Context-dependent regulation of pectoralis myostatin and lipid transporters by temperature and photoperiod in dark-eyed juncos

Current Zoology
Yufeng ZhangDavid L Swanson

Abstract

A prominent example of seasonal phenotypic flexibility is the winter increase in thermogenic capacity (=summit metabolism, [Formula: see text]) in small birds, which is often accompanied by increases in pectoralis muscle mass and lipid catabolic capacity. Temperature or photoperiod may be drivers of the winter phenotype, but their relative impacts on muscle remodeling or lipid transport pathways are little known. We examined photoperiod and temperature effects on pectoralis muscle expression of myostatin, a muscle growth inhibitor, and its tolloid-like protein activators (TLL-1 and TLL-2), and sarcolemmal and intracellular lipid transporters in dark-eyed juncosJunco hyemalis. We acclimated winter juncos to four temperature (3 °C or 24 °C) and photoperiod [short-day (SD) = 8L:16D; long-day (LD) = 16L:8D] treatments. We found thatmyostatin,TLL-1,TLL-2, and lipid transporter mRNA expression and myostatin protein expression did not differ among treatments, but treatments interacted to influence lipid transporter protein expression. Fatty acid translocase (FAT/CD36) levels were higher for cold SD than for other treatments. Membrane-bound fatty acid binding protein (FABPpm) levels, however, were higher for the cold LD treatment than ...Continue Reading

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Citations

Dec 12, 2019·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·François VézinaAna Gabriela Jimenez
May 12, 2019·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·David L SwansonYufeng Zhang

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Methods Mentioned

BETA
reverse transcription PCR
PCR
protein
electrophoresis

Software Mentioned

StepOnePlus Real System
SigmaStat
Quantity One

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