Active and acid-activatable TGF-beta in human sera, platelets and plasma

Area of Science:

• Biochemistry
• Immunology
• Molecular Biology

Background:

• Transforming growth factor beta (TGF-beta) plays a critical role in human diseases.
• Accurate measurement of active and latent TGF-beta forms in serum and plasma is essential for research.
• Existing assays may not adequately differentiate or quantify these TGF-beta forms.

Purpose of the Study:

• To develop and validate novel enzyme-linked immunosorbent assays (ELISA) for quantifying active and latent TGF-beta.
• To assess the reliability of these TGF-beta assays in human serum and plasma samples.
• To investigate the relationship between serum and plasma TGF-beta concentrations.

Main Methods:

• Developed two distinct ELISAs using specific antibodies and TGF-beta type II receptor.
• Assayed active plus acid-activatable, latent TGF-beta ((a+l)TGF-beta) in the range of 4–2000 pmol/l.
• Assayed active TGF-beta alone in the range of 20–4000 pmol/l in serum and plasma.

Main Results:

• Both ELISAs demonstrated high sensitivity for TGF-beta 1 and TGF-beta 3, with lower sensitivity to TGF-beta 2.
• Mean (a+l)TGF-beta in serum was 330 pmol/l, with a wide range; mean active TGF-beta was 230 pmol/l.
• Serum and platelet-poor plasma showed similar TGF-beta concentrations, indicating assay reliability and minimal platelet influence.

Conclusions:

• The developed ELISAs provide reliable and distinct measurements of active and latent TGF-beta in human serum and plasma.
• These assays enable accurate investigation of TGF-beta's biological roles in various disease states.
• Serum TGF-beta measurements accurately reflect plasma concentrations, offering a practical approach for clinical studies.