What receptor type recognizes the processed malaria antigens in infected hepatocytes?

What receptor type recognizes the processed malaria antigens in infected hepatocytes?

• A. CD8+ T lymphocytes
• B. CD4+ T lymphocytes
• C. B lymphocytes
• D. Natural killer cells

Answer: (A)

The recognition of processed malaria antigens in infected hepatocytes primarily involves CD8+ T lymphocytes. These T cells are crucial effector cells in the adaptive immune response, particularly in the context of intracellular pathogens such as malaria, which can reside and replicate within host cells. When malaria antigens are processed inside infected hepatocytes, they are presented on Major Histocompatibility Complex (MHC) class I molecules. CD8+ T lymphocytes recognize these MHC class I-peptide complexes. This recognition leads to the activation of CD8+ T cells, which can then kill the infected hepatocytes directly through mechanisms like the release of cytotoxic granules containing perforin and granzymes. In contrast to CD8+ T cells, CD4+ T lymphocytes recognize antigens presented on MHC class II molecules, which is more relevant for extracellular pathogens or for the help they provide to B cells and other immune cells rather than direct cytotoxicity against infected cells. B lymphocytes are primarily involved in antibody production and recognition of intact antigens rather than processed peptides. Natural killer cells have a role in the innate immune response by recognizing stressed or abnormal cells but do not specifically recognize processed antigen in the same way that CD8+ T cells do

The recognition of processed malaria antigens in infected hepatocytes primarily involves CD8+ T lymphocytes. These T cells are crucial effector cells in the adaptive immune response, particularly in the context of intracellular pathogens such as malaria, which can reside and replicate within host cells.

When malaria antigens are processed inside infected hepatocytes, they are presented on Major Histocompatibility Complex (MHC) class I molecules. CD8+ T lymphocytes recognize these MHC class I-peptide complexes. This recognition leads to the activation of CD8+ T cells, which can then kill the infected hepatocytes directly through mechanisms like the release of cytotoxic granules containing perforin and granzymes.

In contrast to CD8+ T cells, CD4+ T lymphocytes recognize antigens presented on MHC class II molecules, which is more relevant for extracellular pathogens or for the help they provide to B cells and other immune cells rather than direct cytotoxicity against infected cells. B lymphocytes are primarily involved in antibody production and recognition of intact antigens rather than processed peptides. Natural killer cells have a role in the innate immune response by recognizing stressed or abnormal cells but do not specifically recognize processed antigen in the same way that CD8+ T cells do