Role of PDC-109 As A Specific Seminal Plasma Protein in Regulating Bull Fertility

¹ Department of Animal Science, Faculty of Science and Technology, Universitas Islam Negeri Alauddin, Makassar 92113, Indonesia
² Department of Animal Production, Faculty of Animal Science, Universitas Hasanuddin, Makassar 90245, Indonesia
³ Department of Agroecotechnology, Faculty of Agriculture, Universitas Islam Al-Azhar Mataram, Indonesia

^* Corresponding author: rasyidah.mappanganro@uin-alauddin.ac.id

Abstract

PDC-109, also known as Binder of Sperm Protein 1 (BSP1), is the primary protein found in bovine seminal plasma and is critical in bull fertility. It is essential for sperm capacitation, motility, and interaction with the egg. After ejaculation, this protein binds to the plasma membrane of sperm, altering its lipid composition and increasing membrane fluidity—an important step for successful fertilization. Additionally, it aids in sperm adhesion to the oviductal epithelium, helping form a sperm reservoir and extending sperm viability. Recent studies suggest that PDC-109 may also influence immune responses in the female reproductive tract, potentially enhancing fertilization and development of early embryonic. However, prolonged exposure to this protein, especially during cryopreservation, has been linked to sperm membrane destabilization due to cholesterol efflux. This dual role—enhancing fertility while potentially compromising membrane integrity—emphasizes the need for further research. PDC-109 has also been proposed as a biomarker for male fertility assessment, as its constituent in seminal plasma have correlated with fertility variations in bulls. Despite these insights, the precise mechanisms by which PDC-109 interacts with sperm membranes and reproductive tissues remain unclear. Future research should focus on unraveling these pathways, which could lead to improved fertility management strategies in cattle breeding and the refinement of cryopreservation techniques. In conclusion, PDC-109 is a key component of bovine reproductive physiology, significantly influencing sperm function and fertilization. Further exploration of its biochemical pathways and potential applications could enhance reproductive efficiency in bulls.