Featured Research

from universities, journals, and other organizations

Narrower range of helpful bacteria in guts of C-section infants

Date:
August 7, 2013
Source:
BMJ-British Medical Journal
Summary:
The range of helpful bacteria in the guts of infants delivered by Cesarean section, during their first two years of life, is narrower than that of infants delivered vaginally, indicates a small study.

Decreased gut microbiota diversity delayed Bacteroidetes colonisation and reduced Th1 responses in infants delivered by Caesarean section.

The range of helpful bacteria in the guts of infants delivered by caesarean section, during their first two years of life, is narrower than that of infants delivered vaginally, indicates a small study published online in the journal Gut.

This has implications for the development of the immune system, say the researchers, particularly as the C-section infants had lower levels of the major group of gut bacteria associated with good gut health, Bacteroidetes phylum, as well as chemicals that help curb allergic responses.

The researchers assessed the patterns of bacterial colonisation of the guts of 24 infants, nine of whom had been born by caesarean section one week, and then again at one, three, six, 12 and 24 months after birth.

They also took blood samples at six, 12 and 24 months to test for levels of immune system chemicals known as Th1 and 2 associated chemokines. Excess Th2 chemokines have been implicated in the development of allergies, which Th1 responses can counteract, say the authors.

The results showed that babies delivered by caesarean section, and who therefore did not pass down the mother's birth canal, either lacked or acquired late one of the major groups of gut bacteria, the Bacteroidetes, compared with the babies born vaginally.

In some C-section infants acquisition of Bacteroidetes did not occur until a year after birth. The total range of bacteria among those born by C-section was also lower than that of their vaginally delivered peers.

The differences in bacterial colonisation between the two groups of infants were not down to their mums having been given antibiotics during C-section or after the procedure to prevent infection: the levels and range of bacteria sampled from both sets of mums were similar, the analysis showed.

Bacteria are important for priming the immune system to respond appropriately to triggers, and not overreact as is the case in allergies, diabetes, and inflammatory bowel disease, say the authors.

This includes the development of immune system T cells and the correct balance between their chemical messengers, Th1 and Th2.

The C-section infants had lower circulating levels of Th1 chemical messengers in their blood, indicating an imbalance between Th1 and Th2. "Failure of Th2 silencing during maturation of the immune system may underlie development of Th2-mediated allergic disease," write the authors.

They point out that previous research has indicated that Bacteroides fragilis, one of the many Bacteroidetes, strongly influences the immune system, which ultimately enhances T cell activity and the Th1-Th2 balance.

"Thus, the lower abundance of Bacteroides among the C-section infants may be a contributing factor to the observed differences in the Th1-associated chemokines," they write.


Story Source:

The above story is based on materials provided by BMJ-British Medical Journal. Note: Materials may be edited for content and length.


Journal Reference:

  1. H. E. Jakobsson, T. R. Abrahamsson, M. C. Jenmalm, K. Harris, C. Quince, C. Jernberg, B. Bjorksten, L. Engstrand, A. F. Andersson. Decreased gut microbiota diversity, delayed Bacteroidetes colonisation and reduced Th1 responses in infants delivered by Caesarean section. Gut, 2013; DOI: 10.1136/gutjnl-2012-303249

Cite This Page:

BMJ-British Medical Journal. "Narrower range of helpful bacteria in guts of C-section infants." ScienceDaily. ScienceDaily, 7 August 2013. <www.sciencedaily.com/releases/2013/08/130807204843.htm>.
BMJ-British Medical Journal. (2013, August 7). Narrower range of helpful bacteria in guts of C-section infants. ScienceDaily. Retrieved September 17, 2014 from www.sciencedaily.com/releases/2013/08/130807204843.htm
BMJ-British Medical Journal. "Narrower range of helpful bacteria in guts of C-section infants." ScienceDaily. www.sciencedaily.com/releases/2013/08/130807204843.htm (accessed September 17, 2014).

Share This



More Health & Medicine News

Wednesday, September 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Artificial Sweetener Could Promote Diabetes

Artificial Sweetener Could Promote Diabetes

Newsy (Sep. 17, 2014) Doctors once thought artificial sweeteners lacked the health risks of sugar, but a new study says they can impact blood sugar levels the same way. Video provided by Newsy
Powered by NewsLook.com
Ebola Vaccine Trial Gets Underway at Oxford University

Ebola Vaccine Trial Gets Underway at Oxford University

AFP (Sep. 17, 2014) A healthy British volunteer is to become the first person to receive a new vaccine for the Ebola virus after US President Barack Obama called for action against the epidemic and warned it was "spiralling out of control." Duration: 01:02 Video provided by AFP
Powered by NewsLook.com
Obesity Rates Steady Even As Americans' Waistlines Expand

Obesity Rates Steady Even As Americans' Waistlines Expand

Newsy (Sep. 17, 2014) Researchers are puzzled as to why obesity rates remain relatively stable as average waistlines continue to expand. Video provided by Newsy
Powered by NewsLook.com
President To Send 3,000 Military Personnel To Fight Ebola

President To Send 3,000 Military Personnel To Fight Ebola

Newsy (Sep. 16, 2014) President Obama is expected to send 3,000 troops to West Africa as part of the effort to contain Ebola's spread. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins