Effect of doxorubicin on postrest contraction in isolated rat hearts. 1995

J Asayama, and T Tanaka, and T Tatsumi, and C Nakagawa, and M Kobara, and S Matoba, and B Ohta, and D Inoue, and M Nakagawa
Second Department of Medicine, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Japan.

Clinical use of doxorubicin is limited by its cardiotoxicity. In doxorubicin-induced cardiomyopathy, vacuolization of the sarcoplasmic reticulum (SR) has been reported. We investigated whether doxorubicin had a direct action on the sarcoplasmic reticulum (SR) in isolated perfused rat hearts. The left and right atria were trimmed to maintain heart rate (HR) <200 beats/min. Postrest contractions, which are believed to be due primarily to Ca2+ release from the SR, were evoked with a programmable stimulator after variable rest intervals. The amplitude of the postrest contractions increased markedly as the rest interval increased. Doxorubicin (0.1 mM) significantly suppressed this potentiation of the postrest contractions. Furthermore, doxorubicin slowly induced aftercontractions and an increase in left ventricular diastolic pressure (LVDP), phenomena that are usually associated with ouabain intoxication. We conclude that doxorubicin-induced cardiomyopathy may be due to SR dysfunction, leading to intracellular Ca2+ overload.

UI MeSH Term Description Entries
D009200 Myocardial Contraction Contractile activity of the MYOCARDIUM. Heart Contractility,Inotropism, Cardiac,Cardiac Inotropism,Cardiac Inotropisms,Contractilities, Heart,Contractility, Heart,Contraction, Myocardial,Contractions, Myocardial,Heart Contractilities,Inotropisms, Cardiac,Myocardial Contractions
D002110 Caffeine A methylxanthine naturally occurring in some beverages and also used as a pharmacological agent. Caffeine's most notable pharmacological effect is as a central nervous system stimulant, increasing alertness and producing agitation. It also relaxes SMOOTH MUSCLE, stimulates CARDIAC MUSCLE, stimulates DIURESIS, and appears to be useful in the treatment of some types of headache. Several cellular actions of caffeine have been observed, but it is not entirely clear how each contributes to its pharmacological profile. Among the most important are inhibition of cyclic nucleotide PHOSPHODIESTERASES, antagonism of ADENOSINE RECEPTORS, and modulation of intracellular calcium handling. 1,3,7-Trimethylxanthine,Caffedrine,Coffeinum N,Coffeinum Purrum,Dexitac,Durvitan,No Doz,Percoffedrinol N,Percutaféine,Quick-Pep,Vivarin,Quick Pep,QuickPep
D002118 Calcium A basic element found in nearly all tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes. Coagulation Factor IV,Factor IV,Blood Coagulation Factor IV,Calcium-40,Calcium 40,Factor IV, Coagulation
D004317 Doxorubicin Antineoplastic antibiotic obtained from Streptomyces peucetius. It is a hydroxy derivative of DAUNORUBICIN. Adriamycin,Adriablastin,Adriablastine,Adriblastin,Adriblastina,Adriblastine,Adrimedac,DOXO-cell,Doxolem,Doxorubicin Hexal,Doxorubicin Hydrochloride,Doxorubicin NC,Doxorubicina Ferrer Farm,Doxorubicina Funk,Doxorubicina Tedec,Doxorubicine Baxter,Doxotec,Farmiblastina,Myocet,Onkodox,Ribodoxo,Rubex,Urokit Doxo-cell,DOXO cell,Hydrochloride, Doxorubicin,Urokit Doxo cell
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D000903 Antibiotics, Antineoplastic Chemical substances, produced by microorganisms, inhibiting or preventing the proliferation of neoplasms. Antineoplastic Antibiotics,Cytotoxic Antibiotics,Antibiotics, Cytotoxic
D012519 Sarcoplasmic Reticulum A network of tubules and sacs in the cytoplasm of SKELETAL MUSCLE FIBERS that assist with muscle contraction and relaxation by releasing and storing calcium ions. Reticulum, Sarcoplasmic,Reticulums, Sarcoplasmic,Sarcoplasmic Reticulums
D017207 Rats, Sprague-Dawley A strain of albino rat used widely for experimental purposes because of its calmness and ease of handling. It was developed by the Sprague-Dawley Animal Company. Holtzman Rat,Rats, Holtzman,Sprague-Dawley Rat,Rats, Sprague Dawley,Holtzman Rats,Rat, Holtzman,Rat, Sprague-Dawley,Sprague Dawley Rat,Sprague Dawley Rats,Sprague-Dawley Rats
D051381 Rats The common name for the genus Rattus. Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus
D066298 In Vitro Techniques Methods to study reactions or processes taking place in an artificial environment outside the living organism. In Vitro Test,In Vitro Testing,In Vitro Tests,In Vitro as Topic,In Vitro,In Vitro Technique,In Vitro Testings,Technique, In Vitro,Techniques, In Vitro,Test, In Vitro,Testing, In Vitro,Testings, In Vitro,Tests, In Vitro,Vitro Testing, In

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