Method for co-purification of equine neutrophil elastase and myeloperoxidase from a limited blood volume.

The research article presents a method of isolating both neutrophil myeloperoxidase (MPO) and elastase, two enzymes that play a role in severe inflammatory diseases, from a small volume of horse blood.

Overview of the Research

• The study describes a novel method to co-purify two enzymes, neutrophil myeloperoxidase (MPO) and elastase from a small volume of equine blood. Previously, these enzymes had been purified separately using a large volume of blood.
• These enzymes typically become active during severe inflammatory diseases and can cause tissue injuries. Hence, their isolation may provide key information about processes related to inflammation and tissue damage.

Procedure Used in the Experiment

• First, the researchers isolated a type of white blood cells called Polymorphonuclear neutrophils (PMN) from a blood sample of 460 ml using a centrifuge. This process involves spinning the blood at a high speed to separate its components based on their densities.
• Both MPO and elastase were then extracted by crushing the PMN cells.
• After extracting the enzymes, an ionic exchange chromatography phase was used to separate them. This technique separates proteins based on their charge.
• For further purification to ensure only the desired enzymes were collected, gel filtration chromatography was used on Superdex 200 and 75 respectively. This is a type of size exclusion chromatography that separates molecules based on their size.
• Specific enzymatic assays were used to identify the enzymes in the collected fractions, and electrophoresis, a method to separate molecules by their charge and size, was used to confirm their purity.

Results

• The results indicate that the purification process significantly increased the specific activity of both enzymes. Specific activity is defined as the amount of desired product (enzyme) produced per unit of time.
• The final yields were 340 µg (micrograms) for elastase and 130 µg for MPO, which are regarded as satisfactory for future studies related to their roles in inflammatory diseases.
• The successful isolation of these enzymes from the same blood sample and their respective yields showcases the possibility of studying their interactions and implications during inflammation and tissue damage.