The effect of beta-sympathomimetic stimulation on parotid salivation in the red kangaroo (Macropus rufus).

Archives of Oral Biology
A M Beal

Abstract

Salivation was stimulated by intracarotid isoprenaline infusion given alone or combined with acetylcholine. By itself, isoprenaline (0.12-1.2 nmol kg-1 min-1) stimulated flow rates of 0.037-0.233 ml min-1 (2.77-10.5 microliters/g gland per min). Salivary Na, Cl, PO4 and total solute concentrations were positively correlated with flow; K, Mg and urea were negatively correlated with flow; and Ca, H+, HCO3, protein and amylase activity were not correlated with flow. Relative to cholinergic saliva, isoprenaline-evoked saliva had higher levels of amylase activity, urea, protein, K, Mg, H+, PO4 and Cl but lower osmolality, Na, Ca and HCO3. At a steady flow (1 ml min-1), isoprenaline infusion (0.3 nmol kg-1 min-1) superimposed on a pre-existing acetylcholine infusion increased salivary amylase activity, protein, urea, K, Mg, Cl and PO4, reduced HCO3 and did not alter Na, Ca, H+ and osmolality. Superimposition of isoprenaline infusion (0.5 nmol kg-1 min-1) on a low-level acetylcholine infusion increased flow rate by 400-900%. Excretion rates of K, Mg, Cl and PO4 were higher and Ca lower than predicted for saliva secreted at equivalent flows during acetylcholine stimulation. Na, H+ and HCO3 were as predicted for the same flow rate under...Continue Reading

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Citations

Apr 1, 1995·Pflügers Archiv : European journal of physiology·P PoronnikD I Cook
Jan 1, 1995·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·A M Beal
Jan 1, 2003·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·A M Beal
Oct 17, 1998·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·N A Scott, A M Beal
May 29, 2000·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·A M Beal
Jun 26, 2009·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Michael Gröschl
Jan 1, 1989·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·A M Beal
Jan 1, 1991·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·A M Beal

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