Postpartum Uterine Involution in Cows: Quantitative Assessment of Structural Remodeling and Immune Cell Infiltration

Area of Science:

• Veterinary Medicine
• Reproductive Biology
• Immunology

Background:

• Postpartum uterine involution is crucial for cattle fertility.
• It involves complex morphological and immunological changes.
• Understanding these dynamics is key for reproductive health.

Purpose of the Study:

• To characterize tissue remodeling during postpartum uterine involution in cattle.
• To analyze immune cell dynamics throughout the involution process.
• To correlate immunomorphological events with uterine recovery.

Main Methods:

• Endometrial biopsies were collected at four postpartum time points.
• Histological analysis assessed tissue architecture and epithelial integrity.
• Immune cell populations (PMNs, macrophages, NK cells, T and B lymphocytes) were quantified.

Main Results:

• Stable epithelial and stromal architecture observed.
• Stromal edema fluctuated, while endometrial gland numbers increased by Day 35.
• A shift from neutrophil-dominated inflammation to lymphocyte-rich infiltrates occurred, peaking at Day 21.

Conclusions:

• Uterine involution involves dynamic immunomorphological changes.
• Immune cell modulation supports uterine recovery and may aid in early endometritis diagnosis.
• Findings offer insights for improved reproductive management in dairy cattle.