scholarly journals Overexpression of aminopeptidase A abolishes the growth promoting effects of angiotensin II in cultured mouse mesangial cells

1997 ◽  
Vol 52 (5) ◽  
pp. 1250-1260 ◽  
Author(s):  
Gunter Wolf ◽  
Karel J.M. Assmann ◽  
Rolf A.K. Stahl
Keyword(s):  
Angiotensin Ii ◽  
Mesangial Cells ◽  
Aminopeptidase A ◽  
Growth Promoting

Rat kidney glutamyl aminopeptidase (aminopeptidase A): molecular identity and cellular localization

1994 ◽  
Vol 267 (4) ◽  
pp. F546-F557 ◽  
Author(s):  
L. Song ◽  
M. Ye ◽  
M. Troyanovskaya ◽  
E. Wilk ◽  
S. Wilk ◽  
...  
Keyword(s):  
Amino Acid ◽  
Angiotensin Ii ◽  
Cellular Localization ◽  
Mesangial Cells ◽  
Rat Kidney ◽  
Blot Hybridization ◽  
Northern Blot Hybridization ◽  
Glomerular Mesangial Cells ◽  
Partial Cdna ◽  
Aminopeptidase A

Glutamyl aminopeptidase [aminopeptidase A (EAP), EC 3.4.11.7] is an ectoenzyme that selectively hydrolyzes acidic amino acid residues from the amino terminus of oligopeptides. EAP activity is highest within the kidney and small intestine. The murine pre-B cell BP-1/6C3 and the human kidney glycoprotein gp160 differentiation antigens have been reported to have biochemical properties indistinguishable from EAP. It is not known, however, if rat kidney EAP is a homologue of these antigens or molecularly distinct. Using the reverse transcription-polymerase chain reaction method with oligonucleotide primers based on the BP-1/6C3 nucleotide sequence, we isolated a 450-bp partial cDNA from rat kidney poly(A)+ RNA. The partial cDNA encoded a predicted protein that was 92% and 86% identical to the murine BP-1/6C3 and human gp160 antigens, respectively; the amino acid sequence within the zinc-binding domain was completely conserved. Purification of EAP from rat kidney and microsequence analysis of a tryptic digest peptide fragment (18-mer) indicated that the fragment was highly similar to a region within the BP-1/6C3 and gp160 proteins. Northern blot hybridization and immunoblot analyses were also consistent with labeling of products the same size as reported for the BP-1/6C3 and gp160 antigens. There was a good correlation between the cellular distribution of EAP mRNA and EAP immunoreactivity, with proximal tubules and glomerular mesangial cells having the highest densities. These results indicate that rat kidney EAP is a species homologue of the murine BP-1/6C3 and human gp160 antigens. Furthermore, on the basis of its cellular localization, rat kidney EAP is likely to be involved in degradation of oligopeptides within the glomerulus and the glomerular filtrate. Since cells that express EAP also express receptors for angiotensin II, an intrarenal vasoactive hormone that is a substrate for EAP, these results further suggest that EAP may play a role in modulating the activity of intrarenal angiotensin II.

scholarly journals (Pro)renin receptor: another member of the system controlled by angiotensin II?

2011 ◽  
Vol 13 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Luciana G Pereira ◽  
Carine P Arnoni ◽  
Edgar Maquigussa ◽  
Priscila C Cristovam ◽  
Juliana Dreyfuss ◽  
...  
Keyword(s):  
Gene Expression ◽  
Angiotensin Ii ◽  
Mesangial Cells ◽  
At1 Receptor ◽  
Receptor Internalization ◽  
Prorenin Receptor ◽  
Receptor Blockers ◽  
And Function ◽  
At1 Receptor Blockers

The prorenin receptor [(P)RR] is upregulated in the diabetic kidney and has been implicated in the high glucose (HG)-induced overproduction of profibrotic molecules by mesangial cells (MCs), which is mediated by ERK1/2 phosphorylation. The regulation of (P)RR gene transcription and the mechanisms by which HG increases (P)RR gene expression are not fully understood. Because intracellular levels of angiotensin II (AngII) are increased in MCs stimulated with HG, we used this in vitro system to evaluate the possible role of AngII in (P)RR gene expression and function by comparing the effects of AT1 receptor blockers (losartan or candesartan) and (P)RR mRNA silencing (siRNA) in human MCs (HMCs) stimulated with HG. HG induced an increase in (P)RR and fibronectin expression and in ERK1/2 phosphorylation. These effects were completely reversed by (P)RR siRNA and losartan but not by candesartan (an angiotensin receptor blocker that, in contrast to losartan, blocks AT1 receptor internalization). These results suggest that (P)RR gene activity may be controlled by intracellular AngII and that HG-induced ERK1/2 phosphorylation and fibronectin overproduction are primarily induced by (P)RR activation. This relationship between AngII and (P)RR may constitute an additional pathway of MC dysfunction in response to HG stimulation.

P-450 Metabolites of Arachidonic Acid in the Control of Cardiovascular Function

2002 ◽  
Vol 82 (1) ◽  
pp. 131-185 ◽  
Author(s):  
Richard J. Roman
Keyword(s):  
Arachidonic Acid ◽  
Angiotensin Ii ◽  
Vascular Tone ◽  
Mesangial Cells ◽  
Cardiovascular Function ◽  
Tubuloglomerular Feedback ◽  
Peripheral Vasculature ◽  
Therapeutic Benefits

Recent studies have indicated that arachidonic acid is primarily metabolized by cytochrome P-450 (CYP) enzymes in the brain, lung, kidney, and peripheral vasculature to 20-hydroxyeicosatetraenoic acid (20-HETE) and epoxyeicosatrienoic acids (EETs) and that these compounds play critical roles in the regulation of renal, pulmonary, and cardiac function and vascular tone. EETs are endothelium-derived vasodilators that hyperpolarize vascular smooth muscle (VSM) cells by activating K+channels. 20-HETE is a vasoconstrictor produced in VSM cells that reduces the open-state probability of Ca2+-activated K+channels. Inhibitors of the formation of 20-HETE block the myogenic response of renal, cerebral, and skeletal muscle arterioles in vitro and autoregulation of renal and cerebral blood flow in vivo. They also block tubuloglomerular feedback responses in vivo and the vasoconstrictor response to elevations in tissue Po2both in vivo and in vitro. The formation of 20-HETE in VSM is stimulated by angiotensin II and endothelin and is inhibited by nitric oxide (NO) and carbon monoxide (CO). Blockade of the formation of 20-HETE attenuates the vascular responses to angiotensin II, endothelin, norepinephrine, NO, and CO. In the kidney, EETs and 20-HETE are produced in the proximal tubule and the thick ascending loop of Henle. They regulate Na+transport in these nephron segments. 20-HETE also contributes to the mitogenic effects of a variety of growth factors in VSM, renal epithelial, and mesangial cells. The production of EETs and 20-HETE is altered in experimental and genetic models of hypertension, diabetes, uremia, toxemia of pregnancy, and hepatorenal syndrome. Given the importance of this pathway in the control of cardiovascular function, it is likely that CYP metabolites of arachidonic acid contribute to the changes in renal function and vascular tone associated with some of these conditions and that drugs that modify the formation and/or actions of EETs and 20-HETE may have therapeutic benefits.

Placental Aminopeptidase A as a Possible Barrier of Angiotensin II between Mother and Fetus

Placenta ◽  
2000 ◽  
Vol 21 (7) ◽  
pp. 621-627 ◽  
Author(s):  
Y. Hariyama ◽  
A. Itakura ◽  
M. Okamura ◽  
M. Ito ◽  
Y. Murata ◽  
...  
Keyword(s):  
Angiotensin Ii ◽  
Aminopeptidase A

Ion channel activities of cultured rat mesangial cells

1991 ◽  
Vol 261 (5) ◽  
pp. F808-F814 ◽  
Author(s):  
H. Matsunaga ◽  
N. Yamashita ◽  
Y. Miyajima ◽  
T. Okuda ◽  
H. Chang ◽  
...  
Keyword(s):  
Angiotensin Ii ◽  
Ion Channels ◽  
Patch Clamp ◽  
Ion Channel ◽  
Arginine Vasopressin ◽  
Mesangial Cells ◽  
Cation Channel ◽  
K Channel ◽  
Patch Clamp Technique ◽  
Inside Out

We used the patch-clamp technique to clarify the nature of ion channels in renal mesangial cells in culture. In the cell-attached mode most patches were silent in the absence of agonists. In some patches a 25-pS nonselective channel was observed. This 25-pS cation channel was consistently observed in inside-out patches, and it was activated by intracellular Ca2+. Excised patch experiments also revealed the existence of a 40-pS K+ channel, which was activated by intracellular Ca2+. This 40-pS K+ channel was observed infrequently in the cell-attached mode. The activities of both channels were increased by arginine vasopressin or angiotensin II, resulting from an increase in intracellular Ca2+ concentration.

scholarly journals Effect of adrenotensin on cell proliferation is mediated by angiotensin II in cultured rat mesangial cells

2009 ◽  
Vol 30 (8) ◽  
pp. 1132-1137 ◽  
Author(s):  
Hong Xue ◽  
Ping Yuan ◽  
Li Zhou ◽  
Tai Yao ◽  
Yu Huang ◽  
...  
Keyword(s):  
Cell Proliferation ◽  
Angiotensin Ii ◽  
Mesangial Cells

scholarly journals Sauchinone Protects Renal Mesangial Cell Dysfunction against Angiotensin II by Improving Renal Fibrosis and Inflammation

2020 ◽  
Vol 21 (19) ◽  
pp. 7003
Author(s):  
Jung Joo Yoon ◽  
Hyeon Kyoung Lee ◽  
Hye Yoom Kim ◽  
Byung Hyuk Han ◽  
Ho Sub Lee ◽  
...  
Keyword(s):  
Cell Proliferation ◽  
Diabetic Nephropathy ◽  
Angiotensin Ii ◽  
Mesangial Cell ◽  
Mesangial Cells ◽  
Tissue Growth ◽  
Biologically Active ◽  
Dependent Manner ◽  
Saururus Chinensis ◽  
Mesangial Cell Proliferation

Abnormal and excessive growth of mesangial cells is important in the pathophysiologic processes of diabetes-associated interstitial fibrosis and glomerulosclerosis, leading to diabetic nephropathy, which eventually turns into end-stage renal disease. Sauchinone, a biologically-active lignan isolated from aerial parts of Saururus chinensis, has anti-inflammatory and anti-viral activities effects on various cell types. However, there are no studies reporting the effects of sauchinone on diabetic nephropathy. The present study aims to investigate the role of sauchinone in mesangial cell proliferation and fibrosis induced by angiotensin II, as well as the underlying mechanisms of these processes. Human renal mesangial cells were induced by angiotensin II (AngII, 10 μM) in the presence or absence of sauchinone (0.1–1 μM) and incubated for 48 h. In this study, we found that AngII induced mesangial cell proliferation, while treatment with sauchinone inhibited the cell proliferation in a dose-dependent manner. Pre-treatment with sauchinone induced down-regulation of cyclins/CDKs and up-regulation of CDK inhibitor, p21, and p27kip1 expression. In addition, AngII-enhanced expression of fibrosis biomarkers such as fibronectin, collagen IV, and connective tissue growth factor (CTGF), which was markedly attenuated by sauchinone. Sauchinone also decreased AngII-induced TGF-β1 and Smad-2, Smad-3, and Smad-4 expression. This study further revealed that sauchinone ameliorated AngII-induced mesangial inflammation through disturbing activation of inflammatory factors, and NLRP3 inflammasome, which is composed of the NLRP3 protein, procaspase-1, and apoptosis-associated speck-like protein containing a CARD (ASC). Moreover, pretreatment of sauchinone inhibited NF-κB translocation and ROS production in AngII-exposed mesangial cells. These data suggest that sauchinone has a protective effect on renal proliferation, fibrosis and inflammation. Therefore, sauchinone might be a potential pharmacological agent in prevention of AngII-induced renal damage leading to diabetic nephropathy.

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