Cellulardefense
The bovine udder possesses a complex and efficient immune system geared towards safeguarding against bacterial invaders and maintaining udder health. Serving as the frontline defense, the teat of the udder acts as a physical barrier, preventing microbial entry.
Within the mammary gland, mammary epithelial cells (MECs) play a crucial role in the synthesis of antibacterial proteins, bolstering the innate immune response with immune cells like macrophages, dendritic cells, and lymphocytes. Complementing this defense, leukocytes, including neutrophils and macrophages, are mobilized to produce inflammation mediators, phagocytize bacteria, and recognize antigenic structures, thereby enhancing the immune defense within the mammary gland. Humoral immunity is further fortified by the presence of key immunoglobulins, such as IgG1, IgG2, IgM, and IgA, which combat bacterial pathogens. Additionally, the complement system, comprised of various proteins, reinforces the inflammatory process, fortifying the immune response against microbial invaders. Further, different pathogens trigger distinct responses in MECs based on the activation of various pattern recognition receptors (PRRs), leading to cytokine production, antimicrobial petites expression, and modulation of host’s immune response. Chemical antibacterial agents and humoral defense components like lactoferrin, lysozyme, and antimicrobial peptides actively contribute to shielding the bovine mammary gland from infection. Understanding these intricate immune mechanisms is crucial for devising effective strategies to uphold udder health and prevent infections in bovine populations.22.11
Source:
Rana Tanmoy (ed.). Principles of Veterinary Animal Physiology. CRC Press,2026. — 290 p.. 2026
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