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Titolo:
The cardioprotective effects of a new 1,4-benzothiazepine derivative, JTV519, on ischemia/reperfusion-induced Ca2+ overload in isolated rat hearts
Autore:
Inagaki, K; Kihara, Y; Izumi, T; Sasayama, S;
Indirizzi:
Kyoto Univ, Grad Sch Med, Dept Cardiovasc Med, Sakyo Ku, Kyoto 6068507, Japan Kyoto Univ Kyoto Japan 6068507 ovasc Med, Sakyo Ku, Kyoto 6068507, Japan
Titolo Testata:
CARDIOVASCULAR DRUGS AND THERAPY
fascicolo: 5, volume: 14, anno: 2000,
pagine: 489 - 495
SICI:
0920-3206(200009)14:5<489:TCEOAN>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
PROTEIN-KINASE-C; INTRACELLULAR CALCIUM; VENTRICULAR MYOCYTES; STUNNED MYOCARDIUM; ISCHEMIA; CONTRACTION; REPERFUSION; TRANSIENTS; PHYSIOLOGY; K201;
Keywords:
JTV519; reperfusion; calcium; ischemia;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Kihara, Y Kyoto Univ, Grad Sch Med, Dept Cardiovasc Med, Sakyo Ku, 54 Shogoin, Kyoto6068507, Japan Kyoto Univ 54 Shogoin Kyoto Japan 6068507 , Kyoto6068507, Japan
Citazione:
K. Inagaki et al., "The cardioprotective effects of a new 1,4-benzothiazepine derivative, JTV519, on ischemia/reperfusion-induced Ca2+ overload in isolated rat hearts", CARDIO DRUG, 14(5), 2000, pp. 489-495

Abstract

A new 1,4-benzothiazepine derivative, JTV519 (JTV), has strong protective effects against isoproterenol-induced myocardial injury. We investigated the effects of JTV on Ca2+ overload and on functional recovery during ischemia/reperfusion in isolated coronary-perfused rat hearts. After 30 minutes ofreperfusion following 30 min of global ischemia, the % recovery of LV developed pressure was improved in a concentration-dependent manner when JTV (0.3-3.0 mu M) was administered either 5 min before induction of ischemia or for 5 min at the time of reperfusion only JTV showed a negative inotropic effect only at concentrations above 3.0 mu M. In indol-loaded isolated heartpreparations, 0.3 mu M JTV did not affect the preischemic systolic or diastolic Ca2+ levels of the Ca2+ transient as measured by the ratio of 2-wavelength fluormetry (R405/500). In contrast, it significantly reduced the increase in the ratio in the postischemic reperfusion period (% change of R405/500 from baseline: JTV(-), by 42.7 +/- 3.2%; JTV(+), by 18.4 +/- 9.1%, p < 0.05). In isolated rat ventricular myocytes with a standard patch-clamp method, we further tested the interaction of JTV with the L-type Ca2+ channel (I-Ca). The % inhibition of the peak current of I-Ca was 6.2 +/- 0.8% at 0.3 mu M (p = n.s.), 22.0 +/- 3.3% at 1.0 mu M (p < 0.05), and 59.6 +/- 1.4% at 3.0 mu M (p < 0.01). Thus, the marked cardioprotection due to JTV at 0.3mu M may not be solely attributed to its inhibitory effect on the transsarcolemmal Ca2+ influx through I-Ca. In conclusion, JTV519 is a novel pharmacological agent that has been demonstrated for the first time to have clinical potential for the treatment of acute coronary syndrome by its efficacy in administration at the time of reperfusion, by its suppression of reperfusion-related intracellular Ca2+ overload with no significant interaction with I-Ca, and by its subsequent ability of strong myocardial protection.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 19:30:34