General and comparative endocrinology

Methionine-enkephalin may raise blood sugar levels in the prawns Penaeus indicus and Metapenaeus monocerus

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Updated

Abstract

Injection of methionine-enkephalin into intact prawns induced significant hyperglycemia in a dose-dependent manner.

  • Total carbohydrate and glycogen levels in prawns decreased after methionine-enkephalin injection.
  • An increase in phosphorylase activity was observed in intact prawns, suggesting glycogen breakdown contributed to hyperglycemia.
  • Methionine-enkephalin injection did not affect hemolymph glucose levels, tissue carbohydrates, glycogen, or phosphorylase activity in eyestalk-ablated crabs.
  • Findings support the hypothesis that methionine-enkephalin may function as a neurotransmitter in crustaceans, stimulating the release of hyperglycemic hormones.

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