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Flight effects on plasma levels of lipid, glucagon and thyroid hormones in homing pigeons.
Horm Metab Res. 1989 Oct; 21(10):542-5.HM

Abstract

Significant increases in the concentration of plasma glucagon-like immunoreactivity (GLI) and plasma levels of free fatty acids (FFA) and triglycerides (TG) concomitant with decreases in circulating levels of thyroxine (T4) and triiodothyronine (T3) and T3/T4 ratio were observed in homing pigeons, untrained for 3 months, after a flight of 48 km lasting 90-160 min. The increased level of FFA is attributed to glucagon stimulated lipolysis. The elevation of TG levels may be due to altered partitioning and utilization of lipoprotein in adipose tissue and muscle. Reductions in plasma T4, T3 and T3/T4 ratio are probably due to inhibition of T4 secretion and 5'-monodeiodination with possible conversion of T4 to reverse T3 (rT3). These processes may represent a mechanism for regulation of thyroid hormone metabolism during strenuous and extended flight.

Authors+Show Affiliations

George JC
Department of Zoology, University of Guelph, Ontario, Canada.
John TM
No affiliation info available
Mitchell MA
No affiliation info available

MeSH

AnimalsColumbidaeFatty Acids, NonesterifiedFlight, AnimalGlucagonLipidsThyroid HormonesThyroxineTriglyceridesTriiodothyronine

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

2807143

Citation

George, J C., et al. "Flight Effects On Plasma Levels of Lipid, Glucagon and Thyroid Hormones in Homing Pigeons." Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme, vol. 21, no. 10, 1989, pp. 542-5.
George JC, John TM, Mitchell MA. Flight effects on plasma levels of lipid, glucagon and thyroid hormones in homing pigeons. Horm Metab Res. 1989;21(10):542-5.
George, J. C., John, T. M., & Mitchell, M. A. (1989). Flight effects on plasma levels of lipid, glucagon and thyroid hormones in homing pigeons. Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme, 21(10), 542-5.
George JC, John TM, Mitchell MA. Flight Effects On Plasma Levels of Lipid, Glucagon and Thyroid Hormones in Homing Pigeons. Horm Metab Res. 1989;21(10):542-5. PubMed PMID: 2807143.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Flight effects on plasma levels of lipid, glucagon and thyroid hormones in homing pigeons. AU - George,J C, AU - John,T M, AU - Mitchell,M A, PY - 1989/10/1/pubmed PY - 1989/10/1/medline PY - 1989/10/1/entrez SP - 542 EP - 5 JF - Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme JO - Horm Metab Res VL - 21 IS - 10 N2 - Significant increases in the concentration of plasma glucagon-like immunoreactivity (GLI) and plasma levels of free fatty acids (FFA) and triglycerides (TG) concomitant with decreases in circulating levels of thyroxine (T4) and triiodothyronine (T3) and T3/T4 ratio were observed in homing pigeons, untrained for 3 months, after a flight of 48 km lasting 90-160 min. The increased level of FFA is attributed to glucagon stimulated lipolysis. The elevation of TG levels may be due to altered partitioning and utilization of lipoprotein in adipose tissue and muscle. Reductions in plasma T4, T3 and T3/T4 ratio are probably due to inhibition of T4 secretion and 5'-monodeiodination with possible conversion of T4 to reverse T3 (rT3). These processes may represent a mechanism for regulation of thyroid hormone metabolism during strenuous and extended flight. SN - 0018-5043 UR - https://www.unboundmedicine.com/medline/citation/2807143/Flight_effects_on_plasma_levels_of_lipid_glucagon_and_thyroid_hormones_in_homing_pigeons_ DB - PRIME DP - Unbound Medicine ER -