Agents Which Inhibit NF-κB Signaling Block Spontaneous Contractile Activity and Negatively Influence Survival of...

Area of Science:

• Cellular Biology
• Molecular Biology
• Muscle Physiology

Background:

• Duchenne muscular dystrophy (DMD) involves chronic NF-κB signaling.
• The role of NF-κB in myotube development is unclear.
• p65 is a key component of the NF-κB complex.

Purpose of the Study:

• To investigate p65 expression in healthy and mdx mouse myotubes.
• To determine if NF-κB pathway inhibitors affect myotube development.

Main Methods:

• Confocal immunofluorescence to assess p65 expression.
• Primary myotube cultures from mdx and nondystrophic mice.
• Treatment with NF-κB inhibitors (PDTC, sulfasalazine, m-p65tb-vivomorph1) and a control morpholino.

Main Results:

• Nondystrophic and mdx myotubes showed similar p65 levels and TNF-α responses.
• NF-κB inhibitors reduced myotube contractile activity and viability.
• A specific morpholino targeting m-p65 abolished contractile activity and reduced viability.

Conclusions:

• NF-κB signaling plays a direct role in myotube development.
• NF-κB inhibitors may pose therapeutic limitations for DMD and related dystrophies.