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Cardiovascular effects of central injection of acetylcholine in anaesthetized dogs: a role for vasopressin release
Author(s) -
Rascol Olivier,
Montastruc JeanLouis,
Gauquelin Guillemette,
Tran MarieAntoinette,
Geelen Ghislaine,
Gharib Claude,
Montastruc Paul
Publication year - 1990
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.1990.tb15831.x
Subject(s) - acetylcholine , vasopressin , medicine , endocrinology , diabetes insipidus , blood pressure , plasma renin activity , renin–angiotensin system
1 The effect of an intracisternal injection of 20 μg kg −1 of acetylcholine was studied on systolic and diastolic blood pressures, heart rate, and plasma levels of noradrenaline, adrenaline, vasopressin, plasma renin activity and atrial natriuretic factor in chloralose‐anaesthetized dogs, 8 of which were normal and 7 with diabetes insipidus (deprived of vasopressin secretion by surgical lesion of the hypothalamoneurohypophysial system). 2 Acetylcholine significantly increased systolic and diastolic blood pressures in both groups of animals. However, the rise in blood pressure was significantly shorter lived in the dogs with diabetes insipidus. 3 Acetylcholine significantly increased plasma levels of noradrenaline but not adrenaline in control animals and in dogs with diabetes insipidus. Noradrenaline and adrenaline responses after acetylcholine were not different in the two groups of animals. 4 Acetylcholine induced a significant increase in vasopressin plasma levels only in control animals while in dogs with diabetes insipidus vasopressin remained at nearly undetectable levels. 5 Acetylcholine significantly increased atrial natiuretic factor plasma levels only in control dogs. 6 Although plasma renin activity increased in both groups of animals after the i.c. injection of acetylcholine, this change was not significant in any group. 7 These results suggest that, in the anaesthetized dog, the central injection of acetylcholine induces a rise in blood pressure through both an increase in sympathetic outflow and a release of vasopressin.