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Influenza A virus infection during pregnancy may cause changes in immune function of offspring

Written By : Dr. Kamal Kant Kohli Published On 2023-07-28T09:30:13+05:30  |  Updated On 28 July 2023 2:47 PM IST
Influenza A virus infection during pregnancy may cause changes in immune function of offspring
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Australia: Maternal influenza A virus (IAV) infection during pregnancy may affect the next generation by immune function in the gut, a recent study published in the American Journal of Physiology-Gastrointestinal and Liver Physiology has shown.

The influenza A virus, also known as the flu, is an infection centred in the respiratory system. Common symptoms of this type of flu include sore throat, coughing, sneezing, body aches and fever. The virus can cause serious complications in pregnancy and may sometimes be fatal. Although influenza A does not cross the placenta and does not directly infect the fetus, pregnant people who are infected with influenza A may have an increased risk of giving birth prematurely to babies with low birth weights. However, not much is known about the later-in-life health status of babies born to parents who had the flu during pregnancy.

In a new study, researchers studied a mouse model of influenza A during pregnancy. The research team looked at gut-associated lymphoid tissue (GALT) samples of offspring born to flu-infected female mice. GALT is a significant component of mucosal immunity in the digestive tract and is representative of the body’s immune system as a whole. GALT is present in the small intestine, the appendix and the cecum, a small pouch located at the beginning of the large intestine.

The research team found that the influenza A virus affected the offsprings’ gut physiology in a variety of ways:

• an increase in white blood cells in the cecum,

• an increase in expression of pro-inflammatory proteins involved in the immune response, and

• activation of CD4 T cells-a type of immune cell in the small intestine.

Flu infection did not lead to anatomical changes in the gastrointestinal system, such as body weight or intestinal length.

Previous research has suggested that flu-induced immune activation in a parent during their pregnancy is associated with “atypical neurodevelopment” in offspring, but because influenza A does not cross the placenta, the reasons for this phenomenon are still unknown.

Further study will help determine if having the flu during pregnancy might change the cecal microbiome in offspring and if so, “how such changes might affect the crosstalk within the gut-brain axis and potential contributions to gestational [influenza A]-induced neurological disorders in the offspring,” the researchers wrote.

Reference:

Stella Liong*, Mark A. Miles, Mitra Mohsenipour, Felicia Liong, Elisa L. Hill-Yardin, and Stavros Selemidis, Influenza A virus infection during pregnancy causes immunological changes in gut-associated lymphoid tissues of offspring mice, https://doi.org/10.1152/ajpgi.00062.2023.

American Journal of Physiology-Gastrointestinal and Liver PhysiologyFluPregnancyOffspringimmune functiongutinfluenzagut-associated lymphoid tissue
Source : American Journal of Physiology-Gastrointestinal and Liver Physiology
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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