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[[Image:Lymphoblast.png|thumb|Lymphoblast]]
==Lymphoblast==
__NOTOC__
A '''lymphoblast''' is a modified naive [[lymphocyte]] with altered cell morphology. It occurs when the lymphocyte is activated by an antigen (from antigen-presenting cells) and increased in volume by nucleus and cytoplasm growth as well as new mRNA and protein synthesis. The lymphoblast then starts dividing two to four times every 24-hours for 3-5 days, with a single lymphoblast making approximately 1000 clones of its original naive lymphocyte, with each sharing the originally unique antigen specificity. Finally the dividing cells differentiate into effector cells, known as Plasma Cells (for B cells), Cytotoxic T cells, and Helper T cells.<ref>Janeway's Immunobiology, 9th edition, Chapter 1, page 23</ref>


Lymphoblasts can also refer to immature cells which typically [[cellular differentiation|differentiate]] to form mature [[lymphocyte]]s.<ref>{{Cite web|title = Lymphoblasts - National Library of Medicine|url = https://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0022047/|website = PubMed Health|accessdate = 2015-11-17|first = National Center for Biotechnology|last = Information|first2 = U. S. National Library of Medicine 8600 Rockville|last2 = Pike|first3 = Bethesda|last3 = MD|first4 = 20894|last4 = Usa}}</ref> Normally lymphoblasts are found in the bone marrow, but in [[acute lymphoblastic leukemia]] (ALL), lymphoblasts proliferate uncontrollably and are found in large numbers in the peripheral blood.
A '''lymphoblast''' is a type of [[white blood cell]] that is an immature precursor to a mature [[lymphocyte]]. Lymphoblasts are primarily found in the [[bone marrow]] and are an essential part of the body's [[immune system]]. They play a crucial role in the development of the [[adaptive immune response]].


The size is between 10 and 20 μm.<ref name="Rozenberg2011">{{cite book|author=Gillian Rozenberg|title=Microscopic Haematology: A Practical Guide for the Laboratory|url=https://books.google.com/books?id=a2fWUutmB64C&pg=PA106|accessdate=29 May 2011|date=23 March 2011|publisher=Elsevier Australia|isbn=978-0-7295-4072-8|pages=106–}}</ref>
[[File:Lymphoblast.png|A diagram of a lymphoblast showing its structure|thumb|right]]


Although commonly lymphoblast refers to a precursor cell in the maturation of [[leukocyte]]s, the usage of this term is sometimes inconsistent. The Chronic Lymphocytic Leukemia Research Consortium defines a lymphoblast as "A lymphocyte that has become larger after being stimulated by an antigen. Lymphoblasts look like immature lymphocytes, and were once thought to be precursor cells.".<ref>[http://cll.ucsd.edu/glossaryl.htm CRC - Glossary L<!-- Bot generated title -->] {{webarchive|url=https://web.archive.org/web/20060211221228/http://cll.ucsd.edu/glossaryl.htm |date=2006-02-11 }}</ref> Commonly, when speaking about leukemia, "blast" is used as an abbreviation for lymphoblasts.
===Development===
Lymphoblasts originate from [[hematopoietic stem cells]] in the bone marrow. These stem cells differentiate into [[common lymphoid progenitor]] cells, which then further differentiate into lymphoblasts. Lymphoblasts can develop into either [[B cells]], [[T cells]], or [[natural killer cells]], depending on the signals they receive during their maturation process.


Lymphoblasts can be distinguished microscopically from [[myeloblast]]s by having less distinct nucleoli, more condensed chromatin, and an absence of cytoplasmic granules. However these morphologic distinctions are not absolute and a definitive diagnoses relies on antibody [[immunostaining]] for the presence of unique [[cluster of differentiation]] receptors.<ref name=Robbins>{{cite book |author1=Kumar, Vinay |author2=Abbas, Abul K. |author3=Fausto, Nelson |author4=Aster, Jon C. |title=Robbins and Cotran Pathologic Basis of Disease |publisher=Saunders |location=Philadelphia |year=2010 |pages=602 |isbn=978-1-4160-3121-5 |oclc= |doi=}} 8th edition.</ref>
During their development, lymphoblasts undergo a series of changes, including the rearrangement of their [[immunoglobulin]] or [[T-cell receptor]] genes, which is crucial for the diversity and specificity of the immune response.


==Additional images==
===Function===
<gallery>
The primary function of lymphoblasts is to proliferate and differentiate into mature lymphocytes. This process is essential for the maintenance of the immune system and for the body's ability to respond to [[antigens]]. Once they have matured, lymphocytes can circulate in the blood and lymphatic system, where they perform various immune functions.
Image:Illu blood cell lineage.jpg|Blood cell lineage
</gallery>


== See also ==
===Clinical Significance===
Lymphoblasts are of particular interest in the study of [[leukemia]], especially [[acute lymphoblastic leukemia]] (ALL). In ALL, there is an overproduction of lymphoblasts, which can crowd out normal cells in the bone marrow and lead to a variety of symptoms, including [[anemia]], [[infection]], and [[bleeding disorders]].


* [[Acute lymphoblastic leukemia]]
The identification and study of lymphoblasts are crucial for the diagnosis and treatment of ALL. Techniques such as [[flow cytometry]] and [[immunophenotyping]] are used to analyze the characteristics of lymphoblasts in patients suspected of having leukemia.


*[[List of human cell types derived from the germ layers]]
===Laboratory Identification===
In the laboratory, lymphoblasts can be identified by their large size, high nuclear-to-cytoplasmic ratio, and the presence of nucleoli within the nucleus. They can be distinguished from mature lymphocytes by these morphological characteristics.


== References ==
Staining techniques, such as [[Wright's stain]] or [[Giemsa stain]], are commonly used to visualize lymphoblasts under a microscope. These stains help highlight the cellular features that are characteristic of lymphoblasts.
{{reflist}}
 
{{Lymphocytes}}
 
[[Category:Blood cells]]
[[Category:Colony forming units]]


==Related Pages==
* [[Lymphocyte]]
* [[Hematopoiesis]]
* [[Acute lymphoblastic leukemia]]
* [[Immune system]]


{{oncology-stub}}
[[Category:Cell biology]]
[[Category:Immunology]]
[[Category:Hematology]]

Latest revision as of 20:27, 26 April 2025

Lymphoblast[edit]

A lymphoblast is a type of white blood cell that is an immature precursor to a mature lymphocyte. Lymphoblasts are primarily found in the bone marrow and are an essential part of the body's immune system. They play a crucial role in the development of the adaptive immune response.

File:Lymphoblast.png
A diagram of a lymphoblast showing its structure

Development[edit]

Lymphoblasts originate from hematopoietic stem cells in the bone marrow. These stem cells differentiate into common lymphoid progenitor cells, which then further differentiate into lymphoblasts. Lymphoblasts can develop into either B cells, T cells, or natural killer cells, depending on the signals they receive during their maturation process.

During their development, lymphoblasts undergo a series of changes, including the rearrangement of their immunoglobulin or T-cell receptor genes, which is crucial for the diversity and specificity of the immune response.

Function[edit]

The primary function of lymphoblasts is to proliferate and differentiate into mature lymphocytes. This process is essential for the maintenance of the immune system and for the body's ability to respond to antigens. Once they have matured, lymphocytes can circulate in the blood and lymphatic system, where they perform various immune functions.

Clinical Significance[edit]

Lymphoblasts are of particular interest in the study of leukemia, especially acute lymphoblastic leukemia (ALL). In ALL, there is an overproduction of lymphoblasts, which can crowd out normal cells in the bone marrow and lead to a variety of symptoms, including anemia, infection, and bleeding disorders.

The identification and study of lymphoblasts are crucial for the diagnosis and treatment of ALL. Techniques such as flow cytometry and immunophenotyping are used to analyze the characteristics of lymphoblasts in patients suspected of having leukemia.

Laboratory Identification[edit]

In the laboratory, lymphoblasts can be identified by their large size, high nuclear-to-cytoplasmic ratio, and the presence of nucleoli within the nucleus. They can be distinguished from mature lymphocytes by these morphological characteristics.

Staining techniques, such as Wright's stain or Giemsa stain, are commonly used to visualize lymphoblasts under a microscope. These stains help highlight the cellular features that are characteristic of lymphoblasts.

Related Pages[edit]

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