Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.4.24.11 (CD10)
 9,792 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The effects of the selective neutral endopeptidase (EC 3.4.24.11, NEP) inhibitor SQ 28,603 on endogenous plasma endothelin (ET) concentration and on the clearance from the circulation of exogenously administered synthetic human ET-1 were examined in Sprague-Dawley rats. Inhibition of NEP by SQ 28,603 (100 mumol/kg intravenously, i.v.) affected neither basal levels of plasma ET nor the circulatory clearance of an i.v. administered bolus dose (3 nmol/kg) of ET-1. ET-1 produced marked, statistically significant increases in plasma atrial natriuretic peptide (ANP) and cyclic GMP concentrations. SQ 28,603 markedly augmented the duration of the increases in plasma concentrations of ANP and cyclic GMP induced by exogenous ET-1. SQ 28,603 alone produced modest but statistically significant increases in plasma ANP and cyclic GMP concentrations that lasted for at least 30 min. These results clearly demonstrate that NEP does not contribute to the in vivo clearance of ET and support the hypothesis that NEP plays an important role in clearance of ANP from the circulation.
J Cardiovasc Pharmacol 1993 Apr
PMID:Effects of neutral endopeptidase inhibition on the clearance of exogenously administered endothelin in Sprague-Dawley rats. 768 10

We previously described delayed pressor response (DPR) 3 h after endothelin (ET)-1 injection in normotensive rats. In the current study, we examined effects of the ETA receptor antagonist BQ123 (0.01 mumol/kg/min intravenously, i.v.), phosphoramidon (100 mumol/kg i.v.), the neutral endopeptidase inhibitor SQ28603 (112 mumol/kg + 0.04 mumol/kg/min i.v.), the angiotensin-converting enzyme inhibitor enalaprilat (10 mumol/kg i.v.), and the thromboxane receptor antagonist, SQ29548 (0.5 mumol/kg + 0.5 mumol/kg/h i.v.) on DPR. Vehicle and ET-1 (1.0 nmol/kg i.v.) were administered on day 1; vehicle or drug and ET-1 were administered on day 2. BQ123 inhibited DPR 36% (vehicle 44 +/- 5, BQ123 28 +/- 3 mm Hg); phosphoramidon inhibited DPR 56% (vehicle 45 +/- 4, and phosphoramidon 20 +/- 5 mm Hg). DPR was unchanged after SQ28603 (vehicle 39 +/- 2 and SQ28603 44 +/- 2 mm Hg), enalaprilat (vehicle 39 +/- 2 and enalaprilat 38 +/- 7 mm Hg), or SQ29548 (vehicle 46 +/- 6 and SQ29548 43 +/- 3 mm Hg). The results suggest that DPR 3 h after ET-1 injection in rats is mediated in part through ETA receptors. DPR does not appear to involve thromboxane or synthesis of angiotensin II (AII), but may be related to synthesis of ET-1.
J Cardiovasc Pharmacol 1995 Feb
PMID:Endogenous synthesis of endothelin-1 may mediate a delayed pressor response after injection of endothelin-1 in rats. 775 57

In cardiac operations endopeptidase (protease) inhibitor may be beneficial in reducing myocardial injury when administered in the cardiopulmonary bypass prime. Nafamostat mesilate was evaluated in 20 patients who underwent coronary artery bypass grafting. The patients were divided into a control group (n = 10) and a nafamostat group (n = 10). Nafamostat (2 mg/kg per hour) was continuously given during cardiopulmonary bypass in the nafamostat group. The age, number of grafts, cardiopulmonary bypass time, and aortic crossclamp time were similar between groups. In the control group, neither tumor necrosis factor-alpha nor interleukin-1 levels showed any significant change during cardiopulmonary bypass, whereas interleukin-6 and interleukin-8 levels, percent expression of adhesion molecule (CD18) on neutrophils, and CH50 assay results increased significantly during cardiopulmonary bypass. As compared with the control group, the nafamostat group showed significantly lower levels of interleukin-6 (123 +/- 57 versus 40 +/- 22 pg/ml, respectively) and interleukin-8 (96 +/- 13 versus 66 +/- 14 pg/ml, respectively). The nafamostat group showed a significantly lower difference of CH50 assay results and malondialdehyde levels between coronary sinus blood and arterial blood and peak values of creatine kinase MB (43 +/- 12 IU/L versus 19 +/- 6 IU/L) during the postoperative course compared with findings in the control group. These results demonstrated that inflammatory reactions induced by cardiopulmonary bypass had adverse effects on myocardial recovery after aortic crossclamping and that nafamostat mesilate given during cardiopulmonary bypass appeared to reduce myocardial reperfusion injury by attenuating such inflammatory reactions. Attenuation of inflammatory reactions of cardiopulmonary bypass should be considered in the strategy of myocardial protection.
J Thorac Cardiovasc Surg 1996 Jan
PMID:Attenuation of cardiopulmonary bypass-derived inflammatory reactions reduces myocardial reperfusion injury in cardiac operations. 855 86

The membrane anchorage of endothelin-converting enzyme (ECE) and endopeptidase E-24.11 (E-24.11) was investigated using the human endothelial cell line EA.hy926 as a model system. Detergent solubilization and temperature-induced phase separation data were consistent with recently published ECE sequences in characterizing ECE as an integral membrane protein. With GK4A9, a monoclonal antibody raised to E-24.11, more than 75% of total ECE activity could be precipitated from a membrane fraction, indicating a common epitope between ECE and E-24.11.
J Cardiovasc Pharmacol 1995
PMID:Expression of ECE and related membrane peptidases in the EA.hy926 cell line. 858 68

The structure-activity relationships of phosphoramidon analogues for inhibition of endothelin-converting enzyme (ECE), neutral endopeptidase 24.11 (NEP), and angiotensin-converting enzyme (ACE) were compared. Phosphoramidon inhibited ECE, NEP, and ACE activities with IC50 values of 3.5, 0.034, and 78 microM, respectively. Removal of the rhamnose moiety of phosphoramidon (dipeptide 3) reduced the potency for ECE (IC50 = 70 microM), whereas the potencies for NEP (0.003 microM) and ACE (0.20 microM) were increased. Addition of 2-(2-naphthyl)ethyl to dipeptide 3 improved the potency for ECE (0.55 microM) but weakened the potency for NEP (0.02 microM), and had no significant change for ACE. Interchange between Leu and Trp abolished the inhibitory activities for ECE and NEP, but the compound remained active for ACE. These results suggest that a hydrophobic group in the P1 position of phosphoramidon analogues increases the potency for ECE significantly, whereas compounds containing a free phosphonic acid are optimal for inhibition of NEP and ACE. Furthermore, an aromatic group in the P'2 position is essential for the inhibition of ECE and NEP, but not ACE.
J Cardiovasc Pharmacol 1995
PMID:Differential structure-activity relationships of phosphoramidon analogues for inhibition of three metalloproteases: endothelin-converting enzyme, neutral endopeptidase, and angiotensin-converting enzyme. 858 70

The pharmacologic properties of CGS 26393, a prodrug of the endothelin-converting enzyme/neutral endopeptidase 24.11 inhibitor CGS 26303, were examined in conscious Sprague-Dawley rats. After oral administration of CGS 26393 at 30 mg/kg, the free concentrations of CGS 26303 in plasma were calculated to be 1.7 +/- 0.3, 1.2 +/- 0.2, and 0.31 +/- 0.05 microM at 4, 8, and 24 h, respectively. CGS 26393 inhibited the pressor response produced by exogenous big ET-1 in a dose-dependent manner. A 70% inhibition of the pressor response was observed when the prodrug was administered at 30 mg/kg p.o. As predicted by its pharmacokinetics, the inhibitory activity of CGS 26393 persisted for up to 8 h. These findings demonstrate that CGS 26393 in an orally active, long-acting ECE inhibitor in vivo.
J Cardiovasc Pharmacol 1995
PMID:Inhibition of big ET-1-induced pressor response by an orally active dual inhibitor of endothelin-converting enzyme and neutral endopeptidase 24.11. 858 71

To develop a new family of endothelin-converting enzyme (ECE) inhibitors, we assessed the inhibitory properties of an N- and C-terminal-truncated analogue of big endothelin (ET)-1[1-38], [Phe22]-big-ET-1 [19-37], on the renal vasoconstrictor properties of big ET-1 and ET-1. We had previously shown that a 60-min infusion of phosphoramidon (100 microM) potently inhibits big-ET-1 but not ET-1-induced vasoconstriction in the rabbit perfused kidney. A 1-min preinfusion of the analogue (100 microM) was sufficient to markedly blunt the vasoconstrictor actions of big ET-1 (250 pmol) (control 19.3 +/- 1.0 mm Hg; in presence of [Phe22]-big ET-1[19-37] 4.8 +/- 1.6 mm Hg; n = 6, p < 0.001). A 10- and 60-min preinfusion of the substrate analogue at concentrations of 50 and 5 microM, respectively, reduced the response of big ET-1 to 9.3 +/- 2.3 mm Hg and 3.6 +/- 1.8 mm Hg (n = 3, p < 0.01 compared to control). [Phe22]-big ET-1[19-37] was inactive against ET-1-induced vasoconstriction (10 pmol) and was devoided of intrinsic vasoactivity. All experiments were performed on kidneys pretreated with SQ-28603 (1 microM), a neutral endopeptidase inhibitor. Our results suggest that [Phe22]-big ET-1[19-37] may be a useful lead molecule for the development of more selective and enzyme-resistant inhibitors of the membrane-bound ECE.
J Cardiovasc Pharmacol 1995
PMID:[Phe22]-big endothelin-1[19-37]: a new and potent inhibitor of the endothelin-converting enzyme. 858 72

Endothelin-converting enzyme (ECE) is a member of the zinc metalloproteinase family. It is much more specific in its protease activity than the bacterial metalloprotease thermolysin; we aim to construct a model of its active site to help to explain these differences. We aligned the sequence of human ECE with those of human neprilysin (which is 39% identical to ECE) and thermolysin. Residues believed to be important for inhibitor binding were assigned from the alignment and by analogy with structural and functional studies of these enzymes. These included a conserved IGG motif N-terminal to the zinc-binding HExxH motif, and a tyrosine residue that may be analogous to Y157 of thermolysin. We have used the program O to build a model of the active site of ECE based on the crystal structure of thermolysin.
J Cardiovasc Pharmacol 1995
PMID:Molecular modeling of the active site of endothelin-converting enzyme. 858 73

We have characterized the endothelin-converting enzyme (ECE)-like activity involved in big endothelin (ET)-1-induced contraction in rabbit saphenous artery (RSA). Big ET-1 30 nM caused a contraction that was independent of the vascular endothelium. Phosphoramidon and the neutral endopeptidase (NEP) inhibitors thiorphan and candoxatrilat blocked the vasoconstriction caused by big ET-1 in endothelium-denuded RSA. Candoxatrilat (IC50 17 nM) and thiorphan (IC50 2.5 nM), were 5- to 30-fold more potent than phosphoramidon (IC50 83 nM). Other protease inhibitors were inactive. In cultured endothelial cells the ET-1 release was inhibited only by phosphoramidon (IC50 16 microM) but at a concentration 200-fold that required an endothelium-denuded RSA. In conclusion, we can speculate that the big ET-1 contraction in RSA is mediated by an ECE, probably present on smooth muscle cells, which is susceptible to NEP inhibitors and is different from the ECE on endothelial cells.
J Cardiovasc Pharmacol 1995
PMID:Characterization of big endothelin-1-induced contraction in rabbit saphenous artery. 858 74

The depressor and renal responses to C-type natriuretic peptide (CNP) were determined in conscious cynomolgus monkeys treated with vehicle or inhibitors of neutral endopeptidase EC 3.4.24.11 (NEP) and angiotensin-converting enzyme (ACE). The NEP inhibitor SQ 28603 (100 mumol/kg intravenously, i.v.) significantly (p < 0.05) enhanced the depressor responses to 1 and 10 nmol/ kg i.v. CNP from -2 +/- 3 to -22 +/- 10 mm Hg and from -16 +/- 4 to -66 +/- 4 mm Hg, respectively. SQ 28603 also significantly increased the cyclic GMP responses to 1 and 10 nmol/kg CNP from 1.4 +/- 1.6 to 11.0 +/- 2.0 nmol/2 h and from 4.2 +/- 0.5 to 53.3 +/- 12.1 nmol/2 h, respectively. Furthermore, the NEP inhibitor significantly increased the natriuretic activity of 1 and 10 nmol/kg i.v. CNP from 235 +/- 99 to 760 +/- 60 microEq/2 h and from 399 +/- 208 to 1,036 +/- 79 microEq/2 h, respectively. A positive correlation between the cumulative natriuretic and cyclic GMP responses suggested a cyclic GMP-mediated mechanism. These data are consistent with the protection of CNP from degradation by renal NEP. Inhibition of ACE by 100 mumol/kg i.v. captopril did not significantly alter the depressor or renal activities of 1 nmol/kg of CNP, neither did it alter the potentiation of CNP activity by SQ 28603. The potentiation of the depressor, cyclic GMP, and natriuretic responses to CNP in nonhuman primates by SQ 28603 suggested that NEP is an important mechanism for in vivo inactivation of natriuretic peptides, including CNP.
J Cardiovasc Pharmacol 1996 Sep
PMID:Renal and depressor activity of C-natriuretic peptide in conscious monkeys: effects of enzyme inhibitors. 887 86


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