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. 1995 May;115(2):373–379. doi: 10.1111/j.1476-5381.1995.tb15888.x

Effects of endothelin receptor antagonism with bosentan on peripheral nerve function in experimental diabetes.

E J Stevens 1, D R Tomlinson 1
PMCID: PMC1908327  PMID: 7670740

Abstract

1. The effects of the non-selective endothelin (ET) receptor (ETA/ETB) antagonist, bosentan, on sciatic nerve dysfunction in experimental diabetes were investigated. 2. Rats with 5-6 weeks untreated streptozotocin-diabetes exhibited characteristic slowed motor nerve conduction velocity (mean +/- s.d., 36.6 +/- 3.4 m s-1) and nerve laser Doppler flux (197 +/- 64 arbitrary units) compared to age-matched control animals (42.7 +/- 2.4 m s-1 and 398 +/- 77 arbitrary units, respectively). Preventative treatment of diabetic rats with bosentan at 100 mg kg-1 day-1 p.o. attenuated both these deficits (39.7 +/- 3.0 m s-1 and 305 +/- 56 arbitrary units, respectively) without affecting mean arterial pressure. 3. In control and untreated diabetic rats, ET-1, 1 nmol kg-1 i.v., caused an initial hypotension (duration, 30 +/- 13 and 26 +/- 9 s, respectively; change in mean arterial pressure, -27 +/- 13 and -25 +/- 7 mmHg, respectively) followed by prolonged hypertension (change in mean arterial pressure, 52 +/- 18 and 31 +/- 5 mmHg, respectively). Effectiveness of the chronic bosentan treatment was demonstrated by inhibition of the hypotensive response to ET-1 in treated diabetic rats (duration, 5 +/- 2 s; change in mean arterial pressure, -4 +/- 2 mmHg) although the hypertension was unaltered (change in mean arterial pressure, 32 +/- 9 mmHg). 4. Acute i.v. administration of 10 mg kg-1 bosentan caused variable and transient rises in nerve laser Doppler flux in control (78 +/- 63 arbitrary units) and untreated diabetic rats (93 +/- 77 arbitrary units).(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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