An antisense-long-noncoding-RNA modulates p75^NTR expression levels during neuronal polarization

Area of Science:

• Neuroscience
• Molecular Biology
• Developmental Biology

Background:

• Neuronal polarization is crucial for neural network formation and brain development.
• The p75 neurotrophin receptor (p75^NTR) is essential for axonal specification during neuronal differentiation.
• The molecular mechanisms regulating p75^NTR levels during axonal specification are largely unknown.

Purpose of the Study:

• To identify novel regulators of p75^NTR expression during neuronal polarization.
• To investigate the function of a newly identified natural antisense transcript, AS-p75, in regulating p75^NTR.

Main Methods:

• Utilized an *in vitro* model of polarizing murine neurons.
• Analyzed the expression profiles of AS-p75 and p75^NTR.
• Performed AS-p75 competition and depletion experiments.
• Assessed p75^NTR subcellular distribution and neuronal polarization.

Main Results:

• Identified AS-p75, a natural antisense transcript within the p75NGFR gene.
• AS-p75 and p75^NTR exhibit divergent expression patterns during neuronal polarization.
• Depletion or competition of AS-p75 leads to increased p75^NTR expression.
• AS-p75 depletion alters p75^NTR localization and impairs neuronal polarization.

Conclusions:

• AS-p75 acts as a negative regulator of p75^NTR expression.
• AS-p75 modulates p75^NTR subcellular distribution and influences neuronal polarization.
• Uncovered a novel regulatory mechanism for p75^NTR during *in vitro* neuronal polarization, offering insights into brain development.