scholarly journals Phosphorylation of β1-integrin in juxtaglomerular cells helps control blood pressure during the progression of diabetic nephropathy

2021 ◽  
Author(s):  
Nobumichi Saito ◽  
Masumi Kondo ◽  
Moe Ono ◽  
Noriko Kaneyama ◽  
Makiko Abe ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Diabetic Nephropathy ◽  
Culture System ◽  
Juxtaglomerular Cells ◽  
Β1 Integrin ◽  
Afferent Arteriole ◽  
Control Blood Pressure ◽  
Pressure Sensing ◽  
Juxtaglomerular Cell ◽  
Pressure Changes

Abstract The induction of a high blood pressure due to diabetic nephropathy depends on the increase in renin secretion from juxtaglomerular cells, but many aspects of how juxtaglomerular cells sense blood pressure changes in the afferent arteriole and consequently react remain unclear. In this study, we detected the juxtaglomerular cell-specific phosphorylation of the threonine-788/789 site of β1-integrin, and its expression was negatively correlated with renin production. This relationship was also observed in a culture system of a juxtaglomerular cell line, suggesting that β1-integrin is deeply involved in the regulation of renin production. The knockdown of β1-integrin in the culture system increased renin production, but the degree of the increase was comparable to the increase in renin production by knockdown of connexin-40, which is considered to be an important molecule that plays a role in the pressure sensing mechanism of juxtaglomerular cells. This suggests that the mechanism underlying the regulation of renin production by β1-integrin in juxtaglomerular cells may contribute to the pressure-sensing function of juxtaglomerular cells themselves. Threonine-788/789 phosphorylation of β1-integrin may be involved in the regulation of this pressoreceptor function. (176 words)

scholarly journals STUDIES ON RENAL JUXTAGLOMERULAR CELLS

1957 ◽  
Vol 105 (6) ◽  
pp. 501-508 ◽  
Author(s):  
Phyllis M. Hartroft
Keyword(s):  
Blood Pressure ◽  
Renal Artery ◽  
Blood Supply ◽  
Compensatory Hypertrophy ◽  
The Other ◽  
Unilateral Nephrectomy ◽  
Juxtaglomerular Cells ◽  
Contralateral Kidney ◽  
Juxtaglomerular Cell ◽  
Hydronephrotic Kidney

Hypertension in rats produced by constriction of one renal artery was associated with degranulation of juxtaglomerular cells in the contralateral, undamped, kidney. These findings are consistent with those of other investigators. Furthermore, the degree of granulation (JGI) in the unclamped kidney was inversely correlated with the level of blood pressure (r = –0.7). Degranulation of JG cells also occurred in rats made hypertensive by application of a "figure-of-eight" ligature to one kidney and removal of the other one, except when the interference in blood supply was so severe that scarring resulted. In these damaged areas, granules persisted or increased in number even though they were decreased in adjacent relatively normal areas. Occlusion of one ureter in rats produced severe hydronephrosis in the homolateral kidney and an elevation in blood pressure. Juxtaglomerular cell granules persisted in the hydronephrotic kidney but were decreased in the contralateral one. This finding confirmed the results of the above experiments. Unilateral nephrectomy in comparable rats had no effect on the degree of granulation of JG cells in the remaining kidney or on the level of blood pressure under the conditions of these experiments. The possibility that degranulation of JG cells in the contralateral kidney in the rats described above was due to compensatory hypertrophy was thereby excluded. An elevation in blood pressure was therefore implicated as an important factor in causing degranulation of juxtaglomerular cells.

Heart Rate Signal Decomposition

2000 ◽  
Vol 39 (02) ◽  
pp. 200-203
Author(s):  
H. Mizuta ◽  
K. Yana
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Pressure Change ◽  
Normal Subjects ◽  
Signal Decomposition ◽  
Large Individual ◽  
Heart Rate Fluctuations ◽  
Type Pattern ◽  
Signal Cancellation ◽  
Pressure Changes

Abstract:This paper proposes a method for decomposing heart rate fluctuations into background, respiratory and blood pressure oriented fluctuations. A signal cancellation scheme using the adaptive RLS algorithm has been introduced for canceling respiration and blood pressure oriented changes in the heart rate fluctuations. The computer simulation confirmed the validity of the proposed method. Then, heart rate fluctuations, instantaneous lung volume and blood pressure changes are simultaneously recorded from eight normal subjects aged 20-24 years. It was shown that after signal decomposition, the power spectrum of the heart rate showed a consistent monotonic 1/fa type pattern. The proposed method enables a clear interpretation of heart rate spectrum removing uncertain large individual variations due to the respiration and blood pressure change.

PENGARUH TERAPI TERTAWA TERHADAP PENURUNAN TEKANAN DARAH LANSIA DI UPT PANTI WREDHA BUDHI DHARMA YOGYAKARTA

2019 ◽  
Vol 13 (1) ◽  
Author(s):  
Niken Setyaningrum ◽  
Andri Setyorini ◽  
Fachruddin Tri Fitrianta
Keyword(s):  
Blood Pressure ◽  
Data Analysis ◽  
The Elderly ◽  
Control Group ◽  
Group Comparison ◽  
Control Blood Pressure ◽  
Men And Women ◽  
Treatment Of Hypertension ◽  
Before And After ◽  
The Difference

ABSTRACTBackground: Hypertension is one of the most common diseases, because this disease is suffered byboth men and women, as well as adults and young people. Treatment of hypertension does not onlyrely on medications from the doctor or regulate diet alone, but it is also important to make our bodyalways relaxed. Laughter can help to control blood pressure by reducing endocrine stress andcreating a relaxed condition to deal with relaxation.Objective: The general objective of the study was to determine the effect of laughter therapy ondecreasing elderly blood pressure in UPT Panti Wredha Budhi Dharma Yogyakarta.Methods: The design used in this study is a pre-experimental design study with one group pre-posttestresearch design where there is no control group (comparison). The population in this study wereelderly aged over> 60 years at 55 UPT Panti Wredha Budhi Dharma Yogyakarta. The method oftaking in this study uses total sampling. The sample in this study were 55 elderly. Data analysis wasused to determine the difference in blood pressure before and after laughing therapy with a ratio datascale that was using Pairs T-TestResult: There is an effect of laughing therapy on blood pressure in the elderly at UPT Panti WredhaBudhi Dharma Yogyakarta marked with a significant value of 0.000 (P <0.05)

Afferent arteriolar diameter in DOCA-salt and two-kidney one-clip hypertensive rats

1983 ◽  
Vol 245 (6) ◽  
pp. F755-F762 ◽  
Author(s):  
B. M. Iversen ◽  
L. Morkrid ◽  
J. Ofstad
Keyword(s):  
Blood Pressure ◽  
Plasma Renin ◽  
Afferent Arteriole ◽  
Cortical Layers ◽  
Hypertensive Rats ◽  
Salt Hypertension ◽  
Nephron Loss ◽  
Microsphere Method ◽  
Arteriolar Diameter ◽  
Equal Thickness

The afferent arteriolar diameter (dAA) was investigated during development of hypertensive renal disease in normal and uninephrectomized control rats, in chronic DOCA-salt (DOCA), post-DOCA (p-DOCA), and chronic two-kidney one-clip (2K-1C) hypertensive rats, and in post-two-kidney one-clip (p-2K-1C) normotensive rats. dAA was measured by the microsphere method. Nephron loss was present in the kidneys exposed to elevate blood pressure. The dAA was reduced from 19.9 to 17.2 micron in the DOCA group (P less than 0.001) and from 19.1 to 16.3 micron in the nonclipped kidneys in the 2K-1C group (P less than 0.001). The dAA increased from 19.9 to 20.7 micron in the p-DOCA group. Afferent arteriolar dilatation from 19.1 to 21.0 micron (P less than 0.001) was present about 50 days after clipping in the 2K-1C group; in the clipped kidneys the dAA returned to normal (18.9 micron) after declipping. No relation between the dAA and plasma renin concentration was observed. In all models dAA was the same in three cortical layers of equal thickness. Accordingly, chronic renal DOCA-salt hypertension constricts the afferent arteriole with angiotensin-independent mechanisms. Autoregulatory dilatation of the afferent arteriole seems to be maintained for at least 50 days. When the hypertension is moderate, dAA in damaged kidneys may be dilated.

scholarly journals Clinical Epidemiology of Systolic and Diastolic Orthostatic Hypotension in Patients on Peritoneal Dialysis

2021 ◽  
Vol 10 (14) ◽  
pp. 3075
Author(s):  
Claudia Torino ◽  
Rocco Tripepi ◽  
Maria Carmela Versace ◽  
Antonio Vilasi ◽  
Giovanni Tripepi ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Peritoneal Dialysis ◽  
Orthostatic Hypotension ◽  
Clinical Epidemiology ◽  
Hemodialysis Patients ◽  
Excess Death ◽  
Death Risk ◽  
Standardized Protocol ◽  
Pressure Changes ◽  
The Impact

Blood pressure changes upon standing reflect a hemodynamic response, which depends on the baroreflex system and euvolemia. Dysautonomia and fluctuations in blood volume are hallmarks in kidney failure requiring replacement therapy. Orthostatic hypotension has been associated with mortality in hemodialysis patients, but neither this relationship nor the impact of changes in blood pressure has been tested in patients on peritoneal dialysis. We investigated both these relationships in a cohort of 137 PD patients. The response to orthostasis was assessed according to a standardized protocol. Twenty-five patients (18%) had systolic orthostatic hypotension, and 17 patients (12%) had diastolic hypotension. The magnitude of systolic and diastolic BP changes was inversely related to the value of the corresponding supine BP component (r = −0.16, p = 0.056 (systolic) and r = −0.25, p = 0.003 (diastolic), respectively). Orthostatic changes in diastolic, but not in systolic, BP were linearly related to the death risk (HR (1 mmHg reduction): 1.04, 95% CI 1.01–1.07, p = 0.006), and this was also true for CV death (HR: 1.08, 95% CI 1.03–1.12, p = 0.001). The strength of this association was not affected by further data adjustment (p ≤ 0.05). These findings suggest that independent of the formal diagnosis of orthostatic hypotension, even minor orthostatic reductions in diastolic BP bear an excess death risk in this population.

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