Regulation of glycolysis in the pectoralis muscles of seasonally acclimatized American goldfinches e

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Regulation of glycolysis in the pectoralis
muscles of seasonally acclimatized American
goldfinches exposed to cold

• - Richard L. Marsh et al.

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BACKGROUND

• Acclimatization
• Survival
• Pectoral Power

http//www.heatly.com/MainSiteAssets/Goldfinch.jpg
(note the tell-tale striation of the American
Goldfinch)
http//lib.store.yahoo.net/lib/musclesurf/ab-man1.
jpg
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HYPOTHESES

• 1) The low use of glucose and glycogen during
  cold stress by winter goldfinches is related to
  inhibition of glycolysis in the pectoralis
  muscles at the level of phosphofructokinase
  (PFK).
• 2) Citrate serves as a key negative modulator of
  PFK.
• 3) Glycogen depletion in the pectoralis muscles
  leads to fatigue and consequent hypothermia.

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PROCEDURE

• Trapping
• Containment
• Exposure

http//www.jjcardinal.com/nyjer.jpg
http//www.portraitoftheearth.com/lpbo/P1030881.JP
G
http//www.iowastormwater.org/images/Water20Rippl
ing.jpg
http//www.schmoker.org/BirdPics/Photos/Finches/AM
GO9.jpg
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ANALYSIS

• Comparisons

FIG. 1 - Glycogen concentrations in pectoralis
muscles of acclimatized goldfinches exposed to
different thermal regimes in summer or winter.
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DISCUSSION
FIG. 2 - Pyruvate concentrations in pectoralis
muscles of acclimatized goldfinches exposed to
different thermal regimes in summer or winter.
FIG. 3 - Citrate concentrations in pectoralis
muscles of acclimatized goldfinches exposed to
different thermal regimes in summer or winter.
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CONCLUSIONS

• Carbohydrates arent limiting
• Depletion ? hypothermia
• Sparing is important, but why?

http//home.earthlink.net/barbolink1/BrdLnks/gold
finch07md.jpg
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QUESTIONS?