Which of the following components are involved in allergic reaction?

IgE is released and circulated in the bloodstream in response to an allergy, where it attaches to an IgE-specific receptor on the surface of mast cells and basophils, which are both implicated in the acute inflammatory response.
At this point, the IgE-coated cells are sensitive to the allergen.
As a result, IgG and mast cells play a role in allergic reactions.