Among the key molecules that control cell-mediated cytotoxicity are:
a. Perforin
b. Immunoglobulins
c. Complement
d. Cytokines
ie. Interferons

Verified step by step guidance

Step 1: Understand the context of cell-mediated cytotoxicity, which is a process where immune cells directly kill infected or abnormal cells, such as virus-infected cells or tumor cells.

Step 2: Identify the molecules involved in this process. Perforin is a key molecule released by cytotoxic T cells and natural killer (NK) cells that forms pores in the target cell membrane, leading to cell death.

Step 3: Recognize that immunoglobulins (antibodies) primarily function in humoral immunity by neutralizing pathogens and are not directly involved in cell-mediated cytotoxicity.

Step 4: Complement proteins assist in pathogen destruction mainly through the complement cascade, which is part of innate immunity but not the primary mechanism in cell-mediated cytotoxicity.

Step 5: Cytokines, including interferons, are signaling molecules that modulate immune responses and can enhance the cytotoxic activity of immune cells, thus playing an important regulatory role in cell-mediated cytotoxicity.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Perforin

Perforin is a protein released by cytotoxic T cells and natural killer cells that forms pores in the membrane of target cells, leading to cell lysis. It is essential for the direct killing of infected or abnormal cells during cell-mediated cytotoxicity.

Cytokines

Cytokines are signaling molecules secreted by immune cells that regulate immune responses. In cell-mediated cytotoxicity, cytokines like interferons activate and enhance the killing ability of cytotoxic cells and coordinate the immune defense.

Interferons

Interferons are a type of cytokine produced in response to viral infections that help inhibit viral replication and activate immune cells. They play a critical role in enhancing the cytotoxic activity of immune cells during cell-mediated immunity.

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