Mast Cells and Immune Response

The video tutorial covers the roles of mast cells, basophils, and eosinophils in immunity and allergic reactions. It explains the development and function of these cells, focusing on mast cells' structure, activation, and mediators. The tutorial also discusses pathological conditions like mastocytosis and monoclonal mast cell activation syndrome (MACS) caused by mast cell dysregulation.

Which of the following cell types is not classified as a granulocyte?

• Eosinophils

• Basophils

• Neutrophils

• Mast cells

Where do mast cells reach their final maturation?

• Lymph nodes

• Bone marrow

• Bloodstream

• Peripheral tissues

What is the primary role of mast cells in the immune response?

• To recognize danger signals and orchestrate early immune response

• To circulate in the bloodstream

• To produce antibodies

• To destroy pathogens directly

Which subtype of mast cells is found in the mucosa of the respiratory and gastrointestinal tracts?

• Basophils

• MCT cells

• MCTC cells

• Eosinophils

What receptor is expressed by mast cells for stem cell factor?

• CD64

• CD32a

• CD117+

• FcεR1

Which of the following is a preformed mediator released by mast cells?

• Leukotrienes

• Histamine

• TNF-α

• PGD2

What is the effect of PGD2 released by mast cells?

• Bronchodilation

• Bronchoconstriction

• Vasodilation

• Vasoconstriction

Which cytokine is critical for eosinophil development and survival?

• IL-13

• IL-10

• IL-6

• IL-3

What condition is caused by activating mutations in KIT leading to excessive mast cell activation?

• Eczema

• Anaphylaxis

• Mastocytosis

• Asthma

What is an example of monoclonal mast cell activation syndrome?

• Chronic inflammation

• Localized allergic reaction

• Autoimmune disorder

• Systemic anaphylaxis to bee stings