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Primary Lymphoid Organs

Primary Lymphoid Organs

Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...

Lymphoid Cells and Tissues

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Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
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Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
The spleen is a vital organ in the lymphatic system, nestled in the upper left side of the abdomen. It is composed of two primary regions: the red pulp and the white pulp, each having distinct functions. The red pulp performs a significant role in blood filtration. It efficiently purges the blood of old or damaged red blood cells and...

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Related Experiment Video

Updated: Jun 16, 2026

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays

Published on: June 9, 2015

Thymic stromal lymphopoietin.

Rui He¹, Raif S Geha

¹Division of Immunology, Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.

Annals of the New York Academy of Sciences

|February 12, 2010

Summary

This summary is machine-generated.

Thymic stromal lymphopoietin (TSLP) is a key cytokine driving allergic inflammation. Upregulated TSLP in conditions like atopic dermatitis and asthma highlights its critical role in immune responses.

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Published on: May 10, 2017

Area of Science:

Immunology
Cell Biology
Allergy Research

Background:

Thymic stromal lymphopoietin (TSLP) is an epithelial cytokine found in various tissues.
TSLP signals through a receptor (TSLPR) composed of IL-7 receptor alpha and TSLPR chain.
The TSLPR chain shares similarities with the common gamma chain found on immune cells.

Purpose of the Study:

To elucidate the role of TSLP in immune cell polarization and function.
To understand TSLP's contribution to T helper 2 (Th2) mediated inflammation.
To investigate TSLP's involvement in allergic diseases.

Main Methods:

Analysis of TSLP signaling pathways.
Investigation of TSLP's effects on dendritic cell polarization.
Assessment of TSLP's impact on T-cell, B-cell, mast cell, and natural killer T cell activity.

Main Results:

TSLP drives dendritic cell polarization towards Th2 cytokine production.
TSLP promotes T-cell proliferation and Th2 cytokine release.
TSLP supports B-cell expansion, differentiation, and amplifies Th2 responses in mast cells and NK T cells.
Elevated TSLP expression observed in atopic dermatitis and asthma.

Conclusions:

TSLP plays a critical role in orchestrating Th2-mediated inflammation.
TSLP is a significant factor in the pathogenesis of allergic diseases like atopic dermatitis and asthma.