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Cardiovascular Research 1998 38(2):405-413; doi:10.1016/S0008-6363(98)00005-4
© 1998 by European Society of Cardiology
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Copyright © 1998, European Society of Cardiology

Molecular cloning and expression of inducible nitric oxide synthase in chick embryonic ventricular myocytes

Tatsuya Shimizua, Koh-ichiro Kinugawaa, Yasuyuki Sugishitaa, Kazuro Sugishitaa, Kazumasa Haradaa, Hiroshi Matsuia, Osami Kohmotob, Takashi Serizawab and Toshiyuki Takahashia,*

aThe Second Department of Internal Medicine, Faculty of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
bThe Second Department of Internal Medicine, Saitama Medical School, 38 Morohongo, Moroyama Irumagun, Saitama 350-04, Japan

* Corresponding author. Tel. +81 (3) 3815 5411 ext. 3076; Fax +81 (3) 3814 0021; E-mail: takahashit-2im@h.u-tokyo.ac.jp

Objective: Inducible nitric oxide synthase (iNOS) has been implicated to contribute to myocardial dysfunction in various settings, but considerable species differences have been noted in the levels of iNOS expression and its function in several tissues. The aim of this study was to elucidate evolutional changes in myocardial iNOS expression and function. Methods: An iNOS cDNA clone was isolated by RT-PCR from the 10-day old cultured chick embryonic ventricular myocytes stimulated with 10 µg/ml of lipopolysaccharide. Expression of the iNOS mRNA was analyzed with Northern blot analysis and RNase protection assay. The iNOS activity was estimated from conversion rates of L-arginine to L-citrulline and intracellular cGMP contents were measured with radioimmunoassay. Furthermore, both [Ca2+]i (fluorescent dye indo-1) and cell contraction (video motion detector) were simultaneously recorded. Results: Aside from the primer sequences, the insert (1026 bp) of the cDNA clone showed 66.4% identity at the deduced amino acid level to the human iNOS cDNAs. Northern blot analysis revealed that chicken iNOS mRNA of approximately 4.5 kb was induced by lipopolysaccharide within 6 h in the cultured myocytes. RNase protection assay also showed that lipopolysaccharide provoked 14.6±5.1-fold increases (n=6, p<0.05) in the iNOS mRNA signals within 6 h. The iNOS activity (+300%, P<0.05) as well as the intracellular cGMP contents (+75%, P<0.01) were significantly augmented in the lipopolysaccharide-stimulated cells. Both the cell contraction and [Ca2+]i were significantly reduced after the administration of a large amount (10 mM) of L-arginine in the myocytes pretreated with both lipopolysaccharide and NG-monomethyl-L-arginine (100 µM). Conclusion: As like as the nucleotide and amino acid sequences, the myocardial effects of the iNOS may also be evolutionary conserved.

KEYWORDS Experimental; Heart; Molecular biology; Cell culture/isolation; Calcium (cellular); Myocytes; Nitric oxide; Contractile function


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