EIPA - CAS 1154-25-2
Category: Inhibitor
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Molecular Formula:
Molecular Weight:
TRP Channel
EIPA is a TRPP3 channel inhibitor (IC50 = 10.5 μM). EIPA also acts as an Na+/H+ exchange inhibitor that suppresses the Na+/H+ exchanger (NHE).
Brife Description:
TRPP3 channel inhibitor, NHE inhibitor
≥98% by HPLC
Light Yellow to Light Green Solid
Ethylisopropylamiloride; L 593754; MH 12-43; 3-Amino-N-(aminoiminomethyl)-6-chloro-5-[ethyl(1-methylethyl)amino]-2-pyrazinecarboxamide
Melting Point:
Canonical SMILES:
1.A crosstalk between Na⁺ channels, Na⁺/K⁺ pump and mitochondrial Na⁺ transporters controls glucose-dependent cytosolic and mitochondrial Na⁺ signals.
Nita II;Hershfinkel M;Lewis EC;Sekler I Cell Calcium. 2015 Feb;57(2):69-75. doi: 10.1016/j.ceca.2014.12.007. Epub 2014 Dec 18.
Glucose-dependent cytosolic Na(+) influx in pancreatic islet β cells is mediated by TTX-sensitive Na(+) channels and is propagated into the mitochondria through the mitochondrial Na(+)/Ca(2+) exchanger, NCLX. Mitochondrial Na(+) transients are also controlled by the mitochondrial Na(+)/H(+) exchanger, NHE, while cytosolic Na(+) changes are governed by Na(+)/K(+) ATPase pump. The functional interaction between the Na(+) channels, Na(+)/K(+) ATPase pump and mitochondrial Na(+) transporters, NCLX and NHE, in mediating Na(+) signaling is poorly understood. Here, we combine fluorescent Na(+) imaging, pharmacological inhibition by TTX, ouabain and EIPA, with molecular control of NCLX expression, so as to investigate the crosstalk between Na(+) transporters on both the plasma membrane and the mitochondria. According to our results, glucose-dependent cytosolic Na(+) response was enhanced by ouabain and was followed by a rise in mitochondrial Na(+) signal. Silencing of NCLX expression using siNCLX, did not affect the glucose- or ouabain-dependent cytosolic rise in Na(+). In contrast, the ouabain-dependent rise in mitochondrial Na(+) was strongly suppressed by siNCLX. Furthermore, mitochondrial Na(+) influx rates were accelerated in cells treated with the Na(+)/H(+) exchanger inhibitor, EIPA or by combination of EIPA and ouabain.
2.Intracellular pH regulation in resting and contracting segments of rat mesenteric resistance vessels.
Aalkjaer C;Cragoe EJ Jr J Physiol. 1988 Aug;402:391-410.
1. The pH-sensitive dye 2',7'-bis-(2-carboxyethyl)-5 (and -6)-carboxyfluorescein (BCECF) was used to measure intracellular pH (pHi) in segments of rat resistance vessels (internal diameter about 200 microns) with the vessels mounted in a myograph for simultaneous measurements of isometric contraction. 2. BCECF loaded slowly into the vessels over 1 h and did not affect the maximal contractility of the vessels. There was a loss of dye with time which, however, was very slow when the segments were only excited for 2 s/min, suggesting that the loss was mainly due to dye bleaching with only a very slow leak. 3. The ratio of the emissions (at 540 nm) with excitation at 495 and 450 nm was calibrated in terms of pH using the K+-H+ ionophore nigericin. This calibration gave a pHi value of 7.15 +/- 0.02 (n = 20), suggesting that hydrogen ions are not in electrochemical equilibrium in these vascular smooth muscles which have a membrane potential of about -60 mV. 4. Addition of 10 mM-NH4Cl caused a transient alkalinization and wash-out of 10 mM-NH4Cl a transient acidification. Increasing CO2 with maintained bicarbonate caused a rapid acidification followed by an incomplete recovery. Removal of CO2 and bicarbonate (HEPES-buffered solution) with constant extracellular pH caused a transient alkalinization but steady-state pHi was not significantly altered.
3.Oxidative stress and the genomic regulation of aldosterone-stimulated NHE1 activity in SHR renal proximal tubular cells.
Pinto V;Pinho MJ;Hopfer U;Jose PA;Soares-da-Silva P Mol Cell Biochem. 2008 Mar;310(1-2):191-201. Epub 2007 Dec 20.
This study evaluated the effects of aldosterone upon Na+/H+ exchange (NHE) activity in immortalized proximal tubular epithelial (PTE) cells from the spontaneously hypertensive rat (SHR) and the normotensive controls (Wistar Kyoto rat; WKY). Increases in NHE activity after exposure to aldosterone occurred in time- and concentration-dependent manner in SHR PTE cells, but not in WKY PTE cells. The aldosterone-induced increases in NHE activity were prevented by spironolactone, but not by the glucocorticoid receptor antagonist Ru 38486. The presence of the mineralocorticoid receptor transcript was confirmed by PCR and NHE1, NHE2, and NHE3 proteins were detected by immunoblot analysis. Cariporide and EIPA, but not S3226, inhibited the aldosterone-induced increase in NHE activity, indicating that NHE1 is the most likely involved NHE isoform. Pretreatment of SHR PTE cells with actinomycin D attenuated the aldosterone-induced increases in NHE activity. The SHR PTE cells had an increased rate of H2O2 production when compared with WKY PTE cells. Treatment of cells with apocynin, a NADPH oxidase inhibitor, markedly reduced the rate of H2O2 production. The aldosterone-induced increase in NHE activity SHR PTE cells was completely prevented by apocynin.
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