Tamm-Horsfall glycoprotein in human amniotic fluid

Area of Science:

• Biochemistry
• Immunology
• Obstetrics

Background:

• Tamm-Horsfall glycoprotein (THG) is a major urinary protein.
• Its presence and role in amniotic fluid are not fully understood.
• Assessing fetal renal function is crucial for prenatal care.

Purpose of the Study:

• To quantify Tamm-Horsfall glycoprotein in human amniotic fluid.
• To investigate the changes in THG concentration during pregnancy.
• To evaluate THG as a potential biomarker for fetal renal development.

Main Methods:

• Radioimmunoassay (RIA) was used to measure THG.
• Double immunodiffusion and crossed immunoelectrophoresis confirmed THG identity.
• Amniotic fluid samples were collected from pregnancies between 16-25 weeks and near term.

Main Results:

• The cross-reacting material in amniotic fluid was identified as urinary THG.
• THG concentrations increased significantly from 16-25 weeks gestation (0.9 to 4.9 mg/L).
• Concentrations were markedly higher near term (up to 33 mg/L).

Conclusions:

• Urinary Tamm-Horsfall glycoprotein is present in human amniotic fluid.
• Amniotic fluid THG levels show a dynamic increase throughout gestation.
• Measurements of amniotic fluid THG may serve as a valuable indicator of fetal renal function development.