Peptidergic neurohormonal control systems in invertebrates

Area of Science:

• Neuroscience
• Molecular Biology
• Behavioral Biology

Background:

• Neuropeptides are crucial for neurohormonal control of behaviors and physiological functions in invertebrates.
• The multiplicity of neuropeptides raises questions about their distinct or redundant roles.
• Closely related neuropeptides can exhibit distinct actions or functional redundancy in systems like molluscs and insects.

Purpose of the Study:

• To investigate the functional consequences of neuropeptide multiplicity in invertebrate model systems.
• To explore how alternative gene splicing and cell-specific processing generate functionally distinct neuropeptides.
• To understand the role of neuropeptides in modulating rhythm-generating neural circuits.

Main Methods:

• Analysis of neuropeptide expression through alternative gene splicing.
• Investigation of cell-specific post-translational processing of neuropeptides.
• Examination of neuropeptide 'cocktail' release mechanisms.
• Study of neuropeptide modulation of neural networks in molluscs, crustaceans, and insects.

Main Results:

• Identified systems where multiple neuropeptide isoforms may be functionally redundant.
• Demonstrated that distinct neuropeptides can be generated from the same gene via alternative splicing or differential processing.
• Showcased targeted release of neuropeptide 'cocktails' acting on specific neuronal or muscular targets.
• Highlighted the prominent role of neuropeptides in modulating rhythm-generating circuits, including mollusc networks, the crab stomatogastric ganglion, and fly circadian pacemakers.

Conclusions:

• Neuropeptide multiplicity contributes to the precise control of invertebrate behaviors and physiology.
• Alternative gene expression and processing strategies allow for functional diversification and specificity of neuropeptides.
• Neuropeptides play a significant role in regulating endogenous rhythms and neural circuit activity.