Composition and functioin of human cervical mucus

Area of Science:

• Biochemistry
• Reproductive Biology
• Biophysics

Background:

• Human cervical mucus plays a crucial role in reproduction.
• Its physical properties, like viscoelasticity, are vital for sperm transport and protection.
• Understanding the factors influencing mucus viscoelasticity is essential for reproductive health research.

Purpose of the Study:

• To investigate the biochemical composition of human cervical mucus.
• To determine the relationship between mucus composition and its viscoelastic properties.
• To assess the influence of the menstrual cycle phase on cervical mucus characteristics.

Main Methods:

• Collection of cervical mucus from seven donors across different menstrual cycle phases.
• Solubilization and fractionation of mucus using Sepharose chromatography.
• Purification of mucin fractions and analysis of amino acid and carbohydrate composition.
• Quantification of viscoelasticity using microrheometry and statistical analysis.

Main Results:

• Mucin fractions were highly purified, with consistent amino acid composition across donors and cycle phases.
• Carbohydrate composition was similar, except for the sialic acid-to-fucose ratio, which varied significantly between donors.
• Viscoelasticity depended on the donor, nondialyzable solids, and mucin content, but not the menstrual cycle phase.
• Mucin concentration, not composition, appears to change with hormonal milieu alterations.

Conclusions:

• Cervical mucus viscoelasticity is primarily determined by individual donor characteristics and mucus concentration, not the menstrual cycle phase.
• The relationship between mucus function (viscoelasticity) and its carbohydrate composition/structure is unique to each donor.
• Hormonal influences during the menstrual cycle primarily affect mucin concentration rather than its intrinsic composition.