Endocrine regulation of subcutaneous fat metabolism during cold exposure in humans.

Abstract:

:Increased oxidation of carbohydrates and free fatty acids is a well-known phenomenon during cold stress. Nevertheless, sources of the fuels used have not been fully clarified as yet. Thus, the aim of our study was to evaluate the effect of acute cold exposure on lipid and carbohydrate metabolism in human subcutaneous adipose tissue and to identify the possible regulatory mechanisms involved. Ten volunteers were exposed for 30 min to an ambient temperature of 4 degrees C. Interstitial metabolism was assessed with the aid of the microdialysis technique. Lipolysis intensity was evaluated from changes of glycerol concentration in plasma and in dialysate. Cold exposure induced a significant increase of glycerol concentration both in plasma (by 199 +/- 16%, p < 0.01) and in dialysate (by 308 +/- 58%, p < 0.001). No changes in glucose concentration were found whether in plasma or in the dialysate. Ethanol concentration in dialysate increased (148 +/- 15%, p < 0.01), indicating a slower blood flow in the subcutaneous region. Plasma concentrations of various gluco- and/or lipid-regulatory hormones remained unaffected by the cold exposure, except for norepinephrine, which rose about threefold (309 +/- 41%, p < 0.001). The data indicate an important role for subcutaneous adipose tissue in mobilization of free fatty acids during cold exposure. This process seems to be regulated by the sympathetic nervous system, whereas hormones involved in the regulation of lipid metabolism, such as epinephrine, insulin, cortisol, and growth hormone, may play a less significant role-at least under the conditions studied.

journal_name

Ann N Y Acad Sci

authors

Koska J,Ksinantova L,Seböková E,Kvetnansky R,Klimes I,Chrousos G,Pacak K

doi

10.1111/j.1749-6632.2002.tb04308.x

subject

Has Abstract

pub_date

2002-06-01 00:00:00

pages

500-5

eissn

0077-8923

issn

1749-6632

journal_volume

967

pub_type

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