Control of Central and Peripheral Targets by a Multifunctional Peptidergic Interneuron

Area of Science:

• Neuroscience
• Animal Physiology
• Behavioral Biology

Background:

• Feeding activity and cardiovascular function are linked in the terrestrial slug Limax maximus.
• Dehydration suppresses feeding responsiveness and heart activity in intact slugs.
• Peptidergic buccal ganglion neurons RB1 and LB1 significantly influence the feeding motor program (FMP) and heart contraction force.

Purpose of the Study:

• To investigate the role of buccal ganglion neurons in modulating feeding and cardiovascular functions.
• To determine if interneuron B1 mediates coincident modulation of multiple responses to physiological stresses.

Main Methods:

• Intracellular stimulation of B1 neurons in Limax maximus.
• Observation of frequency-dependent excitation of the feeding motor program (FMP) and heart activity.

Main Results:

• Intracellular stimulation of B1 neurons demonstrated frequency-dependent excitation of both the FMP and the heart.
• The B1 neurons appear to contain small cardioactive peptides (SCPs).

Conclusions:

• Interneuron B1 plays a crucial role in the coordinated modulation of feeding and cardiovascular functions.
• B1 neurons, likely containing SCPs, may serve as a central integrator for responses to physiological stresses in Limax maximus.