| Id |
Subject |
Object |
Predicate |
Lexical cue |
| T1 |
0-93 |
Sentence |
denotes |
Mechanisms of hypertension induced by nitric oxide (NO) deficiency: focus on venous function. |
| T2 |
94-199 |
Sentence |
denotes |
Loss of endothelial cell-derived nitric oxide (NO) in hypertension is a hallmark of arterial dysfunction. |
| T3 |
200-340 |
Sentence |
denotes |
Experimental hypertension created by the removal of NO, however, involves mechanisms in addition to decreased arterial vasodilator activity. |
| T4 |
341-478 |
Sentence |
denotes |
These include augmented endothelin-1 (ET-1) release, increased sympathetic nervous system activity, and elevated tissue oxidative stress. |
| T5 |
479-633 |
Sentence |
denotes |
We hypothesized that increased venous smooth muscle (venomotor) tone plays a role in Nomega-nitro-L-arginine (LNNA) hypertension through these mechanisms. |
| T6 |
634-728 |
Sentence |
denotes |
Rats were treated with the NO synthase inhibitor LNNA (0.5 g/L in drinking water) for 2 weeks. |
| T7 |
729-843 |
Sentence |
denotes |
Mean arterial pressure of conscious rats was 119 +/- 2 mm Hg in control and 194 +/- 5 mm Hg in LNNA rats (P<0.05). |
| T8 |
844-929 |
Sentence |
denotes |
Carotid arteries and vena cava were removed for measurement of isometric contraction. |
| T9 |
930-1118 |
Sentence |
denotes |
Maximal contraction to norepinephrine was modestly reduced in arteries from LNNA compared with control rats whereas the maximum contraction to ET-1 was significantly reduced (54% control). |
| T10 |
1119-1248 |
Sentence |
denotes |
Maximum contraction of vena cava to norepinephrine (37% control) also was reduced but no change in response to ET-1 was observed. |
| T11 |
1249-1387 |
Sentence |
denotes |
Mean circulatory filling pressure, an in vivo measure of venomotor tone, was not elevated in LNNA hypertension at 1 or 2 weeks after LNNA. |
| T12 |
1388-1604 |
Sentence |
denotes |
The superoxide scavenger tempol (30, 100, and 300 micromol kg(-1), IV) did not change arterial pressure in control rats but caused a dose-dependent decrease in LNNA rats (-18 +/- 8, -26 +/- 15, and -54 +/- 11 mm Hg). |
| T13 |
1605-1779 |
Sentence |
denotes |
Similarly, ganglionic blockade with hexamethonium caused a significantly greater fall in LNNA hypertensive rats (76 +/- 9 mm Hg) compared with control rats (35 +/- 10 mm Hg). |
| T14 |
1780-1924 |
Sentence |
denotes |
Carotid arteries, vena cava, and sympathetic ganglia from LNNA rats had higher basal levels of superoxide compared with those from control rats. |
| T15 |
1925-2142 |
Sentence |
denotes |
These data suggest that while NO deficiency increases oxidative stress and sympathetic activity in both arterial and venous vessels, the impact on veins does not make a major contribution to this form of hypertension. |