Novel LncRNA Gm44763 Regulates Morphine-Induced Reward Memory via MiR-298-5p-Mediated eIF4E Translation Control

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Drug-associated reward memory is crucial for addiction development and relapse.
• The molecular mechanisms underlying this memory, particularly in the medial prefrontal cortex (mPFC), are not fully understood.

Purpose of the Study:

• To identify novel molecular regulators of morphine-induced reward memory in the mPFC.
• To elucidate the functional role of a newly identified long non-coding RNA (lncRNA), Gm44763, in this process.

Main Methods:

• Transcriptomic profiling of the mouse mPFC following morphine exposure.
• Behavioral analyses (e.g., conditioned place preference) to assess reward memory.
• Molecular techniques including RNA immunoprecipitation, Western blotting, Golgi staining, and fiber photometry.
• In vivo manipulation of Gm44763 and miR-298-5p levels.

Main Results:

• Gm44763 was identified as a critical regulator of morphine-induced reward memory in mPFC neurons.
• Gm44763 acts as a molecular sponge for miR-298-5p, upregulating the translation of eukaryotic translation initiation factor 4E (eIF4E).
• Gm44763 modulated synaptic structure and neuronal excitability, and its inhibition reversed morphine-induced effects.
• The Gm44763/miR-298-5p/eIF4E axis was shown to be a key pathway in regulating drug-associated memory.

Conclusions:

• Gm44763 is a novel lncRNA that plays a significant role in morphine-induced reward memory and synaptic plasticity.
• The identified Gm44763/miR-298-5p/eIF4E pathway provides new insights into the molecular mechanisms of drug-associated memory formation.
• This pathway represents a potential therapeutic target for addiction treatment.