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Updated: Aug 18, 2026
Simultaneous Assessment of Cardiomyocyte DNA Synthesis and Ploidy: A Method to Assist Quantification of Cardiomyocyte Regeneration and Turnover
Published on: May 23, 2016
Effects of adriamycin on DNA synthesis in mouse and rat heart
Abstract:
Adriamycin induces an inhibition of DNA synthesis in mouse tissues within one hr after treatment. While the effects are short-lived in liver and small intestine, DNA synthesis in heart remains below control values for up to 7 days. After this period DNA synthesis in hearts of treated mice is elevated and remains above control values for as long as 4 weeks. Both 1-beta-D-arabinofuranosylcytosine and actinomycin D also induce inhibition of cardiac DNA synthesis soon after treatment; the effects of 1-beta-D-arabinofuranosylcytosine are over by the end of 24 hr while the effects of actinomycin D persist for at least 4 days. Actinomycin D treatment also induces an "over-shoot" of DNA synthesis in mouse heart. Adriamycin can induce a loss of prelabeled DNA from heart, although no pathological alterations are immediately obvious. The small intestine, however, shows extensive karyorrhexis. The initial effects on cardiac DNA synthesis occur in adrenalectomized animals, indicating that the effects are not mediated via the adrenal gland. We did find, however, that DNA synthesis in heart was sensitive to the effects of starvation. The results of this study indicate that inhibition of mouse heart DNA synthesis is not specific for Adriamycin and that the effects of Adriamycin in heart following a single treatment are long-lived.
Insights
Adriamycin and other drugs inhibit mouse heart DNA synthesis initially. Cardiac DNA synthesis remains suppressed for days, followed by a prolonged elevation, indicating long-lasting effects.
Area of Science:
- Cardiovascular Research
- Molecular Biology
- Pharmacology
Background:
- Adriamycin is a chemotherapy drug known to affect DNA synthesis.
- The long-term effects of Adriamycin on cardiac DNA synthesis require further investigation.
Purpose of the Study:
- To investigate the effects of Adriamycin and other DNA-synthesis-inhibiting drugs on mouse cardiac DNA synthesis.
- To determine the duration and nature of these effects, including potential over-shoot phenomena and underlying mechanisms.
Main Methods:
- Mice were treated with Adriamycin, 1-beta-D-arabinofuranosylcytosine, or actinomycin D.
- DNA synthesis was measured in various tissues, including the heart, liver, and small intestine.
- Effects were assessed in adrenalectomized and starved mice.
Main Results:
- Adriamycin rapidly inhibited cardiac DNA synthesis, with effects persisting for up to 7 days, followed by elevated synthesis for 4 weeks.
- Other drugs also inhibited cardiac DNA synthesis, with varying durations.
- Actinomycin D induced an 'over-shoot' of DNA synthesis in the heart.
- Cardiac DNA loss was observed, while the small intestine showed karyorrhexis.
- Effects were independent of the adrenal gland but sensitive to starvation.
Conclusions:
- Inhibition of mouse heart DNA synthesis by Adriamycin is not specific and has long-lasting effects.
- Cardiac DNA synthesis is sensitive to various chemotherapeutic agents and physiological conditions like starvation.
