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Sijbesma JWA, van Waarde A, Klooster A, Kion I, Slart RHJA, Lammertsma AA, Giacobbo BL, Boersma HH, Dierckx RAJO, van Goor H, Bakker SJL. Caloric restriction reduces proteinuria in male rats with established nephropathy. Physiol Rep 2024; 12:e15942. [PMID: 38439743 PMCID: PMC10912948 DOI: 10.14814/phy2.15942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 01/15/2024] [Accepted: 01/15/2024] [Indexed: 03/06/2024] Open
Abstract
Reducing proteinuria is a crucial approach in preventing kidney function loss. Previous preclinical studies indicated that caloric restriction (CR) imposed at a young age protects against age-related proteinuria. However, these studies have not explored CR in established renal disease. Therefore, this study aimed to investigate the impact of CR on established proteinuria. Rats, aged 12 ± 2 weeks, were administered 2.1 mg/kg of Adriamycin. Six weeks after injection, protein excretion was measured, and a [13 N]ammonia positron emission tomography (PET) scan was conducted to assess kidney perfusion. After 7 weeks rats were divided into four groups: ad libitum (AL) and CR groups fed either a 12% or a 20% protein diet. All groups were treated for 12 weeks. Blood pressure was measured and a second PET scan was acquired at the end of the study. The animals subjected to CR exhibited a 20.3% decrease in protein excretion (p = 0.003) compared to those in the AL groups. Additionally, blood pressure in the CR group was 21.2% lower (p < 0.001) than in the AL groups. While kidney function declined over time in all groups, the 20% CR group demonstrated the smallest decline. Thus CR effectively reduces urinary protein excretion and lowers blood pressure in rats with established proteinuria.
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Affiliation(s)
- J. W. A. Sijbesma
- Department of Nuclear Medicine and Molecular ImagingUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
| | - A. van Waarde
- Department of Nuclear Medicine and Molecular ImagingUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
| | - A. Klooster
- Department of PathologyPathologie FrieslandLeeuwardenThe Netherlands
| | - I. Kion
- Department of Nuclear Medicine and Molecular ImagingUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
| | - R. H. J. A. Slart
- Department of Nuclear Medicine and Molecular ImagingUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
- Department of Biomedical Photonic Imaging, Faculty of Science and TechnologyUniversity of TwenteEnschedeThe Netherlands
| | - A. A. Lammertsma
- Department of Nuclear Medicine and Molecular ImagingUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
| | - B. Lima Giacobbo
- Department of Nuclear Medicine and Molecular ImagingUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
| | - H. H. Boersma
- Department of Nuclear Medicine and Molecular ImagingUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
- Department of Clinical Pharmacy and PharmacologyUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
| | - R. A. J. O. Dierckx
- Department of Nuclear Medicine and Molecular ImagingUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
| | - H. van Goor
- Department of Pathology and Medical BiologyUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
| | - S. J. L. Bakker
- Department of NephrologyUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
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Dayton A, Almutlaq RN, Guntipally S, Ross J, Evans LC. T-cells regulate albuminuria but not hypertension, renal histology, or the medullary transcriptome in the Dahl SSCD247 +/+ rat. Am J Physiol Renal Physiol 2024; 326:F95-F104. [PMID: 37916287 PMCID: PMC11194049 DOI: 10.1152/ajprenal.00229.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 10/10/2023] [Accepted: 10/27/2023] [Indexed: 11/03/2023] Open
Abstract
In the current study, we took advantage of the loss of protection from hypertension in SSCD247-/- rats to characterize the pathological effects of renal T-cells in isolation from the confounding effects of elevated renal perfusion pressure. Male SSCD247-/- and SSCD247+/+ littermates were fed 4.0% NaCl (high salt) diet to induce hypertension. Blood pressure was assessed continuously throughout the time course with radiotelemetry. Urine albumin and protein excretion were assessed on the final day of high salt. Renal injury and medullary transcriptome were assessed after completion of the high salt protocol. In contrast to previous studies, mean arterial pressure was not significantly different between SSCD247-/- and SSCD247+/+ rats. Despite this lack of pressure difference, urinary albumin was significantly lower in SSCD247-/- rats than their wild-type littermates. In the outer medulla, substantially more transcriptomic changes were found to correlate with endpoint blood pressure than with the absence of presence of renal T-cells. We also demonstrated that renal histological damage was driven by elevated renal perfusion pressure rather than the presence of renal T-cells. In conclusion, using the loss of protection from hypertension in SSCD247-/- rats, we demonstrated that renal perfusion pressure has more profound pathological effects on the kidney than renal T-cells. However, renal T-cells, independently of blood pressure, modulate the progression of albuminuria.NEW & NOTEWORTHY In vivo studies in a T-cell-deficient rat model of salt-sensitive hypertension (SSCD247-/- rats) were used to evaluate the role of T-cells on the development of hypertension and renal damage. Detailed physiological and transcriptomic analysis demonstrated no difference in blood pressure between rats with (SSCD247+/+) or without (SSCD247-/-) T-cells. Despite this, albuminuria was significantly lower in SSCD247-/- rats than SSCD247+/+ rats.
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Affiliation(s)
- Alex Dayton
- Division of Nephrology and Hypertension, University of Minnesota, Minneapolis, Minnesota, United States
| | - Rawan N Almutlaq
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, Minnesota, United States
| | - Sridhatri Guntipally
- Department of Surgery, University of Minnesota, Minneapolis, Minnesota, United States
| | - Jaryd Ross
- Department of Surgery, University of Minnesota, Minneapolis, Minnesota, United States
| | - Louise C Evans
- Department of Surgery, University of Minnesota, Minneapolis, Minnesota, United States
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Crislip GR, Costello HM, Juffre A, Cheng KY, Lynch IJ, Johnston JG, Drucker CB, Bratanatawira P, Agarwal A, Mendez VM, Thelwell RS, Douma LG, Wingo CS, Alli AA, Scindia YM, Gumz ML. Male kidney-specific BMAL1 knockout mice are protected from K +-deficient, high-salt diet-induced blood pressure increases. Am J Physiol Renal Physiol 2023; 325:F656-F668. [PMID: 37706232 PMCID: PMC10874679 DOI: 10.1152/ajprenal.00126.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 08/22/2023] [Accepted: 09/07/2023] [Indexed: 09/15/2023] Open
Abstract
The circadian clock protein basic helix-loop-helix aryl hydrocarbon receptor nuclear translocator-like protein 1 (BMAL1) is a transcription factor that impacts kidney function, including blood pressure (BP) control. Previously, we have shown that male, but not female, kidney-specific cadherin Cre-positive BMAL1 knockout (KS-BMAL1 KO) mice exhibit lower BP compared with littermate controls. The goal of this study was to determine the BP phenotype and immune response in male KS-BMAL1 KO mice in response to a low-K+ high-salt (LKHS) diet. BP, renal inflammatory markers, and immune cells were measured in male mice following an LKHS diet. Male KS-BMAL1 KO mice had lower BP following the LKHS diet compared with control mice, yet their circadian rhythm in pressure remained unchanged. Additionally, KS-BMAL1 KO mice exhibited lower levels of renal proinflammatory cytokines and immune cells following the LKHS diet compared with control mice. KS-BMAL1 KO mice were protected from the salt-sensitive hypertension observed in control mice and displayed an attenuated immune response following the LKHS diet. These data suggest that BMAL1 plays a role in driving the BP increase and proinflammatory environment that occurs in response to an LKHS diet.NEW & NOTEWORTHY We show here, for the first time, that kidney-specific BMAL1 knockout mice are protected from blood pressure (BP) increases and immune responses to a salt-sensitive diet. Other kidney-specific BMAL1 knockout models exhibit lower BP phenotypes under basal conditions. A salt-sensitive diet exacerbates this genotype-specific BP response, leading to fewer proinflammatory cytokines and immune cells in knockout mice. These data demonstrate the importance of distal segment BMAL1 in BP and immune responses to a salt-sensitive environment.
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Affiliation(s)
- G Ryan Crislip
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, Florida, United States
| | - Hannah M Costello
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, Florida, United States
| | - Alexandria Juffre
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, Florida, United States
- Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, Florida, United States
| | - Kit-Yan Cheng
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
| | - I Jeanette Lynch
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
- Department of Research, North Florida/South Georgia Veterans Health System, Gainesville, Florida, United States
| | - Jermaine G Johnston
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, Florida, United States
- Department of Research, North Florida/South Georgia Veterans Health System, Gainesville, Florida, United States
| | - Charles B Drucker
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
| | - Phillip Bratanatawira
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
| | - Annanya Agarwal
- Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, Florida, United States
| | - Victor M Mendez
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
| | - Ryanne S Thelwell
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
| | - Lauren G Douma
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
- Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, Florida, United States
| | - Charles S Wingo
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
- Department of Research, North Florida/South Georgia Veterans Health System, Gainesville, Florida, United States
| | - Abdel A Alli
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, Florida, United States
| | - Yogesh M Scindia
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University of Florida, Gainesville, Florida, United States
| | - Michelle L Gumz
- Department of Physiology and Aging, University of Florida, Gainesville, Florida, United States
- Division of Nephrology, Hypertension, and Renal Transplantation, Department of Medicine, University of Florida, Gainesville, Florida, United States
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, Florida, United States
- Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, Florida, United States
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Sakamuri A, Bardhan P, Tummala R, Mauvais-Jarvis F, Yang T, Joe B, Ogola BO. Sex hormones, sex chromosomes, and microbiota: Identification of Akkermansia muciniphila as an estrogen-responsive microbiota. MICROBIOTA AND HOST 2023; 1:e230010. [PMID: 37937163 PMCID: PMC10629929 DOI: 10.1530/mah-23-0010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
Microbiota composition is known to be linked to sex. However, separating sex hormones and sex chromosome roles in gut microbial diversity is yet to be determined. To investigate the sex chromosome role independent of sex hormones, we used the four-core genotype mouse model. In this mouse model, males with testes and females with ovaries have XX or XY sex chromosome complement. In gonadectomized four-core genotype mice, we observed a significant decrease in the levels of estradiol (P<0.001) and progesterone (P<0.03) in female and testosterone (P<0.0001) in male mice plasma samples. Independent of sex chromosome complement, microbial α diversity was increased in gonadectomized female but not male mice compared to sex-matched gonad-intact controls. β diversity analysis showed separation between male (P<0.05) but not female XX and XY mice. Importantly, Akkermansia muciniphila was less abundant in gonadectomized compared to gonadal intact female mice (P<0.0001). In the presence of β-estradiol, Akkermansia muciniphila growth exponentially increased, providing evidence for the identification of a female sex hormone-responsive bacterium (P<0.001).
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Affiliation(s)
- Anil Sakamuri
- Vascular Biology Center and Department of Medicine, Medical College of Georgia at Augusta University, Augusta, GA USA
| | - Pritam Bardhan
- UT Microbiome Consortium, Department of Physiology & Pharmacology, University of Toledo College of Medicine and Life Sciences, Toledo, OH USA
| | - Ramakumar Tummala
- UT Microbiome Consortium, Department of Physiology & Pharmacology, University of Toledo College of Medicine and Life Sciences, Toledo, OH USA
| | - Franck Mauvais-Jarvis
- Section of Endocrinology and Metabolism, Tulane University Health Sciences Center, New Orleans, LA USA
| | - Tao Yang
- UT Microbiome Consortium, Department of Physiology & Pharmacology, University of Toledo College of Medicine and Life Sciences, Toledo, OH USA
| | - Bina Joe
- UT Microbiome Consortium, Department of Physiology & Pharmacology, University of Toledo College of Medicine and Life Sciences, Toledo, OH USA
| | - Benard Ojwang Ogola
- Vascular Biology Center and Department of Medicine, Medical College of Georgia at Augusta University, Augusta, GA USA
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Shimada S, Hoffmann BR, Yang C, Kurth T, Greene AS, Liang M, Dash RK, Cowley AW. Metabolic Responses of Normal Rat Kidneys to a High Salt Intake. FUNCTION 2023; 4:zqad031. [PMID: 37575482 PMCID: PMC10413938 DOI: 10.1093/function/zqad031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 06/06/2023] [Accepted: 06/12/2023] [Indexed: 08/15/2023] Open
Abstract
In this study, novel methods were developed, which allowed continuous (24/7) measurement of arterial blood pressure and renal blood flow in freely moving rats and the intermittent collection of arterial and renal venous blood to estimate kidney metabolic fluxes of O2 and metabolites. Specifically, the study determined the effects of a high salt (HS; 4.0% NaCl) diet upon whole kidney O2 consumption and arterial and renal venous plasma metabolomic profiles of normal Sprague-Dawley rats. A separate group of rats was studied to determine changes in the cortex and outer medulla tissue metabolomic and mRNAseq profiles before and following the switch from a 0.4% to 4.0% NaCl diet. In addition, targeted mRNA expression analysis of cortical segments was performed. Significant changes in the metabolomic and transcriptomic profiles occurred with feeding of the HS diet. A progressive increase of kidney O2 consumption was found despite a reduction in expression of most of the mRNA encoding enzymes of TCA cycle. A novel finding was the increased expression of glycolysis-related genes in Cx and isolated proximal tubular segments in response to an HS diet, consistent with increased release of pyruvate and lactate from the kidney to the renal venous blood. Data suggests that aerobic glycolysis (eg, Warburg effect) may contribute to energy production under these circumstances. The study provides evidence that kidney metabolism responds to an HS diet enabling enhanced energy production while protecting from oxidative stress and injury. Metabolomic and transcriptomic analysis of kidneys of Sprague-Dawley rats fed a high salt diet.
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Affiliation(s)
- Satoshi Shimada
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Brian R Hoffmann
- Mass Spectrometry and Protein Chemistry, Protein Sciences, The Jackson Laboratory, Bar Harbor, ME 04609, USA
| | - Chun Yang
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Theresa Kurth
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Andrew S Greene
- Mass Spectrometry and Protein Chemistry, Protein Sciences, The Jackson Laboratory, Bar Harbor, ME 04609, USA
| | - Mingyu Liang
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Ranjan K Dash
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
- Department of Biomedical Engineering, Medical College of Wisconsin and Marquette University, Milwaukee, WI 53226, USA
| | - Allen W Cowley
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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