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Piani F, Reinicke T, Lytvyn Y, Melena I, Lovblom LE, Lai V, Tse J, Cham L, Orszag A, Perkins BA, Cherney DZI, Bjornstad P. Vasopressin associated with renal vascular resistance in adults with longstanding type 1 diabetes with and without diabetic kidney disease. J Diabetes Complications 2021; 35:107807. [PMID: 33288413 PMCID: PMC8397596 DOI: 10.1016/j.jdiacomp.2020.107807] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 11/12/2020] [Accepted: 11/13/2020] [Indexed: 02/09/2023]
Abstract
OBJECTIVE Arginine vasopressin (AVP) and its surrogate, copeptin, have been implicated in diabetic kidney disease (DKD) pathogenesis, which develops in a subset of people with longstanding type 1 diabetes, but not in others (DKD Resistors). We hypothesized that patients with DKD would exhibit higher copeptin concentrations vs. DKD Resistors. METHODS Participants with type 1 diabetes (n = 62, duration ≥50 years) were stratified into 42 DKD Resistors and 20 with DKD (eGFR ≤60 mL/min/1.73m2 or ≥30 mg/day urine albumin), and age/sex-matched controls (HC, n = 74) were included. Glomerular filtration rate (GFR) and effective renal plasma flow (ERPF) were calculated by inulin and p-aminohippurate clearance before and after angiotensin II (ang II) infusion. Renal vascular resistance (RVR) was calculated as mean arterial pressure/renal blood flow. Plasma copeptin, renin, aldosterone, neutrophil gelatinase-associated lipocalin (NGAL), and urea concentrations were measured, along with 24-h urine volume. RESULTS DKD resistors had lower copeptin (95% CI: 4.0 [3.4-4.8] pmol/l) compared to DKD (5.8 [4.5-7.6] pmol/l, p = 0.02) and HC (4.8 [4.1-5.5] pmol/l, p = 0.01) adjusting for age, sex and HbA1c. In type 1 diabetes, higher copeptin correlated with lower GFR (r: -0.32, p = 0.01) and higher renin concentration (r: 0.40, p = 0.002) after multivariable adjustments. These relationships were not evident in HC. Copeptin inversely associated with RVR change following exogenous ang II only in participants with type 1 diabetes (β ± SE: -6.9 ± 3.4, p = 0.04). CONCLUSIONS In longstanding type 1 diabetes, copeptin was associated with intrarenal renin-angiotensin-aldosterone system (RAAS) activation and renal hemodynamic function, suggesting interplay between AVP and RAAS in DKD pathogenesis.
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Affiliation(s)
- Federica Piani
- Department of Medicine, Division of Renal Diseases and Hypertension, University of Colorado School of Medicine, Aurora, CO, USA; Department of Pediatrics, Section of Endocrinology, University of Colorado School of Medicine, Aurora, CO, USA
| | - Trenton Reinicke
- Department of Medicine, Division of Renal Diseases and Hypertension, University of Colorado School of Medicine, Aurora, CO, USA; Department of Pediatrics, Section of Endocrinology, University of Colorado School of Medicine, Aurora, CO, USA
| | - Yuliya Lytvyn
- Division of Nephrology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Isabella Melena
- Department of Medicine, Division of Renal Diseases and Hypertension, University of Colorado School of Medicine, Aurora, CO, USA; Department of Pediatrics, Section of Endocrinology, University of Colorado School of Medicine, Aurora, CO, USA
| | - Leif E Lovblom
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Vesta Lai
- Division of Nephrology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Josephine Tse
- Division of Nephrology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Leslie Cham
- Division of Nephrology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Andrej Orszag
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Bruce A Perkins
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada; Division of Endocrinology and Metabolism, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - David Z I Cherney
- Division of Nephrology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada; Department of Physiology, University of Toronto, Canada
| | - Petter Bjornstad
- Department of Medicine, Division of Renal Diseases and Hypertension, University of Colorado School of Medicine, Aurora, CO, USA; Department of Pediatrics, Section of Endocrinology, University of Colorado School of Medicine, Aurora, CO, USA.
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Tahara A, Tsukada J, Tomura Y, Yatsu T, Shibasaki M. Downregulation of vasopressin V1A receptors and activation of mitogen-activated protein kinase in rat mesangial cells cultured under high-glucose conditions. Clin Exp Pharmacol Physiol 2013; 39:438-46. [PMID: 22352691 DOI: 10.1111/j.1440-1681.2012.05693.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
SUMMARY In the present study we examined the effects of high extracellular glucose concentrations on vasopressin (AVP) V(1A) receptor kinetics and signal transduction in cultured rat mesangial cells. Scatchard analysis of [(3) H]-AVP binding to mesangial cell plasma membranes showed that although high glucose (30 mmol/L) decreased V(1A) receptor numbers relative to cells cultured in normal glucose (10 mmol/L), receptor affinity was not affected. This V(1A) receptor downregulation was associated with an attenuated increase in AVP-stimulated cytosolic free calcium concentrations ([Ca(2+) ](i) ). In addition, high glucose increased both the basal and AVP-stimulated activity of the classic mitogen-activated protein kinase, namely extracellular signal-regulated kinase (ERK). Furthermore, high glucose induced activation of protein kinase C (PKC) in mesangial cells that could be inhibited by coincubation with the PKC inhibitor staurosporine (10 nmol/L). Staurosporine also markedly attenuated the high glucose-induced downregulation of V(1A) receptors on mesangial cells and blocked the depressed [Ca(2+) ](i) response and increased ERK activity induced by AVP. The results indicate that high extracellular glucose downregulates V(1A) receptors on rat mesangial cells and modulates their signal transduction properties via PKC activation.
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Affiliation(s)
- Atsuo Tahara
- Drug Discovery Research, Astellas Pharma Inc., Tsukuba, Japan.
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Sharma K, Deelman L, Madesh M, Kurz B, Ciccone E, Siva S, Hu T, Zhu Y, Wang L, Henning R, Ma X, Hajnoczky G. Involvement of transforming growth factor-beta in regulation of calcium transients in diabetic vascular smooth muscle cells. Am J Physiol Renal Physiol 2003; 285:F1258-70. [PMID: 12876066 DOI: 10.1152/ajprenal.00145.2003] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Altered calcium [Ca2+] transients of vascular smooth muscle cells to vasoconstrictors may contribute to altered regulation of blood flow in diabetes. We postulated that diabetes-induced transforming growth factor (TGF)-beta production contributes to impaired ANG II response of vascular smooth muscle cells in macrovessels and microvessels. Aortic vascular smooth muscle cells isolated from diabetic rats exhibited markedly impaired ANG II-induced cytosolic calcium [Ca2+] signal that was completely restored by pretreatment with anti-TGF-beta antibodies. Similar findings were noted in microvascular smooth muscle cells isolated from preglomerular vessels and cultured in high glucose. The impact of diabetes on [Ca2+] transients was replicated by addition of TGF-beta1 and -beta2 isoforms to aortic smooth muscle cells in culture and diabetic cells had enhanced production of TGF-beta2. In the in vivo condition, TGF-beta1 was increased in diabetic glomeruli, whereas TGF-beta2 was increased in diabetic aorta. The characteristic increase in glomerular filtration surface area found in diabetic rats was prevented by treatment with anti-TGF-beta antibodies, and impaired ANG II-induced aortic ring contraction in diabetic rats was completely restored by anti-TGF-beta antibodies. Impaired vascular dysfunction may be partly due to decreased inositol 1,4,5-trisphosphate receptor (IP3R), as reduced type I IP3R expression was found in diabetic aorta and restored by anti-TGF-beta antibodies. We conclude that TGF-beta plays an important role in the vascular dysfunction of early diabetes by inhibiting calcium transients in vascular smooth muscle cells.
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MESH Headings
- Angiotensin II/pharmacology
- Animals
- Antibodies/pharmacology
- Aorta/metabolism
- Calcium/metabolism
- Calcium Channels/metabolism
- Diabetes Mellitus, Experimental/metabolism
- Diabetes Mellitus, Experimental/pathology
- Diabetes Mellitus, Experimental/physiopathology
- Diabetic Nephropathies/metabolism
- Diabetic Nephropathies/pathology
- Diabetic Nephropathies/prevention & control
- Hypertrophy
- Inositol 1,4,5-Trisphosphate Receptors
- Kidney Glomerulus/pathology
- Microcirculation
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Rats
- Rats, Sprague-Dawley
- Receptor, Angiotensin, Type 1/metabolism
- Receptors, Cytoplasmic and Nuclear/metabolism
- Transforming Growth Factor beta/immunology
- Transforming Growth Factor beta/metabolism
- Transforming Growth Factor beta1
- Transforming Growth Factor beta2
- Vasoconstriction/physiology
- Vasoconstrictor Agents/pharmacology
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Affiliation(s)
- Kumar Sharma
- Dorrance Hamilton Research Laboratories, Division of Nephrology, Department of Medicine, Thomas Jefferson University, Suite 353, Jeff Alumni Hall, 1020 Locust Street, Philadelphia, PA 19107, USA.
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Barthelmebs M, Wiernsperger N, Krieger JP, Rapin JR, Radziuk J, Grima M, Imbs JI. Mild acute renal failure potentiates metformin accumulation in the diabetic rat kidney without further impairment of renal function. DIABETES & METABOLISM 2003; 29:163-70. [PMID: 12746638 DOI: 10.1016/s1262-3636(07)70024-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVES To analyze, in acute renal failure (ARF) in diabetic rats, how moderate functional ARF would modify metformin (MET) pharmacokinetics and if plasma and renal tissue MET accumulation could aggravate renal insufficiency and/or elicit plasma lactate accumulation. METHODS Streptozotocin-induced diabetic rats were allocated to four groups: control, MET, ARF, ARF-MET (6-7 rats per group). MET (100 mg/kg/day) was given per os for two weeks before ARF was induced by drinking restriction and enalapril treatment. The effects of MET and/or ARF were examined in vivo on renal function in conscious rats (metabolic cages) and ex vivo on renal vascular reactivity (isolated kidney). RESULTS MET treatment (plasma level: 5.3 +/- 1.4 microg/ml, mean+/-SEM), resulted in biguanide accumulation in cortex and medulla (53 +/- 17 and 80 +/- 40 microg/g respectively). MET was devoid of any effect on creatinine clearance, mean blood pressure or renal vascular resistance, but moderately increased plasma lactate (3.8 +/- 0.5 vs 3.2 +/- 0.2 mM, P<0.05) and decreased angiotensin II-induced renal vasoconstriction. ARF, although mild, decreased renal MET clearance (0.29 +/- 0.05 vs 1.01 +/- 0.31 ml/min/100 g, P<0.05) and increased plasma and renal tissue MET levels (x 2-4). MET however did not worsen the fall in glomerular filtration rate, nor modify renal vascular reactivity. ARF did not change the MET-elicited moderate increase in plasma lactate. CONCLUSION Despite the increase in MET plasma and renal tissue levels subsequent to moderate ARF, no harmful metabolic effect on plasma lactate and no further impairment of renal function was observed in MET-treated diabetic rats subjected to ARF.
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Affiliation(s)
- M Barthelmebs
- Institut de Pharmacologie, Faculté de Médecine, Strasbourg, France.
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