The gut immune system meets many foreign substances from food and microbes. A special antibody, immunoglobulin A (IgA), makes a mucosal barrier that traps and neutralizes pathogens and stops them from sticking to the intestine.
Researchers studied B cell responses in mice after immunization. They found two distinct pathways that produce IgA after immune stimulation. Most IgA made in the first three weeks did not come from germinal centers. Germinal center-derived IgA became detectable in weeks three through six. Surprisingly, non-germinal center IgA and germinal center IgA showed similar antigen specificity and similar numbers of mutations.
Difficult words
- antibody — a protein that recognizes and binds to germs
- immunoglobulin A — a type of antibody in mucous membranes
- mucosal — related to the lining inside the gut
- pathogen — a germ that can cause disease in peoplepathogens
- germinal center — part of lymph node where B cells changegerminal centers
- antigen specificity — how well an antibody recognizes a particular germ
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- Why is a mucosal barrier useful in the gut?
- Have you ever had an immunization? How did it make you feel?
- Why is it important to study how the immune system makes antibodies?
Related articles
Turning Water Hyacinth into Biodegradable Sanitary Pads
Researcher Pooja Singh and colleagues used invasive water hyacinth to make eco-friendly sanitary pads. Their project won an Elsevier award in Pune and aims to reduce water and plastic pollution while supporting women in local communities.
Blocking a key immune signal may prolong post-surgery pain
A study led by Geoffroy Laumet found that blocking the immune molecule TNF-α after surgery in mice made pain last longer. The authors warn this does not mean stopping all anti-inflammatory treatment and call for targeted approaches.
New oral Listeria vaccine shows promise against colorectal cancer
Researchers report a modified oral vaccine made from Listeria that primes immune cells in the gut and limits tumor growth in mice. The vaccine worked best when combined with immune checkpoint inhibitors and caused few side effects.
