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Kushibiki H, Mizukami H, Osonoi S, Takeuchi Y, Sasaki T, Ogasawara S, Wada K, Midorikawa S, Ryuzaki M, Wang Z, Yamada T, Yamazaki K, Tarusawa T, Tanba T, Mikami T, Matsubara A, Ishibashi Y, Hakamada K, Nakaji S. Tryptophan metabolism and small fibre neuropathy: a correlation study. Brain Commun 2024; 6:fcae103. [PMID: 38618209 PMCID: PMC11010654 DOI: 10.1093/braincomms/fcae103] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 01/10/2024] [Accepted: 03/24/2024] [Indexed: 04/16/2024] Open
Abstract
Small nerve fibres located in the epidermis sense pain. Dysfunction of these fibres decreases the pain threshold known as small fibre neuropathy. Diabetes mellitus is accompanied by metabolic changes other than glucose, synergistically eliciting small fibre neuropathy. These findings suggest that various metabolic changes may be involved in small fibre neuropathy. Herein, we explored the correlation between pain sensation and changes in plasma metabolites in healthy Japanese subjects. The pain threshold evaluated from the intraepidermal electrical stimulation was used to quantify pain sensation in a total of 1021 individuals in the 2017 Iwaki Health Promotion Project. Participants with a pain threshold evaluated from the intraepidermal electrical stimulation index <0.20 mA were categorized into the pain threshold evaluated from the intraepidermal electrical stimulation index-low group (n = 751); otherwise, they were categorized into the pain threshold evaluated from the intraepidermal electrical stimulation index-high group (n = 270). Metabolome analysis of plasma was conducted using capillary electrophoresis time-of-flight mass spectrometry. The metabolite set enrichment analysis revealed that the metabolism of tryptophan was significantly correlated with the pain threshold evaluated from the intraepidermal electrical stimulation index in all participants (P < 0.05). The normalized level of tryptophan was significantly decreased in participants with a high pain threshold evaluated from the intraepidermal electrical stimulation index. In addition to univariate linear regression analyses, the correlation between tryptophan concentration and the pain threshold evaluated from the intraepidermal electrical stimulation index remained significant after adjustment for multiple factors (β = -0.07615, P < 0.05). These findings indicate that specific metabolic changes are involved in the deterioration of pain thresholds. Here, we show that abnormal tryptophan metabolism is significantly correlated with an elevated pain threshold evaluated from the intraepidermal electrical stimulation index in the Japanese population. This correlation provides insight into the pathology and clinical application of small fibre neuropathy.
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Affiliation(s)
- Hanae Kushibiki
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Hiroki Mizukami
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Sho Osonoi
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
- Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Yuki Takeuchi
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
- Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Takanori Sasaki
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Saori Ogasawara
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Kanichiro Wada
- Department of Orthopaedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Shin Midorikawa
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
- Department of Otorhinolaryngology-Head and Neck Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Masaki Ryuzaki
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Zhenchao Wang
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Takahiro Yamada
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
- Department of Gastroenterological Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Keisuke Yamazaki
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
- Department of Gastroenterological Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Takefusa Tarusawa
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
- Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Taiyo Tanba
- Department of Pathology and Molecular Medicine, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
- Department of Gastroenterological Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Tatsuya Mikami
- Innovation Center for Health Promotion, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Atsushi Matsubara
- Department of Otorhinolaryngology-Head and Neck Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Yasuyuki Ishibashi
- Department of Orthopaedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Kenichi Hakamada
- Department of Gastroenterological Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Shigeyuki Nakaji
- Department of Social Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
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Endo S, Uto A, Miyashita K, Sato M, Inoue H, Fujii K, Hagiwara A, Ryuzaki M, Oshida T, Kinouchi K, Itoh H. Intermittent Fasting Sustainably Improves Glucose Tolerance in Normal Weight Male Mice Through Histone Hyperacetylation. J Endocr Soc 2023; 7:bvad082. [PMID: 37362383 PMCID: PMC10290492 DOI: 10.1210/jendso/bvad082] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Indexed: 06/28/2023] Open
Abstract
To explore the mechanism by which intermittent fasting (IF) exerts prolonged effects after discontinuation, we examined mice that had been subjected to 4 cycles of fasting for 72 hours and ad libitum feeding for 96 hours per week (72hIF), followed by 4 weeks of ad libitum feeding, focusing on expression of genes for lipid metabolism in the skeletal muscle and histone acetylation in the promoter region. The 72hIF regimen resulted in metabolic remodeling, characterized by enhanced lipid utilization and mitochondrial activation in the muscle. This long-term IF (72hIF) caused stronger metabolic effects than alternate day fasting (24hIF) wherein fasting and refeeding are repeated every 24 hours. Upregulation of lipid oxidation genes and an increase in oxygen utilization were sustained even at 4 weeks after discontinuation of 72hIF, associated with histone hyperacetylation of the promoter region of uncoupling protein 3 (Ucp3) and carnitine palmitoyl transferase 1b (Cpt1b) genes. An increase in leucine owing to fasting-induced muscle degradation was suggested to lead to the histone acetylation. These findings support the previously unappreciated notion that sustainable promotion of histone acetylation in lipid oxidation genes of the muscle and adipose tissues during and after IF may contribute to sustained metabolic effects of IF.
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Affiliation(s)
- Sho Endo
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, 160-8582, Japan
| | - Asuka Uto
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, 160-8582, Japan
| | - Kazutoshi Miyashita
- Correspondence: Kazutoshi Miyashita, MD, PhD, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan.
| | - Masaaki Sato
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, 160-8582, Japan
| | - Hiroyuki Inoue
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, 160-8582, Japan
| | - Kentaro Fujii
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, 160-8582, Japan
| | - Aika Hagiwara
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, 160-8582, Japan
| | - Masaki Ryuzaki
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, 160-8582, Japan
| | - Takuma Oshida
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, 160-8582, Japan
| | - Kenichiro Kinouchi
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, 160-8582, Japan
| | - Hiroshi Itoh
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, 160-8582, Japan
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Sugita E, Sonoda H, Ryuzaki M, Hashiguchi A, Tokuyama H, Wakino S, Kanda T, Itoh H. Diagnosis of monoclonal immunotactoid glomerulopathy with positive λ chain by immunoelectron microscopy. CEN Case Rep 2023; 12:7-13. [PMID: 35699924 PMCID: PMC9892404 DOI: 10.1007/s13730-022-00714-1] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Accepted: 05/24/2022] [Indexed: 02/05/2023] Open
Abstract
We report the case of a 73-year-old-man who developed immunotactoid glomerulopathy (ITG). ITG is a rare disease characterized by proliferative glomerulonephritis and capillary wall deposits with a 10-60 nm diameter microtubular substructure. In monoclonal ITG, immunofluorescence analysis typically exhibits IgG with light chain restriction. Recent reviews recommend distinguishing monoclonal ITG from polyclonal ITG because monoclonal ITG is associated with a higher incidence of hematological disorders and better responsiveness to clone-directed therapy and renal prognosis. In our case, IgG, IgA, and IgM were negative by routine immunofluorescence; however, immunoelectron microscopy revealed positive λ chain. At 6 months after renal biopsy, the IgG λ chain was detected in the serum and urine, reflecting possible monoclonality. Therefore, it is useful to perform immunoelectron microscopy and follow-up with serum and urine protein electrophoresis and immunofixation to diagnose monoclonal ITG, even when routine immunofluorescence shows negative or nonspecific findings.
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Affiliation(s)
- Erina Sugita
- Division of Endocrinology, Metabolism and Nephrology, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Homare Sonoda
- Division of Endocrinology, Metabolism and Nephrology, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Masaki Ryuzaki
- Division of Endocrinology, Metabolism and Nephrology, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Akinori Hashiguchi
- Department of Pathology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan
| | - Hirobumi Tokuyama
- Department of Internal Medicine, Tokyo Dental University Ichikawa General Hospital, 5-11-13 Sugano, Ishikawa-shi, Chiba, 272-8513, Japan
| | - Shu Wakino
- Division of Nephrology, Department of Internal Medicine, Tokushima University School of Medicine, 2-50-1 Kuramoto-cho, Tokushima-shi, Tokushima, 770-8503, Japan
| | - Takeshi Kanda
- Division of Endocrinology, Metabolism and Nephrology, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan.
| | - Hiroshi Itoh
- Division of Endocrinology, Metabolism and Nephrology, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan
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Ryuzaki M, Miyashita K, Sato M, Inoue H, Fujii K, Hagiwara A, Uto A, Endo S, Oshida T, Kinouchi K, Itoh H. Activation of the intestinal tissue renin-angiotensin system by transient sodium loading in salt-sensitive rats. J Hypertens 2022; 40:33-45. [PMID: 34285148 PMCID: PMC8654260 DOI: 10.1097/hjh.0000000000002974] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 06/14/2021] [Accepted: 07/04/2021] [Indexed: 11/25/2022]
Abstract
BACKGROUND The renal tissue renin-angiotensin system is known to be activated by salt loading in salt-sensitive rats; however, the response in other organs remains unclear. METHOD Spontaneously hypertensive rats were subjected to normal tap water or transient high-salt-concentration water from 6 to 14 weeks of age and were thereafter given normal tap water. From 18 to 20 weeks of age, rats given water with a high salt concentration were treated with an angiotensin II type 1 receptor blocker, valsartan. RESULTS Sustained blood pressure elevation by transient salt loading coincided with a persistent decrease in the fecal sodium content and sustained excess of the circulating volume in spontaneously hypertensive rats. Administration of valsartan sustainably reduced the blood pressure and normalized the fecal sodium levels. Notably, transient salt loading persistently induced the intestinal tissue renin-angiotensin system and enhanced sodium transporter expression exclusively in the small intestine of salt-sensitive rats, suggesting the potential connection of intestinal sodium absorption to salt sensitivity. CONCLUSION These results reveal the previously unappreciated contribution of the intestinal tissue renin-angiotensin system to sodium homeostasis and blood pressure regulation in the pathophysiology of salt-sensitive hypertension.
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Affiliation(s)
- Masaki Ryuzaki
- Division of Endocrinology, Metabolism, and Nephrology, Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
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Uto A, Miyashita K, Endo S, Sato M, Ryuzaki M, Kinouchi K, Mitsuishi M, Meguro S, Itoh H. Transient Dexamethasone Loading Induces Prolonged Hyperglycemia in Male Mice With Histone Acetylation in Dpp-4 Promoter. Endocrinology 2021; 162:6364113. [PMID: 34480538 PMCID: PMC8475716 DOI: 10.1210/endocr/bqab193] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Indexed: 12/21/2022]
Abstract
Glucocorticoid causes hyperglycemia, which is common in patients with or without diabetes. Prolonged hyperglycemia can be experienced even after the discontinuation of glucocorticoid use. In the present study, we examined the time course of blood glucose level in hospital patients who received transient glucocorticoid treatment. In addition, the mechanism of prolonged hyperglycemia was investigated by using dexamethasone (Dexa)-treated mice and cultured cells. The blood glucose level in glucose tolerance tests, level of insulin and glucagon-like peptide 1 (GLP-1), and the activity of dipeptidyl peptidase 4 (DPP-4) were examined during and after Dexa loading in mice, with histone acetylation level of the promoter region. Mice showed prolonged hyperglycemia during and after transient Dexa loading accompanied by persistently lower blood GLP-1 level and higher activity of DPP-4. The expression level of Dpp-4 was increased in the mononuclear cells and the promoter region of Dpp-4 was hyperacetylated during and after the transient Dexa treatment. In vitro experiments also indicated development of histone hyperacetylation in the Dpp-4 promoter region during and after Dexa treatment. The upregulation of Dpp-4 in cultured cells was significantly inhibited by a histone acetyltransferase inhibitor. Moreover, the histone hyperacetylation induced by Dexa was reversible by treatment with a sirtuin histone deacetylase activator, nicotinamide mononucleotide. We identified persistent reduction in blood GLP-1 level with hyperglycemia during and after Dexa treatment in mice, associated with histone hyperacetylation of promoter region of Dpp-4. The results unveil a novel mechanism of glucocorticoid-induced hyperglycemia, and suggest therapeutic intervention through epigenetic modification of Dpp-4.
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Affiliation(s)
- Asuka Uto
- Division of Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, 160-8582, Japan
| | - Kazutoshi Miyashita
- Correspondence: Kazutoshi Miyashita, MD, Division of Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo, 160-8582, Japan.
| | - Sho Endo
- Division of Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, 160-8582, Japan
| | - Masaaki Sato
- Division of Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, 160-8582, Japan
| | - Masaki Ryuzaki
- Division of Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, 160-8582, Japan
| | - Kenichiro Kinouchi
- Division of Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, 160-8582, Japan
| | - Masanori Mitsuishi
- Division of Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, 160-8582, Japan
| | - Shu Meguro
- Division of Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, 160-8582, Japan
| | - Hiroshi Itoh
- Division of Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, 160-8582, Japan
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Itabashi C, Mizukami H, Osonoi S, Takahashi K, Kudo K, Wada K, Inaba W, Danyang G, Uchida C, Umetsu S, Igawa A, Ogasawara S, Ryuzaki M, Komeda K, Ishibashi Y, Yagihashi S, Nakaji S. Corrigendum: Normal High HbA1c a Risk Factor for Abnormal Pain Threshold in the Japanese Population. Front Endocrinol (Lausanne) 2020; 11:130. [PMID: 32210922 PMCID: PMC7076298 DOI: 10.3389/fendo.2020.00130] [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] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Accepted: 02/26/2020] [Indexed: 11/13/2022] Open
Abstract
[This corrects the article DOI: 10.3389/fendo.2019.00651.].
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Affiliation(s)
- Chieko Itabashi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Hiroki Mizukami
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
- *Correspondence: Hiroki Mizukami
| | - Sho Osonoi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kazuhisa Takahashi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kazuhiro Kudo
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kanichiro Wada
- Department of Orthopedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Wataru Inaba
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Guo Danyang
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Chiaki Uchida
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
- Department of Gastrointestinal Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Satoko Umetsu
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
- Department of Gastrointestinal Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Akiko Igawa
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
- Department of Gastrointestinal Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Saori Ogasawara
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Masaki Ryuzaki
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kouji Komeda
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Yasuyuki Ishibashi
- Department of Orthopedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Soroku Yagihashi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Shigeyuki Nakaji
- Department of Social Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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Fujii K, Kubo A, Miyashita K, Sato M, Hagiwara A, Inoue H, Ryuzaki M, Tamaki M, Hishiki T, Hayakawa N, Kabe Y, Itoh H, Suematsu M. Xanthine oxidase inhibitor ameliorates postischemic renal injury in mice by promoting resynthesis of adenine nucleotides. JCI Insight 2019; 4:124816. [PMID: 31723053 PMCID: PMC6948864 DOI: 10.1172/jci.insight.124816] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 10/10/2019] [Indexed: 01/09/2023] Open
Abstract
Although oxidative stress plays central roles in postischemic renal injury, region-specific alterations in energy and redox metabolism caused by short-duration ischemia remain unknown. Imaging mass spectrometry enabled us to reveal spatial heterogeneity of energy and redox metabolites in the postischemic murine kidney. After 10-minute ischemia and 24-hour reperfusion (10mIR), in the cortex and outer stripes of the outer medulla, ATP substantially decreased, but not in the inner stripes of the outer medulla and inner medulla. 10mIR caused renal injury with elevation of fractional excretion of sodium, although histological damage by oxidative stress was limited. Ischemia-induced NADH elevation in the cortex indicated prolonged production of reactive oxygen species by xanthine oxidase (XOD). However, consumption of reduced glutathione after reperfusion suggested the amelioration of oxidative stress. An XOD inhibitor, febuxostat, which blocks the degradation pathway of adenine nucleotides, promoted ATP recovery and exerted renoprotective effects in the postischemic kidney. Because effects of febuxostat were canceled by silencing of the hypoxanthine phosphoribosyl transferase 1 gene in cultured tubular cells, mechanisms for the renoprotective effects appear to involve the purine salvage pathway, which uses hypoxanthine to resynthesize adenine nucleotides, including ATP. These findings suggest a novel therapeutic approach for acute ischemia/reperfusion renal injury with febuxostat through salvaging high-energy adenine nucleotides.
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Affiliation(s)
- Kentaro Fujii
- Division of Endocrinology and Metabolism and Nephrology, Department of Internal Medicine and
| | - Akiko Kubo
- Department of Biochemistry, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
| | - Kazutoshi Miyashita
- Division of Endocrinology and Metabolism and Nephrology, Department of Internal Medicine and
| | - Masaaki Sato
- Division of Endocrinology and Metabolism and Nephrology, Department of Internal Medicine and
| | - Aika Hagiwara
- Division of Endocrinology and Metabolism and Nephrology, Department of Internal Medicine and
| | - Hiroyuki Inoue
- Division of Endocrinology and Metabolism and Nephrology, Department of Internal Medicine and
| | - Masaki Ryuzaki
- Division of Endocrinology and Metabolism and Nephrology, Department of Internal Medicine and
| | - Masanori Tamaki
- Division of Endocrinology and Metabolism and Nephrology, Department of Internal Medicine and
- Department of Nephrology, Graduate School of Medical Sciences, Tokushima University, Tokushima City, Tokushima, Japan
| | - Takako Hishiki
- Department of Biochemistry, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
- Clinical and Translational Research Center, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
| | - Noriyo Hayakawa
- Clinical and Translational Research Center, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
| | - Yasuaki Kabe
- Department of Biochemistry, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
| | - Hiroshi Itoh
- Division of Endocrinology and Metabolism and Nephrology, Department of Internal Medicine and
| | - Makoto Suematsu
- Department of Biochemistry, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
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Ryuzaki M, Tokuyama H, Uchiyama K, Nakaya H, Hasegawa K, Miyashita K, Konishi K, Hashiguchi A, Wakino S, Itoh H. Acute Interstitial Nephritis With Karyomegalic Epithelial Cells After Nivolumab Treatment-Two Case Reports. Clin Med Insights Case Rep 2019; 12:1179547619853647. [PMID: 31223235 PMCID: PMC6566467 DOI: 10.1177/1179547619853647] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 05/09/2019] [Accepted: 04/04/2019] [Indexed: 01/22/2023]
Abstract
Clinical application of immune checkpoint inhibitors (CPIs) including nivolumab is expanding in the field of oncology treatment. Nivolumab is an anti-programmed death 1 protein (PD-1) antibody designed to augment an immunologic reaction against cancer cells. On the contrary, CPIs are known to cause a unique variety of side effects termed as immune-related adverse events, which can affect any organ including kidney. However, the characteristics of renal disorders by nivolumab treatment are poorly described. We describe two cases of acute kidney injury that were treated with nivolumab. Two patients, one with renal-cell carcinoma and the other with lung cancer, exhibited progressive renal dysfunction after the initiation of nivolumab treatment. By kidney biopsy, each case was diagnosed as acute interstitial nephritis (AIN). Of note, tubular epithelial cells enlarged with hyperchromatic nuclei were focally observed, and this finding was consistent with karyomegalic tubular epithelial cells. In immunostaining, most of the enlarged tubular epithelial cells were positive for Ki-67, which suggested regeneration of tubular epithelial cells. Clinically, in one case, renal function was partially recovered with the discontinuation of nivolumab, while in another case renal function was fully recovered with additional corticosteroid treatment. We presented nivolumab-induced AIN with karyomegalic changes of tubular epithelia. We propose that immunosuppressive therapy may be necessary for the full recovery from renal impairment.
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Affiliation(s)
- Masaki Ryuzaki
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Hirobumi Tokuyama
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Kiyotaka Uchiyama
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Hideaki Nakaya
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Kazuhiro Hasegawa
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Kazutoshi Miyashita
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Kohnosuke Konishi
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Akinori Hashiguchi
- Department of Pathology, School of Medicine, Keio University, Tokyo, Japan
| | - Shu Wakino
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Hiroshi Itoh
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
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Ryuzaki M, Miyashita K, Sato M, Uto A, Endo S, Fujii K, Inoue H, Kinouchi K, Itoh H. SP039HYPERTENSION-RELATED PROTEIN DEACETYLASE SIRT3 AFFECTS BLOOD PRESSURE THROUGH REGULATION OF INTESTINAL SALT ABSORPTION IN MICE. Nephrol Dial Transplant 2019. [DOI: 10.1093/ndt/gfz103.sp039] [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: 11/14/2022] Open
Affiliation(s)
| | | | - Masaaki Sato
- Keio University, School of Medicine, Tokyo, Japan
| | - Asuka Uto
- Keio University, School of Medicine, Tokyo, Japan
| | - Sho Endo
- Keio University, School of Medicine, Tokyo, Japan
| | | | | | | | - Hiroshi Itoh
- Keio University, School of Medicine, Tokyo, Japan
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10
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Inoue H, Miyashita K, Sato M, Hagiwara A, Fujii K, Ryuzaki M, Endo S, Uto A, Kinouchi K, Itoh H. SP037SIGNIFICANCE OF EPIGENETIC MODIFICATION IN THE KIDNEY FOR THE ONSET AND PERSISTENCE OF HYPERTENSION AFTER TRANSIENT SALT LOADING IN MICE. Nephrol Dial Transplant 2019. [DOI: 10.1093/ndt/gfz103.sp037] [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: 11/13/2022] Open
Affiliation(s)
| | | | - Masaaki Sato
- Keio University, School of Medicine, Tokyo, Japan
| | | | | | | | - Sho Endo
- Keio University, School of Medicine, Tokyo, Japan
| | - Asuka Uto
- Keio University, School of Medicine, Tokyo, Japan
| | | | - Hiroshi Itoh
- Keio University, School of Medicine, Tokyo, Japan
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11
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Yasuda I, Hasegawa K, Tokuyama H, Washida N, Shinozuka K, Yasuda M, Ryuzaki M, Urai H, Wakino S, Itoh H. A Case Report of Autosomal Dominant Polycystic Kidney Disease Under Peritoneal Dialysis With Cyst Infection and Culture-Positive Peritoneal Fluid. Clin Med Insights Case Rep 2019; 12:1179547619846860. [PMID: 31065220 PMCID: PMC6488781 DOI: 10.1177/1179547619846860] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 03/21/2019] [Indexed: 01/14/2023]
Abstract
Background: Cyst infection is a complication sometimes seen in patients with autosomal
dominant polycystic kidney disease (ADPKD) and often shows through a
positive blood culture. However, there have been no reports of ADPKD
patients whose cyst infection propagate to peritoneal fluid leading to
positive peritoneal fluid culture. Case presentation: A 74-year-old Japanese man with ADPKD under peritoneal dialysis (PD) was
presented with left flank pain, fever, and chills at our hospital. He did
not show any symptoms or signs suggestive of peritonitis. There were no
elevated cell counts or polymorphonuclear leucocytes in his PD fluid. There
were some complicated cysts found in computed tomography and magnetic
resonance imaging examinations. We clinically diagnosed him as having a
renal cyst infection rather than PD-related peritonitis. We initiated
treatment by administering ceftriaxone with an immediate favorable response.
As the possibility of accompanying prostatitis still remained, we switched
to intravenous levofloxacin on the second day. On the 10th day,
Helicobacter cinaedi was detected in 2 sets of blood
culture as well as in PD fluid. We switched back to ceftriaxone and this
treatment was entirely successful. Conclusions: This is the first report of H cinaedi cyst infection which
propagates to peritoneal fluid in a patient with ADPKD.
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Affiliation(s)
- Itaru Yasuda
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Kazuhiro Hasegawa
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Hirobumi Tokuyama
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Naoki Washida
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan.,Department of Nephrology, School of Medicine, International University of Health and Welfare, Narita, Japan
| | - Keisuke Shinozuka
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Marie Yasuda
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Masaki Ryuzaki
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Hidenori Urai
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Shu Wakino
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
| | - Hiroshi Itoh
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
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12
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Itabashi C, Mizukami H, Osonoi S, Takahashi K, Kudo K, Wada K, Inaba W, Danyang G, Uchida C, Umetsu S, Igawa A, Ogasawara S, Ryuzaki M, Komeda K, Ishibashi Y, Yagihashi S, Nakaji S. Normal High HbA1c a Risk Factor for Abnormal Pain Threshold in the Japanese Population. Front Endocrinol (Lausanne) 2019; 10:651. [PMID: 31632344 PMCID: PMC6783489 DOI: 10.3389/fendo.2019.00651] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 09/06/2019] [Indexed: 11/23/2022] Open
Abstract
Purpose: Small fiber dysfunction is common in subjects with diabetic polyneuropathy (DPN). It is unsettled, however, whether marginal glucose intolerance is implicated in the onset and progression of small fiber dysfunction. Herein, we explored the relationship between glycated hemoglobin levels (HbA1c) and pain sensation in the Japanese population. Methods: A population-based study of 894 individuals (352 men, 542 women; average age 53.8 ± 0.5 years) and 55 subjects with impaired fasting glucose (IFG) in the 2017 Iwaki project were enrolled in this study. Individuals with diabetes were excluded. Relationships between pain threshold for intraepidermal electrical stimulation (P-IES) and parameters associated with metabolic syndrome were examined. Results: P-IES was elevated with increasing of age in women but not in men. Average P-IES (mA) was increased in IFG subjects (n = 55, 0.20 ± 0.03) compared with normoglycemic/non-IFG individuals (n = 894, 0.15 ± 0.11) (p < 0.01). It was comparable between IFG and a group of normal high HbA1c (5.9-6.4%). Univariate linear regression analyses showed no influence of sex, triglyceride, or cholesterol on the value of P-IES. In contrast, there were significant correlations between P-IES and serum HbA1c level (ß = 0.120, p < 0.001) Adjustments for the multiple clinical measurements confirmed positive correlation of P-IES with HbA1c (ß = 0.077, p = 0.046). Conclusion: Individuals with normal high HbA1c exhibited an elevated P-IES in a healthy Japanese population which may be useful for the screening of subclinical DPN.
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Affiliation(s)
- Chieko Itabashi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Hiroki Mizukami
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
- *Correspondence: Hiroki Mizukami
| | - Sho Osonoi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kazuhisa Takahashi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kazuhiro Kudo
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kanichiro Wada
- Department of Orthopedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Wataru Inaba
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Guo Danyang
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Chiaki Uchida
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
- Department of Gastrointestinal Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Satoko Umetsu
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
- Department of Gastrointestinal Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Akiko Igawa
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
- Department of Gastrointestinal Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Saori Ogasawara
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Masaki Ryuzaki
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kouji Komeda
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Yasuyuki Ishibashi
- Department of Orthopedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Soroku Yagihashi
- Department of Pathology and Molecular Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Shigeyuki Nakaji
- Department of Social Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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13
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Inoue H, Miyashita K, Sato M, Hagiwara A, Fujii K, Ryuzaki M, Endo S, Uto A, Itoh H. A13299 Significance of epigenetic modification in each segment of the kidney for the induction of hypertension after transient salt loading in mice. J Hypertens 2018. [DOI: 10.1097/01.hjh.0000548284.65064.55] [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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14
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Inoue H, Miyashita K, Sato M, Hagiwara A, Fujii K, Ryuzaki M, Endo S, Uto A, Itoh H. SP068EPIGENETIC MODIFICATION IN EACH SEGMENT OF THE KIDNEY AFTER TRANSIENT SALT LOADING IN MICE AND THE IMPORTANCE OF ENVIRONMENTAL FACTORS. Nephrol Dial Transplant 2018. [DOI: 10.1093/ndt/gfy104.sp068] [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: 11/12/2022] Open
Affiliation(s)
- Hiroyuki Inoue
- Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, Japan
| | - Kazutoshi Miyashita
- Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, Japan
| | - Masaaki Sato
- Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, Japan
| | - Aika Hagiwara
- Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, Japan
| | - Kentaro Fujii
- Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, Japan
| | - Masaki Ryuzaki
- Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, Japan
| | - Sho Endo
- Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, Japan
| | - Asuka Uto
- Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, Japan
| | - Hiroshi Itoh
- Endocrinology, Metabolism and Nephrology, Keio University, School of Medicine, Tokyo, Japan
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15
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Fujii K, Miyashita K, Kubo A, Sato M, Hagiwara A, Inoue H, Ryuzaki M, Endo S, Uto A, Suematsu M, Itoh H. FP219A SEMI-QUANTITAIVE IMAGING MASS SPECTROMETRY REVEALED THE RENO-PROTECTIVE EFFECT OF FEBUXOSTAT IN THE ISCHEMIC KIDNEY BY PROMOTING ATP RECOVERY IN THE CORTEX. Nephrol Dial Transplant 2018. [DOI: 10.1093/ndt/gfy104.fp219] [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: 11/12/2022] Open
Affiliation(s)
- Kentaro Fujii
- Department of Endocrinology, Metabolism and Nephrology, Keio University, Tokyo, Japan
| | - Kazutoshi Miyashita
- Department of Endocrinology, Metabolism and Nephrology, Keio University, Tokyo, Japan
| | - Akiko Kubo
- Department of Biochemistry, Keio University, Tokyo, Japan
| | - Masaaki Sato
- Department of Endocrinology, Metabolism and Nephrology, Keio University, Tokyo, Japan
| | - Aika Hagiwara
- Department of Endocrinology, Metabolism and Nephrology, Keio University, Tokyo, Japan
| | - Hiroyuki Inoue
- Department of Endocrinology, Metabolism and Nephrology, Keio University, Tokyo, Japan
| | - Masaki Ryuzaki
- Department of Endocrinology, Metabolism and Nephrology, Keio University, Tokyo, Japan
| | - Sho Endo
- Department of Endocrinology, Metabolism and Nephrology, Keio University, Tokyo, Japan
| | - Asuka Uto
- Department of Endocrinology, Metabolism and Nephrology, Keio University, Tokyo, Japan
| | | | - Hiroshi Itoh
- Department of Endocrinology, Metabolism and Nephrology, Keio University, Tokyo, Japan
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16
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Fujii C, Miyashita K, Mitsuishi M, Sato M, Fujii K, Inoue H, Hagiwara A, Endo S, Uto A, Ryuzaki M, Nakajima M, Tanaka T, Tamaki M, Muraki A, Kawai T, Itoh H. Treatment of sarcopenia and glucose intolerance through mitochondrial activation by 5-aminolevulinic acid. Sci Rep 2017. [PMID: 28638045 PMCID: PMC5479778 DOI: 10.1038/s41598-017-03917-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [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] [Indexed: 12/24/2022] Open
Abstract
Recently, sarcopenia has attracted attention as therapeutic target because it constitutes a risk factor for metabolic and cardiovascular diseases. We focused 5-aminolevulinic acid (ALA) which act as electron carriers in the mitochondrial electron transport system. The mice that received ALA for 8 weeks gained muscle strength and endurance, and exhibited increased muscle mass and mitochondrial amount. Administration of ALA to sarcopenia mice aged 100 weeks and chronic kidney disease (CKD) model mice also increased muscle mass and improved physical performance. Metabolome analysis revealed increased branched-chain amino acids (BCAAs) levels in the skeletal muscle of ALA-treated mice. Quantitative PCR analysis revealed decreased expression levels in branched-chain amino acid transaminases (BCATs) that degrade BCAAs and other muscle-degrading factors, and increased levels of mitochondria-activating factors. We also studied in cultured myocytes and obtained compatible results. ALA-treated mice tended to increase body weight, but reduced blood glucose level. These suggested that ALA treatment not only activated muscle mitochondria but also enhanced muscle mass through an increase in BCAAs contents, as to improve muscle strength, endurance and glucose tolerance in mice. In these ways, muscle mitochondrial activation with ALA is suggested to be useful for the treatment of sarcopenia and glucose intolerance.
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Affiliation(s)
- Chikako Fujii
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Kazutoshi Miyashita
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan.
| | - Masanori Mitsuishi
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Masaaki Sato
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Kentaro Fujii
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Hiroyuki Inoue
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Aika Hagiwara
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Sho Endo
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Asuka Uto
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Masaki Ryuzaki
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | | | | | - Masanori Tamaki
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Ayako Muraki
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Toshihide Kawai
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
| | - Hiroshi Itoh
- Department of Endocrinology, Metabolism and Nephrology, Keio University School of Medicine, Tokyo, Japan
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17
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Fujii K, Miyashita K, Kubo A, Sato M, Hagiwara A, Inoue H, Ryuzaki M, Suematsu M, Itoh H. SP166ADENOSINE A2 RECEPTORS ARE INDISPENSABLE FOR THE MAINTANANCE OF RENAL BLOOD FLOW UNDER ACUTE ISCHEMIA. Nephrol Dial Transplant 2017. [DOI: 10.1093/ndt/gfx142.sp166] [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: 11/12/2022] Open
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18
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Ryuzaki M, Tokuyama H, Uchiyama K, Nakaya H, Hasegawa K, Miyashita K, Wakino S, Itoh H. MP079TWO CASES OF ACUTE KIDNEY INJURY WITH KARYOMEGALIC INTERSTITIAL NEPHRITIS AFTER NIVOLUMAB TREATMENT. Nephrol Dial Transplant 2017. [DOI: 10.1093/ndt/gfx162.mp079] [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: 11/13/2022] Open
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19
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Inoue H, Miyashita K, Sato M, Hagiwara A, Fujii K, Ryuzaki M, Itoh H. SP044HISTONE ACETYLATION IN EACH SEGMENT OF THE KIDNEY AFTER TRANSIENT SALT LOADING IN MICE AND THE SIGNIFICANCE FOR THE ONSET OF PERSISTENT HYPERTENSION. Nephrol Dial Transplant 2017. [DOI: 10.1093/ndt/gfx139.sp044] [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] Open
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20
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Ryuzaki M, Morimoto S, Niiyama M, Seki Y, Yoshida N, Oshima Y, Mizuguchi Y, Watanabe D, Ando T, Ichihara A. The Relationships between the Differences in the Central Blood Pressure and Brachial Blood Pressure and Other Factors in Patients with Essential Hypertension. Intern Med 2017; 56:587-596. [PMID: 28321055 PMCID: PMC5410465 DOI: 10.2169/internalmedicine.56.7597] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Objective The management of blood pressure (BP) in hypertensive patients is the key to preventing a progression of organ damage. The brachial BP (bBP) has been used as the representative method for measuring the BP. The central BP (cBP), which is, different from the bBP due to the propagation and the reflection of the pulse wave in the arterial system, has recently received attention because it can now be estimated non-invasively. We examined the relationships between the difference in the central systolic BP (csBP) and the brachial systolic BP (bsBP) (Δ) and other factors in hypertensive patients. Methods The bsBP and csBP were measured in patients with essential hypertension and the relationships between the bsBP, csBP, or Δ and background factors including age, the brain natriuretic peptide (BNP) level, the estimated glomerular filtration rate (eGFR), flow-mediated vasodilation (an index of vascular endothelial function), the cardio-ankle vascular index (CAVI, an index of arteriosclerosis), and the carotid intima-media thickness (an index of atherosis) were investigated. Results The data of 191 patients were analyzed. Although there was no significant correlation between the CAVI and the bsBP; positive correlations were observed between the CAVI and the csBP (r=0.249, p=0.001). The Δ value showed significant positive correlations with age, and the BNP, eGFR, and CAVI values. Conclusion The csBP is more strongly associated with arteriosclerosis than the bsBP. Moreover, the Δ value is more strongly associated with cardiac function, renal function, and arteriosclerosis than the bsBP or csBP. These data suggested that the Δ value may have a greater prognostic value than the bsBP or csBP and may be worth calculating in the clinical setting.
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Affiliation(s)
- Masaki Ryuzaki
- Department of Medicine II, Endocrinology and Hypertension, Tokyo Women's Medical University, Japan
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21
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Fusaro M, Fusaro M, Noale M, Tripepi G, D'angelo A, Miozzo D, Gallieni M, Study Group PV, Tsamelesvili M, Dimitriadis C, Papagianni A, Raidis C, Efstratiadis G, Memmos D, Mutluay R, Konca Degertekin C, Derici U, Deger SM, Akkiyal F, Gultekin S, Gonen S, Tacoy G, Arinsoy T, Sindel S, Sanchez-Perales C, Vazquez E, Merino E, Perez Del Barrio P, Borrego FJ, Borrego MJ, Liebana A, Krzanowski M, Janda K, Dumnicka P, Krasniak A, Sulowicz W, Kim YO, Yoon SA, Yun YS, Song HC, Kim BS, Cheong MA, Pasch A, Farese S, Floege J, Jahnen-Dechent W, Ohtake T, Ohtake T, Furuya R, Iwagami M, Tsutsumi D, Mochida Y, Ishioka K, Oka M, Maesato K, Moriya H, Hidaka S, Kobayashi S, Guedes A, Malho Guedes A, Pinho A, Fragoso A, Cruz A, Mendes P, Morgado E, Bexiga I, Silva AP, Neves P, Oyake N, Suzuki K, Itoh S, Yano S, Turkmen K, Kayikcioglu H, Ozbek O, Saglam M, Toker A, Tonbul HZ, Gelev S, Trajceska L, Srbinovska E, Pavleska S, Amitov V, Selim G, Dzekova P, Sikole A, Bouarich H, Lopez S, Alvarez C, Arribas I, DE Sequera P, Rodriguez D, Fusaro M, Fusaro M, Noale M, Tripepi G, D'angelo A, Miozzo D, Gallieni M, Study Group PV, Tanaka S, Kanemitsu T, Sugahara M, Kobayashi M, Uchida L, Ishimoto Y, Kotera N, Tanimoto S, Tanabe K, Hara K, Sugimoto T, Mise N, Goldstein B, Turakhia M, Arce C, Winkelmayer W, Zayed BED, Said K, Nishimura M, Nishimura M, Okamoto Y, Tokoro T, Nishida M, Hashimoto T, Iwamoto N, Takahashi H, Ono T, Nishimura M, Okamoto Y, Tokoro T, Sato N, Nishida M, Hashimoto T, Iwamoto N, Takahashi H, Ono T, Guedes A, Malho Guedes A, Cruz A, Morgado E, Pinho A, Fragoso A, Mendes P, Bexiga I, Silva AP, Neves P, Raimann J, Usvyat LA, Sands J, Levin NW, Kotanko P, Iwasaki M, Joki N, Tanaka Y, Ikeda N, Hayashi T, Kubo S, Imamura TA, Takahashi Y, Hirahata K, Imamura Y, Hase H, Claes K, Meijers B, Bammens B, Kuypers D, Naesens M, Vanrenterghem Y, Evenepoel P, Boscutti G, Calabresi L, Bosco M, Simonelli S, Boer E, Vitali C, Martone M, Mattei PL, Franceschini G, Baligh E, Zayed BED, Said K, El-Shafey E, Ezaat A, Zawada A, Rogacev K, Hummel B, Grun O, Friedrich A, Rotter B, Winter P, Geisel J, Fliser D, Heine GH, Makino JI, Makino KS, Ito T, Genovesi S, Santoro A, Fabbrini P, Rossi E, Pogliani D, Stella A, Bonforte G, Remuzzi G, Bertoli S, Pozzi C, Gallieni M, Pasquali S, Cagnoli L, Conte F, Santoro A, Buzadzic I, Tosic J, Dimkovic N, Djuric Z, Popovic J, Pejin Grubisa I, Barjaktarevic N, DI Napoli A, DI Lallo D, Salvatori MF, Franco F, Chicca S, Guasticchi G, Onofriescu M, Hogas S, Luminita V, Mugurel A, Gabriel V, Laura F, Irina M, Adrian C, Bosch E, Baamonde E, Culebras C, Perez G, El Hayek B, Ramirez JI, Ramirez A, Garcia C, Lago M, Toledo A, Checa MD, Taira T, Hirano T, Nohtomi K, Hyodo T, Chiba T, Saito A, Kim YK, Song HC, Choi EJ, Yang CW, Kim YS, Lim PS, Ming Ying W, Ya-Chung J, Zaripova I, Kayukov I, Essaian A, Nimgirova A, Young H, Dungey M, Watson EL, Baines R, Burton JO, Smith AC, Joki N, Iwasaki M, Tanaka Y, Kubo S, Hayashi T, Ikeda N, Yamazaki K, Hase H, Bossola M, Colacicco L, Scribano D, Vulpio C, Tazza L, Okada T, Okada N, Michibata I, Yura T, Montero N, Soler M, Pascual M, Barrios C, Marquez E, Rodriguez E, Orfila MA, Cao H, Arcos E, Comas J, Pascual J, Ferrario M, Garzotto F, Sironi T, Monacizzo S, Basso F, Garzotto F, Cruz DN, Moissl U, Tetta C, Signorini MG, Cerutti S, Ronco C, Mostovaya I, Grooteman M, Van den Dorpel M, Penne L, Van der Weerd N, Mazairac A, Den Hoedt C, Levesque R, Nube M, Ter Wee P, Bots M, Blankestijn P, Liu J, MA KL, Zhang X, Liu BC, Vladu ID, Mustafa R, Cana-Ruiu D, Vaduva C, Grauntanu C, Mota E, Singh R, Abbasian N, Stover C, Brunskill N, Burton J, Abbasian N, Herbert K, Bevington A, Brunskill N, Burton J, Wu M, Tang RN, Gao M, Liu H, Chen L, LV LL, Liu BC, Nikodimopoulou M, Liakos S, Kapoulas S, Karvounis C, Fedak D, Kuzniewski M, Paulina D, Kusnierz-Cabala B, Kapusta M, Solnica B, Sulowicz W, Junque A, Vicent ES, Moreno L, Fulquet M, Duarte V, Saurina A, Pou M, Macias J, Lavado M, Ramirez de Arellano M, Ryuzaki M, Nakamoto H, Kinoshita S, Kobayashi E, Takimoto C, Shishido T, Enia G, Torino C, Tripepi R, Panuccio V, Postorino M, Clementi A, Garozzo M, Bonanno G, Boito R, Natale G, Cicchetti T, Chippari A, Logozzo D, Alati G, Cassani S, Sellaro A, Zoccali C, Quiroga B, Verde E, Abad S, Vega A, Goicoechea M, Reque J, Lopez-Gomez JM, Luno J, Cabre Menendez C, Moles V, Vives JP, Villa D, Vinas J, Compte T, Arruche M, Diaz C, Soler J, Aguilera J, Martinez Vea A, De Mauri A, David P, Conte MM, Chiarinotti D, Ruva CE, De Leo M, Bargnoux AS, Morena M, Jaussent I, Chalabi L, Bories P, Dion JJ, Henri P, Delage M, Dupuy AM, Badiou S, Canaud B, Cristol JP, Fabbrini P, Sironi E, Pieruzzi F, Galbiati E, Vigano MR, Stella A, Genovesi S, Anpalakhan S, Anpalakhan S, Rocha S, Chitalia N, Sharma R, Kaski JC, Chambers J, Goldsmith D, Banerjee D, Cernaro V, Lacquaniti A, Lupica R, Lucisano S, Fazio MR, Donato V, Buemi M, Segalen I, Segalen I, Vinsonneau U, Tanquerel T, Quiniou G, Le Meur Y, Seibert E, Girndt M, Zohles K, Ulrich C, Kluttig A, Nuding S, Swenne C, Kors J, Werdan K, Fiedler R, Van der Weerd NC, Grooteman MP, Bots M, Van den Dorpel MA, Den Hoedt C, Nube MJ, Wetzels J, Swinkels DW, Blankestijn P, Ter Wee PM, Khandekar A, Khandge J, Lee JE, Moon SJ, Choi KH, Lee HY, Kim BS, Morena M, Tuaillon E, Jaussent I, Rodriguez A, Chenine L, Vendrell JP, Cristol JP, Canaud B, Sue YM, Tang CH, Chen YC, Sanchez-Perales C, Vazquez E, Segura P, Garcia Cortes MJ, Gil JM, Biechy MM, Liebana A, Poulikakos D, Shah A, Persson M, Banerjee D, Dattolo P, Amidone M, Amidone M, Michelassi S, Moriconi L, Betti G, Conti P, Rosati A, Mannarino A, Panichi V, Pizzarelli F, Klejna K, Naumnik B, Koc-Zorawska E, Mysliwiec M, Dimitrie S, Simona H, Mihaela O, Mugurel A, Gabriela O, Radu S, Octavian P, Adrian C, Akdam H, Akar H, Yenicerioglu Y, Kucuk O, Kurt Omurlu I, Goldsmith D, Thambiah S, Roplekar R, Manghat P, Manghat P, Fogelman I, Fraser W, Hampson G, Likaj E, Likaj E, Caco G, Seferi S, Rroji M, Barbullushi M, Thereska N, Onofriescu M, Hogas S, Luminita V, Mugurel A, Serban A, Carmen V, Cristian S, Silvia L, Covic A. Cardiovascular complications in CKD 5D. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs225] [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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Ryuzaki M, Ichihara A, Ohshima Y, Sakoda M, Kurauchi-Mito A, Narita T, Kinouchi K, Murohashi-Bokuda K, Nishiyama A, Itoh H. Involvement of activated prorenin in the pathogenesis of slowly progressive nephropathy in the non-clipped kidney of two kidney, one-clip hypertension. Hypertens Res 2010; 34:301-7. [DOI: 10.1038/hr.2010.230] [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] [Indexed: 11/09/2022]
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Ryuzaki M, Nishioka M, Kawamura T. Karyotypes of Rana tagoi Okada with diploid number 28 in the Chausu Mountains of the Minamishinshu district of Nagano Prefecture, Japan (Anura: Ranidae). Cytogenet Genome Res 2006; 114:56-65. [PMID: 16717451 DOI: 10.1159/000091929] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 09/30/2004] [Accepted: 07/08/2005] [Indexed: 11/19/2022] Open
Abstract
Karyotypes of Tago's brown frog Rana tagoi from the Chausu mountains in Minamishinshu of Nagano Prefecture were examined by conventional Giemsa staining, C-banding and late replication (LR)-banding. Chromosome number was 2n = 28 in all cases. The 28 chromosomes consisted of four pairs (1-4) of large biarmed chromosomes, two pairs (5-6) of telocentric chromosomes and eight pairs (7-14) of small biarmed chromosomes. Chromosome pair 11 had a secondary constriction on the long arm. In females, the C-band on the long arm of chromosome pair 6 was detected in both homologs, but was absent from the arms of the homologs of chromosome pairs 5 and 9. In males, C-bands were found in the long arms of both homologs of chromosome pairs 5 and 6, were present only in one homolog of chromosome pair 5 for certain male specimens and found in only one homolog of chromosome pair 9. Specimens of R. tagoi (2n = 28) should thus have two pairs of telocentric chromosomes to provide the same number of chromosome arms, these originating quite likely from chromosome pair 1 in the 26-chromosome specimens by centric fission. Heteromorphic sex chromosomes of the XX-XY type in R. tagoi (2n = 28) in the Chausu mountains were identified. Karyotypes of tail-tip cells from a hybrid tadpole between female R. tagoi (2n = 26) from the Hinohara village in Tokyo and male R. tagoi (2n = 28) from the Chausu mountain population were examined by squash preparation. Chromosome number was 2n = 27 in all tadpoles. The 27 chromosomes consisted of one chromosome set of R. tagoi (2n = 28) and one of R. tagoi (2n = 26).
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Affiliation(s)
- M Ryuzaki
- Department of Biology, Kitasato University School of Medicine, Sagamihara, Japan.
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Okada H, Ryuzaki M, Kotaki S, Nakamoto H, Sugahara S, Kaneko K, Yamamoto T, Kawahara H, Suzuki H. Thoracoscopic surgery and pleurodesis for pleuroperitoneal communication in patients on continuous ambulatory peritoneal dialysis. Am J Kidney Dis 1999; 34:170-2. [PMID: 10401034 DOI: 10.1016/s0272-6386(99)70126-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Two patients on continuous ambulatory peritoneal dialysis (CAPD) developed right massive hydrothorax and were diagnosed as having pleuroperitoneal communication. Thoracoscopic surgery and pleurodesis were performed. It showed that one was caused by multiple flaws in the diaphragm and that the other was attributable to multiple blebs in the diaphragmatic dome. After the procedure, both of them had no recurrence of hydrothorax and underwent CAPD safely. We recommend thoracoscopic surgery and pleurodesis as the first choice of therapeutic methods for pleuroperitoneal communication.
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Affiliation(s)
- H Okada
- Department of Nephrology, Saitama Medical College, Irumagun, Japan.
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Suzuki H, Nishizawa M, Ichikawa M, Kumagai K, Ryuzaki M, Kumagai H, Saruta T, Ikeda H. Basal sympathetic nerve activity is enhanced with augmentation of baroreceptor reflex in Wistar fatty rats: a model of obesity-induced NIDDM. J Hypertens 1999; 17:959-64. [PMID: 10419069 DOI: 10.1097/00004872-199917070-00012] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [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: 11/26/2022]
Abstract
AIM Wistar fatty rats (WFR) develop mild hypertension associated with obesity, hyperglycaemia and hyperinsulinaemia, and are thus assumed to be a good model of insulin resistance-related hypertension. We determined whether the activity of the sympathetic nervous system and its baroreflex-mediated regulation are involved in the development of hypertension in this strain. METHODS Renal sympathetic nerve activity (RSNA) was recorded in pre-hypertensive WFR (n = 8, age 12 weeks) and Wistar lean rats (WLR) (n = 8) during changes in arterial pressure by phenylephrine and nitroprusside infusion in the conscious state. Baroreflex control of RSNA and heart rate were examined by logistic function analysis. RESULTS The mean arterial pressure (MAP) of WFR was similar to that of WLR (108 +/- 4 versus 101 +/- 2 mmHg, not significant). Basal RSNA was elevated in WFR compared with WLR (86 +/- 2 versus 51 +/- 2% maximum, P< 0.01). Baroreflex control of RSNA was shifted to higher pressure levels (mid-range, 119 +/- 4 versus 99 +/- 4 mmHg, P < 0.05) in WFR compared with WLR, in spite of similar MAP. However, baroreflex sensitivity concerning RSNA was greater in WFR than WLR (3.07 +/- 0.15 versus 1.63 +/- 0.12% maximum/mmHg, P < 0.01). Baroreflex control of heart rate was also shifted to higher pressure levels (mid-range 129 +/- 4 versus 100 +/- 5 mmHg, P < 0.01) and its sensitivity was increased in WFR compared with WLR (4.62 +/- 0.51 versus 3.16 +/- 0.10 bpm/mmHg, P< 0.05). CONCLUSION These results suggest that baroreflex is not impaired in spite of elevation of blood pressure and that the raised sympathetic nerve activity may contribute to the development of hypertension in WFR.
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Affiliation(s)
- H Suzuki
- Department of Nephrology, Saitama Medical School, Saitama Prefecture, Japan
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Ryuzaki M, Hanada H, Okumoto H, Takizawa N, Nishioka M. Evidence for heteromorphic sex chromosomes in males of Rana tagoi and Rana sakuraii in Nishitama district of Tokyo (Anura: Ranidae). Chromosome Res 1999; 7:31-42. [PMID: 10219730 DOI: 10.1023/a:1009271110980] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [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: 11/12/2022]
Abstract
Karyotypes of the Tago brown frog Rana tagoi and stream Tago brown frog Rana sakuraii from a mountain region in the Nishitama district in Tokyo were examined by conventional Giemsa staining, C-banding and late replication (LR)-banding. Chromosome number was 2n = 26 in all cases. The 26 chromosomes consisted of five (1-5) pairs of large chromosomes and eight (6-13) pairs of small chromosomes. Chromosome 10 had a secondary constriction on the long arm. In all frogs, on chromosome pair 8, the XX/XY type sex chromosome was present. C-banding analysis indicated that, in R. sakuraii, neither the X nor Y chromosome possessed interstitial C-bands but each had centromere staining, while in R. tagoi, an interstitial C-band was present on the long arm of the X chromosome. The Y chromosome had no interstitial C-band. LR-banding analysis demonstrated the X and Y chromosomes to have a LR-band on the short arm and two LR-bands, each on the long arm, and the bands on both species to be essentially the same. Heteromorphic sex chromosomes in males of R. sakuraii and R. tagoi were identified for the first time in this study.
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Affiliation(s)
- M Ryuzaki
- Department of Biology, Kitasato University School of Medicine, Sagamihara, Japan.
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Abstract
We postulate that the sympathoexcitatory response associated with the immunosuppressive agent cyclosporin A is due to an upward resetting of the arterial baroreflex. We performed studies in conscious intact and sinoaortic-denervated rabbits instrumented with catheters and renal nerve electrodes. In intact rabbits, cyclosporin A (20 mg/kg i.v., 30 minutes) produced significant increases in renal sympathetic nerve activity (100% to 269 +/- 74%, P < .05) but did not increase mean arterial pressure. In intact rabbits, we determined arterial baroreflex curves relating renal sympathetic nerve activity and heart rate to mean arterial pressure by producing ramp increases (intravenous phenylephrine) and decreases (intravenous nitroprusside) in mean arterial pressure. Cyclosporin A treatment produced a shift of the midrange of the baroreflex control of heart rate (78.0 +/- 4.1 to 84.6 +/- 4.7 mm Hg, P < .05) and renal sympathetic nerve activity (74.6 +/- 3.9 to 87.0 +/- 4.8 mm Hg, P < .05). Vehicle administration produced no effects on arterial baroreflex curves relating renal sympathetic nerve activity and heart rate to mean arterial pressure. Compared with vehicle treatment, cyclosporin A reduced the maximum gain of heart rate (-5.6 +/- 0.6 versus -3.1 +/- 0.8 beats per minute per millimeter of mercury, P < .05) but had no effect on the maximum gain of renal sympathetic nerve activity. In conscious sinoaortic-denervated rabbits, cyclosporin A had no effect on mean arterial pressure (95.7 +/- 7.3 to 91.8 +/- 10.8 mm Hg), renal sympathetic nerve activity (100% to 110 +/- 6%). and heart rate (287 +/- 10 to 279 +/- 8 beats per minute). However, when the same sinoaortic-denervated rabbits were anesthetized with sodium pentobarbital, cyclosporin A (20 mg/kg i.v.) produced increases in renal sympathetic nerve activity (100% to 189 +/- 27%). These data indicate (1) that the sympathoexcitatory response to cyclosporin A depends on baroreceptor afferent input in the conscious state and (2) that this response involves an upward resetting of the arterial baroreflex.
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Affiliation(s)
- M Ryuzaki
- Kidney Disease Medical Center, Saitama (Japan) Medical School
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Kumagai K, Suzuki H, Ichikawa M, Jimbo M, Nishizawa M, Ryuzaki M, Saruta T. Comparison of early and late start of antihypertensive agents and baroreceptor reflexes. Hypertension 1996; 27:209-18. [PMID: 8567043 DOI: 10.1161/01.hyp.27.2.209] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [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: 01/31/2023]
Abstract
Along with arterial blood pressure reduction, maintenance of the integrity of baroreceptor reflex function contributes to preserving end-organ function in the treatment of hypertensive patients. The purpose of this study was to investigate the effects of antihypertensive agents (trichlormethiazide, atenolol, nicardipine, and enalapril) on baroreceptor reflex function by comparing early and late starts of treatment. We administered each agent to spontaneously hypertensive rats (SHR) as early-start groups from 10 to 36 weeks of age and as late-start groups from 28 to 36 weeks of age. We evaluated the gain of the reflex control of renal sympathetic nerve activity and heart rate using ramp infusions of phenylephrine and nitroglycerin in untreated SHR at 10, 28, or 36 weeks of age and in treated SHR at 36 weeks of age. In 28- and 36-week-old untreated SHR, the renal sympathetic nerve activity gain was not altered and the heart rate gain was decreased (from -2.3 +/- 0.3 to -1.3 +/- 0.3 and -1.2 +/- 0.3 beats per minute [bm]/mm Hg, P < .05, respectively) compared with 10-week-old SHR. Early and late start of therapy produced arterial pressure reductions (-18 +/- 4 and -12 +/- 5 mm Hg, P < .05, respectively). In the early-start groups, the renal sympathetic nerve activity gain was improved markedly in nicardipine- and enalapril-treated SHR (-4.2 +/- 0.2% and -4.9 +/- 0.2% of control/mm Hg, P < .01, respectively), and the heart rate gain was improved markedly in atenolol- and enalapril-treated SHR (-4.1 +/- 0.2 and -4.4 +/- 0.2 bpm/mm Hg, P < .01, respectively). In the late-start groups, the renal sympathetic nerve activity gain was improved moderately in nicardipine- and enalapril-treated SHR (-3.8 +/- 0.2% and -2.9 +/- 0.2% of control/mm Hg, P < .05, respectively). The heart rate gain was improved slightly only in nicardipine-treated SHR (-1.9 +/- 0.2 bpm/mm Hg, P < .05). These results demonstrate that an early start of antihypertensive treatment improves baroreceptor reflex function markedly compared with a late start of treatment. This supports the hypothesis that a possible critical phase sensitive to intervention with antihypertensive treatment exists during the development of hypertension and indicates that the early start of antihypertensive treatment would be required in clinical practice.
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Affiliation(s)
- K Kumagai
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
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Ohishi A, Suzuki H, Nakamoto H, Katsumata H, Hayashi K, Ryuzaki M, Kumagai K, Furukawa T, Ichihara A, Saruta T. Status of patients who underwent uninephrectomy in adulthood more than 20 years ago. Am J Kidney Dis 1995; 26:889-97. [PMID: 7503062 DOI: 10.1016/0272-6386(95)90052-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [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: 01/25/2023]
Abstract
We investigated the status of patients without systemic diseases who had undergone uninephrectomy for unilateral renal diseases in adulthood more than 20 years ago at Tokyo Denryoku Hospital. There were 21 participants (mean age +/- SD, 58.6 +/- 8.0 years) who fulfilled these criteria. The average interval since nephrectomy was 27.9 +/- 6.2 years. The mean current creatinine clearance was 88.5 +/- 21.2 mL/min/1.73 m2, which is 92.9% of that in healthy age- and sex-matched controls with two kidneys. The 24-hour urine protein excretion in these patients was only slightly higher than in the controls (214 +/- 190 mg v 119 +/- 62 mg, P = NS). Age at nephrectomy, length of time with a single kidney, or sex had little effect on the remnant renal functions. There was a positive correlation between current mean arterial pressure and serum creatinine (r = 0.44, P < 0.05). Patients who developed hypertension after uninephrectomy had a family history of hypertension more frequently than those with normotension (86% v 29%, P < 0.05). We conclude that (1) renal function after compensatory hyperfiltration of more than 20 years due to uninephrectomy for unilateral renal diseases in adulthood is well maintained, although hypertension has a considerable effect on the renal functions, and that (2) family history of hypertension plays a key role in determining the incidence of hypertension even in the uninephrectomized patients.
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Affiliation(s)
- A Ohishi
- Department of Internal Medicine, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan
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Ichikawa M, Suzuki H, Kumagai K, Ryuzaki M, Kumagai H, Nishizawa M, Saruta T. Baroreceptor function is restored by antihypertensive therapy through lowering of blood pressure in adult SHR. Clin Exp Pharmacol Physiol Suppl 1995; 22:S67-9. [PMID: 9072447 DOI: 10.1111/j.1440-1681.1995.tb02973.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
1. We investigated the effects of antihypertensive treatment (8 weeks) with four different agents (trichlormethiazide, atenolol, nicardipine and enalapril) on baroreceptor function in 28 week old spontaneously hypertensive rats (SHR) to measure aortic depressor nerve (ADN) activity. 2. Threshold pressure (Pth) of ADN activity was elevated and the gain sensitivity of the pressure-activity curve, as determined by the maximum gain (Gmax) of a logistic function curve, was depressed in untreated SHR compared to those in untreated Wistar-Kyoto (WKY) rats. 3. Treatment with the four agents similarly reduced blood pressure in SHR. Each of the four agents induced a decrease in Pth and an increase in Gmax to a similar extent in SHR. 4. These findings suggest that antihypertensive therapy in chronic hypertension augments baroreceptor function through the lowering of blood pressure but not through specific pharmacological actions.
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Affiliation(s)
- M Ichikawa
- Department of Internal Medicine, Keio University, School of Medicine, Tokyo, Japan
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Ichikawa M, Suzuki H, Kumagai K, Kumagai H, Ryuzaki M, Nishizawa M, Saruta T. Differential modulation of baroreceptor sensitivity by long-term antihypertensive treatment. Hypertension 1995; 26:425-31. [PMID: 7649577 DOI: 10.1161/01.hyp.26.3.425] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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: 01/26/2023]
Abstract
We investigated the effects of long-term oral treatment with four different classes of antihypertensive drugs (a thiazide diuretic [trichlormethiazide, 10 mg/kg per day]; a beta-blocker [atenolol, 90 mg/kg per day]; a calcium channel antagonist [nicardipine, 150 mg/kg per day]; and an angiotensin-converting enzyme inhibitor [enalapril maleate, 10 mg/kg per day]) on aortic baroreceptor activity in spontaneously hypertensive rats with chronic hypertension (36 weeks of age). Treatment with each of the four drugs, given from 10 to 36 weeks of age, similarly decreased arterial pressure (171 +/- 2 to 144 +/- 1 mm Hg, P < .01) and similarly decreased the threshold pressure for baroreceptors (116 +/- 3 to 103 +/- 1 mm Hg, P < .05). The four antihypertensive drugs also potentiated the maximal gain of the pressure-activity relation in these rats (untreated, 1.08 +/- 0.05% maximum/mm Hg); however, nicardipine and enalapril (1.77 +/- 0.04% and 1.70 +/- 0.06% maximum/mm Hg, respectively) augmented the maximal gain to a greater extent (P < .05 to .01) than did trichlormethiazide or atenolol (1.49 +/- 0.05% and 1.42 +/- 0.02% maximum/mm Hg, respectively). When the initiation of treatment was delayed to 28 weeks of age, no differences were found in the effects on either threshold pressure (104 +/- 1 mm Hg) or maximal gain (1.36 +/- 0.03% maximum/mm Hg) for all four drugs.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- M Ichikawa
- Department of Internal Medicine, Keio University, School of Medicine, Tokyo, Japan
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Kumagai H, Suzuki H, Ichikawa M, Nishizawa M, Ryuzaki M, Kumagai K, Saruta T. Different responses of renal blood flow and sympathetic nerve activity to captopril and nicardipine in conscious renal hypertensive rabbits. J Cardiovasc Pharmacol 1995; 25:57-64. [PMID: 7723354 DOI: 10.1097/00005344-199501000-00010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
To elucidate the roles of endogenous angiotensin II (AII) and renal sympathetic nerve activity (RSNA) in modulation of renal blood flow (RBF), we recorded RBF and RSNA in conscious two-kidney, one-clip (2K1C) hypertensive rabbits with blood pressure (BP) reduced to a similar extent by captopril (5 mg/kg) and nicardipine (4.3 micrograms/kg/min). We measured plasma concentrations of AII, arginine vasopressin (AVP), and norepinephrine (NE). Despite comparable depressor effects, changes in RBF showed different profiles with the two drugs in renal hypertensive rabbits. After captopril injection, RBF was consistently increased to 143 +/- 7%. In contrast, with nicardipine infusion, RBF was initially increased to 114 +/- 5% and then significantly decreased to 86 +/- 4%. The increase in RSNA was greater with captopril than with nicardipine. Plasma concentration of AII was decreased with captopril but significantly increased with nicardipine. In sham-clipped normotensive rabbits in which plasma AII was not increased, RBF was not reduced with nicardipine. Thus, vasoconstrictor actions of RSNA and increased AII may have overcome the vasodilatory effect of nicardipine in conscious renal hypertensive rabbits. Because the increase in RSNA was smaller with nicardipine, we speculate that the vasoconstriction induced by AII, as well as background BP level, played a substantial role in determining RBF.
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Affiliation(s)
- H Kumagai
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
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Abstract
Angiotensin II (ANG II)-dependent hypertension involves the resetting of the heart rate (HR) and sympathetic baroreflex toward higher pressures in conscious rabbits. The resetting of the HR baroreflex function occurs within minutes of the administration of ANG II, while the resetting of the sympathetic baroreflex requires several days. In conscious rabbits, an intact area postrema (AP) is required for the resetting of either the HR or sympathetic baroreflex function. Data is also presented showing that pretreatment with an alpha-1 adrenergic receptor antagonist prevents the early resetting of the HR baroreflex.
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Affiliation(s)
- V S Bishop
- Department of Physiology, University of Texas Health Science Center, San Antonio 78284-7756, USA
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Ichikawa M, Suzuki H, Kumagai K, Ryuzaki M, Kumagai H, Jimbo M, Nishizawa M, Saruta T. Effects of antihypertensive agents on baroreceptor function in early hypertensive rats. Hypertension 1994; 24:808-15. [PMID: 7995641 DOI: 10.1161/01.hyp.24.6.808] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [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: 01/28/2023]
Abstract
To investigate the effects of antihypertensive treatment with four currently used agents (trichlormethiazide, atenolol, nicardipine, and enalapril) on the arterial baroreceptor function at the early phase of hypertension, we administered the agents to spontaneously hypertensive rats and Wistar-Kyoto rats from 8 to 10 weeks of age and examined the aortic nerve activity function. In untreated spontaneously hypertensive rats, the relation between the arterial pressure and aortic nerve activity was shifted to the right, that is, to a higher pressure level (threshold pressure, 90 +/- 3 versus 76 +/- 1 mm Hg, P < .05), and the maximum gain which was obtained by logistic function analysis was depressed (1.55 +/- 0.08% versus 2.18 +/- 0.13% maximum/mm Hg, P < .01) as compared with untreated Wistar-Kyoto rats. An equivalent decrease in arterial pressure with each of the four agents (-20 +/- 1 mm Hg, P < .01) produced a leftward shift of the arterial pressure-aortic nerve activity relation to a similar extent (threshold pressure, 77 +/- 1 mm Hg, P < .05) in spontaneously hypertensive rats. In addition, treatment with the four agents equally augmented the maximum gain in spontaneously hypertensive rats (2.13 +/- 0.09% maximum/mm Hg, P < .05). The antihypertensive agents affected neither the blood pressure nor the aortic nerve activity in Wistar-Kyoto rats. These findings suggest that antihypertensive treatment with the four classes of agents equally enhances the arterial baroreceptor function through blood pressure reduction but not through specific depressor mechanisms at the early stage of hypertension.
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Affiliation(s)
- M Ichikawa
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
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Kumagai K, Suzuki H, Ichikawa M, Jimbo M, Murakami M, Ryuzaki M, Saruta T. Nitric oxide increases renal blood flow by interacting with the sympathetic nervous system. Hypertension 1994; 24:220-6. [PMID: 8039847 DOI: 10.1161/01.hyp.24.2.220] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [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: 01/28/2023]
Abstract
To investigate whether changes in renal blood flow induced by nondepressor doses of L-arginine, the precursor of nitric oxide, are mediated by a sympathetic neural mechanism, we examined the following in conscious rabbits: (1) the effects of intravenous infusion of L- or D-arginine (15 to 200 mumol/kg per minute) on renal blood flow and renal sympathetic nerve activity with or without intravenous infusion of a nonpressor dose of NG-monomethyl-L-arginine (L-NMMA), a nitric oxide synthase inhibitor, and (2) the effects of L-arginine on renal blood flow after renal denervation with or without L-NMMA pretreatment. In renal innervated rabbits, L-arginine (100 and 200 mumol/kg per minute) increased renal blood flow by 9 +/- 2 and 16 +/- 3 mL/min (P < .05, respectively) and decreased renal sympathetic nerve activity by 12 +/- 4% and 19 +/- 3% of control (P < .05, respectively). In contrast, no changes occurred in any variable during D-arginine infusion. L-NMMA attenuated the renal blood flow and renal sympathetic nerve activity responses to L-arginine (P < .05). In renal denervated rabbits, L-NMMA also attenuated the renal blood flow responses to L-arginine (P < .05) and abolished them (P < .05) compared with those in renal innervated rabbits. All renal blood flow responses to L-arginine were accompanied by parallel changes in plasma L-citrulline concentration.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- K Kumagai
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
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Kumagai H, Suzuki H, Ichikawa M, Matsumura Y, Jimbo M, Ryuzaki M, Saruta T. Central and peripheral vasopressin interact differently with sympathetic nervous system and renin-angiotensin system in renal hypertensive rabbits. Circ Res 1993; 72:1255-65. [PMID: 8495554 DOI: 10.1161/01.res.72.6.1255] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
This study was designed to elucidate how central and peripheral arginine vasopressin (AVP) interacts with the sympathetic nervous system and the renin-angiotensin system to maintain blood pressure in two-kidney, one-clip hypertensive rabbits. We recorded renal sympathetic nerve activity (RSNA) in the conscious state as an index of sympathetic nervous system function. The changes in mean arterial pressure, heart rate, and RSNA were recorded continuously for 60 minutes after intravenous administrations of captopril (2.5 mg/kg) and nicardipine (3.2 micrograms.kg-1.min-1) in eight identical rabbits. Despite equivalent reductions in mean arterial pressure (10 +/- 1 mm Hg), the increase in RSNA was significantly larger with captopril than that with nicardipine, and the plasma concentration of AVP was elevated (from 100% to 255 +/- 24%) with captopril. Mean arterial pressure was reduced, and RSNA was increased by intravenous infusion of AVP antagonist d(CH2)5Tyr(Me)AVP (n = 8), whereas vertebral artery infusion of the antagonist (n = 6) did not change RSNA. During central and peripheral infusions of AVP antagonist, RSNA was exaggerated by blood pressure reduction with nicardipine as well as with captopril. Increases in RSNA induced by captopril and nicardipine were larger by central infusion of AVP antagonist than by intravenous infusion. The decrease in mean arterial pressure by captopril (30 +/- 4 mm Hg) in eight sinoaortic-denervated hypertensive rabbits was larger than that in hypertensive rabbits with intact baroreflex. These data suggest that compensatory activation of RSNA was revealed by central and peripheral attenuation of AVP and that the sympathetic nervous system became the most important mechanism for blood pressure maintenance in the absence of AVP. The interaction of AVP with the sympathetic nervous system may be independent of the state of the renin-angiotensin system, since the exaggeration of RSNA by AVP antagonist was qualitatively the same with nicardipine as with captopril. In conscious renal-hypertensive rabbits, AVP in the central nervous system played a substantial role when blood pressure was reduced, although it did not contribute to blood pressure maintenance in the basal condition.
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Affiliation(s)
- H Kumagai
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
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Oonuki M, Ryuzaki M. Cortical photons in early development of frog eggs: comparative study of photon emission between nuclear division and cytoplasmic fission. J Cell Physiol 1992; 153:518-22. [PMID: 1447312 DOI: 10.1002/jcp.1041530311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 12/27/2022]
Abstract
In the study of cell division in the early development of frog eggs, cortical photon emission was investigated by converting small light emission from living cells into digital pulses of potentials and recording the integrals of these pulses (analog method), counting the number of pulses (photon-counting method), and counting the number of integrated pulses (improved photon-counting method). By the analog and improved photon-counting methods, changes in photon emission due to cell division could be clearly detected. The emitted light increased about 5.10(-19)W at the start of a cleavage furrow. Rapid changes in chemical reactions causing photon emission were compared during nuclear division and cytoplasmic phases. This emission occurred mainly in cytoplasmic fission, the rate being greater than in nuclear division by a factor of about 2.9. Chemical reaction rates were shown to differ according to bulk emission, thus indicating the mechanisms for the reactions to also differ.
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Affiliation(s)
- M Oonuki
- Department of Physiology and Biology, School of Medicine, Kitasato University, Kanagawa, Japan
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Kumagai H, Suzuki H, Matsumura Y, Ryuzaki M, Saruta T. Differential effects of captopril and nicardipine on baroreflex control of sympathetic nerve activity and heart rate in renal hypertension. J Hypertens 1992; 10:1485-91. [PMID: 1338079 DOI: 10.1097/00004872-199210120-00008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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: 12/26/2022]
Abstract
OBJECTIVE To test the hypothesis that an angiotensin I converting enzyme inhibitor and a calcium channel blocker have different effects on the arterial baroreflex in renal hypertension. DESIGN AND METHODS We examined the baroreflex control of renal sympathetic nerve activity and heart rate before and after blood pressure was reduced by a similar magnitude (11 +/- 1 mmHg) with intravenous captopril or nicardipine in two-kidney, one clip hypertensive (mean arterial pressure 92 +/- 2 mmHg, n = 12) and normotensive rabbits (mean arterial pressure 75 +/- 1 mmHg, n = 9) in the conscious state. Data obtained during activation and deactivation of baroreceptors were analysed with logistic function curves, and the maximum slope of the curve was taken as the sensitivity of the baroreflex. RESULTS The maximum slopes of the curves relating mean arterial pressure to renal sympathetic nerve activity and to the heart rate in hypertensive rabbits were significantly smaller than the maximum slopes in normotensive rabbits. In renal hypertensive rabbits, the maximum slope of the mean arterial pressure-renal sympathetic nerve activity curve was increased with captopril compared with that with vehicle. In contrast, the maximum slope of the mean arterial pressure-heart rate curve was increased with nicardipine compared with that with vehicle. CONCLUSIONS Our data indicating that the baroreflex control of renal sympathetic nerve activity was improved by captopril and that baroreflex control of the heart rate was potentiated by nicardipine suggest that these classes of antihypertensive agents had differential effects in conscious hypertensive rabbits.
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Affiliation(s)
- H Kumagai
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
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Kumagai K, Suzuki H, Ryuzaki M, Kumagai H, Ichikawa M, Jimbo M, Matsumura Y, Saruta T. Effects of antihypertensive agents on arterial baroreceptor reflexes in conscious rats. Hypertension 1992; 20:701-9. [PMID: 1428118 DOI: 10.1161/01.hyp.20.5.701] [Citation(s) in RCA: 20] [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: 12/27/2022]
Abstract
The effects of antihypertensive treatment with four currently used agents (trichlormethiazide, atenolol, nicardipine, and enalapril) on the arterial baroreceptor reflex control of renal sympathetic nerve activity and heart rate were investigated in 45 conscious spontaneously hypertensive rats and 37 age-matched Wistar-Kyoto rats. Antihypertensive agents were administered for 2 weeks beginning at 8 weeks of age to treat and prevent the development of hypertension. Blood pressure was reduced to a similar level (-13 +/- 3 mm Hg, p < 0.05) by each antihypertensive agent. Blood pressure, heart rate, and renal sympathetic nerve activity were recorded in the conscious state during phenylephrine and nitroglycerin ramp infusion. The gain in the baroreceptor reflex was determined from the maximum slope of logistic function curves. Untreated spontaneously hypertensive rats exhibited decreased sensitivity of reflex control of renal sympathetic nerve activity and heart rate (-1.78 +/- 0.07% of control/mm Hg and -2.16 +/- 0.05 beats per minute/mm Hg, respectively) compared with untreated Wistar-Kyoto rats (-3.62 +/- 0.18% of control/mm Hg, p < 0.01, and -3.46 +/- 0.11 beats per minute/mm Hg, p < 0.05, respectively).(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- K Kumagai
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
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Abstract
Emission of light was detected from the surface of embryos of the frog, Rana japonica, during early cleavage by a photon counting and an "analog separation (integrated photons) method". The light-emission from an egg was more than 5.6 x 10(-19) W at the beginning of the first cleavage.
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Affiliation(s)
- M Oonuki
- Deparment of Physiology, School of Medicine, Kitasato University, Kanagawa, Japan
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Ryuzaki M, Suzuki H, Kumagai K, Kumagai H, Ichikawa M, Matsukawa S, Matsumura Y, Saruta T. Renal nerves contribute to salt-induced hypertension in sinoaortic-denervated uninephrectomized rabbits. Am J Physiol 1992; 262:R733-7. [PMID: 1590468 DOI: 10.1152/ajpregu.1992.262.5.r733] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The objective of this study was to investigate the role of the renal nerves in the pathogenesis of salt-induced hypertension in sinoaortic-denervated uninephrectomized rabbits. Twelve rabbits were divided into two groups. Sinoaortic-denervated uninephrectomized rabbits with intact renal nerves (sham group: n = 6) and without renal nerves (RDN group; n = 6). In both groups, 2 days of 154 meq/l NaCl loading was followed by 10 days of 1,700 meq/l NaCl loading. We administered 154 meq/l or 1,700 meq/l NaCl intravenously at every 8 h. Serial changes in mean arterial pressure (MAP) and heart rate (HR) were recorded using a microcomputer system. We chronologically measured hematocrit, serum osmolality, serum sodium, potassium, and chloride concentration, serum creatinine, plasma renin activity, plasma aldosterone, plasma norepinephrine, plasma arginine vasopressin, and plasma atrial natriuretic peptide. Urine volume and body weight were recorded every day, as were urinary concentrations of sodium, potassium, and chloride. The basal value of MAP in the sham group was significantly higher than that in the RDN group (on day -2, 111 +/- 1 mmHg for sham, 99 +/- 2 for RDN, P less than 0.001). Hypertonic saline loading induced an elevation of blood pressure in the sham group (126 +/- 2 mmHg on day 4, 127 +/- 2 on day 7, 124 +/- 4 on day 10). There were no significant changes in the response to salt loading in the RDN group. In the sham group, the retention of sodium was significant compared with that in the RDN group on day 5, and this difference was maintained until the end of the experiments.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- M Ryuzaki
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
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Ryuzaki M, Suzuki H, Kumagai K, Kumagai H, Ichikawa M, Matsumura Y, Saruta T. Role of vasopressin in salt-induced hypertension in baroreceptor-denervated uninephrectomized rabbits. Hypertension 1991; 17:1085-91. [PMID: 2045153 DOI: 10.1161/01.hyp.17.6.1085] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [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: 12/30/2022]
Abstract
To elucidate the contributions of renal, humoral, and arterial baroreceptor reflex components to salt-induced hypertension, we administered 10% NaCl intravenously for 10 days to sinoaortic-denervated rabbits with unilateral nephrectomy (n = 7), sinoaortic-denervated rabbits with intact kidneys (n = 7), and sham-operated sinoaortic-denervated rabbits with unilateral nephrectomy (n = 7). Serial changes in mean arterial pressure (MAP), heart rate, and blood pressure variability were recorded. In sinoaortic-denervated rabbits with unilateral nephrectomy, MAP increased significantly from 109 +/- 2 to 124 +/- 3 mm Hg (day 4) and remained elevated for the rest of the experiment. This elevation of MAP was accompanied by a reduction in the standard deviation of MAP, with significant elevations in plasma vasopressin, norepinephrine, and atrial natriuretic peptide concentrations and in sodium retention. In the other groups, there were no significant changes in these vasoactive hormones. In the sham-operated sinoaortic-denervated rabbits with unilateral nephrectomy, sodium retention was similar to that of sinoaortic-denervated rabbits with unilateral nephrectomy. Continuous infusion (1 microgram/kg/hr) of a V1 antagonist prevented the elevation of blood pressure and plasma norepinephrine, the accumulation of sodium, and the reduction of blood pressure lability, whereas a bolus injection (10 micrograms/kg) on day 4 reduced blood pressure from 128 +/- 3 to 115 +/- 2 mm Hg (p less than 0.005). These results imply that vasopressin plays a crucial role in the expression of salt-induced hypertension in rabbits with compromised baroreceptor and renal function.
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Affiliation(s)
- M Ryuzaki
- Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
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Sasamura H, Nakamoto H, Ryuzaki M, Kumagai K, Abe S, Suzuki H, Hirakata M, Tojo T, Handa M, Yamamoto M. Repeated intestinal ulcerations in a patient with systemic lupus erythematosus and high serum antiphospholipid antibody levels. South Med J 1991; 84:515-7. [PMID: 2014444 DOI: 10.1097/00007611-199104000-00030] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [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: 12/29/2022]
Abstract
We report the case of a patient with SLE who had repeated ulceration of the small intestine requiring emergency surgery. Pathologic examination revealed microthrombosis and vasculitis at the site of the intestinal ulcers. High levels of antiphospholipid antibodies, thrombocytopenia, and prolonged prothrombin time coincided with the episodes of intestinal ulceration. Antiphospholipid antibodies may be involved in the development of thrombosis resulting in the repeated episodes of intestinal ulceration in this patient. This possibility should be considered in patients with SLE who have intestinal ulceration and appropriate antithrombotic medication should be administered.
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Affiliation(s)
- H Sasamura
- Department of Internal Medicine, Keio University, Tokyo, Japan
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Kumagai H, Suzuki H, Ryuzaki M, Matsukawa S, Saruta T. Baroreflex control of renal sympathetic nerve activity is potentiated at early phase of two-kidney, one-clip Goldblatt hypertension in conscious rabbits. Circ Res 1990; 67:1309-22. [PMID: 2245497 DOI: 10.1161/01.res.67.6.1309] [Citation(s) in RCA: 21] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Conscious normotensive and two-kidney, one-clip Goldblatt hypertensive rabbits were studied to determine the sensitivity of the arterial baroreflex control of renal sympathetic nerve activity (RSNA) and heart rate. The relations of the mean arterial pressure-RSNA and mean arterial pressure-heart rate were examined over a wide range of blood pressures produced by infusions of phenylephrine and nitroglycerin. The maximum slope obtained by logistic function analysis was considered to represent the baroreflex sensitivity. In the early hypertensive group (n = 8; mean arterial pressure +/- SEM, 88 +/- 2 mm Hg) on day 5 after renal clip application, the maximum slope of the mean arterial pressure-RSNA relation was -11.3 +/- 1.2, which was significantly greater than that of the sham normotensive group (-6.9 +/- 0.3, p less than 0.05). The maximum slope (-4.3 +/- 0.2) of the mean arterial pressure-RSNA relation in the late hypertensive group (n = 8; mean arterial pressure, 96 +/- 3 mm Hg) on day 21 after renal clipping was significantly smaller than that of another sham group (-7.2 +/- 0.2, p less than 0.05). In contrast to these changes in the baroreflex control of RSNA, the control of heart rate was attenuated according to the magnitude of mean arterial pressure. To elucidate the mechanisms underlying the potentiated baroreflex, the effects of endogenous neuropeptides were investigated. First, plasma concentrations of angiotensin II and arginine vasopressin that are known to affect the baroreflex were determined. Plasma concentrations of vasopressin (3.1 +/- 0.6 pg/ml) as well as of angiotensin II (34 +/- 7 pg/ml) were increased in the early hypertensive group, and the plasma vasopressin returned to a similar level to the sham group in the late hypertensive group (1.3 +/- 0.4 pg/ml). Second, to study endogenous effects of these neuropeptides on the baroreflex, the maximum slopes of the baroreflex curves during infusions of antagonists for the peptides were determined in the early hypertensive group. The maximum slope of mean arterial pressure-RSNA during intravertebral arterial [Sar1, Ala8]-angiotensin II (-16.4 +/- 1.5) was significantly greater (p less than 0.05), whereas the maximum slope during intravertebral arterial infusion of d(CH2)5Tyr(Me)arginine vasopressin (-4.7 +/- 0.5) was significantly smaller (p less than 0.05) than that during vehicle infusion (-11.3 +/- 1.2).(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- H Kumagai
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
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Kumagai H, Suzuki H, Matsukawa S, Ryuzaki M, Saruta T. Captopril therapy following percutaneous transluminal angioplasty for bilateral renal artery stenosis. Arch Intern Med 1989; 149:1973-6. [PMID: 2528335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
To establish an optimal approach for the patients with bilateral atherosclerotic renal artery stenosis, combined treatment involving percutaneous transluminal renal angioplasty and oral captopril was applied. Five patients were examined for effects of the combined treatment on blood pressure and renal function. After percutaneous transluminal renal angioplasty on one renal artery, the blood pressure (mean +/- SD) fell from 210/118 +/- 26/8 to 176/104 +/- 11/9 mm Hg without any deterioration of renal function. This reduced blood pressure was further lowered to 155/92 +/- 6/3 mm Hg by adding captopril therapy. This level of blood pressure has been maintained for an average of 37 months. Significant increases in serum creatinine concentration were not observed (124 +/- 27 vs 141 +/- 44 mumol/L), and renal size has been sustained. These results indicate that combined treatment with percutaneous transluminal renal angioplasty and captopril is effective in reducing the blood pressure and preserving renal function as an approach for the patients with bilateral atherosclerotic renal artery stenosis.
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Affiliation(s)
- H Kumagai
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
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Ryuzaki M, Konishi K, Kasuga A, Kumagai H, Suzuki H, Abe S, Saruta T, Takami H, Tashiro M. Spontaneous rupture of the quadriceps tendon in patients on maintenance hemodialysis--report of three cases with clinicopathological observations. Clin Nephrol 1989; 32:144-8. [PMID: 2791366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Three patients receiving maintenance hemodialysis therapy for end-stage renal failure presented with spontaneous rupture of the quadriceps tendon(s). Biochemical data and the skeletal roentgenograms were compatible with secondary hyperparathyroidism. Histological examination of the excised quadriceps tendon specimens suggested that repeated minor avulsion fractures of the bone cortex at the tendon insertion site had preceded the final total tendon rupture and that osteitis fibrosa was responsible for these minor fractures. Serum alkaline phosphatase level had been increasing continuously for approximately five years prior to the tendon rupture in all three patients, indicating that uncontrolled osteitis fibrosa due to secondary hyperparathyroidism over these years preceded the tendon rupture.
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Affiliation(s)
- M Ryuzaki
- Department of Medicine, School of Medicine, Keio University, Tokyo, Japan
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Miyachi H, Ryuzaki M, Shiraishi M, Nogami W, Furusugi Y, Katayama T. [A case of systemic lupus erythematosus with renal vein thrombosis as the initial manifestation]. Nihon Naika Gakkai Zasshi 1986; 75:964-8. [PMID: 3783002 DOI: 10.2169/naika.75.964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Ryuzaki M. Positional distribution of constituent fatty acids in phosphatidylethanolamine during early development in Rana nigromaculata. Comp Biochem Physiol B 1986; 84:441-5. [PMID: 3757478 DOI: 10.1016/0305-0491(86)90103-3] [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: 01/07/2023]
Abstract
Qualitative and quantitative changes in phosphatidylethanolamine (PE) were analyzed in the eggs, embryos and tadpoles of the Japanese pond frog, Rana nigromaculata, at various stages of development. The weight percentage of PE to total phospholipid and to total lipid was about 15-18% and about 3-4%, respectively, during embryonic life. At all stages from the unfertilized egg to the feeding tadpole, the major fatty acids at the 1-position of PE were palmitic, stearic and oleic acids. At the 2-position, arachidonic, oleic, palmitic, stearic and linoleic acids were present during embryonic life. The most abundant fatty acid at the 2-position was arachidonic acid at the unfertilized egg and hatching embryo stages. However, palmitic acid was the most prevalent 2-fatty acid at the posthatching tadpole and the feeding tadpole stages. Thus, there were marked changes in the positional distribution of the constituent fatty acids in PE during development.
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Seshimo H, Ryuzaki M, Yoshizato K. Specific inhibition of Triiodothyronine-induced tadpole tail-fin regression by cathepsin D-inhibitor pepstatin. Dev Biol 1977; 59:96-100. [PMID: 302228 DOI: 10.1016/0012-1606(77)90244-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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50
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Ryuzaki M, Kojima H, Tamai Y. Study on amphibian lipids--II. Characteristic constituents of monoglycosylceramides from the skin of three frog species. Comp Biochem Physiol C Comp Pharmacol 1975; 52:81-4. [PMID: 3369 DOI: 10.1016/0306-4492(75)90017-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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