PDGF-AB release during and after haemodialysis procedure

Area of Science:

• Nephrology
• Cardiovascular Research
• Biochemistry

Background:

• Hemodialysis involves blood-membrane contact, triggering platelet alpha-granule release.
• Platelet-derived growth factor (PDGF) is stored in alpha-granules and may contribute to accelerated atherosclerosis.

Purpose of the Study:

• To evaluate intra- and post-dialytic changes in serum PDGF-AB levels.
• To assess these changes during hemodialysis using a cellulosic membrane.

Main Methods:

• Enzyme-linked immunosorbent assay (ELISA) was used to measure PDGF-AB, platelet factor-4 (PF4), and beta-thromboglobulin (beta-TG).
• Levels were determined in 10 patients undergoing five consecutive hemodialysis sessions with a CU membrane.
• Blood samples were collected at multiple time points during and after dialysis, and after heparin administration.

Main Results:

• Serum PDGF-AB levels significantly increased during hemodialysis (+134% at 30 min, +140% at 240 min).
• Elevated PDGF-AB levels persisted throughout the dialysis session and returned to baseline only 20 hours post-session.
• PF4 and beta-TG exhibited similar trends; a heparin bolus caused a minor PDGF-AB increase.

Conclusions:

• PDGF-AB release during hemodialysis is primarily a consequence of blood-membrane interaction.
• Serum PDGF-AB levels decrease slowly after dialysis, indicating prolonged systemic effects.