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A Non-Nuclear NF-κB Modulates Alcohol Sensitivity But Not Immunity
Thilini P Wijesekera1, Zheng Wu1, Nicole P Stephens1
1Department of Neuroscience and The Waggoner Center for Alcohol and Addiction Research, The University of Texas at Austin, Austin, Texas 78712.
Summary
The NF-κB protein Dif has distinct roles in fruit flies: DifA fights infection via the nucleus, while DifB affects alcohol sensitivity non-genomically at synapses.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Nuclear Factor kappa-light-chain-enhancer of activated B cells (NF-κB) proteins are crucial transcription factors in immune responses and behavior.
- In mammals, NF-κB proteins in neurons are found at synapses but are thought to act exclusively in the nucleus.
- The Drosophila Dif gene encodes NF-κB proteins involved in both immunity and behavior.
Purpose of the Study:
- To investigate the distinct roles of NF-κB protein isoforms within the nucleus and outside the nucleus in Drosophila.
- To determine if different Dif protein isoforms mediate immune function versus behavioral responses, such as alcohol sensitivity.
Main Methods:
- Utilized Drosophila melanogaster as a model organism.
- Differentiated between two Dif protein isoforms: DifA (nuclear) and DifB (non-nuclear).
- Conducted genetic mutation studies (DifA and DifB mutants) to assess immune response and alcohol behavioral sensitivity.
- Employed immunohistochemical and biochemical assays to localize DifB within the central nervous system and at synapses.
Main Results:
- The DifA isoform acts as a canonical nuclear NF-κB, essential for combating infection.
- The DifB variant is localized in the central nervous system, particularly in synapse-rich regions like mushroom bodies and antennal lobes.
- DifB does not enter the nucleus and co-localizes with synaptic proteins.
- DifB mutants exhibit altered alcohol behavioral sensitivity, while DifA mutants show compromised immune responses.
- DifA mutants do not affect alcohol sensitivity.
Conclusions:
- The Drosophila Dif gene segregates nuclear (DifA) and non-nuclear (DifB) NF-κB actions into distinct protein isoforms.
- The non-nuclear DifB isoform mediates alcohol behavioral sensitivity through a non-genomic mechanism, diverging from the transcriptional role of NF-κB in immunity.
- DifB's localization suggests a novel, rapid, non-genomic synaptic mechanism for NF-κB signaling in modulating behavior.
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