Cocaine tolerance in honey bees.

Area of Science:

• Neuroscience
• Pharmacology
• Addiction research

Background:

• Invertebrates are increasingly used to study the molecular and cellular effects of drugs of abuse.
• Understanding addiction mechanisms often involves examining long-term adaptive responses to repeated drug use, primarily studied in mammals.

Purpose of the Study:

• To investigate whether invertebrates, using the honey bee model system, exhibit adaptive responses to cocaine.
• To explore the basic mechanisms of addiction in a non-mammalian model.

Main Methods:

• Honey bees were subjected to repeated topical treatment with a low dose of cocaine.
• Physiological tolerance was assessed by measuring resistance to the motor effects of a higher cocaine dose.
• Biogenic amine levels in whole bee brains were measured after acute and repeated cocaine treatments.

Main Results:

• Repeated low-dose cocaine treatment induced physiological tolerance in bees, making them resistant to higher doses.
• Neither acute nor repeated cocaine treatments resulted in measurable changes in whole-brain biogenic amine levels.
• Bees displayed clear short- and long-term behavioral responses to cocaine administration.

Conclusions:

• Honey bees demonstrate adaptive physiological tolerance to cocaine, suggesting conserved mechanisms relevant to addiction research.
• Whole-brain biogenic amine measurements may not capture localized neurochemical effects in small brains like the honey bee's.
• The honey bee serves as a viable model for studying behavioral and physiological responses to drugs of abuse.