This course offers an in-depth exploration of macrophages, key players in the body’s immune defense. It begins with an overview of their formation from monocytes, highlighting their morphology and presence across various tissues. Specialized macrophages, including Kupffer cells in the liver, microglia in the brain, and osteoclasts in bone, will be studied to understand their unique tissue-specific functions.

A significant part of the course is dedicated to the mechanisms of phagocytosis, a crucial process by which macrophages engulf and destroy pathogens. The role of enzymes and toll-like receptors in this process is explained, as well as macrophages' interaction with neutrophils to fight infections. The secretion of cytokines such as Interferon-gamma (IFNγ), IL-8, IL-10, and TNF-α is also covered, showing how macrophages modulate inflammation and immune response.

The course dives into antigen presentation, where macrophages play a critical role in displaying antigens through MHC-II to activate other immune cells. In addition, the production of reactive oxygen species, including superoxide, is explored to understand how macrophages kill pathogens and how antioxidants prevent damage from free radicals.

Regulatory mechanisms, especially the role of transforming growth factor-beta (TGF-β) in controlling macrophage activity, will be discussed. The course will also examine the reversal of TGF-β’s downregulation when pathogens are present. Moreover, we will study the role of opsonins in enhancing phagocytosis and macrophage surface proteins that contribute to immune functioning.

Finally, the course examines the effects of chronic alcoholism on liver immunity, particularly how it impacts Kupffer cells and overall liver function. By the end of this course, students will have a solid understanding of macrophage biology and their pivotal role in maintaining immune homeostasis.