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Yasuoka Y, Izumi Y, Fukuyama T, Oshima T, Yamazaki T, Uematsu T, Kobayashi N, Nanami M, Shimada Y, Nagaba Y, Mukoyama M, Sands JM, Takahashi N, Kawahara K, Nonoguchi H. Tubular Endogenous Erythropoietin Protects Renal Function against Ischemic Reperfusion Injury. Int J Mol Sci 2024; 25:1223. [PMID: 38279224 PMCID: PMC10816907 DOI: 10.3390/ijms25021223] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/16/2024] [Accepted: 01/17/2024] [Indexed: 01/28/2024] Open
Abstract
Many large-scale studies show that exogenous erythropoietin, erythropoiesis-stimulating agents, lack any renoprotective effects. We investigated the effects of endogenous erythropoietin on renal function in kidney ischemic reperfusion injury (IRI) using the prolyl hydroxylase domain (PHD) inhibitor, Roxadustat (ROX). Four h of hypoxia (7% O2) and 4 h treatment by ROX prior to IRI did not improve renal function. In contrast, 24-72 h pretreatment by ROX significantly improved the decline of renal function caused by IRI. Hypoxia and 4 h ROX increased interstitial cells-derived Epo production by 75- and 6-fold, respectively, before IRI, and worked similarly to exogenous Epo. ROX treatment for 24-72 h increased Epo production during IRI by 9-fold. Immunohistochemistry revealed that 24 h ROX treatment induced Epo production in proximal and distal tubules and worked similarly to endogenous Epo. Our data show that tubular endogenous Epo production induced by 24-72 h ROX treatment results in renoprotection but peritubular exogenous Epo production by interstitial cells induced by hypoxia and 4 h ROX treatment did not. Stimulation of tubular, but not peritubular, Epo production may link to renoprotection.
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Affiliation(s)
- Yukiko Yasuoka
- Department of Physiology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (Y.Y.); (T.O.); (K.K.)
| | - Yuichiro Izumi
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, 1-1-1 Honjo, Chuo-ku, Kumamoto 860-8556, Kumamoto, Japan; (Y.I.); (M.M.)
| | - Takashi Fukuyama
- Division of Biomedical Research, Kitasato University Medical Center, 6-100 Arai, Kitamoto 364-8501, Saitama, Japan; (T.F.); (T.Y.); (T.U.); (N.K.)
| | - Tomomi Oshima
- Department of Physiology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (Y.Y.); (T.O.); (K.K.)
| | - Taiga Yamazaki
- Division of Biomedical Research, Kitasato University Medical Center, 6-100 Arai, Kitamoto 364-8501, Saitama, Japan; (T.F.); (T.Y.); (T.U.); (N.K.)
| | - Takayuki Uematsu
- Division of Biomedical Research, Kitasato University Medical Center, 6-100 Arai, Kitamoto 364-8501, Saitama, Japan; (T.F.); (T.Y.); (T.U.); (N.K.)
| | - Noritada Kobayashi
- Division of Biomedical Research, Kitasato University Medical Center, 6-100 Arai, Kitamoto 364-8501, Saitama, Japan; (T.F.); (T.Y.); (T.U.); (N.K.)
| | - Masayoshi Nanami
- Division of Kidney and Dialysis, Department of Internal Medicine, Hyogo Medical University, 1-1 Mukogawa-cho, Nishinomiya 663-8501, Hyogo, Japan;
| | - Yoshitaka Shimada
- Division of Internal Medicine, Kitasato University Medical Center, 6-100 Arai, Kitamoto 364-8501, Saitama, Japan; (Y.S.); (Y.N.)
| | - Yasushi Nagaba
- Division of Internal Medicine, Kitasato University Medical Center, 6-100 Arai, Kitamoto 364-8501, Saitama, Japan; (Y.S.); (Y.N.)
| | - Masashi Mukoyama
- Department of Nephrology, Kumamoto University Graduate School of Medical Sciences, 1-1-1 Honjo, Chuo-ku, Kumamoto 860-8556, Kumamoto, Japan; (Y.I.); (M.M.)
| | - Jeff M. Sands
- Renal Division, Department of Medicine, Emory University School of Medicine, 1639 Pierce Drive, WMB Room 3313, Atlanta, GA 30322, USA;
| | - Noriko Takahashi
- Department of Physiology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (Y.Y.); (T.O.); (K.K.)
| | - Katsumasa Kawahara
- Department of Physiology, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami-ku, Sagamihara 252-0374, Kanagawa, Japan; (Y.Y.); (T.O.); (K.K.)
| | - Hiroshi Nonoguchi
- Division of Internal Medicine, Kitasato University Medical Center, 6-100 Arai, Kitamoto 364-8501, Saitama, Japan; (Y.S.); (Y.N.)
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Kang YY, Cheng YB, Guo QH, Sheng CS, Huang QF, Xu TY, Li Y, Wang JG. Renal Sodium Handling in Relation to Environmental and Genetic Factors in Untreated Chinese. Am J Hypertens 2021; 34:394-403. [PMID: 33005923 DOI: 10.1093/ajh/hpaa160] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 06/13/2020] [Accepted: 09/29/2020] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND We investigated proximal and distal renal tubular sodium handling, as assessed by fractional excretion of lithium (FELi) and fractional distal reabsorption rate of sodium (FDRNa), in relation to environmental and genetic factors in untreated patients. METHODS Our study participants were suspected hypertensive patients being off antihypertensive medication for ≥2 weeks and referred for 24-hour ambulatory blood pressure monitoring. We collected serum and 24-hour urine for measurement of sodium, creatinine, and lithium concentration, and calculated FELi and FDRNa. We genotyped 19 single-nucleotide polymorphisms associated with renal sodium handling or blood pressure using the ABI SNapShot method. RESULTS The 1,409 participants (664 men, 47.1%) had a mean (±SD) age of 51.0 ± 10.5 years. After adjustment for host factors, both FELi and FDRNa were significantly (P ≤ 0.01) associated with season and humidity, explaining ~1.3% and ~3.5% of the variance, respectively. FELi was highest in autumn and lowest in summer and intermediate in spring and winter (P = 0.007). FDRNa was also highest in autumn but lowest in winter and intermediate in spring and summer (P < 0.001). Neither FELi nor FDRNa was associated with outdoor temperature or atmospheric pressure (P ≥ 0.13). After adjustment for host and environmental factors and Bonferroni multiple testing, among the 19 studied genetic variants, only rs12513375 was significantly associated with FELi and FDRNa (P ≤ 0.004) and explained about 1.7% of the variance. CONCLUSIONS Renal sodium handling as measured by endogenous lithium clearance was sensitive to major environmental and genetic factors. Our finding is toward the use of these indexes for the definition of renal tubular dysfunction.
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Affiliation(s)
- Yuan-Yuan Kang
- Centre for Epidemiological Studies and Clinical Trials, Shanghai Key Laboratory of Hypertension, The Shanghai Institute of Hypertension, Department of Hypertension, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yi-Bang Cheng
- Centre for Epidemiological Studies and Clinical Trials, Shanghai Key Laboratory of Hypertension, The Shanghai Institute of Hypertension, Department of Hypertension, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Qian-Hui Guo
- Centre for Epidemiological Studies and Clinical Trials, Shanghai Key Laboratory of Hypertension, The Shanghai Institute of Hypertension, Department of Hypertension, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Chang-Sheng Sheng
- Centre for Epidemiological Studies and Clinical Trials, Shanghai Key Laboratory of Hypertension, The Shanghai Institute of Hypertension, Department of Hypertension, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Qi-Fang Huang
- Centre for Epidemiological Studies and Clinical Trials, Shanghai Key Laboratory of Hypertension, The Shanghai Institute of Hypertension, Department of Hypertension, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Ting-Yan Xu
- Centre for Epidemiological Studies and Clinical Trials, Shanghai Key Laboratory of Hypertension, The Shanghai Institute of Hypertension, Department of Hypertension, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yan Li
- Centre for Epidemiological Studies and Clinical Trials, Shanghai Key Laboratory of Hypertension, The Shanghai Institute of Hypertension, Department of Hypertension, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Ji-Guang Wang
- Centre for Epidemiological Studies and Clinical Trials, Shanghai Key Laboratory of Hypertension, The Shanghai Institute of Hypertension, Department of Hypertension, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
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Yuasa K, Kondo T, Nagai H, Mino M, Takeshita A, Okada T. Maternal protein restriction that does not have an influence on the birthweight of the offspring induces morphological changes in kidneys reminiscent of phenotypes exhibited by intrauterine growth retardation rats. Congenit Anom (Kyoto) 2016; 56:79-85. [PMID: 26537761 DOI: 10.1111/cga.12143] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 10/29/2015] [Indexed: 11/28/2022]
Abstract
Severe restriction of maternal protein intake to 6-8% protein diet results in intrauterine growth retardation (IUGR), low birthweight and high risk of metabolic syndrome in the adult life of the offspring. However, little information is available on the effects of maternal protein restriction on offspring under the conditions that does not have an influence on their birthweight of the offspring,. In the present study, pregnant rats were kept on a diet consisting of either 9% (low-protein, Lp rats) or 18% (normal-protein, Np rats) protein by weight/volume/etc. After birth, both Lp and Np rats were kept on a diet containing 18% protein. Neonatal body weight was significantly lower in Lp rats compared to Np rats from 4 days to 5 weeks after birth. While glomerular number per unit volume (1 mm(3) ) of the kidney (Nv) was comparable between Lp and Np rats 4 weeks after birth, the Nv was significantly decreased in Lp rats at 20 weeks after birth. Four and 20 weeks after birth, glomerular sclerosis index, interstitial fibrosis score, and ratio of ED1-positive cell ratio were all significantly higher in Lp compared to Np rats. Transforming growth factor-β1-positive cells were observed in the distal tubules in the kidney of 4- and 20-week-old Lp rats kidneys, but not in those of age-matched Np rats. Altogether, these findings revealed that maternal protein restriction that does not have an influence on the birthweight of the offspring, induces similar changes as those seen in the kidneys of IUGR neonates.
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Affiliation(s)
- Ko Yuasa
- Department of Integrated Structural Biosciences, Division of Veterinary Science, Graduate School of Life and Environmental Biosciences, Osaka Prefecture University, Izumi-Sano, Osaka, 598-8531, Japan
| | - Tomohiro Kondo
- Department of Integrated Structural Biosciences, Division of Veterinary Science, Graduate School of Life and Environmental Biosciences, Osaka Prefecture University, Izumi-Sano, Osaka, 598-8531, Japan
| | - Hiroaki Nagai
- Department of Integrated Structural Biosciences, Division of Veterinary Science, Graduate School of Life and Environmental Biosciences, Osaka Prefecture University, Izumi-Sano, Osaka, 598-8531, Japan
| | - Masaki Mino
- Department of Integrated Structural Biosciences, Division of Veterinary Science, Graduate School of Life and Environmental Biosciences, Osaka Prefecture University, Izumi-Sano, Osaka, 598-8531, Japan
| | - Ai Takeshita
- Department of Integrated Structural Biosciences, Division of Veterinary Science, Graduate School of Life and Environmental Biosciences, Osaka Prefecture University, Izumi-Sano, Osaka, 598-8531, Japan
| | - Toshiya Okada
- Department of Integrated Structural Biosciences, Division of Veterinary Science, Graduate School of Life and Environmental Biosciences, Osaka Prefecture University, Izumi-Sano, Osaka, 598-8531, Japan
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