Hock immunization, a refined alternative for developing experimental autoimmune myasthenia gravis (EAMG) in mice

Area of Science:

• Neuroscience
• Immunology
• Animal Models

Background:

• Experimental autoimmune myasthenia gravis (EAMG) is a crucial mouse model for studying neuromuscular junction disorders.
• Traditional EAMG induction involves footpad injections, which can cause significant discomfort and mobility issues in mice.

Purpose of the Study:

• To evaluate hock immunization as a less invasive alternative for EAMG induction in mice.
• To compare the efficacy and animal welfare of hock versus footpad immunization in the EAMG model.

Main Methods:

• Female C57BL6/6J mice were immunized with purified torpedo acetylcholine receptor (tAChR) either in the hocks or footpads, alongside scapular injections.
• Disease progression was assessed via inverted mesh measurements, body weight, tAChR antibody levels, and electrophysiological responses to curare.

Main Results:

• Both hock and footpad immunization induced comparable muscle weakness and tAChR antibody production.
• Hock immunization led to less significant body weight reduction and maintained better mechanical sensitivity over time.
• Electrophysiological studies confirmed disease severity was similar between groups.

Conclusions:

• Hock immunization is a viable and refined alternative for EAMG induction, offering comparable disease modeling with improved animal welfare.
• This method minimizes immunization-related discomfort without compromising EAMG model efficacy.