Differential Human Renal Tubular Responses to Dopamine Type 1 Receptor Stimulation Are Determined by Blood Pressure Status

Hypertension ◽  
1997 ◽  
Vol 29 (1) ◽  
pp. 115-122 ◽  
Author(s):  
Damian P. O'Connell ◽  
N. Virginia Ragsdale ◽  
David G. Boyd ◽  
Robin A. Felder ◽  
Robert M. Carey
Keyword(s):  
Blood Pressure ◽  
Receptor Stimulation ◽  
Responses To Dopamine ◽  
Renal Tubular

scholarly journals Roles of Renal Proximal Tubule Transport in Acid/Base Balance and Blood Pressure Regulation

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Motonobu Nakamura ◽  
Ayumi Shirai ◽  
Osamu Yamazaki ◽  
Nobuhiko Satoh ◽  
Masashi Suzuki ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Ang Ii ◽  
Acid Base Balance ◽  
Acid Base ◽  
Blood Pressure Homeostasis ◽  
Base Balance ◽  
Proximal Renal Tubular Acidosis ◽  
Renal Tubular ◽  
Regulation Of Blood Pressure

Sodium-coupled bicarbonate absorption from renal proximal tubules (PTs) plays a pivotal role in the maintenance of systemic acid/base balance. Indeed, mutations in the Na+-HCO3-cotransporter NBCe1, which mediates a majority of bicarbonate exit from PTs, cause severe proximal renal tubular acidosis associated with ocular and other extrarenal abnormalities. Sodium transport in PTs also plays an important role in the regulation of blood pressure. For example, PT transport stimulation by insulin may be involved in the pathogenesis of hypertension associated with insulin resistance. Type 1 angiotensin (Ang) II receptors in PT are critical for blood pressure homeostasis. Paradoxically, the effects of Ang II on PT transport are known to be biphasic. Unlike in other species, however, Ang II is recently shown to dose-dependently stimulate human PT transport via nitric oxide/cGMP/ERK pathway, which may represent a novel therapeutic target in human hypertension. In this paper, we will review the physiological and pathophysiological roles of PT transport.

Clinic blood pressure shows low sensitivity to detect alterations in ambulatory blood pressure monitoring in patients with type 1 diabetes

2014 ◽  
Author(s):  
Francisco Javier Vilchez-Lopez ◽  
Isabel Mateo-Gavira ◽  
Florentino Carral-San Laureano ◽  
Maria Victoria Garcia-Palacios ◽  
Jose Ortego-Rojo ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Type 1 Diabetes ◽  
Ambulatory Blood Pressure Monitoring ◽  
Ambulatory Blood Pressure ◽  
Blood Pressure Monitoring ◽  
Clinic Blood Pressure ◽  
Pressure Monitoring ◽  
Low Sensitivity

Predictive Utilities of Blood Pressure Variables on Coronary Artery Disease in Type 1 Diabetes

Diabetes ◽  
2018 ◽  
Vol 67 (Supplement 1) ◽  
pp. 161-OR
Author(s):  
JINGCHUAN GUO ◽  
TREVOR J. ORCHARD
Keyword(s):  
Blood Pressure ◽  
Coronary Artery Disease ◽  
Type 1 Diabetes ◽  
Coronary Artery ◽  
Artery Disease

Sex differences in prenatal programming of hypertension by dexamethasone

2021 ◽  
pp. 153537022110032
Author(s):  
Issa Alhamoud ◽  
Susan K Legan ◽  
Jyothsna Gattineni ◽  
Michel Baum
Keyword(s):  
Blood Pressure ◽  
Plasma Renin ◽  
Female Offspring ◽  
Male Offspring ◽  
Thick Ascending Limb ◽  
Protein Abundance ◽  
Female Rat ◽  
Prenatal Programming ◽  
Transporter Protein ◽  
Renal Tubular

Prenatal dexamethasone has been shown to increase blood pressure in male offspring but the mechanism for the increase in blood pressure is unclear. The present study examined if prenatal programming by maternal injection of dexamethasone on days 15 and 16 of gestation affected the blood pressure comparably in female and male offspring. Our hypothesis was that males would be affected by prenatal dexamethasone to a greater extent than females and that either an increase in renal tubular transporter abundance or an increase in renin or aldosterone system would be associated with hypertension with prenatal programming. Prenatal dexamethasone increased blood pressure at two months and six months of age and resulted in proteinuria and albuminuria at six months in male but not female rat offspring. There was no effect of prenatal dexamethasone on blood pressure and proteinuria at one month in male and in female offspring. While prenatal dexamethasone increased male renal thick ascending limb sodium potassium two chloride cotransporter protein abundance at two months, prenatal dexamethasone on days 15 and 16 of gestation did not affect transporter abundance in males at other ages, nor did it affect proximal tubule sodium/hydrogen exchanger or distal convoluted tubule sodium chloride cotransporter protein abundance at any age. There was no difference in systemic renin or aldosterone in the prenatal dexamethasone group compared to same sex controls. In conclusion, male but not female offspring have an increase in blood pressure and urinary protein excretion with prenatal dexamethasone. The increase in blood pressure with prenatal programming was not associated with a consistent increase in renal tubular transporter protein abundance, nor plasma renin activity and serum aldosterone.

scholarly journals Improved Cardiovascular Tolerance to Hemorrhage after Oral Resveratrol Pretreatment in Dogs

2021 ◽  
Vol 8 (7) ◽  
pp. 129
Author(s):  
Jennifer Davis ◽  
Anthea L. Raisis ◽  
Claire R. Sharp ◽  
Rachel E. Cianciolo ◽  
Steven C. Wallis ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Placebo Group ◽  
Blood Loss ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Kidney Injury ◽  
Bleeding Risk ◽  
Canine Model ◽  
Coagulation Parameters ◽  
Renal Tubular

Resveratrol has been shown to preserve organ function and improve survival in hemorrhagic shock rat models. This study investigated whether seven days of oral resveratrol could improve hemodynamic response to hemorrhage and confer benefits on risk of acute kidney injury (AKI) without inducing coagulopathy in a canine model. Twelve greyhound dogs were randomly allocated to receive oral resveratrol (1000 mg/day) or placebo for seven days prior to inducing hemorrhage until a targeted mean blood pressure of ≤40 mmHg was achieved. AKI biomarkers and coagulation parameters were measured before, immediately following, and two hours after hemorrhage. Dogs were euthanized, and renal tissues were examined at the end of the experiment. All investigators were blinded to the treatment allocation. A linear mixed model was used to assess effect of resveratrol on AKI biomarkers and coagulation parameters while adjusting for volume of blood loss. A significant larger volume of blood loss was required to achieve the hypotension target in the resveratrol group compared to placebo group (median 64 vs. 55 mL/kg respectively, p = 0.041). Although histological evidence of AKI was evident in all dogs, the renal tubular injury scores were not significantly different between the two groups, neither were the AKI biomarkers. Baseline (pre-hemorrhage) maximum clot firmness on the Rotational Thromboelastometry (ROTEM®) was stronger in the resveratrol group than the placebo group (median 54 vs. 43 mm respectively, p = 0.009). In summary, seven days of oral resveratrol did not appear to induce increased bleeding risk and could improve greyhound dogs’ blood pressure tolerance to severe hemorrhage. Renal protective effect of resveratrol was, however, not observed.

scholarly journals Association between central non-dipping pattern and platelet morphology in adults with type 1 diabetes without cardiovascular disease: a cross-sectional study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Michal Kulecki ◽  
Dariusz Naskret ◽  
Mikolaj Kaminski ◽  
Dominika Kasprzak ◽  
Pawel Lachowski ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Type 1 Diabetes ◽  
Smoking Status ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Distribution Width ◽  
Non Invasive ◽  
Platelet Morphology ◽  
Oscillometric Device

AbstractThe non-dipping pattern is nighttime systolic blood pressure (SBP) fall of less than 10%. Several studies showed that the non-dipping pattern, increased mean platelet volume (MPV), and platelet distribution width (PDW) are associated with elevated cardiovascular risk. Hypertensives with the non-dipping pattern have higher MPV than the dippers but this relationship was never investigated among people with type 1 diabetes mellitus (T1DM). This study aimed to investigate the association between the central dipping pattern and platelet morphology in T1DM subjects. We measured the central and brachial blood pressure with a validated non-invasive brachial oscillometric device—Arteriograph 24—during twenty-four-hour analysis in T1DM subjects without diagnosed hypertension. The group was divided based on the central dipping pattern for the dippers and the non-dippers. From a total of 62 subjects (32 males) aged 30.1 (25.7–37) years with T1DM duration 15.0 (9.0–20) years, 36 were non-dippers. The non-dipper group had significantly higher MPV (MPV (10.8 [10.3–11.5] vs 10.4 [10.0–10.7] fl; p = 0.041) and PDW (13.2 [11.7–14.9] vs 12.3 [11.7–12.8] fl; p = 0.029) than dipper group. Multivariable logistic regression revealed that MPV (OR 3.74; 95% CI 1.48–9.45; p = 0.005) and PDW (OR 1.91; 95% CI 1.22–3.00; p = 0.005) were positively associated with central non-dipping pattern adjusting for age, sex, smoking status, daily insulin intake, and height. MPV and PDW are positively associated with the central non-dipping pattern among people with T1DM.

Renal Sodium Handling in Relation to Environmental and Genetic Factors in Untreated Chinese

2020 ◽  
Author(s):  
Yuan-Yuan Kang ◽  
Yi-Bang Cheng ◽  
Qian-Hui Guo ◽  
Chang-Sheng Sheng ◽  
Qi-Fang Huang ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Multiple Testing ◽  
Genetic Factors ◽  
Blood Pressure Monitoring ◽  
Lithium Concentration ◽  
Tubular Dysfunction ◽  
Renal Tubular Dysfunction ◽  
Renal Sodium Handling ◽  
Renal Tubular ◽  
Sodium Handling

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 SNPs associated with renal sodium handling or blood pressure using the ABI SNapShot method. Results The 1409 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 towards the use of these indexes for the definition of renal tubular dysfunction.

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