T helper cells (specific immune system)

Question 1

What do T helper 1 cells do ?

Answer 1

1- When Dendritic cells pick up viruses or bacteria or LPS , IL12 is produced. This turns the CD4 cell into a T-helper 1 cell (TH1). This then makes interferon Gamma and tells its B cells to produce IgG.

Question 2

What do TH2 cells do ?

Answer 2

2- When dendritic cells pick up parasites, they produce IL4. This turns T CD4 cells into T-helper 2 cells. This makes IL4, which tells the B cells to produce IgE.

Question 3

What happens when there is no infection ?

Answer 3

3- When there is nothing, the dendritic cell will continuously produce IL-10 because nothing is happening, and all the CD4 cells will be T regulatory cells. Nothing is happening but IgA is produced.