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Journal of Experimental Biology, Vol 129, Issue 1 265-278, Copyright © 1987 by Company of Biologists

JOURNAL ARTICLES

Single nephron function of the lesser spotted dogfish, Scyliorhinus canicula, and the effects of adrenaline

JA Brown and C Green

Function of the kidney and the nephron in the lesser spotted dogfish, Scyliorhinus canicula, was investigated by clearance, renal tubular micropuncture and ferrocyanide infusion techniques. 70% of the glomerular filtrate was reabsorbed within the renal tubule, producing slightly hypotonic urine. Glomeruli were: perfused and filtering (F); arterially perfused but not filtering (NF); or non-arterially perfused and hence not filtering (NP). Adrenaline reduced the proportion of filtering glomeruli from 94% to 70%. Despite this reduction, a marked overall glomerular diuresis occurred. Single nephron glomerular filtration rates (SNGFRs) ranged from 1.5 to 26 nl min-1 with a mean rate of 9.5 nl min-1 during control periods. Adrenaline elevated SNGFR to a mean value of 22.9 nl min-1 (range 2.4-64.6 nl min-1). Tubular fluid/plasma inulin concentration ratios (TF/Pin) indicated reabsorption of around 74% of the glomerular filtrate by the proximal segments. Comparison of TF/P and urine/plasma inulin concentrations (U/Pin) strongly suggests tubular secretion of water beyond the point of puncture. Adrenaline infusion appears to increase both proximal water reabsorption and distal tubular secretion.


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© The Company of Biologists Ltd 1987