Resolving Transferrin Isoforms via Agarose Gel Electrophoresis

Area of Science:

• Clinical Chemistry
• Biochemistry
• Neurology

Background:

• Cerebrospinal fluid (CSF) leaks, presenting as rhinorrhea or otorrhea, pose risks of serious complications.
• Early and accurate detection of CSF leaks is crucial for patient management.
• β₂-transferrin is a specific biomarker for CSF, making its detection vital.

Purpose of the Study:

• To compare the effectiveness of morpholinopropanesulfonic acid (MOPS)-histidine buffer with the standard barbital buffer for detecting β₂-transferrin in CSF leak diagnosis.
• To evaluate the resolution of transferrin isoforms using different buffer systems in agarose electrophoresis.

Main Methods:

• Agarose electrophoresis was performed on 20 patient specimens (aural or nasal) suspected of CSF leaks.
• Specimens were analyzed using both barbital buffer and MOPS-histidine buffer systems.
• The number of transferrin bands detected by each buffer was recorded.

Main Results:

• The MOPS-histidine buffer identified 5 transferrin bands, while the barbital buffer identified only 2.
• Results were concordant for 17 out of 20 specimens.
• Three specimens initially negative with barbital buffer tested positive with MOPS-histidine buffer, with two later confirmed positive by barbital buffer using new samples.

Conclusions:

• Agarose electrophoresis utilizing the MOPS-histidine buffer enhances the resolution of transferrin isoforms.
• The MOPS-histidine buffer demonstrates superior sensitivity in detecting β₂-transferrin for diagnosing CSF leaks compared to the barbital buffer.