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First published online June 6, 2005
Journal of Experimental Biology 208, 2217-2225 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01621

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Beta-adrenergic control of plasma glucose and free fatty acid levels in the air-breathing African catfish Clarias gariepinus Burchell 1822

Johannes C. F. van Heeswijk^1,*, Gerjanne J. Vianen¹, Guido E. E. J. M. van den Thillart¹ and Johan Zaagsma²

¹ Institute of Biology Leiden, Leiden University, PO Box 9516, 2300 RA, Leiden, the Netherlands
² Department of Molecular Pharmacology, University Centre for Pharmacy, University of Groningen, 9713 AV, Groningen, the Netherlands

View larger version (15K): [in a new window]   Fig. 1. The relative hematocrit of African catfish infused with saline (filled circles; N=7), isoprenaline (open circles; N=6; 27 µg kg–1) or noradrenaline (triangles; N=5–6; 154 µg kg–1) from t=0 to 1.5 h. *P<0.05 vs isoprenaline infusion.

View larger version (17K): [in a new window]   Fig. 2. The relative plasma glucose concentration of African catfish infused with saline (filled circles; N=7), isoprenaline (open circles; N=6; 27 µg kg–1) or noradrenaline (triangles; N=5–6; 154 µg kg–1) from t=0 to 1.5 h. *P<0.05 vs initial values; P<0.05 vs saline infusion; P<0.05 vs isoprenaline infusion; P<0.05 vs initial values and saline infusion.

View larger version (19K): [in a new window]   Fig. 3. The relative plasma glucose concentration of African catfish infused with saline (filled circles; N=7) or isoprenaline (open circles; N=6; 27 µg kg–1) in combination with either atenolol (filled squares; N=5; 213 µg kg–1) or ICI 118,551 (filled triangles; N=6; 250 µg kg–1) from t=0 to 1.5 h. *P<0.05 vs initial values; P<0.05 vs saline infusion; P<0.05 vs initial values and saline infusion; P<0.05 vs initial values, saline and isoprenaline infusion.

View larger version (16K): [in a new window]   Fig. 4. The relative plasma FFA concentration of African catfish infused with saline (filled circles; N=7), isoprenaline (open circles; N=6; 27 µg kg–1) or noradrenaline (triangles; N=5–6; 154 µg kg–1) from t=0 to 1.5 h. *P<0.05 vs initial values; P<0.05 vs saline infusion; P<0.05 vs initial values and saline infusion.

View larger version (15K): [in a new window]   Fig. 5. The relative plasma FFA concentration of African catfish infused with isoprenaline (open circles; N=6; 27 µg kg–1) in combination with either atenolol (squares; N=5; 213 µg kg–1) or ICI 118,551 (triangles; N=6; 250 µg kg–1) from t=0 to 1.5 h. Note that all values are corrected for the saline infusion. *P<0.05 vs initial values; P<0.05 vs isoprenaline infusion; P<0.05 vs initial values and saline infusion; P<0.05 vs initial values and isoprenaline infusion.