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  1. Article ; Online: Urinary titin is not an early biomarker of skeletal muscle atrophy induced by muscle denervation in mice.

    Tanihata, Jun / Minamisawa, Susumu

    PloS one

    2023  Volume 18, Issue 8, Page(s) e0289185

    Abstract: Early detection of skeletal muscle atrophy is important to prevent further muscle weakness. However, there are few non-invasive biomarkers for skeletal muscle atrophy. Recent studies have reported that the N-terminal fragment (N-titin) of titin, a giant ... ...

    Abstract Early detection of skeletal muscle atrophy is important to prevent further muscle weakness. However, there are few non-invasive biomarkers for skeletal muscle atrophy. Recent studies have reported that the N-terminal fragment (N-titin) of titin, a giant sarcomeric protein, is detected in the urine of patients with muscle damage. In this study, we hypothesized that urinary N-titin would be a potential early biomarker of skeletal muscle atrophy in mice caused by sciatic nerve denervation. Male mice were randomly divided into control and denervation groups, and urinary N-titin levels were assessed daily for 9 days using an enzyme-linked immunosorbent assay system. Despite reduced titin protein levels in atrophic muscles 10 days after denervation, cleaved N-titin fragments were not increased in the urine of mice with denervation-induced muscle atrophy. Furthermore, we found no uptake of Evans blue dye from the extracellular space into the cytoplasm in atrophic muscles, suggesting that the sarcomeric membrane is intact in those muscles. The present results suggest that cleaved N-titin in the urine is not suitable as an early biomarker of skeletal muscle atrophy.
    MeSH term(s) Mice ; Male ; Animals ; Connectin/metabolism ; Muscle, Skeletal/metabolism ; Muscle Denervation ; Muscular Atrophy/pathology ; Biomarkers/metabolism ; Denervation/adverse effects ; Protein Kinases/metabolism
    Chemical Substances Connectin ; Biomarkers ; titin protein, mouse (EC 2.7.11.1) ; Protein Kinases (EC 2.7.-)
    Language English
    Publishing date 2023-08-15
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0289185
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  2. Article ; Online: Elusive mechanisms responsible for pulmonary hypertension.

    Fujimoto, Yoshitaka / Minamisawa, Susumu

    The Journal of thoracic and cardiovascular surgery

    2017  Volume 155, Issue 1, Page(s) 282

    MeSH term(s) Animals ; Heart Diseases ; Hypertension ; Hypertension, Pulmonary ; Pulmonary Artery ; Rats
    Language English
    Publishing date 2017-12-11
    Publishing country United States
    Document type Letter ; Comment
    ZDB-ID 3104-5
    ISSN 1097-685X ; 0022-5223
    ISSN (online) 1097-685X
    ISSN 0022-5223
    DOI 10.1016/j.jtcvs.2017.09.021
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  3. Article: Urinary Titin Is Increased in Patients After Cardiac Surgery.

    Tanihata, Jun / Nishioka, Naritomo / Inoue, Takahiro / Bando, Ko / Minamisawa, Susumu

    Frontiers in cardiovascular medicine

    2019  Volume 6, Page(s) 7

    Abstract: Background: ...

    Abstract Background:
    Language English
    Publishing date 2019-02-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2781496-8
    ISSN 2297-055X
    ISSN 2297-055X
    DOI 10.3389/fcvm.2019.00007
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  4. Article ; Online: Standard-dose gentamicin does not increase risk of patent ductus arteriosus.

    Kishibuchi, Ayana / Akaike, Toru / Minamisawa, Susumu

    Pediatrics and neonatology

    2019  Volume 61, Issue 1, Page(s) 45–50

    Abstract: Background: Rates of patent ductus arteriosus (PDA) and infection are high in preterm infants. Preterm infants with infection are more likely to develop symptomatic PDA, a potentially fatal disease. Clinically, gentamicin is widely used for early-onset ... ...

    Abstract Background: Rates of patent ductus arteriosus (PDA) and infection are high in preterm infants. Preterm infants with infection are more likely to develop symptomatic PDA, a potentially fatal disease. Clinically, gentamicin is widely used for early-onset infection in neonates including preterm infants. A recent study demonstrated that standard-dose gentamicin itself, not infection, increased risk of PDA in mice, suggesting that gentamicin should be avoided in neonates with a risk of PDA. This claim has been insufficiently investigated in subsequent in-vivo experiments. We reevaluated the in-vivo effect of standard-dose gentamicin on patency of the rat ductus arteriosus (DA).
    Methods: 1) To evaluate the effect of gentamicin on DA patency duration, gentamicin was intraperitoneally injected immediately after birth. 2) To evaluate the effect of gentamicin on DA reopening, gentamicin was intraperitoneally injected 30 min after birth. In both scenarios, 30 min after gentamicin administration, rapid whole-body freezing was performed and the inner diameter of the DA was measured.
    Results: Standard-dose gentamicin (5 μg/g) did not prolong patency of the DA or increase the likelihood of DA reopening in rat neonates. High-dose gentamicin (100 μg/g), however, significantly prolonged patency of the DA and was associated with DA reopening in rat neonates, although the dilative effect did not reach statistical significance.
    Conclusion: Standard-dose gentamicin does not increase the risk of PDA in rat neonates. This study suggests that standard-dose gentamicin can be used to treat infection in neonates without increasing PDA morbidity.
    MeSH term(s) Animals ; Animals, Newborn ; Anti-Bacterial Agents/adverse effects ; Ductus Arteriosus, Patent/etiology ; Gentamicins/adverse effects ; Rats ; Rats, Wistar ; Risk
    Chemical Substances Anti-Bacterial Agents ; Gentamicins
    Language English
    Publishing date 2019-06-05
    Publishing country Singapore
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2441816-X
    ISSN 2212-1692 ; 1875-9572
    ISSN (online) 2212-1692
    ISSN 1875-9572
    DOI 10.1016/j.pedneo.2019.05.011
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  5. Article ; Online: Prostaglandin E

    Sakuma, Toshiki / Akaike, Toru / Minamisawa, Susumu

    Circulation journal : official journal of the Japanese Circulation Society

    2018  Volume 83, Issue 1, Page(s) 209–216

    Abstract: Background: Patent ductus arteriosus (PDA) is common in premature infants. Cyclooxygenase inhibitors such as indomethacin, which inhibit prostaglandin E: Conclusions: EP4 inhibition contracts rat DA with fewer side-effects. EP4 inhibition is a ... ...

    Abstract Background: Patent ductus arteriosus (PDA) is common in premature infants. Cyclooxygenase inhibitors such as indomethacin, which inhibit prostaglandin E
    Conclusions: EP4 inhibition contracts rat DA with fewer side-effects. EP4 inhibition is a promising alternative strategy to treat patients with PDA.
    MeSH term(s) Animals ; Benzamides/pharmacology ; Dinoprostone/metabolism ; Ductus Arteriosus/embryology ; Ductus Arteriosus/pathology ; Ductus Arteriosus, Patent/embryology ; Myocardial Contraction/drug effects ; Rats ; Rats, Wistar ; Receptors, Prostaglandin E, EP4 Subtype/antagonists & inhibitors
    Chemical Substances (S)-4-(1-(5-chloro-2-(4-fluorophenyoxy) benzamido)ethyl) benzoic acid ; Benzamides ; Receptors, Prostaglandin E, EP4 Subtype ; Dinoprostone (K7Q1JQR04M)
    Language English
    Publishing date 2018-11-10
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 2068090-9
    ISSN 1347-4820 ; 1346-9843
    ISSN (online) 1347-4820
    ISSN 1346-9843
    DOI 10.1253/circj.CJ-18-0761
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  6. Article ; Online: Notch and retinoic acid signals regulate macrophage formation from endocardium downstream of Nkx2-5.

    Liu, Norika / Kawahira, Naofumi / Nakashima, Yasuhiro / Nakano, Haruko / Iwase, Akiyasu / Uchijima, Yasunobu / Wang, Mei / Wu, Sean M / Minamisawa, Susumu / Kurihara, Hiroki / Nakano, Atsushi

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 5398

    Abstract: Hematopoietic progenitors are enriched in the endocardial cushion and contribute, in a Nkx2-5-dependent manner, to tissue macrophages required for the remodeling of cardiac valves and septa. However, little is known about the molecular mechanism of ... ...

    Abstract Hematopoietic progenitors are enriched in the endocardial cushion and contribute, in a Nkx2-5-dependent manner, to tissue macrophages required for the remodeling of cardiac valves and septa. However, little is known about the molecular mechanism of endocardial-hematopoietic transition. In the current study, we identified the regulatory network of endocardial hematopoiesis. Signal network analysis from scRNA-seq datasets revealed that genes in Notch and retinoic acid (RA) signaling are significantly downregulated in Nkx2-5-null endocardial cells. In vivo and ex vivo analyses validate that the Nkx2-5-Notch axis is essential for the generation of both hemogenic and cushion endocardial cells, and the suppression of RA signaling via Dhrs3 expression plays important roles in further differentiation into macrophages. Genetic ablation study revealed that these macrophages are essential in cardiac valve remodeling. In summary, the study demonstrates that the Nkx2-5/Notch/RA signaling plays a pivotal role in macrophage differentiation from hematopoietic progenitors.
    MeSH term(s) Endocardium ; Macrophages ; Histiocytes ; Cell Differentiation ; Tretinoin
    Chemical Substances Tretinoin (5688UTC01R)
    Language English
    Publishing date 2023-09-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-41039-6
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  7. Article ; Online: Troponin T amino acid mutation (ΔK210) knock-in mice as a neonatal dilated cardiomyopathy model.

    Tanihata, Jun / Fujii, Teruyuki / Baba, Shunsuke / Fujimoto, Yoshitaka / Morimoto, Sachio / Minamisawa, Susumu

    Pediatric research

    2020  Volume 89, Issue 4, Page(s) 846–857

    Abstract: Background: Dilated cardiomyopathy (DCM) in children is often associated with poor morbidity and mortality and exhibits distinct pathological entities from those of adult DCM. Owing to the limited number of patients and the lack of a good animal model, ... ...

    Abstract Background: Dilated cardiomyopathy (DCM) in children is often associated with poor morbidity and mortality and exhibits distinct pathological entities from those of adult DCM. Owing to the limited number of patients and the lack of a good animal model, the molecular mechanisms underlying pediatric DCM remain poorly understood. The purpose of this study is to establish an animal model of neonatal DCM and identify early progression factors.
    Methods: Cardiac phenotypes and comprehensive gene expression profiles in homozygous ΔK210 knock-in (TNNT2
    Results: Immediately after birth, the cardiac weight in TNNT2
    Conclusions: TNNT2
    Impact: TNNT2
    MeSH term(s) Animals ; Animals, Newborn ; Cardiomyopathy, Dilated/genetics ; Disease Models, Animal ; Down-Regulation ; Echocardiography ; Gene Expression Profiling ; Heart Ventricles/physiopathology ; Homozygote ; Mice ; Mice, Transgenic ; Mutation ; Oligonucleotide Array Sequence Analysis ; Phenotype ; Prognosis ; Troponin T/genetics ; Up-Regulation
    Chemical Substances Troponin T
    Language English
    Publishing date 2020-06-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 4411-8
    ISSN 1530-0447 ; 0031-3998
    ISSN (online) 1530-0447
    ISSN 0031-3998
    DOI 10.1038/s41390-020-1016-1
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  8. Article ; Online: Oxygenation decreases elastin secretion from rat ductus arteriosus smooth muscle cells.

    Kawakami, Shoji / Minamisawa, Susumu

    Pediatrics international : official journal of the Japan Pediatric Society

    2015  Volume 57, Issue 4, Page(s) 541–545

    Abstract: Background: The ductus arteriosus (DA), a fetal arterial connection between the main pulmonary artery and the descending aorta, normally closes immediately after birth. The oxygen concentration in the blood rises after birth, and in the DA this increase ...

    Abstract Background: The ductus arteriosus (DA), a fetal arterial connection between the main pulmonary artery and the descending aorta, normally closes immediately after birth. The oxygen concentration in the blood rises after birth, and in the DA this increase in oxygen concentration causes functional closure, which is induced by smooth muscle contraction. Previous studies have demonstrated that hypoxia and/or oxygenation affect vascular remodeling of various vessels. Therefore, we hypothesized that the rise in oxygen concentration would affect the vascular structure of the DA due to production of proteins secreted from DA smooth muscle cells (SMC).
    Methods and results: Liquid chromatography-tandem mass spectrometry was used to comprehensively investigate the secreted proteins in the supernatant of rat DA SMC harvested under hypoxic conditions (1% oxygen) or under normoxic conditions (21% oxygen). We found that the rise in oxygen concentration reduced the secretion of elastin from DA SMC. On reverse transcription-polymerase chain reaction, the expression of elastin mRNA was not significantly changed in DA SMC from hypoxic to normoxic conditions.
    Conclusions: Given that elastin forms internal elastic lamina and elastic fibers in the vascular muscle layers, and that a rise in oxygen concentration reduced the secretion of elastin, this suggests that the rise in blood oxygen concentration after birth reduces the secretion of elastin, and therefore may play a role in DA structural remodeling after birth.
    MeSH term(s) Animals ; Blotting, Western ; Cells, Cultured ; Disease Models, Animal ; Ductus Arteriosus/cytology ; Ductus Arteriosus/embryology ; Ductus Arteriosus/metabolism ; Elastin/biosynthesis ; Elastin/genetics ; Female ; Gas Chromatography-Mass Spectrometry ; Gene Expression Regulation, Developmental ; Hypoxia/genetics ; Hypoxia/metabolism ; Hypoxia/pathology ; Muscle, Smooth, Vascular/embryology ; Muscle, Smooth, Vascular/metabolism ; Oxygen/metabolism ; Oxygen Consumption/physiology ; Pregnancy ; Pregnancy, Animal ; RNA/genetics ; Rats ; Rats, Wistar ; Reverse Transcriptase Polymerase Chain Reaction ; Vascular Remodeling/genetics
    Chemical Substances RNA (63231-63-0) ; Elastin (9007-58-3) ; Oxygen (S88TT14065)
    Language English
    Publishing date 2015-08
    Publishing country Australia
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1470376-2
    ISSN 1442-200X ; 1328-8067
    ISSN (online) 1442-200X
    ISSN 1328-8067
    DOI 10.1111/ped.12684
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  9. Article ; Online: Fibrosis growth factor 23 is a promoting factor for cardiac fibrosis in the presence of transforming growth factor-β1.

    Kuga, Kazuhiro / Kusakari, Yoichiro / Uesugi, Ken / Semba, Kentaro / Urashima, Takashi / Akaike, Toru / Minamisawa, Susumu

    PloS one

    2020  Volume 15, Issue 4, Page(s) e0231905

    Abstract: Myocardial fibrosis is often associated with cardiac hypertrophy; indeed, fibrosis is one of the most critical factors affecting prognosis. We aimed to identify the molecules involved in promoting fibrosis under hypertrophic stimuli. We previously ... ...

    Abstract Myocardial fibrosis is often associated with cardiac hypertrophy; indeed, fibrosis is one of the most critical factors affecting prognosis. We aimed to identify the molecules involved in promoting fibrosis under hypertrophic stimuli. We previously established a rat model of cardiac hypertrophy by pulmonary artery banding, in which approximately half of the animals developed fibrosis in the right ventricle. Here, we first comprehensively analyzed mRNA expression in the right ventricle with or without fibrosis in pulmonary artery banding model rats by DNA microarray analysis (GSE141650 at NCBI GEO). The expression levels of 19 genes were up-regulated more than 1.5-fold in fibrotic hearts compared with non-fibrotic hearts. Among them, fibrosis growth factor (FGF) 23 showed one of the biggest increases in expression. Real-time PCR analysis also revealed that, among the FGF receptor (FGFR) family, FGFR1 was highly expressed in fibrotic hearts. We then found that FGF23 was expressed predominantly in cardiomyocytes, while FGFR1 was predominantly expressed in fibroblasts in the rat ventricle. Next, we added FGF23 and transforming growth factor (TGF)-β1 (10-50 ng/mL of each) to isolated fibroblasts from normal adult rat ventricles and cultured them for three days. While FGF23 itself did not directly affect the expression levels of any fibrosis-related mRNAs, FGF23 enhanced the effect of TGF-β1 on increasing the expression levels of α-smooth muscle actin (α-SMA) mRNA. This increase in xx-SMA mRNA levels due to the combination of TGF-β1 and FGF23 was attenuated by the inhibition of FGFR1 or the knockdown of FGFR1 in fibroblasts. Thus, FGF23 synergistically promoted the activation of fibroblasts with TGF-β1, transforming fibroblasts into myofibroblasts via FGFR1. Thus, we identified FGF23 as a paracrine factor secreted from cardiomyocytes to promote cardiac fibrosis under conditions in which TGF-β1 is activated. FGF23 could be a possible target to prevent fibrosis following myocardial hypertrophy.
    MeSH term(s) Actins/genetics ; Actins/metabolism ; Animals ; Cells, Cultured ; Disease Models, Animal ; Fibroblast Growth Factors/genetics ; Fibroblast Growth Factors/metabolism ; Fibroblast Growth Factors/pharmacology ; Fibroblasts/cytology ; Fibroblasts/metabolism ; Fibrosis ; Heart Diseases/metabolism ; Heart Diseases/pathology ; Male ; Myocytes, Cardiac/cytology ; Myocytes, Cardiac/metabolism ; Pyrroles/pharmacology ; Rats ; Rats, Sprague-Dawley ; Receptor, Fibroblast Growth Factor, Type 1/antagonists & inhibitors ; Receptor, Fibroblast Growth Factor, Type 1/metabolism ; Transforming Growth Factor beta1/pharmacology ; Up-Regulation/drug effects
    Chemical Substances Actins ; Pyrroles ; SU 5402 ; Transforming Growth Factor beta1 ; smooth muscle actin, rat ; Fibroblast Growth Factors (62031-54-3) ; fibroblast growth factor 23 (7Q7P4S7RRE) ; Fgfr1 protein, rat (EC 2.7.10.1) ; Receptor, Fibroblast Growth Factor, Type 1 (EC 2.7.10.1)
    Language English
    Publishing date 2020-04-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0231905
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  10. Article ; Online: Pathology and molecular mechanisms of coarctation of the aorta and its association with the ductus arteriosus.

    Yokoyama, Utako / Ichikawa, Yasuhiro / Minamisawa, Susumu / Ishikawa, Yoshihiro

    The journal of physiological sciences : JPS

    2016  Volume 67, Issue 2, Page(s) 259–270

    Abstract: Coarctation of the aorta (CoA) is defined as a congenital stenosis of the thoracic aorta and is one of the most common congenital cardiovascular diseases. Despite successful surgical treatment for CoA, arterial abnormalities, including refractory ... ...

    Abstract Coarctation of the aorta (CoA) is defined as a congenital stenosis of the thoracic aorta and is one of the most common congenital cardiovascular diseases. Despite successful surgical treatment for CoA, arterial abnormalities, including refractory hypertension, aortic aneurysm, and proatherogenic phenotypic changes, frequently affect patients' quality of life. Emerging evidence from morphological and molecular biological investigations suggest that the area of CoA is characterized by phenotypic modulation of smooth muscle cells, intimal thickening, and impaired elastic fiber formation. These changes extend to the pre-and post-stenotic aorta and impair arterial elasticity. The aim of this review is to present current findings on the pathology and molecular mechanisms of vascular remodeling due to CoA. In particular, we will discuss the association between CoA and the ductus arteriosus since the most common site for the stenosis is in the proximity of the ductus arteriosus.
    MeSH term(s) Animals ; Aorta/pathology ; Aortic Coarctation/pathology ; Ductus Arteriosus/pathology ; Endothelium, Vascular/pathology ; Humans ; Muscle, Smooth, Vascular/pathology
    Language English
    Publishing date 2016-12-20
    Publishing country Japan
    Document type Journal Article ; Review
    ZDB-ID 2234472-X
    ISSN 1880-6562 ; 1880-6546
    ISSN (online) 1880-6562
    ISSN 1880-6546
    DOI 10.1007/s12576-016-0512-x
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