CSF transferrins characterized by the transferrin/albumin index

Area of Science:

• Biochemistry
• Neuroscience
• Clinical Chemistry

Background:

• The blood-cerebrospinal fluid (CSF) barrier is crucial for maintaining central nervous system homeostasis.
• Assessing the integrity of this barrier is vital for diagnosing neurological conditions.
• Albumin and transferrin are commonly used biomarkers for evaluating barrier function.

Purpose of the Study:

• To establish the transferrin/albumin index as a quantitative measure of blood-CSF barrier permeability.
• To correlate transferrin/albumin index values with changes in CSF protein profiles.

Main Methods:

• Agar electrophoresis was used to analyze unconcentrated CSF and diluted serum samples from 192 patients.
• Radial immunodiffusion quantified albumin and transferrin levels in both CSF and serum.
• The transferrin/albumin index was calculated using these protein concentrations.

Main Results:

• The normal transferrin/albumin index in healthy individuals was determined to be 1.68 (n=77, S.D.=0.22).
• A decreased index (approaching 1) correlated with increased blood-CSF barrier permeability.
• An elevated transferrin/albumin index (>2.34) was associated with an increased tau-globulin fraction on agar electrophoresis.

Conclusions:

• The transferrin/albumin index serves as a reliable indicator of blood-CSF barrier status.
• Changes in the transferrin/albumin index can reflect specific pathological conditions affecting the central nervous system.
• This index offers a valuable tool for clinical assessment of neurological disorders.