Related Experiment Video
Updated: Aug 30, 2025

Advanced Imaging of Lung Homing Human Lymphocytes in an Experimental In Vivo Model of Allergic Inflammation Based on Light-sheet Microscopy
Published on: April 16, 2019
Pla2g2a promotes innate Th2-type immunity lymphocytes to increase B1a cells
Susan A Shinton1, Joni Brill-Dashoff1, Kyoko Hayakawa2
1Fox Chase Cancer Center, 333 Cottman Ave., Philadelphia, PA, 19111, USA.
The presence of Pla2g2a is crucial for developing innate immunity in newborns, promoting the growth of B1a cells essential for survival. Its absence hinders this process, impacting immune cell development from neonatal to adult stages.
Area of Science:
- Immunology
- Developmental Biology
- Microbiology
Background:
- Neonatal innate immunity is vital for survival.
- The Lin28+/Let7- pathway influences Th2 and B1a cell generation.
- Bacterial presence affects Th17 and Th2 cell balance.
Purpose of the Study:
- To investigate the role of secreted group IIA-phospholipase A2 (sPLA2-IIA), encoded by Pla2g2a, in neonatal immune development.
- To understand how Pla2g2a influences B1a cell generation and Th2-type immunity.
- To examine the impact of Pla2g2a deficiency on immune cell populations and susceptibility to B cell leukemia.
Main Methods:
- Comparison of immune cell populations in Pla2g2a-sufficient (BALB/c) and deficient (C57BL/6) mice.
- Analysis of cytokine production (IL-5) in response to Pla2g2a status.
- Assessment of B1a cell numbers and B cell leukemia development in transgenic mouse models.
Main Results:
- Pla2g2a deficiency decreased IL-5 production from Th2-type cells (ILC2s, NKT2s).
- Loss of Pla2g2a led to increased bacterial-reactive NKT17 and MAIT cells.
- Pla2g2a deficiency reduced early-generated B1a cells and MZ B cells, impacting B cell development and leukemia incidence.
Conclusions:
- Pla2g2a is essential for controlling gut microbiota and promoting neonatal Th2-type immunity.
- Pla2g2a facilitates the increase of early-generated B1a cells from the neonatal to adult stage.
- The presence of Pla2g2a is critical for proper immune maturation and may influence B cell lymphoma development.
Related Concept Videos
B Cell Activation and Differentiation
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
T Cell Types and Functions
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Cells of the Adaptive Immune Response
Cell-mediated Immune Responses
T Cell Activation and Clonal Selection
Naive T cells that have not yet encountered an antigen express two primary CD...
Defense Against Bacterial Pathogens
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...

