Abstract | BACKGROUND: METHODS: After the procedure of coronary ligation, animals were randomized to placebo or carvedilol treatment (5 mg/kg). Action potentials, L-type calcium current (Ica L) and the effect of isoproterenol stimulation on Ica L were measured using whole-cell patch method. Evaluation of the expression of calcium channel subunits was carried out by RT-PCR and Western blot. RESULTS: The results indicate that mean peak Ica L densities (pA/pF) at +10 mV was reduced in postinfarction myocytes (5.33 +/- 0.45, n = 25) compared to sham myocytes (6.52 +/- 0.21, n = 20). Treatment of myocardial infarction rabbits with carvedilol could restore it partially (5.91 +/- 0.39, n = 20, P < 0.05). However, steady-state activation parameters were similar in three groups. With stimulation by isoproterenol (1 micromol/L) Ica L increased in all three groups, but the increase was smaller in postinfarction myocytes. mRNA levels of calcium channel subunit CaA1 gene was decreased but CaB2a, CaB2b and CaB3 mRNA levels did not change after MI. Corresponding change in CaA1 protein was also observed. CONCLUSIONS: The results demonstrate that carvedilol restores Ica L density and reverse the downregulation of CaA1 postinfarction.
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Authors | Xia Li, Cong-Xin Huang, Hong Jiang, Feng Cao, Teng Wang |
Journal | Chinese medical journal
(Chin Med J (Engl))
Vol. 118
Issue 5
Pg. 377-82
(Mar 05 2005)
ISSN: 0366-6999 [Print] China |
PMID | 15780206
(Publication Type: Journal Article)
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Chemical References |
- Adrenergic beta-Antagonists
- Calcium Channels, L-Type
- Carbazoles
- Propanolamines
- Carvedilol
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Topics |
- Action Potentials
(drug effects)
- Adrenergic beta-Antagonists
(pharmacology)
- Animals
- Calcium Channels, L-Type
(biosynthesis, genetics, metabolism)
- Carbazoles
(pharmacology)
- Carvedilol
- Male
- Myocardial Infarction
(metabolism, physiopathology)
- Propanolamines
(pharmacology)
- Rabbits
- Random Allocation
- Ventricular Remodeling
(drug effects)
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