Biophysical Characterization and Preformulation Studies of Human Mesencephalic Astrocyte-Derived Neurotropic Factor

Area of Science:

• Biochemistry
• Protein Stability
• Neuroscience

Background:

• Human mesencephalic astrocyte-derived neurotrophic factor (hMANF) is a novel neurotrophic factor with therapeutic potential.
• Limited data exists regarding the preformulation stability of hMANF.

Purpose of the Study:

• To evaluate the chemical and physical stability of hMANF.
• To determine the impact of pH, temperature, buffers, and excipients on hMANF stability.

Main Methods:

• Preformulation studies were conducted across various pH and temperature conditions.
• Fourier-transform infrared (FTIR) spectroscopy was used to assess protein conformation.
• Stability was evaluated at different hMANF concentrations (1 and 10 mg/mL).

Main Results:

• hMANF stability decreases significantly near pH 4, correlating with loss of native alpha-helical structure.
• The protein exhibits good stability around pH 6, with histidine and phosphate identified as suitable buffers.
• Slight instability was observed above pH 6.5.
• Stability was comparable at 1 and 10 mg/mL concentrations.

Conclusions:

• hMANF is notably stable in aqueous solutions near pH 6.
• Formulation strategies can be developed to ensure adequate long-term stability for hMANF therapeutics.