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Antimicrobial proteins are various types of proteins that play a crucial role in protecting the body by directly attacking or inhibiting foreign invaders such as pathogens. Examples include lysozyme, the complement system, and interferons.
Interferons are proteins produced by cells in response to viral infections. They help to inhibit viral replication and can also have anti-cancer properties. They are secreted by virus-infected cells and activate immune responses, including the action of natural killer (NK) cells.
The two main types of lymphocytes are B lymphocytes (B cells) and T lymphocytes (T cells). B cells are primarily responsible for antibody production, while T cells are involved in cell-mediated immunity.
Cell-mediated immune response involves T cells that directly attack infected cells, while humoral immune response involves B cells that produce antibodies to neutralize pathogens.
Memory T cells are long-lived cells that remember past infections. They enable a faster and more effective immune response upon re-exposure to the same antigen, facilitating a quicker secondary immune response.
MHC molecules present peptide fragments of antigens on the surface of cells, allowing T cells to recognize and respond to these antigens. MHC class I molecules present to CD8+ cytotoxic T cells, while MHC class II molecules present to CD4+ helper T cells.
Vaccines stimulate the immune system to produce a specific response against a pathogen without causing disease. They promote the formation of memory cells, which provide long-lasting protection against future infections by the same pathogen.
Live attenuated vaccines contain weakened forms of the pathogen. They can pose risks for individuals with compromised immune systems, as these individuals may not be able to mount an adequate immune response, potentially leading to disease.
NK cells are a type of lymphocyte that play a critical role in the innate immune response. They can recognize and kill virus-infected cells and tumor cells without prior sensitization to the antigen.
The immune system remembers previous infections through the formation of memory cells, which are generated during the primary immune response. These cells persist in the body and enable a rapid and robust response upon re-exposure to the same pathogen.
Specific antibodies are produced by B cells in response to antigens. They bind to pathogens, neutralizing them and marking them for destruction by other immune cells, thus playing a crucial role in the humoral immune response.
Pathogens can evade the immune system through various mechanisms, including antigenic variation, hiding within host cells, producing substances that inhibit immune responses, and mimicking host molecules.
Complement proteins are part of the innate immune system and enhance the ability of antibodies and phagocytic cells to clear pathogens. They can directly lyse pathogens, promote inflammation, and facilitate opsonization.
T helper cells (CD4+ T cells) assist in the immune response by activating B cells to produce antibodies and enhancing the activity of cytotoxic T cells and macrophages, thus coordinating the overall immune response.
Antibodies neutralize pathogens by binding to their surface antigens, preventing them from entering or damaging host cells, and marking them for destruction by other immune cells.
An effective vaccine should be safe, provide long-lasting immunity, induce a strong immune response, and be able to stimulate both humoral and cell-mediated immunity.
The body differentiates between self and non-self cells through the recognition of specific markers, such as MHC molecules and other surface proteins, which are unique to each individual.
Dendritic cells are antigen-presenting cells that capture, process, and present antigens to T cells, thus playing a crucial role in initiating and regulating the adaptive immune response.
The secondary immune response is characterized by a faster and more robust reaction to a previously encountered antigen, due to the presence of memory cells, leading to quicker pathogen clearance.
Cytokines are signaling molecules that mediate and regulate immunity, inflammation, and hematopoiesis. They facilitate communication between immune cells and help coordinate the immune response.
Active immunity occurs when the immune system is exposed to an antigen and produces its own antibodies, while passive immunity involves the transfer of antibodies from another source, providing immediate but temporary protection.
Macrophages are phagocytic cells that engulf and digest pathogens and dead cells. They also play a role in antigen presentation and secrete cytokines to recruit and activate other immune cells.