Immunoblast

Detailed article on Immunoblasts for medical students

Immunoblast

  File:Immunoblast micrograph.jpg

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Overview

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See also

• Cell biology
• List of cells in the human body

External links

• Link to external resource

An immunoblast is a type of lymphocyte that has been activated by an antigen and is undergoing rapid growth and division. Immunoblasts are crucial components of the adaptive immune system, playing a key role in the body's response to pathogens.

Characteristics

Immunoblasts are characterized by their large size, prominent nucleoli, and abundant cytoplasm. They are derived from either B cells or T cells that have encountered their specific antigen. Upon activation, these cells undergo a transformation into immunoblasts, which then proliferate and differentiate into effector cells.

Morphology

Under the microscope, immunoblasts appear as large cells with a high nucleus-to-cytoplasm ratio. The nucleus is often round or oval with one or more prominent nucleoli, and the cytoplasm is basophilic due to the high content of RNA.

Function

The primary function of immunoblasts is to proliferate and differentiate into effector cells. B cell-derived immunoblasts can differentiate into plasma cells, which produce antibodies, while T cell-derived immunoblasts can become effector T cells that perform various functions, such as cytotoxic activity or cytokine production.

Role in Immune Response

Immunoblasts are essential for mounting an effective immune response. Upon antigen recognition, lymphocytes become activated and transform into immunoblasts. This transformation is accompanied by changes in gene expression that prepare the cell for rapid division and differentiation.

B Cell Immunoblasts

B cell immunoblasts are responsible for the humoral immune response. After activation, they proliferate and differentiate into plasma cells, which secrete large quantities of antibodies specific to the antigen.

T Cell Immunoblasts

T cell immunoblasts are involved in the cell-mediated immune response. They can differentiate into various types of effector T cells, such as cytotoxic T cells and helper T cells, which help orchestrate the immune response by killing infected cells or helping other immune cells.

Clinical Significance

Immunoblasts can be observed in various pathological conditions, such as infectious mononucleosis, where there is a proliferation of atypical lymphocytes. They are also seen in certain types of lymphoma, where the uncontrolled growth of immunoblasts can lead to malignancy.

Also see

• Lymphocyte
• Plasma cell
• Effector T cell
• Adaptive immune system
• Antigen