reported earlier, the fusion was detected a few hours after the initiation of differentiation. Thus, this assay is sensitive enough to monitor fusion events before they become detectable using conventional methods. Furthermore, a panel of laboratory compounds, including a variety of inhibitors of cellular enzymes or activities, were assayed using the HiMy assay. Lovastatin, a cholesterol biogenesis inhibitor, decreased HiMy activity by approximately 50%. In contrast, mevalonolactone, a precursor for cholesterol synthesis, increased fusion activity. These results confirmed the previous finding that the amount of cellular cholesterol positively correlates with the rate of myoblast fusion during myogenesis. These results indicate that the novel cell fusion assay is a quick, accurate, and robust method to monitor intercellular fusion events.","PeriodicalId":9138,"journal":{"name":"Biomedical Research-tokyo","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40429934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Secondary bile acid lithocholic acid attenuates neurally evoked ion transport in the rat distal colon. 继发性胆汁酸胆酸减弱大鼠远端结肠神经诱导离子转运。

IF 1.2 4区医学

Biomedical Research-tokyo Pub Date : 2022-01-01 DOI: 10.2220/biomedres.43.223

Kohei Takahashi, Yuko Kuwahara, Ikuo Kato, Shinji Asano, Takaharu Kozakai, Yoshinori Marunaka, Atsukazu Kuwahara

{"title":"Secondary bile acid lithocholic acid attenuates neurally evoked ion transport in the rat distal colon.","authors":"Kohei Takahashi, Yuko Kuwahara, Ikuo Kato, Shinji Asano, Takaharu Kozakai, Yoshinori Marunaka, Atsukazu Kuwahara","doi":"10.2220/biomedres.43.223","DOIUrl":"https://doi.org/10.2220/biomedres.43.223","url":null,"abstract":"The inhibitory action of the secondary bile acid lithocholic acid (LCA) on neurally evoked Cl-/HCO3- secretion was investigated using the Ussing-chambered mucosal-submucosal preparation from the rat distal colon. Electrical field stimulation (EFS) evoked cholinergic and noncholinergic secretory responses in the rat distal colon. The responses were almost completely blocked by TTX (10-6 M) but not atropine (10-5 M) or hexamethonium (10-4 M). The selective antagonist for VIP receptor 1 (VPAC1) greatly reduced the EFS-evoked response. Thus, the rat distal colon may be predominantly innervated by noncholinergic VIP secretomotor neurons. Basolateral addition of 6 × 10-5 M LCA inhibited the EFS-evoked response. The inhibitory action of LCA was partly rescued by the Y2R antagonist BIIE0246. The bile acid receptor TGR5 agonist INT-777 mimicked the LCA-induced inhibitory action. Immunohistochemical staining showed the colocalization of TGR5 and PYY on L cells. TGR5 immunoreactivity was also found in VIP-immunoreactive submucosal neurons which also expressed the PYY receptor, Y2R. These results suggest that LCA inhibits neurally evoked Cl-/HCO3- secretion through the activation of TGR5 on L cells and cholinergic- and VIP-secretomotor neurons in the submucosal plexus. Furthermore, the inhibitory mechanism may involve TGR5-stimulated PYY release from L cells and Y2R activation in VIP-secretomotor neurons.","PeriodicalId":9138,"journal":{"name":"Biomedical Research-tokyo","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10355112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Selective estrogen receptor modulators, acting as agonists of estrogen receptor α in osteoblasts, reduce the TGF-β-induced synthesis of macrophage colony-stimulating factor via inhibition of JNK signaling pathway. 选择性雌激素受体调节剂作为成骨细胞雌激素受体α的激动剂，通过抑制JNK信号通路，减少TGF-β诱导巨噬细胞集落刺激因子的合成。

IF 1.2 4区医学

Biomedical Research-tokyo Pub Date : 2022-01-01 DOI: 10.2220/biomedres.43.211

Tomoyuki Hioki, Rie Matsusima-Nishiwaki, Haruhiko Tokuda, Osamu Kozawa

{"title":"Selective estrogen receptor modulators, acting as agonists of estrogen receptor α in osteoblasts, reduce the TGF-β-induced synthesis of macrophage colony-stimulating factor via inhibition of JNK signaling pathway.","authors":"Tomoyuki Hioki, Rie Matsusima-Nishiwaki, Haruhiko Tokuda, Osamu Kozawa","doi":"10.2220/biomedres.43.211","DOIUrl":"https://doi.org/10.2220/biomedres.43.211","url":null,"abstract":"Selective estrogen receptor modulator (SERM) binds to estrogen receptors (ERs) and acts as both an agonist or an antagonist, depending on the target tissue. Raloxifene and bazedoxifene as SERMs are currently used hormone replacement medicines for postmenopausal osteoporosis. Macrophage colony-stimulating factor (M-CSF) secreted from osteoblasts promotes osteoclastogenesis. We have previously demonstrated that transforming growth factor (TGF)-β induces the synthesis of M-CSF via SMAD2/3, p38 mitogen-activated protein kinase (MAPK), p44/p42 MAPK and c-Jun N-terminal kinase (JNK) in osteoblast-like MC3T3-E1 cells. In the present study, we investigated whether SERM affects the M-CSF synthesis by TGF-β in MC3T3-E1 cells. Raloxifene and bazedoxifene significantly suppressed the synthesis of M-CSF. PPT, an ERα agonist, but not ERB041, an ERβ agonist, inhibited the release of M-CSF. MPP, an ERα antagonist, reversed the suppression by raloxifene of the M-CSF release. Raloxifene attenuated the TGF-β-induced phosphorylation of JNK but not SMAD3, p42 MAPK and p38 MAPK. Bazedoxifene and PPT also inhibited the phosphorylation of JNK. Furthermore, MPP, an ERα antagonist, reversed the suppression by both raloxifene and bazedoxifene of the phosphorylation of JNK. Our results strongly indicate that raloxifene and bazedoxifene, SERMs, suppress the TGF-β-induced synthesis of M-CSF through ERα-mediated inhibition of JNK pathway in osteoblasts.","PeriodicalId":9138,"journal":{"name":"Biomedical Research-tokyo","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10427662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

CD44 as a pathological marker for the early detection of calcineurin inhibitor-induced nephrotoxicity post kidney transplantation. CD44作为早期检测肾移植后钙调磷酸酶抑制剂引起的肾毒性的病理标志物。

IF 1.2 4区医学

Biomedical Research-tokyo Pub Date : 2022-01-01 DOI: 10.2220/biomedres.43.181

Asako Hayashi, Takayuki Okamoto, Junko Nio-Kobayashi, Naoya Iwahara, Ryota Suzuki, Yasuhiro Ueda, Toshiyuki Takahashi, Yasuyuki Sato, Toshihiko Iwanaga, Kiyohiko Hotta

{"title":"CD44 as a pathological marker for the early detection of calcineurin inhibitor-induced nephrotoxicity post kidney transplantation.","authors":"Asako Hayashi, Takayuki Okamoto, Junko Nio-Kobayashi, Naoya Iwahara, Ryota Suzuki, Yasuhiro Ueda, Toshiyuki Takahashi, Yasuyuki Sato, Toshihiko Iwanaga, Kiyohiko Hotta","doi":"10.2220/biomedres.43.181","DOIUrl":"https://doi.org/10.2220/biomedres.43.181","url":null,"abstract":"Long-term calcineurin inhibitor (CNI) administration causes irreversible nephrotoxicity. Therefore, early CNI-induced nephrotoxicity detection is necessary for patients who will need long-term CNI administration. There is no pathological indicator for early CNI-induced nephrotoxicity. Here, serial protocol kidney biopsy specimens from five kidney-transplant patients with severe CNI-induced nephrotoxicity were examined. We observed that the increase in CD44 expression in glomerular parietal epithelial cells (PECs) preceded the chronic pathological changes of CNI-induced nephrotoxicity such as tubular atrophy/interstitial fibrosis, arterial hyaline thickening, and focal segmental glomerulosclerosis (FSGS). This result suggests that CD44-positive PECs have pivotal roles in FSGS development in human CNI-induced nephrotoxicity as well as rodent models. CD44 could be useful as a pathological marker for early CNI-induced nephrotoxicity detection post kidney transplantation.","PeriodicalId":9138,"journal":{"name":"Biomedical Research-tokyo","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33512931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Disposal of intestinal apoptotic epithelial cells and their fate via divergent routes. 肠上皮细胞凋亡的处理及其不同途径的命运。

IF 1.2 4区医学

Biomedical Research-tokyo Pub Date : 2022-01-01 DOI: 10.2220/biomedres.43.59

Toshihiko Iwanaga, Hiromi Takahashi-Iwanaga

{"title":"Disposal of intestinal apoptotic epithelial cells and their fate via divergent routes.","authors":"Toshihiko Iwanaga, Hiromi Takahashi-Iwanaga","doi":"10.2220/biomedres.43.59","DOIUrl":"https://doi.org/10.2220/biomedres.43.59","url":null,"abstract":"Gut epithelial cells are characterized by rapid, constant cell renewal. The disposal of aging epithelial cells around the villus tips of the small intestine occurs so regularly that it has been regarded as a consequence of well-controlled cell death, designated as apoptosis. However, the notion of live cell extrusion in the intestine has been intensively built among researchers, and the disposal processes of effete epithelial cells display species and regional differences. Chemical mediators and mechanical forces rising from surrounding cells contribute to the regulated cell replacement. Cytotoxic intraepithelial lymphocytes and lamina propria macrophages play a leading role in the selection of disposal cells and their extrusion to maintain fully the epithelial homeostasis in tandem with the dynamic reconstruction of junctional devices. Lymphocyte-mediated cell killing is predominant in the mouse and rat, while the disposal of epithelial cells in the guinea pig, monkey, and human is characterized by active phagocytosis by subepithelially gathering macrophages. The fenestrated basement membrane formed by immune cells supports their involvement and explains species differences in the disposal of epithelial cells. Via these fenestrations, macrophages and dendritic cells can engulf apoptotic epithelial cells and debris and convey substantial information to regional lymph nodes. In this review, we attempt to focus on morphological aspects concerning the apoptosis and disposal process of effete epithelial cells; in vitro or ex vivo analyses using cultured monolayer has become predominant in recent studies concerning the exfoliation of apoptotic enterocytes. Furthermore, we give attention to their species differences, which is controversial but crucial to our understanding.","PeriodicalId":9138,"journal":{"name":"Biomedical Research-tokyo","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39997753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effects of ANP and BNP on the generation of respiratory rhythms in brainstem-spinal cord preparation isolated from newborn rats. ANP和BNP对新生大鼠脑干-脊髓制备体呼吸节律产生的影响。

IF 1.2 4区医学

Biomedical Research-tokyo Pub Date : 2022-01-01 DOI: 10.2220/biomedres.43.127

Shino Katsuki, Shinichiro Ota, Shunya Yoda, Hiroshi Onimaru, Kenji Dohi, Masahiko Izumizaki

{"title":"Effects of ANP and BNP on the generation of respiratory rhythms in brainstem-spinal cord preparation isolated from newborn rats.","authors":"Shino Katsuki, Shinichiro Ota, Shunya Yoda, Hiroshi Onimaru, Kenji Dohi, Masahiko Izumizaki","doi":"10.2220/biomedres.43.127","DOIUrl":"https://doi.org/10.2220/biomedres.43.127","url":null,"abstract":"Natriuretic peptides (NPs) are a family of peptide hormones produced in cardiac muscle cells and consist mainly of three types: atrial NP (ANP), B-type (or brain) NP (BNP), and C-type NP. We herein report the effects of ANP and BNP on central respiratory activity in brainstem-spinal cord preparation isolated from newborn rats. Bath application of these peptides (100 nM) induced a weak transient depression of the respiratory rhythm followed by recovery. Respiratory-related neurons in the rostral ventrolateral medulla showed a tendency for transient hyperpolarization followed by recovery during the application of ANP or BNP. The application of a membrane-permeable cGMP, 8-Br-cGMP (10 or 20 μM), did not induce significant effects on respiratory rhythm, suggesting no involvement of guanylyl cyclase in effects of ANP or BNP. We also examined effects of BNP on respiratory depression induced by the sedative dexmedetomidine, which exerts an inhibitory influence on respiratory rhythm. When pretreated with 50 nM BNP, the inhibitory effect of 100 nM dexmedetomidine was significantly reduced. Our findings suggest that ANP and BNP act as mild excitatory agents with sustained effects on respiratory rhythm after an initial transient depression.","PeriodicalId":9138,"journal":{"name":"Biomedical Research-tokyo","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10442158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0