Journal of experimental zoology. Part A, Ecological genetics and physiology

How dopamine causes high blood sugar in the freshwater edible crab Oziothelphusa senex senex

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Abstract

Dopamine injection produced hyperglycemia in intact crabs in a dose-dependent manner.

  • Hyperglycemia was associated with a significant decrease in total carbohydrates and glycogen levels in intact crabs.
  • Dopamine increased glycogen phosphorylase activity in the hepatopancreas and muscle of intact crabs, suggesting dopamine-induced glycogen breakdown.
  • Bilateral eyestalk ablation led to increased total carbohydrates and glycogen levels, along with decreased phosphorylase activity.
  • Eyestalk ablation resulted in lower levels of hyperglycemic hormones in the hemolymph.
  • Dopamine-injected crabs had higher hemolymph hyperglycemic hormone levels compared to control crabs, indicating a stimulating effect of dopamine.

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