[Expression of NOS III mRNA in different tissues of spontaneously hypertensive rats using RNA array].
To evaluate the expression of nitric oxide synthase III (NOS III) mRNA in the heart, aorta, kidney and liver of spontaneously hypertensive rats (SHR).



Two hundred and ninety-four total RNA samples were obtained from the tissues of ventricle, aortic smooth muscle, kidney and liver of SHR and normotensive rats (Wistar-Kyoto rats, WKY). RNA array was used to determine the mRNA levels of NOS III of the two groups.



Compared with WKY, the systolic blood pressure increased significantly in SHR at 6-week-old, 8-week-old, 10-week-old and 12-week-old [(158.50 +/-7.69 vs 108.67 +/-5.89) mmHg, (174.33 +/-4.46 vs 128.50 +/-4.97) mmHg, (198.00 +/-13.45 vs 142.00 +/-3.58) mmHg, (216.67 +/-8.91 vs 141.17 +/-4.92) mmHg, P<0.01], and the ventricle/body weight ratio was significant higher at 10-week-old and 12-week-old [(4.08 +/-0.17 vs 3.59 +/-0.11, 4.05 +/-0.18 vs 3.40 +/-0.19)mg/g, P<0.01]. In the heart tissue and the kidney, the mRNA levels of NOS III were significantly increased at 6-week-old, 8-week-old, 10-week-old and 12-week-old (1.12 +/-0.18 vs 0.90 +/- 0.15, 1.46 +/- 0.34 vs 1.06 +/-0.18, 1.66 +/- 0.31 vs 1.21 +/- 0.30, 1.98 +/- 0.40 vs 1.31 +/-0.38, P <0.05) and at 4-week-old, 6-week-old, 8-week-old, 10-week-old and 12-week-old (1.10 +/- 0.21 vs 0.81 +/-0.11, 1.28 +/-0.18 vs 0.95 +/-0.13,1.31 +/-0.23 vs 0.99 +/-0.23, 1.70 +/-0.30 vs 1.08 +/-0.25, 1.83 +/-0.33 vs 1.15 +/-0.20, P<0.05 or P<0.01), respectively. There was no significant difference of the NOS III expression in the liver and no significant signals were detected in the aortic smooth muscle.



The results provide the evidence of the increased expression of NOS III in different tissues in SHR and suggests the progressive nature of essential hypertension.
The First Affiliated Hospital, College of Medicine, Zhejiang University Hangzhou 310003, China.
Nai-yun
NY
Chen
Shen-jiang
SJ
Hu
Hai-tao
HT
Dong
D000818:Animals; D006973:Hypertension / Q000201:enzymology* / Q000235:genetics*; D007668:Kidney / Q000201:enzymology; D008099:Liver / Q000201:enzymology; D008297:Male; D009206:Myocardium / Q000201:enzymology; D019001:Nitric Oxide Synthase / Q000096:biosynthesis* / Q000235:genetics; D052250:Nitric Oxide Synthase Type III; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D051381:Rats; D011918:Rats, Inbred SHR; D011921:Rats, Inbred WKY
D012333:RNA, Messenger; D019001:Nitric Oxide Synthase; D052250:Nitric Oxide Synthase Type III; C496316:Nos3 protein, rat