[Effects of daunorubicin on the expression of brain natriuretic peptide gene in myocardial cells: an in vitro experiment with cultured myocardial cells from rats].
OBJECTIVE
To investigate the effects of daunorubicin (DNR) on the gene expression of brain natriuretic peptide (BNP) in myocardial cells.


METHODS
Myocardial cells were isolated from neonatal Wistar rats, cultured, and added with DNR of the concentrations of 0, 0.02, 0.2, and 2 mg/L respectively so as to calculate the maximum non-toxic concentration of DNR. The cultured rat myocardial cells were divided into 3 groups, DNR group, added with DNR 0.2 mg/L, DNR+fructose-1, 6-diphosphate (FDP) group, added with DNR 0.2 mg/L and FDP 2 mg/ml, and control group. The viability of the myocardial cells was examined by MTT method. RT-PCR and Western blotting were used to detect the mRNA expression and protein expression of the BNP gene.


RESULTS
Toxicity test showed that the maximum non-toxic concentration of DNR was 0.2 mg/L. Western blotting showed that the average grey level ratio of BNP/GAPDH of the DNR group was 0.40+/-0.09, not significantly different from that of the DNR+FDP group (0.42+/-0.11, but significantly lower than that of the control group (0.82+/-0.13, P<0.01).


CONCLUSIONS
DNR suppresses the expression of BNP gene in myocardial cells and FDP cannot reverse the suppressing effect.
Department of Pediatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
Cong-jun
CJ
Wang
Ya-li
YL
Liu
Hua
H
Peng
D000818:Animals; D000831:Animals, Newborn; D000903:Antibiotics, Antineoplastic / Q000494:pharmacology; D015153:Blotting, Western; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D003630:Daunorubicin / Q000494:pharmacology*; D015870:Gene Expression / Q000187:drug effects; D008297:Male; D032383:Myocytes, Cardiac / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D020097:Natriuretic Peptide, Brain / Q000096:biosynthesis* / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D020133:Reverse Transcriptase Polymerase Chain Reaction
D000903:Antibiotics, Antineoplastic; D012333:RNA, Messenger; D020097:Natriuretic Peptide, Brain; D003630:Daunorubicin