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Angiotensins stimulate catecholamine release from the chromaffin tissue of the rainbow trout.
- Source :
-
The American journal of physiology [Am J Physiol] 1997 Jul; Vol. 273 (1 Pt 2), pp. R49-57. - Publication Year :
- 1997
-
Abstract
- Immunohistochemical and pharmacological techniques were utilized to investigate the relationships between angiotensins and catecholamine release from the chromaffin tissue of rainbow trout (Oncorhynchus mykiss). Double labeling with [Asp1, Ile5]angiotensin II-fluorescein isothiocyanate (ANG II-FITC) and anti-dopamine beta-hydroxylase revealed specific ANG II binding sites on chromaffin cells. Injection (1 nmol/kg body wt) of either ANG II-FITC, [Asn1, Val5, Asn9]ANG I, [Asp1, Ile5, His9]ANG I, [Asn1, Val5]ANG II, [Asp1, Val5]ANG II, or [Asp1, Ile5]ANG II elicited catecholamine release from in situ perfusion preparations of the head kidney. Catecholamine release elicited by [Asn1, Val5]ANG II (10(-13) to 10(-7) mol/kg body wt) was dose dependent, and the secretion of epinephrine (Epi) was greater than that of norepinephrine (NE). Relative to the results obtained with the [Asn1, Val5]ANG II treatment (1 nmol/kg body wt), Epi release was 72 and 82% lower in response to injections (1 nmol/kg body wt) of [Asn1, Val5]ANG I [amino acid (AA) positions 1-7] and [Asn1, Val5]ANG I (AA 1-6), respectively. Pretreatment with either losartan (10(-5) M), PD-123319 (10(-5) M), or hexamethonium (10(-3) M) had no effect on [Asn1, Val5]ANG II-elicited catecholamine release. Pretreatment with captopril (10(-4) M) significantly reduced [Asn1, Val5, Asn9]ANG I-elicited Epi and NE release and decreased basal catecholamine release. These results provide direct evidence that angiotensins can elicit catecholamine release from the chromaffin tissue via specific ANG II binding sites and indicate that the synthesis of ANG II may be either local or systemic.
- Subjects :
- Angiotensin I analogs & derivatives
Angiotensin I pharmacology
Animals
Chromaffin System blood supply
Chromaffin System drug effects
Female
Interrenal Gland blood supply
Interrenal Gland drug effects
Male
Oncorhynchus mykiss
Receptors, Angiotensin analysis
Angiotensin II analogs & derivatives
Angiotensin II pharmacology
Chromaffin System physiology
Epinephrine metabolism
Interrenal Gland physiology
Norepinephrine metabolism
Receptors, Angiotensin physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0002-9513
- Volume :
- 273
- Issue :
- 1 Pt 2
- Database :
- MEDLINE
- Journal :
- The American journal of physiology
- Publication Type :
- Academic Journal
- Accession number :
- 9249532
- Full Text :
- https://doi.org/10.1152/ajpregu.1997.273.1.R49