Tags

Type your tag names separated by a space and hit enter

Apoptotic and necrotic myocyte cell deaths are independent contributing variables of infarct size in rats.
Lab Invest. 1996 Jan; 74(1):86-107.LI

Abstract

Programmed cell death in the myocardium has been linked to ischemia reperfusion injury as well as to excessive mechanical forces associated with increases in ventricular loading. Moreover, hypoxia activates the suicide program of cardiac myocytes in vitro. Because the supplied portion of the ventricular wall is ischemic and subjected to high levels of systolic and diastolic stresses (acutely after coronary artery occlusion), apoptosis and necrosis may contribute independently to myocyte cell death after infarction. Therefore, myocardial infarction was produced in rats, and, after the determination of ventricular hemodynamics, the contribution of apoptotic and/or necrotic myocyte cell death to infarct size was measured quantitatively from 20 minutes to 7 days after coronary artery occlusion. Programmed cell death was assessed by the terminal deoxynucleotidyl transferase assay and by the electrophoretic detection of DNA laddering. Myocyte necrosis was evaluated by myosin monoclonal Ab labeling. Moreover, the expression of Bcl-2, Bax, and Fas proteins in myocytes was examined by immunocytochemistry. Myocyte cell death by apoptosis and necrosis comprised nearly 3 million myocytes at 2 hours. Apoptotic cell death involved 2.8 million cells and necrotic cell death only 90,000 myocytes. Apoptosis continued to represent the major independent form of myocyte cell death, affecting 6.6 million myocytes at 4.5 hours. Myocyte necrosis peaked at 1 day, including 1.1 million myocytes. DNA electrophoretic analysis confirmed these observations by showing nucleosomal ladders at 2-3 hours, 4.5 hours, 1 day, and 2 days after coronary artery occlusion. Myocytes showing both DNA strand breaks and myosin labeling were a prominent aspect of myocardial damage only after 6 hours. Finally, the expression of Bcl-2 and Fas in myocytes increased 18-fold and 131-fold, respectively. In conclusion, programmed myocyte cell death is the major form of myocardial damage produced by occlusion of a major epicardial coronary artery, whereas necrotic myocyte cell death follows apoptosis and contributes to the progressive loss of cells with time after infarction. The enhanced expression of Fas may be implicated in the activation of apoptosis in spite of the increase in Bcl-2, which tends to preserve cell survival.

Authors+Show Affiliations

Department of Medicine, New York Medical College, Valhalla 10595, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

8569201

Citation

Kajstura, J, et al. "Apoptotic and Necrotic Myocyte Cell Deaths Are Independent Contributing Variables of Infarct Size in Rats." Laboratory Investigation; a Journal of Technical Methods and Pathology, vol. 74, no. 1, 1996, pp. 86-107.
Kajstura J, Cheng W, Reiss K, et al. Apoptotic and necrotic myocyte cell deaths are independent contributing variables of infarct size in rats. Lab Invest. 1996;74(1):86-107.
Kajstura, J., Cheng, W., Reiss, K., Clark, W. A., Sonnenblick, E. H., Krajewski, S., Reed, J. C., Olivetti, G., & Anversa, P. (1996). Apoptotic and necrotic myocyte cell deaths are independent contributing variables of infarct size in rats. Laboratory Investigation; a Journal of Technical Methods and Pathology, 74(1), 86-107.
Kajstura J, et al. Apoptotic and Necrotic Myocyte Cell Deaths Are Independent Contributing Variables of Infarct Size in Rats. Lab Invest. 1996;74(1):86-107. PubMed PMID: 8569201.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Apoptotic and necrotic myocyte cell deaths are independent contributing variables of infarct size in rats. AU - Kajstura,J, AU - Cheng,W, AU - Reiss,K, AU - Clark,W A, AU - Sonnenblick,E H, AU - Krajewski,S, AU - Reed,J C, AU - Olivetti,G, AU - Anversa,P, PY - 1996/1/1/pubmed PY - 1996/1/1/medline PY - 1996/1/1/entrez SP - 86 EP - 107 JF - Laboratory investigation; a journal of technical methods and pathology JO - Lab Invest VL - 74 IS - 1 N2 - Programmed cell death in the myocardium has been linked to ischemia reperfusion injury as well as to excessive mechanical forces associated with increases in ventricular loading. Moreover, hypoxia activates the suicide program of cardiac myocytes in vitro. Because the supplied portion of the ventricular wall is ischemic and subjected to high levels of systolic and diastolic stresses (acutely after coronary artery occlusion), apoptosis and necrosis may contribute independently to myocyte cell death after infarction. Therefore, myocardial infarction was produced in rats, and, after the determination of ventricular hemodynamics, the contribution of apoptotic and/or necrotic myocyte cell death to infarct size was measured quantitatively from 20 minutes to 7 days after coronary artery occlusion. Programmed cell death was assessed by the terminal deoxynucleotidyl transferase assay and by the electrophoretic detection of DNA laddering. Myocyte necrosis was evaluated by myosin monoclonal Ab labeling. Moreover, the expression of Bcl-2, Bax, and Fas proteins in myocytes was examined by immunocytochemistry. Myocyte cell death by apoptosis and necrosis comprised nearly 3 million myocytes at 2 hours. Apoptotic cell death involved 2.8 million cells and necrotic cell death only 90,000 myocytes. Apoptosis continued to represent the major independent form of myocyte cell death, affecting 6.6 million myocytes at 4.5 hours. Myocyte necrosis peaked at 1 day, including 1.1 million myocytes. DNA electrophoretic analysis confirmed these observations by showing nucleosomal ladders at 2-3 hours, 4.5 hours, 1 day, and 2 days after coronary artery occlusion. Myocytes showing both DNA strand breaks and myosin labeling were a prominent aspect of myocardial damage only after 6 hours. Finally, the expression of Bcl-2 and Fas in myocytes increased 18-fold and 131-fold, respectively. In conclusion, programmed myocyte cell death is the major form of myocardial damage produced by occlusion of a major epicardial coronary artery, whereas necrotic myocyte cell death follows apoptosis and contributes to the progressive loss of cells with time after infarction. The enhanced expression of Fas may be implicated in the activation of apoptosis in spite of the increase in Bcl-2, which tends to preserve cell survival. SN - 0023-6837 UR - https://www.unboundmedicine.com/medline/citation/8569201/Apoptotic_and_necrotic_myocyte_cell_deaths_are_independent_contributing_variables_of_infarct_size_in_rats_ L2 - http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=8569201.ui DB - PRIME DP - Unbound Medicine ER -